Excellence Without Compromise TEC H N I C A L B U L L ...Polyfuse. This means no more running to the electronics store to buy a fuse, after the spare fuse that was provided has blown.

CONTROLS INC.

Excellence Without Compromise

WARNING: THESE PANELS ARE DESIGNEDFOR USE WITH 24 VOLTS. DO NOT USEANY OTHER VOLTAGE! USE CAUTION TOAVOID ELECTRIC SHOCK OR EQUIPMENT

SPECIFICATIONS

Power Requirements: 24V 60Hz 40VA

Wiring Connections: Screw Terminal blocksfor Thermostat gauge wire connections.

Mounting: Mounts with 4 screws andmollies (included).

Panel Dimensions: Length: 10” (254mm);Width: 9 7/8" (251mm); Depth: 1 9/16” (40mm).

TABLE OF CONTENTS

PAGE

1

2

5

6

7

8

Introduction & Specifications

Application Notes

Typical 5 zone control panel diagram

Thermostat Requirements (See Notes)

Checkout Procedures

EWC-ST-3E Wiring Diagram

EWC-ST-2E

Models EWC-ST-2E & EWC-ST-3E

T E C H N I C A L B U L L E T I N

Model EWC-ST-2EZONE2T’STAT

ZONE1T’STAT

CWYR

CWYR

R1OBG

ORC+_

ADDITIONALZONE PANEL

CAUTIONPLEASE read allinstructions carefullybefore starting the installation procedures.

J1

SYSTEM

24VACT’FORMER

2

1

ZONE2MOTOR

ZONE1MOTOR

M6M4M2M1

M6M4M2M1

SW1

SW2

OPEN

CLOSE

OPEN

CLOSE

EWC CONTROLS INC.Englishtown, NJ

ULTRA-ZONECONTROL SYSTEM

YWGR

BOX

CB1

Congratulations on purchasing the ST2E/ST3E seriesULTRA-ZONE Control Panel. The ST series of zone controlpanels are still the same popular, field proven zone controlpanels that have been in use for the last seventeen years! The new “E” series revision has a few upgrades to enhance the re l iabi l i ty, protect ion and operat ion of the board.

First and most important is the replacement of the old 3 amp slo-blo fuse, with an integrated Thermal Circuit breaker or Polyfuse. This means no more running to the electronics storeto buy a fuse, after the spare fuse that was provided has blown. The Polyfuse protects the panel against shorts in the thermostat or damper field wiring. It does not protect against shorts in the H V A C e q u i p m e n t f i e l d w i r i n g . S e e p a g e 2 .

The location of the J1 jumper on the panel has also changed, and there is now an arrow pointing to it. The J1 jumper enables fan operation in Heat mode as well as Cooling mode.

With the exception of the Polyfuse and the J1 jumper, allother changes have no direct bearing on the wiring,i n s ta l l a t i o n , o r o p e r a t i o n o f t h e c o n t r o l pa n e l .

The ST series zone control panels are the most versatileand rugged relay based logic control systems in use today. The Master/Slave circuitry of these panels can be utilized to satisfy numerous control applications and job specifications.

The heating/cooling changeover operation is still controlled by a changeover subbase on the zone 1 thermostat, or a separateremote selector switch can be used instead. This allowsfor inexpensive standard 2 or 3 wire thermostats to be used in allz o n e s d e p e n d i n g o n t h e f i e l d a p p l i c a t i o n .

The table on Page 6 shows the types of digital programmable thermostats that are compatible with the ST2E or ST3E panels.

The diagrams included with this bulletin are based upon the most frequently asked questions regarding the wiring of thesepanels. There are additional diagrams available through theTe c h n i c a l S u p p o r t H o t l i n e @ 1 - 8 0 0 - 5 2 6 - 4 0 4 8 .Contact the Hotline if you find yourself on the job site andunsure of the exact wiring for your ST Series Control Panel.

