Installation guide

I Blower Coils Installation Instructions
Sequence Of Operation
Mode /Thermostatto Con- / Control Control Function
[trol Board 24 volt [ State
Cooling Only Unit With Electric Heat
Constant Slower
Fan Switch ON)
Cooling Only Unit
(Thermostat calls for
Cooling)
Cooling Only Unit
(Thermostat calls for
Heat)
Heat Pump
(Thermostat calls for
Cooling)
Y&G
G&Wl &W2
G On
Off
On
Off
On
Off
Y&G&O
Heat Pump Y & G
(Thermostat calls for
Heat)
Heat Pump cannot Y & G & Wl & W2
maintain proper temp.
Electric Heat Tempera-
ture satifised
Y&G&O&Wl&W2
Heat Pump
(Goes into Defrost
Mode)
Heat Pump Y & G
Room temp. satifised)
G&Wl &W2
Heat Pump
(Emergency Heat)
Fan On.
Fan Off.
Compressor On, Fan On.
Compressor Off, 60 Second Delay - Then Fan Off.
Fan On, 1st Stage Of Heat On, then 2nd Stage Of Heat On.
2rid thenlst Stage Of Heat Off. 6 sec delay, then Fan Off.
Heat Pump With
On
Off
On
On
Off
On
Off
Off
On
Off
Electric Heat
Compressor On, Reversing Valve Energized, Fan On.
Compressor Off, 60 Second Delay And Then Fan Off.
Compressor On, Fan On
1st Stage Of Heat On, then 2nd Stage Of Heat On
2rid then 1st Stage Of Heat Off
Reversing valve switches unit to cooling, 1 st Stage Of Heat
On, then 2nd Stage Of Heat On
Reversing valve switches back to heating, 2nd then ! st Stage
Of Heat Off
Compressor Off, 60 Second Delay And Then Fan Off.
Fan On, 1st Stage Of Heat On, then 2nd Stage Of Heat On.
2nd then 1st Stage Of Heat Off. 6 sec delay, then Fan Off.
NOTE: Electric Heat Elements are controlled by relays with a delay sequence from the logic board to provide sequencing between elements.
LimitOperation
The temperature limit responds to over-temperature conditions in the air duct. If the temperature limit trips, the electric heater relays will
be de-energized and the fan relay will be energized. Once the limit resets, the control will resume normal operation. If the limit trips four
times during a single call for heat, the control will go into a 1 hour soft lockout. During the soft lockout, the fan relay will respond to
thermostat inputs but the heater relays are disabled. If the control detects a limit trip during the soft lockout, the control will go into a hard
lockout. Oncein a hard lockout, thefan relayislocked on andtheheater relaysaredisabled. Turningthepowertotheunit offand then on
wil! clear this state.
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