Application Guide

5
Functio
n
Mode Zone
Dema
nd
HP
Mod
e
Operation of Unit
Off N/A 1 - 4 N/A N/A No units operating in this mode: LCD is displaying
temperature in Zone displayed. User can toggle thru
zones to see temperature in each zone (Setpoint cannot
be adjusted)
Cool Cool
Auto
1 - 4 No N/A Nothing is operating since there is no cooling demand:
LCD is displaying temperature in Zone1
Cool Cool
Auto
1 - 4 Yes N/A Compressor is energized; if 1° C above setpoint then
FAN LOW is energized If 2° C+ above setpoint, then FAN
HIGH is energized & locks in HIGH
Cool Cool
High
1 - 4 No N/A FAN HIGH is energized
Cool Cool
High
1 - 4 Yes N/A Compressor is energized; FAN HIGH is energized
Cool Cool
Low
1 - 4 No N/A FAN LOW is energized
Cool Cool
Low
1 - 4 Yes N/A Compressor is energized; FAN LOW is energized
Cool Fan
High
1 - 4 N/A N/A FAN HIGH is energized (Setpoint cannot be adjusted)
Cool Fan
Lower
1 - 4 N/A N/A FAN LOW is energized (Setpoint cannot be adjusted)
Cool Off 1 - 4 N/A N/A Nothing operational in Zone (Setpoint cannot be
adjusted)
Heat Elec 1 - 4 No Non
HP
Nothing is operating in this mode since there is no
heating demand
Heat Elec 1 - 4 Yes Non
HP
Strip heat is energized; Set FAN SPEED is energized
Heat Elec 1 - 4 No HP Nothing is operating in this mode since there is no
heating demand
Heat Elec 1 - 4 Yes HP Compressor & Reversing Valve are energized; If Indoor
Coil <25° C, Fan is Off; If 25-30°C, FAN LOW; If >30°C, Set
Fan Speed is energized
Heat Gas 1 - 4 No N/A Nothing is operating in this mode since there is no
heating demand
Heat Gas 1 - 4 Yes N/A Gas Heat is energized
Heat Off 1 - 4 N/A N/A Nothing operational in Zone (Setpoint cannot be
adjusted)
Note: Temperature Setpoints will be stored in memory for each zone in both heating & cooling modes.
ALGORITHM TO CALL FOR BACKUP MODE OF HEAT