Optional Electric Heater Kits; Startup & Adjustments; Pre-Start Check List; Start-Up Procedures - Nordyne 4-5 TON SERIES User's Manual & Installation Instructions

Recommended T-Stat Wire
Thermostat
Wire gauge
2-Wire
(Heating)
24 55
22 90
20 140
18 225
Table 1. Thermostat Wire gauge

Optional Electric heater Kits

Optional field-installed electric heater kits may be
available in multiple heating capabilities up to a maximum
of 36kw. Split System Air Conditioners are designed to
allow optional auxiliary electric heat to be field installed
as required by the building's particular heating load. The
options available for each unit are shown in the heater
kit installation instructions or the air handler's Technical
Service Literature.
Install the heater kits as directed by the instructions
supplied with the heater kit. Follow all cautions and
warnings as directed.
STARTUP & ADjUSTMENTS

Pre-Start Check List

√ 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 refrigerant tubing is properly connected
and leak checked.
√ Verify that the unit is properly charged with the
refrigerant listed on the rating label.
√ 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 power supply branch circuit overcurrent
protection is sized properly.
√ Verify that the thermostat is wired correctly.

Start-up Procedures

WARNINg:
If this 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.
8
Length (Unit to T-Stat)
5-Wire
(Heating/Cooling)
25
45
70
110
The thermostat's function mode should be set to OFF and
the fan mode should be set to AUTO. Close all electrical
disconnects to energize the system.

Air Circulation - Indoor Blower

1. Set the thermostat system mode on OFF and the fan
mode to ON.
2. Verify the blower runs continuously. Check the air delivery
at the supply registers and adjust register openings for
balanced air distribution. If insufficient air is detected,
examine ductwork for leaks or obstructions.
3. Set the thermostat fan mode to AUTO and verify the
blower stops running.
NOTE: On 3 phase air handler models only - If blower
is spinning opposite of arrow direction, shut off the main
power to the unit and switch any two field wires at the
disconnect. DO NOT alter unit wiring.

Anti-Short Cycle Timer Protection

1. Set the thermostat system mode to COOL. Note the
temperature setting of the thermostat and gradually raise
the set-point temperature until the unit de-energizes.
2. Immediately lower the set-point temperature of the
thermostat to its original setting and verify that the
indoor blower is energized and outdoor unit remains
de-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. NOTE: 3 phase
air conditioners DO NOT have short cycle protection.

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. Verify blower wheel is spinning in direction indicated by
arrow. 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. Verify HI and LO refrigerant pressures.
NOTE: If refrigerant pressures are abnormal and the
compressor is rotating backwards, shut off main power to
the unit and switch any two field wires at the disconnect.
DO NOT alter unit wiring.
4. Allow the 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 the ON position.