Sequence Of Operation - Trane 5 Series Service Facts

SEQUENCE OF OPERATION FOR GAM5 AIR HANDLERS
GAM5 Sequence of Operation:
Abbreviations
See unit, electric heat, and field wiring diagrams for
additional information.
Continuous Fan
IMPORTANT: If the indoor air exceeds 60% relative
humidity or simply feels uncomfortably humid, it is
recommended that the indoor fan only be used in the
AUTO mode.
1. R-G contacts close on comfort control sending
24VAC to the G terminal on the fan relay
2. Low speed contacts close in the fan relay and send
24VAC on terminal labeled "LOW'.
3. Blower motor will now run on low speed. Speed is
field selectable.
Single Stage Heat Pump OD (cooling)
1. R-Y contacts close on the comfort control sending
24VAC to the Y terminal on the fan relay and the Y
in the outdoor unit.
2. R-G contacts also close on the comfort control
sending 24VAC to the G terminal on the fan relay.
(The combination of 24VAC on terminals Y and G
on the fan relay will close the high speed contacts
of the fan relay)
3. R-O contacts on the comfort control close sending
24VAC to the O terminal on the switch over valve
in the outdoor unit.
4. The blower motor will now run on high speed.
Speed is field selectable.
Two Stage Heat Pump OD (cooling)
1) R-Y1 contacts close on the comfort control sending
24VAC to Y1 at the outdoor unit.
2) R-G contacts close on the comfort control sending
24VAC to the G terminal of the fan relay. (G only
will run the fan on low stage setting)
3) R-O contacts close on the comfort control sending
24VAC to O on the switchover valve in the outdoor
unit.
4) R-Y2 contacts close on the comfort control sending
24VAC to Y2 at the outdoor unit. 24VAC is also
sent to the Y terminal on the fan relay. The combi-
nation of 24VAC on terminals Y and G on the fan
relay will close the high speed contacts on the fan
relay.
Single Stage Heat Pump OD (heating)
1. R-Y contacts close on the comfort control sending
24VAC to Y terminal on the fan relay and the Y in
the outdoor unit.
2. R-G contacts also close on the comfort control
sending 24VAC to the G terminal on the fan relay.
(The combination of 24VAC on terminals Y and G
on the fan relay will close the high speed con-
tacts of the fan relay) The blower motor will now
run on high speed.
3. The blower motor will now run on high speed.
Two Stage Heat Pump OD (heating)
1) R-Y1 contacts close on the comfort control send-
ing 24VAC to Y1 at the outdoor unit.
2) R-G contacts close on the comfort control sending
24VAC to the G terminal of the fan relay. (G only
will run the fan on low stage setting)
3) R-Y2 contacts close on the comfort control send-
ing 24VAC to Y2 at the outdoor unit. 24VAC is
also sent to the Y terminal on the fan relay. The
combination of 24VAC on terminals Y and G on
the fan relay will close the high speed contacts
on the fan relay.
Single Stage Cooling OD
1. R-Y contacts close on the comfort control sending
24VAC to Y terminal on fan relay and the Y in the
outdoor unit.
2. R-G contacts also close on the comfort control
sending 24VAC to the G terminal on the fan relay.
(The combination of 24VAC on terminals Y and G
on the fan relay will close the high speed con-
tacts of the fan relay)
3. The blower motor will now run on high speed
Two Stage Cooling OD
1. R-Y1 contacts close on the comfort control send-
ing 24VAC to Y1 at the outdoor unit.
2. R-G contacts close on the comfort control sending
24VAC to the G terminal of the fan relay. (G only
will run the fan on low stage setting)
3. R-Y2 contacts close on the comfort control send-
ing 24VAC to Y2 at the outdoor unit. 24VAC is
also sent to the Y terminal on the fan relay. The
combination of 24VAC on terminals Y and G on
the fan relay will close the high speed contacts
on the fan relay.
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GAM5-SF-1P-EN