Product Manual — Doc. 8622E HZ-THSTAT • 24
System Connections
Use the connections on the backplate to wire the thermostat to the HVAC system.
Connection Description
C (1) Common from HVAC system 24VAC transformer. Used to power the device.
RH (1) Reference for heat calls (W/W2) when using two separate reference
connections. Used to power the device.
R/RC (1) Reference for compressor/cooling/fan calls (Y/Y2/G/O/B). For single reference
systems where the Reference Connections switch is set to R/RC ONLY, R/RC is also
the reference for heat calls (W/W2). R/RC is also used to power the thermostat.
W (1) Heat stage call. Energized to R/RC during a call for stage 1 heat (stage 2 heat
when Radiant Floor is set to Space Heating) or aux heat 1 when Reference
Connections switch is set to R/RC ONLY. If the Reference Connections switch is set
to SEPARATE, W is energized to RH instead of R/RC ONLY.
W2 (1) Heat stage 2 call. Energized to R/RC during a call for stage 2 heat, aux heat 2, or
radiant floor when the Reference Connections switch is set to R/RC ONLY. If the
Reference Connections switch is set to SEPARATE, W2 is energized to RH instead of
R/RC ONLY.
Y (1) Compressor stage 1 call. Energized to R/RC during a call for stage 1 compressor
when the Reference Connections switch is set to R/RC ONLY.
Y2 (1) Compressor stage 2 call. Energized to R/RC during a call for stage 2 compressor
when the Reference Connections switch is set to R/RC ONLY.
O Non-FCU: (1) Changeover, active in cool mode. Energized to R/RC during cooling
modes when the Reference Connections switch is set to R/RC ONLY.;
FCU: (1) Fan call (high). Energized to R/RC during cooling modes when the
Reference Connections switch is set to R/RC ONLY.
B Non-FCU: (1) Changeover, active in non-cool modes. Energized to R/RC during non-
cooling calls when the Reference Connections switch is set to R/RC ONLY.;
FCU: (1) Fan call (medium). Energized to R/RC during cooling modes when the
Reference Connections switch is set to R/RC ONLY.
G Non-FCU: (1) Fan call. Energized to R/RC during a fan call when the Reference
Connections switch is set to R/RC ONLY.;
FCU: (1) Fan call (low). Energized to R/RC during cooling modes when the
Reference Connections switch is set to R/RC ONLY.
HUM (1) Humidistat call. Energized to HUMR during a humidity call.
HUMR (1) Reference, humidistat calls.
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