Reznor RXH (Outdoor PreevA) Unit Installation Manual - Manual (Page 61)

Form I-RDH/REH/RHH/RXH (12-14), P/N 215210 R14, Page 61
 Check heat 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.
• RDH and RHH - These appliances do not have a pilot. They are equipped with an ignition
device which automatically lights the burner. Do not try to light the burner manually
• Before operating, smell all around the appliance area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave your building immediately.
• Immediately call your gas supplier from a phone remote from the building. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call your fire department.
9.3 Startup Warnings
and Checklist
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 warmup 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 on 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 compres-
sor’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 (if
equipped) Checklist
Prior to Startup:
 Verify that the condensate drain(s) are connected and properly trapped.
(Paragraphs 6.2 and 6.6.4)
 Verify that the refrigerant circuits are charged with the appropriate refrigerant and
leak tested according to the condensing unit instructions.