6
ACCESSORY USAGE GUIDELINE
ACCESSORY
REQUIRED FOR
LOW---AMBIENT COOLING APPLICA-
TIONS
(Below 55°F/12.8_C)
REQUIRED FOR LONG LINE AP-
PLICATIONS*
(Over 80 ft/24.38 m)
REQUIRED FOR SEA COAST
APPLICATIONS (Within 2
miles/3.22 km)
Crankcase Heater Standard
Standard
Standard
Evaporator Freeze Protection
Standard with Infinityt Control
(Low Ambient not allowed with n on ---
communicating thermostat)
No No
Liquid---Line Solenoid Valve No
Yes
No
Low--- Ambient Control
Standard with Infinity Control (Low am-
bient not allowed with non ---communic-
ating thermostat)
No No
Puron Refrigerant Balance Port Hard---
ShutOff TXV
Ye s {
Ye s {
Ye s {
Support Feet Recommended No Recommended
Winter Start Control
Standard with Infinity Control
(Low Ambient not allowed with non---
communicating thermostat)
No No
* For tubing set lengths between 80 and 200 ft. (24.38 an d 60.96 m) horizontal or 20 ft. (6.10 m) vertica l differentia l (total equivalent length), refer to the Long
Line Guideline—Air Conditioners and Heat Pumps using Puron® Refrigerant.
{ Required on all indoor units. Standard on all new Puron refrigerant fan coils and furnace coils.
Accessory Description and Usage (Listed Alphabetically)
1. Compressor Start Assist -- Capacitor and Relay
Start capacitor and relay gives a “hard” boost to compressor motor
at each start up.
Usage Guideline:
Available if required by local codes.
2. 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.
3. 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.
Suggested for all commercial applications.
4. Outdoor Air Temperature Sensor
Designed for use with Carrier Thermostats listed in this
publication. This device enables the thermostat to display the
outdoor temperature. This device also is required to enable special
thermostat features such as auxiliary heat lock out.
Usage Guideline:
Suggested for all Carrier thermostats listed in this
publication.
5. Snow Stand
Coated wire rack which supports unit 18 in. (457.2 mm) above
mounting pad to allow for drainage from unit base.
Usage Guideline:
Suggested in the following applications:
Heat pump installations in heavy snowfall areas.
Heat pump installations in snow drift locations.
Heat pump installations in areas of prolonged
subfreezing temperatures.
All commercial installations.
6. 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 ARI rating and system
reliability, where indoor not equipped.
Required in all heat pump applications designed with
Puron refrigerant.
25HNB6
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