Henny Penny Heated Merchandisers Model HMR-103 Model HMR-104 Model HMR-105 Model HMR-106 Model HMR-107 TECHNICAL MANUAL
Henny PennyHeated Merchandisers
Model HMR-103Model HMR-104Model HMR-105Model HMR-106Model HMR-107
TECHNICAL MANUAL
Model HMR-103,104,105,106,107
TABLE OF CONTENTSSection PageSection 1. TROUBLESHOOTING .................................................................................................... 1-1
1-1 Introduction ........................................................................................................... 1-11-2 Safety .................................................................................................................... 1-11-3. Troubleshooting ..................................................................................................... 1-11-4. Error Codes and Warnings .................................................................................... 1-4
Section 2. MAINTENANCE ............................................................................................................. 2-12-1. Introduction ........................................................................................................... 2-12-2. Maintenance Hints ................................................................................................ 2-12-3. Front Glass Replacement ...................................................................................... 2-12-4. Radiant Heater Replacement ............................................................................... 2-32-5. Light Socket Replacement .................................................................................... 2-42-6. Water Heater Replacement .................................................................................. 2-52-7. Water Probe Replacement .................................................................................... 2-72-8. Base Heater Replacement .................................................................................... 2-102-9. Blower Motor Replacement ................................................................................. 2-112-10. Air Probe Replacement ........................................................................................ 2-122-11. Transformer Replacement .................................................................................... 2-152-12. Food Probe Receptacle Replacement .................................................................. 2-162-13. Relay Replacement ............................................................................................... 2-172-14. Cooling Fan Replacement ..................................................................................... 2-182-15. Fuse and Fuse Holder Replacement ..................................................................... 2-202-16. High Limit Replacement - Automatic Reset ......................................................... 2-212-17. High Limit Replacement - Manual Reset ............................................................. 2-222-18. Power Switch Replacement ................................................................................. 2-232-19. Contactor Replacement ........................................................................................ 2-242-20. PC Board Replacement ........................................................................................ 2-252-21. Light Bulb Replacement ....................................................................................... 2-262-21. Wiring Diagrams ................................................................................................... 2-27
106 iFM06-010 Revised 11-30-2020
Model HMR-103,104,105,106,107
203 1-1
SECTION 1. TROUBLESHOOTING
1-1. INTRODUCTION This section provides troubleshooting information in the form of aneasy to read table.
If a problem occurs during the first operation of a new unit,recheck the Installation Section of the Operator’s Manual.
Before troubleshooting, always recheck the operatingprocedure per the Operation Section of the Operator’s Manual.
1-2. SAFETY Where information is of particular importance or is safety related,the words, NOTICE, CAUTION, or WARNING are used.Their usage is described below.
SAFETY ALERT SYMBOL is used with DANGER, WARNING,or CAUTION which indicates a personal injury type hazard.
NOTICE is used to highlight especially important information.
CAUTION used without the safety alert symbol indicatesa potentially hazardous situation which, if not avoided,may result in property damage.
CAUTION used with the safety alert symbol indicates apotentially hazardous situation which, if not avoided, mayresult in minor or moderate injury.
WARNING indicates a potentially hazardous situationwhich, if not avoided, could result in death or serious injury.
1-3. TROUBLESHOOTING To isolate a malfunction, proceed as follows:
