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ACCESSORY USAGE GUIDELINE
ACCESSORY
REQUIRED FOR LOW---AMBI-
ENT COOLING APPLICATIONS
(Below 55°F/12.8_C)
REQUIRED FOR LONG
LINE
APPLICATIONS*
(Over 80 ft./24.38 m)
REQUIRED FOR
SEA COAST
APPLICATIONS
(Within2miles/3.22km)
Ball Bearing Fan Motor Yes{ No No
Compressor Start Assist Capacitor and Relay Yes Yes No
Crankcase Heater Yes Yes No
Evaporator Freeze Thermostat Yes No No
H ard Shu t --- Off T XV Yes Yes Yes
Liquid Line Solenoid Valve No No No
Motor Master
®
Control or
Low --- ambi ent Pr essu re Swi tc h
Yes No No
Support Feet Recommende d No Recommended
Winter Start Control Yes No No
* For tubing lin e sets between 80 and 200 f t. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Split---System Longline
Application Gui deline.
{ Required for Low---Ambient Controller (full modulation feature) MotorMasterr Control.
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.
Usage Guideline:
Required on all units when using MotorMasterr
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 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. Cycle Protector
The cycle protector is designed to prevent compressor short
cycling. This control provides an approximate 5--minute delay after
power to the compressor has been interrupted for any reason,
including power outage, protector control trip, thermostat jiggling,
or normal cycling.
6. 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.
7. 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 must be used when
cooling operation is at outdoor temperatures below
55_F (12.8_C) to a minimum of 0_F (--17.8_C).
Suggested for all commercial applications.
8. MotorMasterr Low--Ambient Controller
A fan--speed control device activated by a temperature sensor,
designed to control condenser fan motor speed in response to the
saturated, condensing temperature during operation in cooling
mode only. For outdoor temperatures down to --20_F (--28.9_C), it
maintains condensing temperature at 100_F ±10_F (37.8_C ±
6.5_C).
Usage Guideline:
A MotorMasterr Low Ambient Controller or
Low--Ambient Pressure Switch must be used when
cooling operation is used at outdoor temperatures
below 55_F (12.8_C).
Suggested for all commercial applications.
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