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Accessory description and usage (Listed alphabetically) continued
10. Low-Ambient Controller
Head pressure controller is a cycle control device activated by a temperature sensor mounted on a header tube of the outdoor coil. It is designed to cycle
the outdoor fan motor in order to maintain condensing temperature within normal operating limits (approximately 100°F (37.8°C) high and 60°F
(15.6°C) low). The control will maintain working head pressure at low-ambient temperatures down to 0°F (–17.8°C) when property installed.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).
11. MotorMaster® Control
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 ± 5.5°C).
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).
All commercial installations.
12. Outdoor Air Temperature Sensor
A device that allows the temperature at a remote location (outdoors) to be displayed at the thermostat.
SUGGESTED USE: All corporate programmable thermostats.
13. Outdoor Thermostat
An SPDT temperature actuated switch which turns on supplemental electric heaters when outdoor air temperature drops below set point.
SUGGESTED USE: Heat pump installations with multiple-stage supplemental heaters
14. Secondary Outdoor Thermostat
An SPDT temperature actuated switch which turns on a third stage of supplemental electric heaters when outdoor air temperature drops below the
second-stage set point.
SUGGESTED USE: Heat pump installations where 3-stage operation of supplemental heaters is desired.
15. Sound Hood
Wraparound sound attenuation cover for the compressor. Reduces the sound level by about 2 dBA.
SUGGESTED USE: Unit installed closer than 15 ft (4.55m) to quiet areas—bedrooms, etc.
Unit installed between 2 houses less than 10 ft (3.04m) apart.
16. 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. Kit includes valve, adapter tubes, and external equalizer tube. Both hard shutoff and RPB valves are available.
SUGGESTED USE: For improved system performance in cooling mode for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
Required for use on all zoning systems.
17. Time-Delay Relay
An SPST delay relay which briefly continues operation of the indoor blower motor to provide additional cooling after the compressor cycles off.
SUGGESTED USE: For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
18. Unit Risers
Six-in. tall plastic rails that are used to elevate outdoor units above mounting pad. The risers are adjustable from 24- to 34-in. long..
SUGGESTED USE: Heat pump installations in light to moderate snowfall areas.
Coastal installations.
Windy areas where debris can circulate.
Rooftop installations.
19. Winter Start Control
An SPST delay relay which bypasses the low-pressure switch for approximately 3 minutes to permit start-up for cooling operation under low-load
conditions.
SUGGESTED USE: All heat pumps where Low-Ambient Controller has been added.
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