18-GL07D1-4
19
2GN SPLIT INSTALLER’S GUIDE
Emergency Heat (W only)
The blower is started on high speed, and the fi rst stage of
resistance heat is energized 10 seconds after the "W" input.
Continuing demand will engage the additional stages of
resistance heat 90 seconds after the fi rst stage.
Cooling Operation
In all cooling operations, the reversing valve directly tracks the
“O” input. Thus, anytime the “O” input is present, the reversing
valve will be energized.
Cool, 1st Stage (Y1,O)
The blower motor and hot water pump are started immediately,
the loop pump(s) is energized 5 seconds after the “Y1” input is
received. The compressor will be energized (on low capacity
for Dual Capacity units) 10 seconds after the “Y1” input.
The ECM blower will operate at 85% of medium speed if in
dehumidifi cation mode.
Cool, 2nd Stage (Y1, Y2, O)
Dual Capacity Units
The second stage compressor will be activated 5 seconds
after receiving a “Y2” input as long as the minimum fi rst stage
compressor run time of 1 minute has expired. The ECM blower
changes to high speed 15 seconds after the “Y2” input (85%
of high speed if in dehumidifi cation mode).
Blower (G only)
The blower starts and operates on low speed.
Lockout Conditions
During lockout mode, the appropriate unit and thermostat
lockout LEDs will illuminate. The compressor, loop pump, hot
water pump, and accessory outputs are de-energized. The
blower will continue to run on low speed. If the thermostat
calls for heating, emergency heat operation will occur.
Lockout modes can be reset at the thermostat after turning
the unit off, then on, which restores normal operation but
keeps the unit lockout LED illuminated. Interruption of power
to the unit will reset a lockout without a waiting period and
clear all lockout LEDs.
High Pressure
This lockout mode occurs when the normally closed safety
switch is opened momentarily (set at 600 PSI).
Low Pressure
This lockout mode occurs when the normally closed low
pressure switch is opened for 30 continuous seconds (set at
40 PSI).
Freeze Detection (Water Flow)
This lockout mode occurs when the freeze detection
thermistor temperature is at or below the selected point (well
30°F or loop 15°F) for 30 continuous seconds.
Summary of Contents for 2GN Series
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