Functional Checkout - Nordyne R410-A User's Information And Installation Instructions Manual

Thermostat — Set the room thermostat func-
tion switch to OFF, fan switch to AUTO, and
move temperature setpoint to its highest setting.
Prior to applying electrical power to the outdoor
unit, ensure that the unit has been properly and
securely grounded, and that power supply con-
nections have been made at both the facility
power interface and outdoor unit.
Outdoor Unit — Ensure the outdoor coil and
top of the unit are free from obstructions and
debris, and all equipment access/control pan-
els are in place.
Using extreme caution, apply power to the unit
and inspect the wiring for evidence of open,
shorted, and/or improperly wired circuits.

Functional Checkout:

! CAUTION:
If equipped with a compressor
crankcase heater, wait 24 hours prior to
performing a function checkout to allow
for heating of the compressor
crankcase. Failure to comply may result
in damage and could cause premature
failure of the system.
Model
Number
1-1/2 Ton
2 Ton
2-1/2 Ton
3 Ton
3-1/2 Ton
4 Ton
5 Ton
Orifice Usage
12 SEER Split System Air Conditioner
Restrictor
Size (In.)
0.045
0.055
0.062
0.069
0.070
0.075
0.085
Indoor Blower — Set the thermostat function
switch to COOLING and the fan switch to ON.
Verify that the indoor blower is operating and
that airflow is not restricted. Set the fan switch
back to AUTO.
Blower time delay relay: A time delay relay is
provided with the unit and must be installed in
the indoor section. The relay will keep the
indoor blower running an additional 40 seconds
for increased cooling efficiency after the out-
door unit shuts off. The relay has four terminals
and one mounting hole.
Connect terminal "1" to load side of blower relay.
Connect terminal "2" to terminal "R" of T'stat.
Connect terminal "3" to common terminal at
blower relay or transformer. Connect terminal
"4" to terminal "G" on T'stat.
Low-Pressure Switch—(Select Models) A low-
pressure switch is factory-installed and located
in the suction line internal to the outdoor unit.
The switch is designed to protect the compres-
sor from a loss of charge. Under normal condi-
tions, the switch is closed. If the suction pres-
sure falls below 5 psig, then the switch will open
and de-energize the outdoor unit. The switch
will close again once the suction pressure in-
creases above 20 psig. Please note that the
switch interrupts the thermostat inputs to the
unit. Thus when the switch opens and then
System Charge
R-410A oz.
75
78
89
94
105
136
153
5