1. Clearly define the problem (or symptom) and when itoccurs.
2. Locate the problem in the troubleshooting table.
3. Review all possible causes. Then, one-at-a-time workthrough the list of corrections until the problem is solved.
Model HMR-103,104,105,106,107
1-3. TROUBLESHOOTING (Continued) PROBLEM CAUSE CORRECTION
With power switch in • Open circuit • Check to see that unit isPOWER position, unit plugged inis completelyinoperative (no power) • Check breaker or fuse at
supply box
• Check control panel fuses per Fuseand Fuse Holder Replacement Section
• Check voltage at wall receptacle
• Check POWER switch; replace if defective
• Check cord and plug for loose connections
• Control board defective • Check for 12 volt input from transformer; replace if
defective
• Transformer defective • Check input and output voltage;replace if defective
Unit will not heat • Control board not calling • Check set point reading; if unit for heat below setpoint and not calling
for heat, control board defective
• Power on, board has • Hi limit tripped; check for no display defective hi limit, or defective
blower motor
No air heat • Faulty heat relay • Check and replace
• Faulty air heater • Check and replace
• Unit not preheated • Preheat unit with pans inplace before loading product
• Faulty radiant/air heat PC board • Replace PC Board
1-2 803
Model HMR-103,104,105,106,107
1-3. TROUBLESHOOTING (Continued)
PROBLEM CAUSE CORRECTION
No radiant heat • Faulty control • Replace the appropriate PC Board; PC board each well has its own control board
• Faulty radiant heater • Replace radiant heater
No water heat • Faulty radiant/water heat • Replace PC board PC board
• Faulty water heater • Replace water heater
No lights • Light switch defective • Replace light switch
• Light relay defective • Replace relay (same as heat relay)
• Light socket shorted • Replace light socket
• Light bulb blown • Replace light bulb
Canopy glass fogging • Air blowers not circulating • Replace blower motor heated air across glass
• Water heat setting too high • Lower water heat setting
• Radiant heat setting too low • Raise radiant heat setting
Product not holding • Doors are left open • Keep doors closed except totemperature load and unload product
• Heat settings too low • Adjust heat settings
• Low or improper voltage • Using meter, compare receptacle voltage to data plate voltage
• Product held too long • Hold product for recommended time
• Product not placed correctly in unit • Place product in unit as per Operationwith Product Section of Operator’sManual
803 1-3
Model HMR-103,104,105,106,107
1-4. ERROR CODES AND The display shows the following error codes and warnings when a WARNINGS fault is detected, along with an alarm sound. Both the heat and
humidity systems shut down, except when specified otherwise.
1-4 803
DISPLAY
LO
HI
“E-4”
“E-6”
“E-41”
“E-56”
CAUSE
• Food probe or actual temperatureis below 50o F (10o C) in Calibra-tion Mode only
• Food probe temperature above500o F (260o C) or lower airtemperature 275o F (135o C), orabove
• Control board temperature above140o F (60o C)
• Air probe error; displayed if theprobe resistance falls below 930ohms or rises above 2036 ohms;the exception is on the upper heatcontrol; any high resistance ap-pears as if no food probe isplugged in
• Scrambled PC board memory
• Setpoint storage error
• Allow unit to heat-up, or remove foodfrom unit
• Check the probes and heating circuit
• Check or clean cooling fans; if “E-4”persists, replace PC board
• Check probe and connection at PCboard
• Press UP button to clear “E-41”; if“E-41” persists, replace PC board
• Press UP button to clear “E-56”, thenturn unit off and back on; if “E-56”persists, replace PC board
CORRECTION
Model HMR-103,104,105,106,107
2-1. INTRODUCTION This section provides procedures for the checkout and re-placement of the various parts used within the heated mer-chandiser. Before replacing any parts, refer to the Trouble-shooting Section. It will aid you in determining the cause ofthe malfunction.
2-2. MAINTENANCE HINTS 1. You may want to use a multimeter to check the electriccomponents.
2. When the manual refers to the circuit being closed, themultimeter should read zero unless otherwise noted.
3. When the manual refers to the circuit being open, the multi-meter reads infinity.
2-3. FRONT GLASS REPLACEMENT 1. Raise the front glass to expose the gas shocks.
2. Using a 3 mm Allen wrench, loosen the set screws onthe shock bracket armature (Figure 2-1).
Figure 2-1
3. Using a Phillips head screwdriver, remove the screwssecuring the exterior end cap and remove end cap(Figure 2-2).
203 2-1
Figure 2-2
SECTION 2. MAINTENANCE
Model HMR-103,104,105,106,107
2-3. FRONT GLASSREPLACEMENT (Continued)
4. Using a Phillips head screwdriver, remove the screwssecuring the interior end cap and remove cap(Figure 2-3).
Figure 2-35. Hold glass upright, then use the gas shock tool (part no.