DAMAGE

(DISPONIBLE EN ESPAÑOL EN EWCCONTROLS.COM)

ewccontrols.com/acrobat/090375a0248.pdf

TB-115P/N 090375A0115 REV. N 11.5.20

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected] 1

Copyright © 2009 EWC Controls All Rights Reserved

rol Panel

CONTROL SYSTEM

K6

K7

R6

R7

C7 +

C6 +

D11

D12

D10

D6

D4

D9

D5

D3

D21

D22

D20

D19

D24

D23

D25

D26

C

W

Y

R

ZONE 2T'STAT

C

W

Y

R

R1

0

B

G

ZONE 1T'STAT

CAUTION

0

R

C

+

-


#1: WIRING DIAGRAMHEATING ONLY INSTALLATION

rol PanelK6

K7

R6

R7

C7 +

C6 +

D11

D12

D10

D6

D4

D9

D5

D3

D21

D22

D20

D19

D24

D23

D25

D26

C

W

Y

R

ZONE 2T'STAT

C

W

Y

R

R1

0

B

G

ZONE 1T'STAT

CAUTION

0

R

C

+

-


#2: WIRING DIAGRAMCOOLING ONLY INSTALLATION

APPL ICA TIO N NOTES

OPERATION

To operate the system in the heat mode,the "B" terminal has to be made to the "R1"terminal on the zone 1 terminal block. Thisallows any zone thermostat to call for heat.When a zone calls for heat, the controlpanel closes the circuit from "R" to "W"activating the furnace. The zone dampercalling for heat remains open and zonessatisfied will close. The fan and limit controlin the furnace will operate the fan.

1. HEAT MODE:

2. COOL MODE:To operate the system in the cool mode,the "O" terminal has to be made to the "R1"terminal on the zone 1 terminal block. Thisallows for any thermostat to call for cooling.On call for cooling, terminals "R", "G" and"Y" are made to bring on the fan andcompressor. The dampers for zones callingwill remain open; the dampers satisfied willclose.

3. OFF POSITION:When the subbase on zone 1 is in the"OFF" position the entire system is disabled.

4. CONTINUOUS FAN:When placing the fan switch on thesubbase from "AUTO" to "ON" position, thepanel closes the circuit between "R" and "G"terminals to energize the fan relay.

5. OPEN-CLOSE SWITCHES:If left in the open position when all zonessatisfy, the damper will drive to openposition. If left in closed position, when allzones satisfy , the damper will remainclosed unless it is the last zone to satisfy;then it will remain open.

NOTE: The last zone to satisfy will alwaysbe open regardless of position of switch.

WIRING

1. HVAC SYSTEM:Wiring the HVAC system to the EWC-ST-2Eor EWC-ST-3E is typical of wiring a subbaseto a heating/cooling system. (4 wiresrequired.)

The following terminals are on the systemterminal block:R-

Y-

W-

G-

Wire to the RH heating transformerand/or the RC cooling transformer.

Wire to the Compressor Relay.

Wire to Heat Control (gas valve, oilburner relay) on system terminal block.

Wire to Fan Relay.

2. TRANSFORMER 24V 40VA:A separate 24V 40VA transformer is requiredto be wired to terminals 1 and 2 of theterminal block labeled "T-Former". (2 wiresrequired.) This transformer powers the panelboard, thermostats and damper motors. Itdoes not power the furnace or the airconditioner. The board is now protected by a Thermal Polyfuse at the transformer input.When the polyfuse trips it will get quite hot. To reset the breaker, remove the 24 VAC for approximately 30 seconds. Check the damper motors and field wiring for shorts. If adding two panels together, be sure of wiring in (+ and - ) circuit.

3. ZONE DAMPER MOTORS:Use 3 conductor wire from each set of MANor RDN zone damper terminals or 2conductor wire on "SR" dampers to thepanel. See diagrams #4 and 5 when wiringmore than one damper per zone.

