Leviton omnistat 3 Directives D'installation page 15

Two Speed Heat Pump (3 Stage Heat / 2 Stage Cool)
24VAC
CONTROL
TRANSFORMER
Reversing Valve
Compressor Stage 1
Fan
Auxiliary Heat
Compressor Stage 2
CONFIGURATION
• The "System Type" must be set to "Heat Pump" under "HVAC Settings".
• The "Cool Stages" and "Heat Stages" settings must be configured under "HVAC
Settings".
POWER UP
1. Double check wiring, be sure that there are no stray wires or wire strands at the
connections.
2. Connect power to the transformer and system. The display will show the current
temperature reading.
3. Press [FAN]. The fan icon should display in the lower left-hand corner of the
display and the system fan should come on. NOTE: If "Fan Stages" have been
set to more than 1, a second icon depicting a staircase, with the first step
displayed in black will appear. Press [FAN] again to continue to Stage 2 and
Stage 3 (based on Fan Stages set in HVAC Settings).
Connections for two speed heat pump thermostat
HVAC SYSTEMS
24VAC "HOT" (RC)
24VAC Common (C)
(O/B)
(Y1)
(G)
(AUX)
(Y2)
1 2 3 4 5 6 7 8
THERMOSTAT
Figure 9
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