IM 1227 • MODELS DC THERMOSTATS 20 www.DaikinApplied.com
7-Day Programmable CommerCial DigiTal ThermosTaTs
Sample Wiring Diagrams
Table 5: Conventional Heating and Cooling Systems
3 Wire, Heat Only
Residential & Commercial 1 Stage Heating with no Fan.
R 24VAC Power
C 24VAC Common
W1/O/B 1st Stage Heat
J1 = Gas/Elec
J2 = O (not used)
J3 = Gas
4 Wire, Cool Only
Residential & Commercial 1 Stage Cooling.
R 24VAC Power
C 24VAC Common
Y1 1st Stage CoolG Fan
J1 = Gas/Elec
J2 = O (not used)
J3 = Gas
5 Wire, 1 Stage Cooling, 1 Stage Heat
Residential & Commercial 1 Stage Cooling, with 1 stage Gas Heat.
R 24VAC Power
C 24VAC Common
W1/O/B 1st Stage Heat
Y1 1st Stage Cool
G Fan
J1 = Gas/Elec
J2 = O (not used)
J3 = Gas
5 Wire, 1 Stage Cooling, 1 Stage Heat
Residential & Commercial 1 Stage Cooling, with 1 stage Electric Heat.
R 24VAC Power
C 24VAC Common
W1/O/B 1st Stage Heat
Y1 1st Stage Cool
G Fan
J1 = Gas/Elec
J2 = O (not used)
J3 = Electric
8 Wire, 2 Stage Cooling, 3 Stage Heat
Residential & Commercial 2 Stage Cooling, with 3 stage Gas Heat
R 24VAC Power
C 24VAC Common
W1/O/B 1st Stage Heat
W2 2nd Stage Heat
W3 3rd Stage Heat
Y1 1st Stage Cool
Y2 2nd Stage Cool
G Fan
J1 = Gas/Elec
J2 = O (not used)
J3 = Gas
Table 6: Heat Pump Systems
5 Wire, 1 Stage Cooling, 1 Stage Heat
Residential & Commercial Heat Pump with‘O’ Reversing Valve
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
Y1 1st Stage Compressor (Cool or Heat)
G Fan
J1 = Heat Pump
J2 = O
J3 = Gas
6 Wire, 1 Stage Cooling, 2 Stage Heat
Residential & Commercial Heat Pump with ‘O’ Reversing Valve
R 24VAC Power
C 24VAC Common
W1/O/BY1 Reversing Valve
W2 Aux Heat
G Fan
J1 = Heat Pump
J2 = O
J3 = Electric
7 Wire, 2 Stage Cooling, 3 Stage Heat
Residential & Commercial Heat Pump with ‘O’ Reversing Valve.
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
W2 3rd Stage Heat
Y1 1st Stage Compressor (Cool or Heat)
Y2 2nd Stage Compressor (Cool or Heat)
G Fan
J1 = Heat Pump
J2 = O
J3 = Electric
Setup Step 26 is set to 2 (Number of Compressor Stages)
8 Wire, 2 Stage Cooling, 4 Stage Heat
Residential & Commercial Heat Pump with ‘O’ Reversing Valve.
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
W2 3rd Stage Heat
W3 4th Stage Heat
Y1 1st Stage Compressor(Cool or Heat)
Y2 2nd Stage Compressor(Cool or Heat)
G Fan
J1 = Heat Pump
J2 = O
J3 = Electric
Setup Step 26 is set to 2(Number of Compressor Stages)
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