ZONE 1: Thermostats that have subbaseswith "B" and "O" terminals are required toenable system changeover. These includemechanical and battery operatedthermostats (6 wires required - terminals W,Y, G, R, B and O), and electro-mechanicaland programmable digital thermostats (24VAC, 7 wires required - terminals C, W, Y,G, R, B and O).

If model MCS-DXB remote selector switch isused, it will be wired to the zone 1 terminalblock in place of the changeover subbase(7 wires required total: 4 on the MCS-DXB -B, G, O and R1; 3 on the thermostat - W,Y and R). See diagram #3.

OTHER ZONES: 3 wires are required formechanical and battery operatedthermostats - terminals W, Y and R. 4 wiresare required for electro-mechanical and 24VAC digital thermostats - terminals C, W, Yand R. No subbases required.

See page 6 for specific types ofthermostats required.

4. THERMOSTATS:

5. HEAT ONLY OR COOL ONLY

Zone 1 no longer requires a subbase orremote switch. All zones need only a twoor three wire thermostat to operate in eitherheat or cool.

APPLICATIONS:

2

CONTROL SYSTEM

EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362

R GYW O B

ZONE 2 THERMOSTAT

R GYW O B

ZONE 1 THERMOSTAT

FIELDINSTALLED

JUMPER

R GYW O B

ZONE 2 THERMOSTAT

R GYW O B

ZONE 1 THERMOSTAT

FIELDINSTALLED

JUMPER

PanelK6

K7

C

W

Y

R

ZONE 2T'STAT

C

W

Y

R

R1

0

B

G

ZONE 1T'STAT

CAUTION

0

R

C

+

-

PLEASE read allinstructions carefullybefore starting the

installation procedures.


CONTROL SYSTEM

GR

EE

N

BRO

WN

RED

ORANGE

RED HEAT

OFF

COOL

FAN

ON AUTO

Front of Plate Back of Plate

#4: TYPICAL TANDEMDAMPER WIRING

3

#3: EWC-ST-2E WITH MCS-DXBREMOTE SELECTOR SWITCH

#5: CONTROL OF UP TO FOUR DAMPERS PER ZONEUSING EXTERNAL RELAY

K9

K8

X

R

G

W

Y

B

O

1

2

K4

SW1

24VT'FORMER

K2

K1

K5

OPEN

CLOSE

OPEN

CLOSE

SW2

M1

M2

M4

M6

ZONE2

M1

M2

M4

M6

ZONE1

MOTOR

MOTOR

Model

CONTROLSEnglishtown

MA-ND4 TYPE MOTORS ONND OR URD TYPE DAMPERS


CB1

RED

RED

BROWN

ORANGE

GREEN

1

6

4

1

6

4

1

6

4

1

6

4

24VAC TRANSFORMER

40 - 60VA RATINGMAX. NUMBER OF 4 DAMPERS

PER ZONE.

Multiple Damper Wiring on a Single Zone, using a Separate Transformer and an Isolating Relay. Maximum of 4 dampers per 40 va transformer.

M1

M2

M4

M6

ZONE MOTOR4

61

46

14

61

2

1

3

COIL24 vac

NC

NO

C

R1 Isolation Relay SPDT action with 24 vac coilRelay is shown de-energized. All dampers are closed.

To Line VoltageProvide over current protection

46

1

Separate 24 vac Transformer

TYPICAL FEEDER CONDUCTOR

TYPICAL JUNCTION POINT

L1

L2

H

C

One relay coil=One motor.Don’t overload your powertransformer, by connectingtoo many relays.

R GYW O B

ZONE 2 THERMOSTAT

R GYW O B

ZONE 1 THERMOSTAT

#6: TYPICAL FAN CENTER AND OILBURNER WITH ISOLATION RELAY #7: TYPICAL GAS FURNACE

#8: FAN CONTROLWITH HOT WATER COIL

#9: ZONING IN HEATING ONLYNO ZONE CONTROLLED COOLING

4

LAY

RELAY

T

T

rol Panel

CONTROL SYSTEM

K6

K7

R6

R7

C7 +

C6 +

D11

D12

D10

D6

D4

D9

D5

D3

D21

D22

D20

D19

D24

D23

D25

D26

C

W

Y

R

ZONE 2T'STAT

C

W

Y

R

R1

0

B

G

ZONE 1T'STAT

CAUTION

0

R

C

+

-


installation procedures.