56878), to release the shock from the brackets (Figure2-4). Place tool on shock as shown and squeeze handle.Be sure to hold onto glass to prevent glass from breaking.
Note location and strength (N) of shock beforeremoving.
Figure 2-4
6. Slide glass assembly off end of unit (Figure 2-5).
Figure 2-5
2-2 1202
Model HMR-103,104,105,106,107
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove sliding doors.
2. Using a Phillips head screwdriver, remove 3 screwsaround the heater, leaving the top right screw.
3. Using a Phillips head screwdriver, remove the 4 screwssecuring the heater housing and allow housing to hingedown (Figure 2-7).
4. Remove fourth screw from around heater and removeouter housing (Figure 2-8).
Figure 2-6
Figure 2-8
1202 2-3
2-3. FRONT GLASSREPLACEMENT (Continued)
7. Slide new glass assembly into place, aligning outside edgeof glass clamp to the outside edge of the canopy(Figure 2-6).
8. Tighten set screws on shock bracket armatures(Figure 2-1).
9. Using the gas shock tool, reinstall the gas shocks, placingthe bottom end of shock in place first.
10. Replace interior end cap, with it being completely flush withglass clamp.
11. Replace the exterior end caps. Make sure spacers arebetween the end cap and the canopy.
2-4. RADIANT HEATERREPLACEMENT
Figure 2-7
Model HMR-103,104,105,106,107
2-4 506
2-4. RADIANT HEATERREPLACEMENT (Continued)
5. Using a 3/8” socket, remove the wires from the backof the radiant heater (Figure 2-9).
Using a multimeter, or ohmmeter, check ohm rating with-out the wires connected. The Ohm ratings:208V - Hot - 84.8 ohms; Cold - 72.7 - 88.9 ohms230V - Hot - 103.7 ohms; Cold - 88.9 - 108.7 ohms240V - Hot - 221.5 ohms; Cold - 189.9 - 232.1 ohms
6. Install new radiant heater in reverse order.
When re-attatching the heater wires to the heater thebottom nut must be held in place while the top nut istightened down on the heater wires.
Figure 2-9
2-5. LIGHT SOCKET REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Raise canopy glass and remove light bulb.
2. Using 3/8” socket, remove the 2 keps nuts securing thelight socket assembly (Figure 2-10).
3. Pull socket assembly from studs.
4. Using a Phillips head screwdriver, remove the wires fromthe socket (Figure 2-11).
Figure 2-10
Figure 2-11
Model HMR-103,104,105,106,107
1. Remove pans and pan supports from unit.
2. Using a 3/8” socket, remove the acorn nuts securing theheater cover (Figure 2-13).
3. Remove the 3 Phillips head screws securing the rear ofthe heater cover (Figure 2-14).
4. Cut the silicone seal around the rear of the cover.
Figure 2-13
Figure 2-14
203 2-5
2-5. LIGHT SOCKET REPLACEMENT(Continued)
5. Squeeze the brackets and pull socket from housing(Figure 2-12).
6. Install new socket in reverse order.
Figure 2-12
2-6. WATER HEATER REPLACEMENT
To avoid electrical shock or property damage,move the POWER switch to OFF and disconnectmain circuit breaker, or unplug cord at wallreceptacle.
Model HMR-103,104,105,106,107
2-6. WATER HEATER REPLACEMENT 5. Remove the 5 Phillips head screws securing side mount-(Continued) ing plate (Figure 2-15).
6. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-16).
