Table of Contents
Advertisement
System Overview
Refer to the applicable Thermostat Installer Setup Guide
The outdoor control provides the following functions:
•
Internal switching of outputs.
•
Compressor anti-short-cycle delay (adjustable through
the thermostat interface).
•
Five-strike lockout function.
•
High Pressure protection using the High Pressure
Switch (S4) and Low Pressure Pressure protection
using the Suction Pressure Transducer with setpoints
that emulates a low pressure switch. (Cut-out of 40
psig and cut-in of 90 psig).
•
Ambient (RT13), liquid line (RT36) and suction line
(RT41) temperatures for monitoring and protection.
Compressor Protection – Five-Strike Lockout
for both high (S4) and low (S87) pressure switches.
Resetting Five-Strike Lockout
control R terminal must be cycled OFF.
Crankcase Heater (HR1)
Compressors in all units are equipped with a 40-watt
bellyband- type crankcase heater. HR1 prevents liquid
from accumulating in the compressor. HR1 is controlled by
the crankcase heater thermostat.
Crankcase Heater Thermostat (S40)
Thermostat S40 controls the crankcase heater in all
units. S40 is located on the liquid line. When liquid line
temperature drops below 50°F, thermostat S40 closes,
energizing HR1. The thermostat opens, de-energizing
HR1, once liquid line temperature reaches 70°F.
Maintenance
Outdoor Unit
installer or service agency. At the beginning of each cooling
season, the system should be checked as follows:
1.
2.
Outdoor unit fan motor is factory-lubricated and
sealed. No further lubrication is needed.
3.
Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
4.
Check all wiring for loose connections.
5.
Check for correct voltage at unit (unit operating).
6.
Check amp draw on outdoor fan motor.
7.
Inspect drain holes in coil compartment base and
clean if necessary.
NOTE:
should be gauged and refrigerant charge should be
checked.
Outdoor Coil
if it is exposed to substances which are corrosive or which
corrosive chemicals such as salts).
•
a water hose.
•
Outdoor Coil (Coastal Area) — Moist air in ocean
locations can carry salt, which is corrosive to most
metal. Units that are located near the ocean require
frequent
inspections
inspections will determine the necessary need to
wash the unit including the outdoor coil. Consult your
installing contractor for proper intervals/procedures for
your geographic area or service contract.
Page 52
and
maintenance.
These
31-5000746 Rev. 0
Advertisement
Table of Contents
