Greenheck DGX Installation, Operation And Maintenance Manual page 9

Step 5 Wire the Accessories
Reference the ladder diagram on the inside of the
control center door for correct wiring of the following
accessories:
• Selectrastat
• Room Override
• Blower Switch
• Heat Switch
Step 6 Wire the Optional Evaporative
Cooler
Reference the ladder diagram on the inside of the
control center door for correct wiring of the pump and
the optional auto-drain and flush.
Step 7 Check Recirculation / VAV
Operation
NOTE!
Blower start-up (S-1), steps 1-4 should be
performed before the blower is run.
Two Position Damper Control
Turn the recirculating switch on the remote control
panel to each position and confirm that the return air
damper adjusts accordingly. The damper actuator
may take a few minutes to open or close.
Two Speed
Turn the fan speed switch on the remote control
panel to each positions and confirm that the fan
speed adjusts accordingly.
Potentiometer Control
To test potentiometer operation, turn the
potentiometer to the two extremes. With 80/20
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 I-16 for building pressure set-up and operation
check.
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 and start-up.
For kitchen applications, the drive may be
located in the kitchen or in the unit.
Installation - Electrical Wiring
• Indicating Lights
• Dirty Filter Indicator
• TSCP
• KSCP
Wiring to the Maxitrol 14 or 44 should be in
separate conduit or run with shielded cable.
TSCP has number-to-number wiring.
Large evaporative coolers may require a
separate power supply.
Figure 19. 2-Position Damper Control
Figure 20. Potentiometer Control
Figure 21. Building Pressure Control
9
NOTE!
NOTE!
NOTE!
EXHAUST
BLOWER
(OPTIONAL)
SUPPLY
MAIN VALVES
HEAT
RECIRCULATION
ALARM
DIRTY FILTERS
70
75
65 (OPTIONAL)
80
60
85
55
90
GREENHECK
®
BLOWER
EXHAUST
(OPTIONAL)
SUPPLY
MAIN VALVES
HEAT
ALARM
DIRTY FILTERS
70
75
65
80 (OPTIONAL)
GREENHECK
60
85
55
90
®
BLOWER
EXHAUST
(OPTIONAL)
SUPPLY
MAIN VALVES
HEAT
ALARM
DIRTY FILTERS
70
75
65
80 (OPTIONAL)
60
85
55
90
PHOTOHELIC
GREENHECK
®