7. Cut wire ties to probe wires (Figure 2-17).
Figure 2-15
Figure 2-16
Figure 2-17
2-6 1202
Model HMR-103,104,105,106,107
Figure 2-18
Figure 2-19
803 2-7
2-6. WATER HEATER REPLACEMENT(Continued)
8. Disconnect wires from heater (Figure 2-18).
Using a multimeter, or ohmmeter, check ohm rating with-out the wires connected. The ohm ratings:208V - Hot - 108.1 ohms; Cold - 97.8 - 113.3 ohms230V - Hot - 132.2 ohms; Cold - 119.6 - 138.5 ohms
9. Pull heater cover from side mounting plate.
10. Flip heater cover to expose heater.
11. Using 5/16” socket, remove keps nuts securing theheater clips, and pull heater from heater cover(Figure 2-19).
12. Replace new heater in reverse order.
2-7. WATER PROBE REPLACEMENT
To avoid electrical shock or property damage,move the POWER switch to OFF and disconnectmain circuit breaker, or unplug cord at wall recep-tacle.
Figure 2-20
1. Remove pans and pan supports from unit.
2. Using a 3/8” socket, remove the acorn nuts securingthe heater cover (Figure 2-20).
Model HMR-103,104,105,106,107
2-7. WATER PROBE REPLACEMENT 3. Remove the 3 Phillips head screws securing the rear of(Continued) the heater cover (Figure 2-21).
4. Cut the silicone seal around the rear of the cover.
5. Remove the 5 Phillips head screws securing side mount-ing plate (Figure 2-22).
6. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-23).
Figure 2-21
Figure 2-22
Figure 2-23
2-8 1202
Model HMR-103,104,105,106,107
2-7. WATER PROBE REPLACEMENT 7. Cut wire ties to probe wires (Figure 2-24).(Continued)
\
8. Unplug probe from wiring harness (Figure 2-25).
9. Using 5/16” socket, loosen keps nut on probe clip andpull probe from unit.
10. Install new probe in reverse order.
Extend probe 1-1/2” (38 mm), from clip (Figure 2-26).
Figure 2-24
Figure 2-25
Figure 2-26
1202 2-9
Model HMR-103,104,105,106,107
2-8. BASE HEATER REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove pans and pan supports from unit.
2. Remove Phillips head screws from heater bracket(Figure 2-27).
3. Using a 3/8” wrench or socket, remove the acorn nutsecuring the heater brace and remove brace.
4. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-28).
5. Pull wires from heater and pull heater from unit(Figure 2-29).
Using a multimeter, or ohm meter, check ohm ratingwithout the wires connected. The ohm ratings:208V - Hot - 66.5 ohms; Cold - 60.2 - 89.7 ohms240V - Hot - 88.6 ohms; Cold - 80.1 - 92.8 ohms
6. Install new heater in reverse order.
Figure 2-27
Figure 2-28
Figure 2-29
2-10 506
Model HMR-103,104,105,106,107
2-9. BLOWER MOTOR REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-30).
2. Remove the 3 screws from the blower bracket and pullblower motor assembly from housing (Figure 2-31).
3. Using an Allen wrench, loosen the set screw securingthe fan blade to the blower motor and pull fan blade frommotor (Figure 2-32).
4. Cut wires to blower motor and pull motor from unit.
5. Strip back the cut wires, and connect new blower motorwires to these wires, using wire splicers or wire nuts.
6. Install new blower motor in reverse order.
Figure 2-30
Figure 2-31
Figure 2-32
203 2-11
Model HMR-103,104,105,106,107
2-10. AIR PROBE REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-33).
2. Cut wires ties to probe wires (Figure 2-34).
3. Unplug the probe from the wire harness (Figure 2-35).
4. Using a multimeter, or ohmmeter, check across the probeterminals for the correct ohms using the RTD ResistanceChart on the following page. If the probe proves faulty,continue onto step 5. If probe is good, replace wire tieson wires.
Figure 2-33
Figure 2-34
Figure 2-35
2-12 203
Model HMR-103,104,105,106,107
RTD Resistance ChartTe
mp.
Tem
p.R
esi s
t anc
eF
CO
hm
s3
20 .
0010
00.0
03
30 .
5610
02.1
73
41 .
1110
04.3
43
51 .
6710
06.5
13
62 .
2210
08.6
83
72 .
7810
10.8
53
83 .
3310
13.0
23
93 .
