43
XC20
Reconfiguring Outdoor Control using
iComfort Wi-Fi
®
or iComfort S30
Thermostat
If any component of the HVAC system is changed, e.g. re
placing an outdoor sensor, reconfiguring the system is
required. To begin reconfiguring a system, select the
Setup tab.
System Overview
Refer to the applicable Thermostat Installer Setup Guide
for configuration procedures.
IMPORTANT
Some scroll compressors have internal vacuum
protector that will unload the scrolls when suction
pressure goes below 20 psig. A hissing sound will be
heard when the compressor is running unloaded.
Protector will reset when low pressure in system is raised
above 40 psig. DO NOT REPLACE COMPRESSOR.
The outdoor control provides the following functions:
D Internal switching of outputs.
D Compressor anti-short-cycle delay (adjustable
through the thermostat interface.
D Five-strike lockout function.
D High (S4) and low (S87) pressure switches.
D Ambient (RT13) and liquid line (RT36) temperatures
monitoring and protection.
COMPRESSOR PROTECTION — FIVE-STRIKE
LOCKOUT
The five-strike lockout function is designed to protect the
compressor from damage. The five-strike feature is used
for both high (S4) and low (S87) pressure switches.
Resetting Five-Strike Lockout
Once the condition has been rectified, power to the outdoor
control R terminal must be cycled OFF.
Diagnostic Information
The following diagnostic information is available through
the thermostat's user interface. Refer to the applicable In
staller System Setup Guide.
D Compressor anti-short-cycle delay timer status
D Cooling rate
D Compressor shift delay timer status
D High pressure switch status
D Low pressure switch status
D Compressor top cap switch status
D Liquid line temperature
D Outdoor ambient temperature
D Outdoor fan RPM
D Compressor active alarm
D Compressor Hz
D Inverter compressor short cycle
D Heat sink temperature
Installer Test
Verify the proper operation of the system by running the In
staller Test feature through the thermostat interface. Refer
to the applicable Installer System Setup Guide.
COMPRESSOR SHORT CYCLING DELAY
The outdoor control protects the compressor from:
D Short cycling (five minutes) during initial power-up.
D Interruption in power to the unit.
D Pressure or sensor trips.
D Delay after demand is removed.
The delay is set by default for 300 seconds (five minutes)
but can be changed through the thermostat interface.
Available settings are 60, 120, 180, 240 and 300 seconds.
CRANKCASE HEATER (HR1)
Compressors in all units are equipped with a 40-watt belly-
band-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 temperat
ure drops below 50°F, thermostat S40 closes, energizing
HR1. The thermostat opens, de-energizing HR1, once li
quid line temperature reaches 70°F.
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