1525 75 4 1245 344 73 188 59 3 10 7 9 8 660 219 1730 5 2 1 6 Astra G-120E 1. Supply water pipe G1 ½” 2. Cooling coil terminal nipples G ½” 3. Return water pipe G1 ½” 4. Water drain nipple G ½” 5. Flue pipe 6. Ventilator 7. Controller 8. Primary air regulation shutter 9. Secondary air regulation shutter 10. Ventilator