8910
15.1
84
04 .
4410
17.3
54
15 .
0010
19.5
24
25 .
5610
21.6
94
36 .
1110
23.8
64
46 .
6710
26.0
24
57 .
2210
28.1
94
67 .
7810
30.3
64
78 .
3310
32.5
24
88 .
8910
34.6
94
99 .
4410
36.8
55
010
.00
1039
.02
51
10.5
610
41.1
85
211
.11
1043
.35
53
11.6
710
45.5
15
412
.22
1047
.67
55
12.7
810
49.8
45
613
.33
1052
.00
57
13.8
910
54.1
65
814
.44
1056
.32
59
15.0
010
58.4
96
015
.56
1060
.65
61
16.1
110
62.8
16
216
.67
1064
.97
63
17.2
210
67.1
36
417
.78
1069
.29
65
18.3
310
71.4
56
618
.89
1073
.61
67
19.4
410
75.7
76
820
.00
1077
.92
69
20.5
610
80.0
87
021
.11
1082
.24
71
21.6
710
84.4
07
222
.22
1086
.55
73
22.7
810
88.7
17
423
.33
1090
.87
75
23.8
910
93.0
2
Tem
p.Te
mp.
Re s
i st a
nce
FC
Oh
ms
76
24.4
410
95.1
87
725
.00
1097
.33
78
25.5
610
99.4
97
926
.11
1101
.64
80
26.6
711
03.8
08
127
.22
1105
.95
82
27.7
811
08.1
08
328
.33
1110
.26
84
28.8
911
12.4
18
529
.44
1114
.56
86
30.0
011
16.7
28
730
.56
1118
.87
88
31.1
111
21.0
28
931
.67
1123
.17
90
32.2
211
25.3
29
132
.78
1127
.47
92
33.3
311
29.6
29
333
.89
1131
.77
94
34.4
411
33.9
29
535
.00
1136
.07
96
35.5
611
38.2
29
736
.11
1140
.36
98
36.6
711
42.5
19
937
.22
1144
.66
100
37.7
811
46.8
110
138
.33
1148
.95
1 02
38.8
911
51.1
010
339
.44
1153
.24
104
40.0
011
55.3
910
540
.56
1157
.53
106
41.1
111
59.6
810
741
.67
1161
.82
108
42.2
211
63.9
710
942
.78
1166
.11
110
43.3
311
68.2
611
143
.89
1170
.40
112
44.4
411
72.5
411
345
.00
1174
.68
114
45.5
611
76.8
311
546
.11
1178
.97
116
46.6
711
81.1
111
747
.22
1183
.25
118
47.7
811
85.3
911
948
.33
1187
.53
Tem
p.Te
mp.
Re s
i st a
nce
FC
Oh
ms
120
48.8
911
89.6
712
149
.44
1191
.81
122
50.0
011
93.9
512
350
.56
1196
.09
124
51.1
111
98.2
312
551
.67
1200
.36
126
52.2
212
02.5
012
752
.78
1204
.64
128
53.3
312
06.7
812
953
.89
1208
.91
130
54.4
412
11.0
513
155
.00
1213
.18
132
55.5
612
15.3
213
356
.11
1217
.45
134
56.6
712
19.5
913
557
.22
1221
.72
136
57.7
812
23.8
613
758
.33
1225
.99
138
58.8
912
28.1
213
959
.44
1230
.26
140
60.0
012
32.3
914
160
.56
1234
.52
1 42
61.1
112
36.6
514
361
.67
1238
.79
144
62.2
212
40.9
214
562
.78
1243
.05
146
63.3
312
45.1
814
763
.89
1247
.31
148
64.4
412
49.4
414
965
.00
1251
.57
150
65.5
612
53.7
015
166
.11
1255
.83
152
66.6
712
57.9
515
367
.22
1260
.08
154
67.7
812
62.2
115
568
.33
1264
.34
156
68.8
912
66.4
615
769
.44
1268
.59
158
70.0
012
70.7
215
970
.56
1272
.84
160
71.1
112
74.9
716
171
.67
1277
.09
162
72.2
212
79.2
216
372
.78
1281
.34
Tem
p.Te
mp.