K9

K8

X

R

G

W

Y

B

O

1

2

K4

SW1

24VT'FORMER

K2

K1

K5

OPEN

CLOSE

OPEN

CLOSE

SW2

M1

M2

M4

M6

ZONE2

M1

M2

M4

M6

ZONE1

MOTOR

MOTOR

Model

CONTROLSEnglishtown

K9

K8

X

R

G

W

Y

B

O

1

2

K4

SW1

24VT'FORMER

K2

K1

K5

OPEN

CLOSE

OPEN

CLOSE

SW2

M1

M2

M4

M6

ZONE2

M1

M2

M4

M6

ZONE1

MOTOR

MOTOR

Model

CONTROLSEnglishtown

K9

K8

X

R

G

W

Y

B

O

1

2

K4

SW1

24VT'FORMER

K2

K1

K5

OPEN

CLOSE

OPEN

CLOSE

SW2

M1

M2

M4

M6

ZONE2

M1

M2

M4

M6

ZONE1

MOTOR

MOTOR

Model

CONTROLSEnglishtown


CB1 CB1

CB1

ISOLATION RE

HEATING

Y

C

Y

C

W

C

Y

R

G

Y

C

C

Y

R

G

RELAY

T

T

ISOLATIONRELAY

HEATING

Y

C

Y

C

C

Y

R

G

JUMPERS

CUT

**CUT ‘J1’ JUMPER**

FANCENTER

OUTDOORCONDENSING

UNIT

GAS FURNACE

OUTDOORCONDENSING

UNIT

OUTDOORCONDENSING

UNIT

AIRHANDLER

R GYW O B

ZONE 2 THERMOSTAT

R GYW O B

ZONE 1 THERMOSTAT

FIELDINSTALLED

JUMPER

5

#10: WIRING DIAGRAMINTERCONNECTION OF TWO PANELS FOR ADDITIONAL ZONES

MASTER PANEL

SLAVE PANEL

PANELS MAY BE DAMAGED IF NOTWIRED EXACTLY

AS SHOWN

0 to 0R to RC to C+ to +- to -

K9

K8

C9

C8

Z9

Z8

D19

D20

D21

D22

D26

D25

D24

D23

Z7

C6

C7

D17

D18

D12

D11

D10

D9

D3

D4

D5

D6

D13

D14

D15

D16

Z6

K3

K5

K4

K2

K1

K6

K7

C3

C2

C1

C5

C4

Z5

Z4

Z2

Z1

Z3

D8

D7

D1

D2

SW2

SW1

Y

W

R

C

ZONE-3

C

C

R

R

W

W

Y

Y

ZONE-2

ZONE-1

OPEN

OPEN

CLOSE

CLOSE

OPEN

CLOSE

M1

M2

M4

M6

ZONE3

M1

M1

M2

M2

M4

M4

M6

M6

ZONE2

ZONE1

T'STAT

T'STAT

T'STAT

MOTOR

MOTOR

MOTOR

-+

R

O

C

G

B

O

R1

X

R

G

W

Y

B

O

1

2

24VT'FORMER

Model EWC-ST-3E

CONTROL SYSTEM

CONTROLS INC.Englishtown, NJ

CAUTIONPLEASE read all

instructionscarefully before

starting theinstallation

procedures.



