Nordyne Q4 Series - Manual (Page 10)

10
interval settings are available: 30 minutes, 60
minutes, and 90 minutes. Time setting selection
is dependent on the climate where the unit is
being installed.
Example 1. Dry climate of Southern
Arizona. A 90 minute setting is
recommended.
Example 2. Moist climate of Seattle,
Washington. A 30 minute setting is
recommended.
To set the cycle timer, place the timing pin on the
defrost control board to the desired time interval
post.
Note: All units are shipped from the factory with
the default time setting of 30 minutes.
START UP AND SYSTEM CHECK
Pre-Start Check List
• Verify that the unit is level to allow proper
condensate drainage.
• Verify that there is free airflow to and from
the outdoor coil and that all clearance
requirements are met.
• 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.
Q4SA-048D & Q4SA-060D Blower Wiring
Figure 9. Motor Lead Connection
Q4SA-036D Blower Wiring
Blower Speed
Blower Leads Low Medium High
Red BR T3 TB T1 TB T2
Black BR T6 BR T6 BR T3
Gray BR T4 BR T4 BR T4
Blue TB T1 BR T3 TB T1
Violet BR T5 BR T5 BR T5
Blower Speed
Blower Leads Low Medium High
Red BR T3 TB T1 TB T2
Black BR T6 BR T6 BR T3
Gray BR T4 BR T4 BR T6
Blue TB T1 BR T3 BR T5
Violet TB T1 TB T2 TB T1
BR T( ) - Blower Relay Terminal (number)
TB T( ) - Terminal Block Terminal (number)
• Verify that all exterior panels are replaced
and securely fastened.
• 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 function switch should be
set to “Off’ and the thermostat fan switch
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
switch set to “Off” and set the thermostat fan
switch to “On.” The blower motor should run
continuously. Check for air delivery at the
register(s). Ensure that there are no obstructions
at the registers or in the duct work. Set thermostat
fan switch to “Auto.”
System Cooling
1. Set the thermostat system switch to “Cool”
and the thermostat fan switch to “Auto”.
Gradually lower the thermostat temperature
switch below room temperature and
observe that the blower, compressor, and
fan energize. Check that air cooler than
room temperature is being discharged at
the register. Listen for any unusual noises.
2. After allowing the unit to run for several
minutes, set the temperature selector above
room temperature. The fan and compressor
cycles off with the thermostat. The blower
should also stop unless fan switch is set to
“ON” position.
System Heating — Set the system thermostat
switch to HEAT and set the thermostat fan
switch to AUTO. Verify that the compressor,
outdoor fan, and blower are energized. Check
for warm air at the supply registers.