Greenheck DG/DGX Pilot Ignition (470651_IOM) - Manual (Page 14)

Installation of Building Pressure
Control (optional)
1. Mount Pressure Tap
Using the factory provided bracket, mount the
pressure tap to the
outside of the unit.
Choose a location
out of the prevailing
winds and away from
supply or exhaust
fans to assure
accurate readings.
2. Run Pressure Tap Lines
Run a pressure tap line from the pressure tap on the
outside of the unit to the low pressure tap on the back
of the photohelic gauge. Run a second pressure tap
line from the high pressure tap on the back of the
photohelic gauge to the space. Fifty feet of tubing is
supplied with the unit.
3. Set the Building Pressure
The pressure gauge is used to set the desired building
pressure.
The pressure is set by adjusting the knobs for the
upper and lower pressure limits. Typical settings are
0.0 inch wc for the lower and 0.10 inch wc for the
upper pressure setting.
Start-Up - Blower
1. Check the Voltage
Before starting the unit, compare the supplied voltage,
hertz, and phase with the unit and motor’s nameplate
information.
2. Check the Blower Rotation
Open the blower access door and
run the blower momentarily to
determine the rotation.
Arrows are placed on the blower
scroll to indicate the proper
direction or reference the
example shown to the right.
Refer to the Start-Up Checklist in the Reference
section before proceeding further!
Pre Start-Up Check
Rotate the fan wheel by hand and make sure no
parts are rubbing. Check the V-belt drive for proper
alignment and tension (a guide for proper belt tension
and alignment is provided in the Belt Maintenance
section). Check fasteners, set screws and locking
collars on the fan, bearings, drive, motor base, and
accessories for tightness.
WARNING
Check the housing, blower, and ductwork for any
foreign objects before running the blower.
WARNING
Disconnect and lock-out all power and gas before
performing any maintenance or service to the unit.
Failure to due so could result in serious injury or
death and damage to equipment.
Electrical Nameplate
SUP HP
MCA MOP
VOLTS HZ PH
Unit’s Total MCA
Voltage, Hertz, Phase
DGK
Blower Rotation
Blower
Housing
R
ot
at
ion
Connections for Photohelic Gauge
Factory
Wiring
High Pressure
Tap
to space
Low Pressure
Tap
to outside
Typical Photohelic Gauge
Pressure Indicating Needle Pressure Setting Needles
Pressure Setting Knobs
SPECIAL TOOLS REQUIRED
• Voltage Meter (with wire probes)
• Amperage Meter
• Pressure Gauges – (refrigerant)
• Tachometer
• Thermometer
• U-Tube Manometer
Model DG / DGX Pilot Ignition Make-Up Air 14
®