Greenheck MPX (472695) - Manual (Page 23)

Pre Start-Up Checklist –
complete prior to
application of power
o Verify proper drain trap installation (refer to
Condensate Drain section).
o Look over the piping system. Inspect for oil at
all tubing connections. Oil typically highlights a
leak in the system. If a leak is present, refer to the
Maintenance section in this manual.
o Inspect all coils within the unit. Fins may get
damaged in transit or during construction. Carefully
straighten fins with a fin comb.
o If there is an indirect gas-fired furnace in this unit,
refer to the PVF IOM provided with this unit for Pre
Start-Up information.
o Check the radial gap and overlap on the plenum-
type fan(s). Adjust if necessary.
o Check condensing fans for any damage or
misalignment. Spin the blades and make sure they
are free turning without any resistance.
o If this unit has packaged DX, each compressor will
have a crankcase heater which must have power
supplied to it at least 24 hours prior to start-up. If
start-up is scheduled in 24 hours, unlock the power
disconnect and energize the unit.
SPECIAL TOOLS REQUIRED
• Voltage Meter (with wire probes)
• Amperage Meter
• Pressure Gauges – (refrigerant)
• Tachometer
• Thermometer
• Incline manometer or equivalent
Start-Up Checklist
The unit will be in operational mode during start-up.
Use necessary precautions to avoid injury. All data
must be collected while the unit is running. In order to
measure volts and amps, the control center door must
be open, and the unit energized using an adjustable
wrench to turn the disconnect handle.
After power has been applied for
24 hours, verify that all crankcase
heaters are heating properly. Either
check the amp draw on each heater
or touch the compressor near
the top to verify that the heater is
warming the compressor.
WARNING
Do not touch the crankcase heater! It will cause
burns. See image.
WARNING
All motor(s) / compressor(s) have been checked for
rotation. If blower rotation is incorrect, wiring must
be changed at the disconnect to ensure all motor(s) /
compressor(s) are corrected.
Operation of scroll compressor(s) in this unit are
directional and will be damaged if run in the wrong
direction.
Crankcase Heater
(silver colored band)
Electrical Start-Up Checklist
Crankcase Heaters Working Yes / No
Check line voltage at unit disconnect
__________ L1-L2 volts
__________ L2-L3 volts
__________ L1-L3 volts
Motor Amp Draw
Supply Fan
Relief Fan (if present)
__________ L1 amps __________ L1 amps
__________ L2 amps __________ L2 amps
__________ L3 amps __________ L3 amps
Fan RPM
__________ Supply Fan
__________ Relief Fan (if present)
Correct fan rotation
Supply Fan
Yes / No
Relief Fan Yes / No
23 Model MPX Make-Up Air Unit
®