Re s
i st a
nce
FC
Oh
ms
164
73.3
312
83.4
716
573
.89
1285
.59
166
74.4
412
87.7
116
775
.00
1289
.84
168
75.5
612
91.9
616
976
.11
1294
.08
170
76.6
712
96.2
017
177
.22
1298
.32
172
77.7
813
00.4
517
378
.33
1302
.57
174
78.8
913
04.6
917
579
.44
1306
.81
176
80.0
013
08.9
317
780
.56
1311
.05
178
81.1
113
13.1
717
981
.67
1315
.28
180
82.2
213
17.4
018
182
.78
1319
.52
182
83.3
313
21.6
418
383
.89
1323
.76
184
84.4
413
25.8
718
585
.00
1327
.99
186
85.5
613
30.1
018
786
.11
1332
.22
188
86.6
713
34.3
418
987
.22
1336
.45
190
87.7
813
38.5
719
188
.33
1340
.68
192
88.8
913
42.7
919
389
.44
1344
.91
194
90.0
013
47.0
219
590
.56
1349
.13
196
91.1
113
51.2
519
791
.67
1353
.36
198
92.2
213
55.4
719
992
.78
1357
.58
200
93.3
313
59.6
920
193
.89
1361
.80
2 02
94.4
413
63.9
120
395
.00
1366
.02
204
95.5
613
68.1
320
596
.11
1370
.24
206
96.6
713
72.3
520
797
.22
1374
.46
Tem
p.Te
mp.
Re s
i st a
nce
FC
Oh
ms
208
97.7
813
76.5
720
998
.33
1378
.68
210
98.8
913
80.7
921
199
.44
1382
.89
212
100 .
0013
85.0
021
310
0 .56
1387
.11
2 14
101 .
1113
89.2
121
510
1 .67
1391
.32
216
102 .
2213
93.4
221
710
2 .78
1395
.53
218
103 .
3313
97.6
321
910
3 .89
1399
.74
220
104 .
4414
01.8
422
110
5 .00
1403
.95
222
105 .
5614
06.0
522
310
6 .11
1408
.15
224
106 .
6714
10.2
522
510
7 .22
1412
.36
226
107 .
7814
14.4
622
710
8 .33
1416
.56
228
108 .
8914
18.6
622
910
9 .44
1420
.76
230
110 .
0014
22.8
623
111
0 .56
1424
.96
232
111.
1114
27.0
623
311
1.67
1429
.16
234
112 .
2214
31.2
623
511
2 .78
1433
.36
236
113 .
3314
35.4
623
711
3 .89
1437
.55
238
114 .
4414
39.6
523
911
5 .00
1441
.75
240
115 .
5614
43.8
524
111
6.11
1445
.94
242
116 .
6714
48.0
424
311
7 .22
1450
.13
244
117 .
7814
52.2
324
511
8 .33
1454
.32
246
118 .
8914
56.4
224
711
9 .44
1458
.51
248
120 .
0014
60.6
124
912
0 .56
1462
.70
250
121 .
1114
64.7
9
701 2-13
Model HMR-103,104,105,106,107
2-10. AIR PROBE REPLACEMENT 5. Using a 3/4” wrench, loosen probe strain relief and pull (Continued) the probe from the unit (Figure 2-36).
6. Install new probe in reverse order, extending the probe1/8” into cabinet (Figure 2-37).
Figure 2-37
Some probes are held into place by a probe bracket in-stead of a strain relief. Press on the edge of the bracketto relax the tension on the probe and then pull probe fromunit. Extend the new probe about 1/4” into cabinet(Figure 2-38).
Figure 2-36
Figure 2-38
2-14 1202
Model HMR-103,104,105,106,107
2-11. TRANSFORMER REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the top, rearcover, and let cover hinge down (Figure 2-39).
