Specifications
PRODUCT SPECIFICATIONS Split System Heat Pump: R4H4
428 65 6008 00 13
Specifications subject to change without notice.
Accessory Description and Usage (Listed Alphabetically)
1. Ball−Bearing Fan Motor
A fan motor with ball bearings which permits speed reduction
while maintaining bearing lubrication.
2. Compressor Start Assist − Capacitor and Relay
Start capacitor and relay gives a hard boost to compressor motor
at each start up.
Usage Guideline:
Required for reciprocating compressors in the following
applications:
Long line
Low ambient cooling
Hard shut off expansion valve on indoor coil
Liquid line solenoid on indoor coil
Required for single−phase scroll compressors in the
following applications:
Long line
Low ambient cooling
Suggested for all compressors in areas with a history of
low voltage problems.
3. Compressor Start Assist — PTC Type
Solid state electrical device which gives a soft boost to the
compressor at each start−up.
Usage Guideline:
Suggested in installations with marginal power supply.
4. Crankcase Heater
An electric resistance heater which mounts to the base of the
compressor to keep the lubricant warm during off cycles.
Improves compressor lubrication on restart and minimizes the
chance of liquid slugging.
Usage Guideline:
Required in low ambient cooling applications.
Required in long line applications.
Suggested in all commercial applications.
5. Evaporator Freeze Thermostat
An SPST temperature−actuated switch that stops unit operation
when evaporator reaches freeze−up conditions.
Usage Guideline:
Required when low ambient kit has been added.
6. Isolation Relay
An SPDT relay which switches the low−ambient controller out of
the outdoor fan motor circuit when the heat pump switches to
heating mode.
Usage Guideline:
Required in all heat pumps where low ambient kit has
been added.
7. Liquid−Line Solenoid Valve (LLS)
An electrically operated shutoff valve which stops and starts
refrigerant liquid flow in response to compressor operation. It is
to be installed at the outdoor unit to control refrigerant off cycle
migration in the heating mode.
Usage Guideline:
An LLS is required in all long line heat pump
applications to control refrigerant off cycle migration in
the heating mode. See Long Line Guideline.
8. Low−Ambient Pressure Switch Kit
A long life pressure switch which is mounted to outdoor unit
service valve. It is designed to cycle the outdoor fan motor in
order to maintain head pressure within normal operating limits.
The control will maintain working head pressure at low−ambient
temperatures down to 0_F (−17.8_C) when properly installed.
Usage Guideline:
A Low−Ambient Pressure Switch
Low−Ambient Controller must be used when cooling
operation is used at outdoor temperatures below 55_F
(12.8_C).
9. Sound Jacket
Wraparound sound reducing cover for the compressor. Reduces
the sound level by about 2 dBA.
Usage Guideline:
Suggested when unit is installed closer than 15 ft.
(4.577 m) to quiet areas, bedrooms, etc.
Suggested when unit is installed between two houses
less than 10 ft. (3.05 m) apart.
10. Thermostatic Expansion Valve (TXV) Bi−Flow
A modulating flow−control valve which meters refrigerant liquid
flow rate into the evaporator in response to the superheat of the
refrigerant gas leaving the evaporator.
Usage Guideline:
Accessory required to meet AHRI rating and system
reliability, where indoor not equipped.
Required in all heat pump applications designed with
R−410A refrigerant.
11. Time−Delay Relay
An SPST delay relay which briefly continues operation of indoor
blower motor to provide additional cooling after the compressor
cycles off.
Note: Most indoor unit controls include this feature. For those
that do not, use the guideline below.
Usage Guideline:
Accessory required to meet AHRI rating, where indoor
not equipped.