I Modular Blower Installation Instructions/
Mode
Constant Blower
Fan Switch ON)
Thermostat calls for
Heat
Constant Blower
Fan Switch ON)
Cooling Only Unit
(Thermostat calls for
Cooling)
Cooling Only Unit
(Thermostat calls for
Heat)
Heat Pump
(Thermostat calls for
Cooling)
Sequence Of Operation
Thermostat to Con- Control | Control Function
trol Board 24 volt State
1
Electric Heat Only
G On / Fan On.
÷
Off / Fan Off.
G & W1 & W2 On / Fan On, 1st Stage Of Heat On, then 2rid Stage Of Heat On.
Off /2nd thenlst Stage Of Heat Off. 6 sec delay, then Fan Off.
Cooling Only Unit With Electric Heat
G
Y&G
G&Wl &W2
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
Heat Pump
(Goes into Defrost
Mode)
Y&G&O&Wl&W2
Heat Pump Y & G
Room temp. satifised)
G&Wl &W2
Heat Pump
(Emergency Heat)
On
Off
On
Off
On
Off
Fan On.
Fan Off.
Compressor On, Fan On.
Compressor Off, 60 Second Delay - Then Fan Off.
Fan On, 1st Stage Of Heat On, then 2rid Stage Of Heat On.
2nd thenlst Stage Of Heat Off. 6 sec delay, then Fan Off.
Heat Pump With Electric Heat
On Compressor On, Reversing Valve Energized, Fan On.
Off Compressor Off, 60 Second Delay And Then Fan Off.
On Compressor On, Fan On
On
Off
On
Off
Off
On
Off
1st Stage Of Heat On, then 2rid Stage Of Heat On
2nd then 1st Stage Of Heat Off
Reversing valve switches unit to cooling, 1st Stage Of Heat
On, then 2nd Stage Of Heat On
Reversing valve switches back to heating, 2nd then 1st 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.
Limit Operation
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
thermostatinputs buttheheater relaysaredisabled. Ifthecontroldetectsalimittripduringthesoftlockout, thecontrolwillgointoahard
lockout. Oncein a hardlockout, thefan relayislocked on andtheheater relaysaredisabled. Turningthepowertothe unit offandthen on
wil! clear this state.
To Next Page
Loading...
Need help?
General