CB1

K9

K8

C9

C8

Z9

Z8

D19

D20

D21

D22

D26

D25

D24

D23

Z7

C6

C7

D12

D11

D10

D9

D3

D4

D5

D6

Z6K5

K4

K2

K1

K6

K7

C2

C1

C5

C4

Z5

Z4

Z2

Z1

D8

D7

D1

D2

SW2

SW1

C

C

R

R

W

W

Y

Y

ZONE-2

ZONE-1

OPEN

OPEN

CLOSE

CLOSE

M1

M1

M2

M2

M4

M4

M6

M6

ZONE2

ZONE1

T'STAT

T'STAT

MOTOR

MOTOR

-+

R

O

C

G

B

O

R1

X

R

G

W

Y

B

O

1

2

24VT'FORMER

CONTROL SYSTEM


CAUTIONPLEASE read all

instructionscarefully before

starting theinstallation

procedures.


CB1

Model EWC-ST-2E

1

6

4

1

6

4

1

6

4

1

6

4

1

6

4

DAMPER MOTORS

DAMPER MOTORS

TRANSFORMER

C

Y

G

Y

W

C

R

HVACEQUIPMENT

R GYW O B

ZONE 3 THERMOSTAT

R GYW O B

ZONE 2 THERMOSTAT

R GYW O B

ZONE 1 THERMOSTAT

R GYW O B

ZONE 5 THERMOSTAT

R GYW O B

ZONE 4 THERMOSTAT

PANELS MAY BEDAMAGED IF NOTWIRED EXACTLY

AS SHOWN

6

THERMOSTAT REQUIREMENTS

K6

K7

R6

R7

C7 +

C6 +

D11

D12

D10

D6

D4

D9

D5

D3

D21

D22

D20

D19

C

W

Y

R

ZONE 2T'STAT

C

W

Y

R

R1

0

B

G

ZONE 1T'STAT

CAUTION


ZONE 1

C R BYW/E

ZONE 1 THERMOSTAT – MODEL EWT-725

GW2 O

C RC BYW

ZONE 2 THERMOSTAT – MODEL EWT-601-2

GRH O

If the application is heat only, cool only or using the MCS-DXBremote system selector switch, all thermostats must be set to the same mode of operation at all times.

Zone 2 and Zone 3 thermostats must be in the same mode(Heat or Cool) as the Zone 1 thermostat.

3

The Zone 1 (Master) thermostat must be set to heat or cool mode,in order for Zone 2 or Zone 3 to function! If Zone 1 is turned “OFF”Zone 2 and Zone 3 cannot function.

6 WIRES REQUIRED

MANUFACTURER

DIGITAL NON-PROGRAMMABLE

THERMOSTATS(Battery Operated)

DIGITALPROGRAMMABLE


EWT-725

Not AvailableNot Available

EWCCONTROLS

EMERSON

HONEYWELL Not Available Not Available

EWT-601-2

ZONES 2 & HIGHER3 WIRES REQUIRED

DIGITAL NON-PROGRAMMABLE


DIGITALPROGRAMMABLE


EWT-725EWC

CONTROLS

EMERSON

HONEYWELL Not Available Not Available

EWT-601-2

MANUFACTURER

WiFiThermostats(Hardwired)

Not Available

Not Available

Not Available

NOTES

Not Available Not Available4

Manufacturers have been phasing out thermostat designs with separate O & B terminals for many years now. Thermostats that arecompatible with the ST series controller are increasingly difficult to find. As a result, the ST series zone control will soon phase out as well. We suggest upgrading to our model NCM300 zone control,which is compatible with 99% of the thermostats available in today’s market. Including popular WiFi thermostats.

7

#12: SYSTEM CIRCUIT

#11: THERMOSTAT CIRCUIT

CH ECK OUT PROCEDUR E

#13: DAMPER CIRCUIT

K6

K7

R6

R7

C7 +

C6 +

D11

D12

D10

D6

D4

D9

D5

D3

D21

D22

D20

D19

D24

D23

D25

D26

C

W

Y

R

ZONE 2T'STAT

C

W

Y

R

R1

0

B

G

ZONE 1T'STAT

CAUTION

0

R

C

+

-


installationprocedures.