Figure 2-39
2. Label, and then pull the wires from the transformer(Figure 2-40).
3. Remove the Phillips head screws securing the transformerand pull transformer from unit (Figure 2-41).
4. Install new transformer in reverse order.
Figure 2-40
Figure 2-41
203 2-15
Model HMR-103,104,105,106,107
2-12. FOOD PROBE RECEPTACLE REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the top, rearcover, and let cover hinge down (Figure 2-42).
2. Cut wire ties securing receptacle wires and disconnectreceptacle from wire harness.
3. Using 3/8” socket, remove nuts securing bracket andpull bracket and receptacle from unit (Figure 2-43).
4. Remove the Phillips head screw securing the receptacleto the bracket and remove receptacle from bracket(Figure 2-44).
5. Install new receptacle in reverse order.
Figure 2-42
Figure 2-43
Figure 2-44
2-16 1202
Model HMR-103,104,105,106,107
2-13. RELAY REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the top, rearcover, and let cover hinge down (Figure 2-45).
2. Label wires, and then loosen the Phillips head screwssecuring the wires to the relay and pull wires from relay(Figure 2-46).
3. Remove the Phillips head screws securing the relay tothe unit, and then pull relay from unit (Figure 2-47).
4. Install new relay in reverse order.
Figure 2-45
Figure 2-46
Figure 2-47
203 2-17
Model HMR-103,104,105,106,107
2-14. COOLING FAN REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the top, rearcover, and let cover hinge down (Figure 2-48).
For bracket mounted fan instructions, see next page.
2. Using 5/16” socket, remove nuts securing the fan(Figure 2-49).
3. Cut the cooling fan wires and remove the cooling fan fromthe unit (Figure 2-50).
4. Strip back the cut wires, and connect new blower motorwires to these wires, using wire splicers or wire nuts.
5. Install new cooling fan in reverse order, making sure theair blows into the cabinet.
Figure 2-48
Figure 2-49
Figure 2-50
2-18 203
Model HMR-103,104,105,106,107
2-14. COOLING FAN REPLACEMENT (Continued)
6. Remove Phillips head screws securing the fan bracket(Figure 2-51).
7. Remove screws and nuts securing the fan to the bracket(Figure 2-52).
8. Cut wires to cooling fan and remove the fan from the unit(Figure 2-53).
9. Strip back the cut wires, and connect new cooling fanwires to these wires, using wire splicers or wire nuts.
10. Install new cooling fan in reverse order, making sure theair blows towards the outside of the unit.
Figure 2-51
Figure 2-52
Figue 2-53
1202 2-19
Model HMR-103,104,105,106,107
2-15. FUSE AND FUSE HOLDER REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
Fuse Replacement1. Unscrew fuse holder cap counterclockwise to access fuse
(Figure 2-54).
To check fuse, use a multimeter, or continuity tester, and putleads on each end of fuse. If meter shows circuit is closed,fuse is good. Replace fuse with a 15 amp fuse (20 ampfuse-CE), if meter shows circuit is open.
Fuse Holder Replacement
1. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-55).
2. Pull wires from fuse holder terminals.
3. Using 5/16” socket remove nuts securing fuse holder andpull holder from unit (Figure 2-56).
4. Install new fuse holder in reverse order.
Figure 2-54
Figure 2-55
Figure 2-56
2-20 203
Model HMR-103,104,105,106,107
2-16. HIGH LIMIT REPLACEMENT - AUTOMATIC RESET
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the top, rearcover, and let cover hinge down (Figure 2-57).
2. Pull wires from high limit (Figure 2-58).
To check high, use a multimeter or continuity tester, and putleads on each terminal of high limit. With the unit at roomtemperature, the meter shows a closed circuit if high limit isgood. Replace high limit if meter shows circuit is open.
3. Using 1/4” socket, remove nuts securing high limit, pull itfrom the unit (Figure 2-59).
4. Replace new high limit in reverse order.
Figure 2-57
Figure 2-58
Figure 2-59
203 2-21
Model HMR-103,104,105,106,107
2-17. HIGH LIMIT REPLACEMENT - MANUAL RESET
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-60).
