—7—
ACCESSORY DESCRIPTION AND USAGE (Listed Alphabetically) Continued
11.
Low-Ambient Pressure Switch
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 (approximately 100 psig to 225 psig). The control maintains working head pressure at low-ambient temperatures down to 0°F
when properly installed.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).
12.
Low-Pressure Switch
Auto reset SPST switch activated by refrigerant pressure on liquid side of refrigerant circuit. Cycles compressor off if refrigerant charge is lost. To prevent
rapid compressor recycling, Cycle Protector can be used with this switch.
SUGGESTED USE: Where indoor coil is exposed to ‘‘dirty’’ air.
All commercial installations.
13.
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, it maintains condensing temperature at 100°F ± 10°F.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F.
All commercial installations.
14.
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.
15.
Support Feet
Four stick-on plastic feet which raise the unit 4 in. above the mounting pad. This allows sand, dirt, and other debris to be flushed from the unit base
minimizing corrosion.
SUGGESTED USE: Coastal installations.
Windy areas or where debris is normally circulating.
Rooftop installations.
For improved sound rating.
16.
Thermostatic Expansion Valve (TXV)
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 type valves are available. Do not use hard shutoff
TXV with Liquid-Line Solenoid Valve.
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 continued 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.
Required for use on all zoning systems.
18.
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 air conditioners where Low-Ambient Controller has been added.
SOUND POWER (dBA)
UNIT
SIZE
SOUND
LEVEL
(dBA)
OCTAVE BAND CENTER FREQUENCY (Hz)
125
250
500
1000
2000
4000
8000
018
68
50.0
56.5
61.0
63.5
59.0
54.5
45.5
024
70
55.0
61.5
62.5
64.5
61.0
55.0
49.0
030
72
55.0
58.0
61.5
63.5
62.5
56.5
51.5
036
74
56.5
63.5
68.0
70.0
63.0
57.5
52.0
042
74
56.5
60.5
64.5
67.5
61.5
58.0
53.0
048
74
56.0
61.0
67.0
67.5
66.0
63.0
56.5
060
76
63.5
66.0
69.0
69.0
66.5
64.0
56.5
