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Reference, Control center layout – Greenheck DG / DGX with Direct Spark (470652) User Manual

Page 37

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Direct Spark Ignition Make-Up Air

37

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Control Center Layout

Reference

13

22

26

28

27

20

15

21

4

1

7 8

2

9

3

5

16

23

17

18

19

14

25

10

12

11

6

24

1. Supply Motor Starter — 24 volt magnetic contacts

for starting supply motor.

2. Supply Overload — provides electronic overload

protection to supply motor.

3. Low Voltage Transformer — provides low voltage to

fan/heat/cooling enable controls.

4. Control Terminal Block — provides wiring access to

controls.

5. Fan Relay — allows power to pass to energize

motor starter.

6. High Voltage Enclosure — provides protection from

high voltage circuits.

7. Auxiliary Contact (optional) — provides one

normally closed and one normally open contact for
other equipment.

8. Exhaust Motor Starter (optional) — 24 volt

magnetic contacts for starting exhaust motor.

9. Exhaust Overload (optional) — provides electronic

overload protection to exhaust motor.

10. Transformer Fuse (optional) — provides proper

fusing for cooling transformer.

11. Terminal Block — provides wiring access to high

voltage circuits.

12. Exhaust Fuses (optional) — provides proper fusing

for exhaust fan motor(s).

13. Dirty Filter Switch (optional) — monitors filter

pressure drop, turns on indicating light when
pressure drop is above field-adjustable set point.

14. Inlet Air Sensor (optional) — outdoor air stat that

automatically controls the heating and/or cooling
based on outdoor air temperature.

15. Remote Temperature Selector (optional) — allows

for remote temperature set point.

16. Heat Relay — allows power to pass to heating

controls.

17. Heating Terminal Block — provides wiring access

to heating controls.

18. Flame Safeguard/Spark Generator — monitors

flame, shuts down unit when unsafe conditions are
detected.

19. High Limit — prevents unit from discharging air

above a set point.

20. Low Voltage Transformer — reduces voltage to

Maxitrol system.

21. Amplifier — controls modulating valve, assures the

desired temperature is delivered.

22. Transformer (optional) — provides voltage to

optional evaporative cooling pump.

23. Cooling Relay (optional) — allows power to pass to

cooling controls.

24. Cooling Terminal Block (optional) — provides wiring

access to cooling controls.

25. Low Voltage Transformer (optional) — reduces

voltage to cooling controls.

26. Reset Timer (optional) — resets cooling system to

run a time interval.

27. Auto Drain Relay (optional) — assures supply pump

does not operate during drain interval. Allows pump
to operate in cooling mode.

28. Cooling Timer (optional) — allows for automatic

draining of the evaporative cooling system based
on time schedule.