D15

D16

D18

D17

C

W

Y

R

ZONE 3T'STAT

HEATING MODE OFF MODE COOLING MODE

STAT

DAMPER

CALLING

OPEN

NOT CALLING

CLOSED

24 VOLTS

24 VOLTS

COMMON COMMON

O VOLTS

O VOLTS

O VOLTS

O VOLTS

O VOLTS

24 VOLTS

24 VOLTS

24 VOLTS

24 VOLTS

24 VOLTS

INPUT TO PANEL:COMMON

24 VOLTS

NOTE: Conditions shown are with atleast one thermostat always calling.When all thermostats satisfy, damperposition will depend on position of"OPEN-CLOSED" switch. In "OPEN"position, damper will drive to openposition. In "CLOSED" position, allvoltage is removed from damper motor;motor will remain in whatever position itwas in when all thermostats satisfied.

If 24 volts is present from M1 to M4 andM1 to M6, damper motor may either beturning or stuck between open andclosed postions.


K9

K8

K3

K5

K4

K2

K1

SW2

SW1

OPEN

OPEN

CLOSE

CLOSE

OPEN

CLOSE

M1

M2

M4

M6

ZONE3

M1

M1

M2

M2

M4

M4

M6

M6

ZONE2

ZONE1

MOTOR

MOTOR

MOTOR

X

R

G

W

Y

B

O

1

2

24VT'FORMER

EWC-ST-3E

CONTROLSEnglishtown

K9

K8

K3

K5

K4

K2

K1

SW2

SW1

OPEN

OPEN

CLOSE

CLOSE

OPEN

CLOSE

M1

M2

M4

M6

ZONE3

M1

M1

M2

M2

M4

M4

M6

M6

ZONE2

ZONE1

MOTOR

MOTOR

MOTOR

X

R

G

W

Y

B

O

1

2

24VT'FORMER

EWC-ST-3E

CONTROLSEnglishtown

O VOLTS 24 VOLTS

COMMON COMMON

24 VOLTS 24 VOLTS

COMMON COMMON24 VOLTS 24 VOLTS

CB1 CB1

8

#14: WIRING DIAGRAMMODEL EWC-ST-3E CONTROL PANEL

CONTROLS INC.

Excellence Without Compromise

Technical . . . . . . . 800-446-3110Sales . . . . . . . . 800-446-3110Fax . . . . . . . . .


K9

K8

C9

C8

Z9

Z8

D19

D20

D21

D22

D26

D25

D24

D23

Z7

C6

C7

D17

D18

D12

D11

D10

D9

D3

D4

D5

D6

D13

D14

D15

D16

Z6

K3

K5

K4

K2

K1

K6

K7

C3

C2

C1

C5

C4

Z5

Z4

Z2

Z1

Z3

D8

D7

D1

D2

SW2

SW1

Y

W

R

C

ZONE-3

C

C

R

R

W

W

Y

Y

ZONE-2

ZONE-1

OPEN

OPEN

CLOSE

CLOSE

OPEN

CLOSE

M1

M2

M4

M6

ZONE3

M1

M1

M2

M2

M4

M4

M6

M6

ZONE2

ZONE1

T'STAT

T'STAT

T'STAT

MOTOR

MOTOR

MOTOR

-+

R

O

C

G

B

O

R1

X

R

G

W

Y

B

O

1

2

24VT'FORMER

Model EWC-ST-3E

CONTROL SYSTEM


CAUTION


CB1

732-446-5362

1

6

4

DAMPER MOTORS

1

6

4

1

6

4

24VACTRANSFORMER

C

Y

HVACEQUIPMENT

G

Y

W

C

R

C RC BYW


GRH O

C RC BYW


GRH O

C R BYW/E

ZONE 1 THERMOSTAT – MODEL EWT-725

GW2 O

Excellence Without Compromise TEC H N I C A L B U L L ...Polyfuse. This means no more running to the electronics store to buy a fuse, after the spare fuse that was provided has blown.

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