—6—
PH13
OPTIONAL EQUIPMENT USAGE GUIDELINE
* For tubing line sets between 80 and 175 ft, refer to Residential’s Split Systems Long-Line Application Guidelines.
OPTIONAL EQUIPMENT DESCRIPTION AND USAGE (Listed Alphabetically)
1.
Ball-Bearing Fan Motor
A fan motor with ball bearings which permits speed reduction while maintaining bearing lubrication.
Usage Guideline:
Required on all units when MotorMaster®—Low-Ambient Controller is installed.
2.
Compressor 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.
Note:
Some heat pumps are factory supplied with a crankcase heater. See accessory list for units that come standard with a crankcase heater. For units
that do not, use the guideline below.
Usage Guideline:
Required in low ambient cooling applications.
Required in long line applications.
Suggested in all commercial applications.
3.
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 single-phase 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
4.
Compressor Start Assist – PTC Type
Solid-state electrical device which gives a "soft" boost to the compressor motor at each start up.
Usage Guideline:
Suggested when compressor power supply is marginal.
Suggested in reciprocating compressor applications with rapid pressure balance (RPB) expansion valve on indoor coil.
5.
Compressor Sound Hood
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 to quiet areas—bedrooms, etc.
Suggested when unit is installed between two houses less than 10 ft apart.
6.
Cycle Protector
Solid-state timing device which prevents compressor rapid recycling. This control provides an approximate 5-minute delay after power to the compressor
has been interrupted for any reason, including normal room thermostat cycling.
Usage Guideline:
Suggested in the following applications:
Installations in areas where power interruptions are frequent.
Where user is likely to "play" with the room thermostat.
All commercial installations.
Long line applications.
High-rise applications.
7.
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.
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(Below 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(Over 80 Ft)
Crankcase Heater Yes Yes
Evaporator Freeze Thermostat Yes No
Accumulator No No
Compressor Start Assist
Capacitor and Relay
Ye s Ye s
MotorMaster®—Low-Ambient Controller Yes No
Wind Baffle See Low-Ambient Instructions No
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
No
See Long-Line
Application
Guideline
Ball Bearing Fan Motor Yes No
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