2. Pull wires from high limit (Figure 2-61).
To check high limit, allow unit to cool, then press the resetbutton to make sure high limit is reset. Use a multimeter, orcontinuity tester, and put leads on each terminal of high limit.If the meter shows circuit is closed, the high limit is good.Replace high limit if meter shows circuit is open.
3. Using 1/4” socket, remove nuts securing the high limit,and pull high limit from unit (Figure 2-62).
4. Install new high limit in reverse order.
Figure 2-60
Figure 2-61
Figure 2-62
2-22 203
Model HMR-103,104,105,106,107
2-18. POWER SWITCH REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1A. For switches on bottom rear cover, remove the Phillipshead screws securing the bottom rear cover and let hingedown (Figure 2-63).
1B. For switches on top rear cover, remove the Phillips headscrews securing the top rear cover and let hinge down(Figure 2-64).
2. Label wires and then pull them from the switch(Figure 2-65).
3. Press tabs together and pull switch from front of panel(Figure 2-66).
4. Install new switch in reverse order.
Figure 2-63
Figure 2-64
Figure 2-66
Figure 2-65
203 2-23
Model HMR-103,104,105,106,107
2-19. CONTACTOR REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the bottom,rear cover and let hinge down (Figure 2-67).
2. Using 3/8” socket, remove the nuts securing the contactorand pull contactor off of studs (Figure 2-68).
3. Label wires and then remove the Phillips head screwssecuring the wires (Figure 2-69).
4. Install new contactor in reverse order.
Figure 2-67
Figure 2-68
Figure 2-69
2-24 203
Model HMR-103,104,105,106,107
2-20. PC BOARD REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
1. Remove the Phillips head screws securing the top, rearcover, and let cover hinge down (Figure 2-70).
2. Remove the nuts securing the housing and pull housingfrom unit (Figure 2-71).
3. Disconnect connectors to the PC board (Figure 2-72).
4. Using 5/16” socket, remove the nuts securing the PCboard and pull the board from the unit (Figure 2-73).
5. Install new PC board in reverse order.
Figure 2-70
Figure 2-71
Figure 2-72
Figure 2-73203 2-25
Model HMR-103,104,105,106,107
2-21. LIGHT BULB REPLACEMENT
To avoid electrical shock or property damage, movethe POWER switch to OFF and disconnect maincircuit breaker, or unplug cord at wall receptacle.
Light bulbs and glass may be hot. Severe burns couldresult.
1. Raise the glass canopy and ensure that the gas shockssupport its weight before proceeding.
Do Not attempt to access the bulb from the operator’sside of the unit. The installer cannot easily see the bulband socket or the adjacent radiant heaters, increasing thepotential shock or burn hazard.
2. Carefully remove the old bulb and discard. Figure 2-74.
3. Visually inspect socket to ensure there is no debris or damagethat may impede bulb installation. Figure 2-75.
4. Install the replacement bulb. Tighten using a gentle pressure.
To help prevent a short bulb life:
• Do not over-tighten the bulb. Over-tightening willdamage the contact end of the bulb and compress thecontact tab in the socket
• Do not install the bulb with the power on. During normaloperation, the socket is exposed to various food relatedagents, such as moisture and grease. When installing anew bulb with the power on, the spark that occurs whenthe bulb contact touches the socket, places a deposit onthe bottom of the bulb. This deposit results in a higheramp draw and shorter bulb life.
Figure 2-74
Figure 2-75
2-26 1104
Model HMR-103,104,105,106,107
603 2-27
2-21. WIRING DIAGRAMS
Model HMR-103,104,105,106,107
2-28 701
2-21. WIRING DIAGRAMS (Continued)
Model HMR-103,104,105,106,107
701 2-29
2-21. WIRING DIAGRAMS (Continued)
Model HMR-103,104,105,106,107
2-30 506
Model HMR-103,104,105,106,107
1104 2-31
Model HMR-103,104,105,106,107
2-32 1104