Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 63)

Form I-PDH/SDH/PEH/SHH/PXH, Page 63
9.3 Startup
Checklist and
Warnings
CAUTION: If equipped with a cooling module with reheat, the
crankcase heater must be allowed to warm up for at least 24 hours
prior to startup. Disable cooling controls before turning on power
to warm up crankcase heaters. See Hazard Levels, page 2.
 Close and latch the doors.
IMPORTANT: If equipped with digital controls, when turning on the main controller
for the first time, be sure to push and hold the Function Key for five seconds. This
should cause the first LED to light. If the LED light is lit, the controller will remain
on and allow for remote control even after a power outage. If the LED light is not
lit, it will be necessary to restart the controller at the unit after a power outage.
 Read and follow the preparation instructions below on power supply voltage
phasing. When ready, turn on the power. Turn on the gas.
Power Supply Voltage Phasing
Because it is possible to unknowingly connect 3-phase power in such a way
as to cause the blower and, if there is an optional reheat compressor, the
scroll compressor to rotate in reverse. It is very important to check this on
startup.
Blower Rotation - Check rotation on startup. If blower rotation is not correct, reverse
by interchanging two wires on the 3-phase supply connection to the blower motor.
Check Reheat Compressor (if equipped) - Connect refrigerant pressure gauges
to the suction and discharge lines of the compressor and an electric meter to the
power supply.
CAUTION: Be sure to connect pressure gauges to the suction
and discharge lines before system startup so that compressor
rotation can be checked immediately. A scroll compressor will
be destroyed if allowed to operate in the wrong direction. See
Hazard Levels, page 2.
Adjust the controller so that a call for reheat exists. Immediately at startup,
observe the gauges. If the suction pressure rises and discharge pressure
drops, the compressor is operating in reverse and must be shut down. Turn
off the power and switch the 3-phase line voltage wiring connections before
restarting the unit.
(Important NOTE: If allowed to operate for several minutes in reverse, the
compressor’s internal protector will trip. If a compressor is repeatedly allowed to
restart and run in reverse, the compressor will be permanently damaged.)
9.2.4 Cooling Checklist Prior to Startup (PXH, PDH, SDH, SHH,
and PEH with cooling module ):
 Verify that the condensate drain(s) are connected and properly trapped. See
Paragraph 6.2 and 6.6.3.
 Verify that the refrigerant circuits are charged with the appropriate refrigerant and
leak tested according to the condensing unit instructions.
 Check heat section operation.
WARNINGS
For your safety, read before operating. If you do not follow these
instructions exactly, a fire or explosion may result causing property
damage, personal injury, or death.
• Models SDH, PDH, SHH - This appliance does not have a pilot. It is
equipped with an ignition device which automatically lights the burner. Do
not try to light the burner manually.