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RT-SVD03L-EN 107
Table 76. Thermostat signals (continued)
O Switchover valve On = cooling,
Off = heating
T Bias for heat anticipation for
those mechanical thermostats
that use this function
Table 77. Conventional thermostat – gas/electric,
electric heat
Input/connection Function when energized
G (fan) Fan runs continuously except
during unoccupied mode (see
next page)
Y1 (compressor 1 or
economizer) Compressor #1 runs or
economizer operates
Y2 (compressor 2 or
compressor 1 while
economizing) Compressor #2 also runs, or
#1compressor runs while
economizing
W1 (gas / electric heat first
stage) 1st stage heat
W2 (gas / electric heat 2nd
stage) 2nd stage heat (if available)
Table 78. Conventional thermostat – heat pump
Input/connection Function when energized
Cooling mode:
G (fan)
Fan runs continuously except
during unoccupied mode (see
next page)
O (reversing valve during
cooling)
Reversing valve in cool mode
Y1 + O (first stage cooling)
Compressor #1 runs or
economizer operates
Y1 + Y2 + O (2nd stage cool)
Compressor #2 also runs, or
#1 compressor runs while
economizing.
Heating mode:
G (fan)
Fan runs continuously except
during unoccupied mode (see
below)
Y1 (both compressors 1st
stage heat)
(a)
Both compressors run
Y2 (during heating – nothing
happens)
No change
W2 (electric heat 2nd stage) 2nd stage (electric) heat
X2 (electric heat only)
Electric heat only – no
compressors
(a) For units configured with 2-step mechanical heating (Odyssey™
Independent Circuit Heat Pump), Y1 will correspond to a request for
Compressor 1 operation and Y2 will correspond to a request for
Compressor 2 operation.
T T:: provides heat anticipation signal for those
mechanical thermostats that use this feature. If the
thermostat used does not have a “T” terminal,
disregard this terminal.
U Un no occccu up piie ed d m mo od de e:: If the thermostat being used is
programmable, it will have its own strategy for
unoccupied mode and will control the unit directly. If a
mechanical thermostat is being used, a field applied
time clock with relay contacts connected to J6-11 and
J6-12 can initiate an unoccupied mode as follows:
• C Co on ntta accttss o op pe en n:: Normal occupied operation.
• C Co on ntta accttss ccllo osse ed d:: Unoccupied operation as follows
- Fan in auto mode regardless of fan switch
position. Economizer closes except while
economizing regardless of minimum position
setting.
Cooling/Economizer Operation
If unit does not have an economizer, the Cool/Econ
Stage 1 and Stage 2 will call directly for mechanical
cooling (compressor) stages. If the unit has an
economizer, the Cool/Econ stages will function as
follows:
Table 79. Cooling/economizer operation with
thermostat
OK to
Econo-
mize
Thermo-
stat Y1
Call for
Thermo-
stat Y2
Econo-
mizer
Cooling
Compressor
Staging
Request
No On Off Inactive
Compressor
Output 1
No Off On Inactive
Compressor
Output 2
No On On Inactive
Compressor
Outputs 1 & 2
Yes On Off Active Off
Yes Off On Active Off
Yes On On Active
Compressor
Output 1
Notes:
1 . 40 to 50 ton CV only.
2 . This unit has 3 stages of cooling if using a zone sensor or
binary inputs.
3 . Y1 = 1st stage, Y1 + Y2 = 3rd stage
4 . Thermostat inputs are ignored on VAV units.
O Op pe erra attiio on n w wiitth h a a C Co on nv ve en nttiio on na all T Th he errm mo osstta att ((C Co on nsstta an ntt V Vo ollu um me e))