Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 21)

21
Installation
70 65 75 80
85
90
60
55
(OPTIONAL)
BLOWER
DIRTY FILTERS
MAIN VALVES
ALARM
EXHAUST
SUPPLY
HEAT
(OPTIONAL)
GREENHECK
®
PHOTOHELIC
Step 9 Check Recirculation / VAV Operation (Optional)
Two Position Damper Control
Confirm that the return damper adjusts to each position of the recirculating switch. The damper actuator may
take a few minutes to open or close.
Two Speed
Confirm that the fan speed adjusts to each position of the fan speed switch.
Potentiometer Control
To test potentiometer operation, turn the potentiometer to the two extremes. With recirculation, confirm that the
return air damper fully opens and fully closes. The damper actuator may take a few minutes to open or close.
With variable volume, make sure the fan goes to maximum and minimum speed.
Building Pressure Control
See page 31 for building pressure set-up and operation check.
Step 8 Install Discharge Air Sensor (Optional)
For units with 8:1, 16:1 or 24:1 staged turndown, install the discharge air sensor at least three duct diameters
downstream of the heat exchanger. The discharge air sensor can be found in the unit’s control center.
Step 10 Install DDC Interface (Optional)
Some units may use an external signal from a building management system to control the dampers and/or
discharge air temperature. Reference the unit ladder diagram for the correct wiring.
Installation - Electrical Wiring
NOTE!
For maintenance issues associated with variable frequency drives, consult the drive’s manual supplied
with the unit. The drives are programmed at the factory and should not need any adjustment during
installation or start-up. For kitchen applications, the drive may be located in the kitchen or in the unit.
70 65 75
80
85
90
60
55
(OPTIONAL)
BLOWER
DIRTY FILTERS
MAIN VALVES
ALARM
EXHAUST
SUPPLY
HEAT
(OPTIONAL)
GREENHECK
®
70 65 75 80
85
90
60
55
GREENHECK
®
(OPTIONAL)
BLOWER
DIRTY FILTERS
MAIN VALVES
ALARM
RECIRCULATION
EXHAUST
SUPPLY
HEAT
(OPTIONAL)
2-Position Damper Control Potentiometer Control Photohelic Control
NOTE!
Blower start-up (S-1), steps 1-4 should be performed before the blower is run.