Warning – Reznor Q6SD (3ph) Unit Installation Manual User Manual

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2. Immediately lower the set point temperature of the

thermostat to its original setting and verify that the
indoor blower is energized.

3. After approximately 5 minutes, verify the compressor

and fan energize and the temperature of the discharge
air is cooler than the room temperature.

System Cooling
1. Set the thermostat’s system mode to COOL and the

fan mode to AUTO. Gradually lower the thermostat
temperature setpoint below room temperature and
verify the outdoor unit and indoor blower energize.

2. Feel the air being circulated by the indoor blower

and verify that it is cooler than ambient temperature.
Listen for any unusual noises. If unusual sounds
occur, determine the source of the noise and correct
as necessary.

3. Allow the cooling system to operate for several minutes

and then set the temperature selector above room
temperature. Verify the fan and compressor cycle off
with the thermostat. NOTE: The blower should also
stop unless fan mode is set to ON.

System Heating
If the unit has been equipped with optional electric heater
kits, set the thermostat's system mode to HEAT and the
fan mode to AUTO. Verify the compressor and outdoor
fan are not energized but that the blower and heaters are.
Feel the air being circulated by the indoor blower and verify
that it is warmer than ambient temperature. Listen for any
unusual noises. If unusual sounds occur, determine the
source of the noise and correct as necessary.

Refrigerant Charging

WARNING:

Q6SD Heat Pumps are shipped fully charged
with R-410A refrigerant and ready for installation.
When a system is installed according to these
instructions, no refrigerant charging is required.
If repairs make it necessary for evacuation and
charging, it should only be done by qualifi ed,
trained personnel thoroughly familiar with this
equipment. Some local codes require licensed
installation/service personnel to service this type
of equipment. Under no circumstances should
the owner attempt to install and/or service this
equipment. Failure to comply with this warning
could result in property damage, personal injury,
or death.

The system refrigerant charge can be checked and
adjusted through the service ports provided at the front
panel. Use only gauge lines which have a Schrader
depression device present to actuate the valve.

Table 3. Thermostat Wire Gauge

Thermostat

Wire Gauge

Recommended T-Stat Wire Length

(Unit to T-Stat)

2-Wire

(Heating)

5-Wire

(Heating/Cooling)

140

225

110

START UP & ADJUSTMENTS

Pre-Start Check List

 Verify the unit is level and allows condensate to drain.

 Verify the outdoor coil and top of the unit are free from

obstructions and debris, and all equipment access/
control panels are in place.

 Verify that the duct work is sealed to prevent air leakage.

 Verify that the line voltage power leads are securely

connected and the unit is properly grounded.

 Verify that the low voltage wires are securely connected

to the correct leads on the low voltage terminal strip.

 Verify that the outdoor fan turns freely.

 Verify that the power supply branch circuit overcurrent

protection is sized properly.

 Verify that the thermostat is wired correctly. The

thermostat system mode should be set to OFF and
the thermostat fan mode should be set to AUTO.

Start-Up Procedure
Close all electrical disconnects to energize the system.

WARNING:

If the unit is equipped with a crankcase heater,
allow 24 hours prior to continuing the start up
procedures to allow for heating of the refrigerant
compressor crankcase. Failure to comply may
result in damage and could cause premature
failure of the system. This warning should be
followed at initial start up and any time the power
has been removed for 12 hours or longer.

Air Circulation
Leave the thermostat system mode on OFF, and set the
fan mode to ON. Blower should run continuously. Check
the air delivery at the supply registers and adjust register
openings for balanced air distribution. Examine ductwork
for leaks or obstruction if insuffi cient air is detected. Set
the thermostat fan mode to AUTO. The blower should
stop running.

Short Cycle Protection
1. With the system operating in cooling mode, note the

temperature setting of the thermostat and gradually
raise the set-point temperature until the unit de-
energizes.