Component Functions; Low Pressure Switch; High Pressure Switch - Nordyne R-410A User's Manual & Installation Instructions

COMPONENT FUNCTIONS

Low Pressure Switch

The low pressure switch is factory installed and
located in the suction line internal to the unit. The
switch is designed to protect the compressor if a
loss of charge occurs. Under normal conditions,
the switch is closed.
If the suction pressure falls below 5 psig, then
the switch will open and de-energize the unit. The
switch will close again once the suction pressure
increases above 20 psig. The low pressure
switch interrupts the thermostat inputs to the unit.
NOTE: When the switch opens and then closes,
there will be a 5 minute short cycling delay before
the unit can energize.
Model Q5RF
X24K
X36K
X48K
X60K
* Denotes Factory Set Low Speed Cooling/ Heating
** Denotes Factory Set High Speed Cooling/ Heating
*** Denotes Factory Set Electric Heating Speed
INSTALLER: PLEASE LEAVE THESE INSTALLATION INSTRUCTIONS WITH THE HOMEOWNER.
O'Fallon, MO
Wire Color/Speed Tap
T1
Orange/T2
Black/T3
Red/T4
T5
Orange/T1
T2
Black/T3
Red/T4
T5
Orange/T1
T2
Red/T3
Black/T4
T5
Orange/T1
T2
Red/T3
Black/T4
T5
Table 4. Motor Lead Connection
¢709158D¤
7091580

High Pressure Switch

The high pressure switch is factory installed
and located in the compressor discharge line
internal to the unit. The switch is designed to de-
energize the system when very high pressures
occur during abnormal conditions. Under normal
conditions, the switch is closed.
If the discharge pressure rises above 650 psig,
the switch will open and de-energize the unit.
The switch will close again once the discharge
pressure decreases to 460 psig. The high
pressure switch interrupts the thermostat inputs
to the unit. NOTE: When the switch opens and
then closes, there will be a 5 minute short cycling
delay before the unit can energize.
Motor Speed
Low
Medium/Low*
Medium**
Medium/High***
High
Low*
Medium/Low
Medium**
Medium/High***
High
Low*
Medium/Low
Medium***
Medium/High**
High
Low
Medium/Low*
Medium***
Medium/High**
High
Air Flow
(@ 0.3 in WC)
560
600
800
1,040
1,250
600
750
1,200
1,420
1,520
1,030
1,240
1,400
1,530
1,680
1,060
1,200
1,500
1,760
1,970
7091580
Specifi cations and illustrations
subject to change without
notice or incurring obligations.
Printed in U.S.A. (02/10)