Low voltage room thermostat connections, Two stage heat pump application, Y1 y 2 w e – Steffes 3120 Simplified Installation Guide User Manual
Page 4: Speed blower, Cb a d, Important, Yw g c, Ry c o/b g aux y2
10
LOW VOLTAGE ROOM THERMOSTAT CONNECTIONS
A 24 VAC thermostat must be used (digital recommended).
1. Disconnect power to the Comfort Plus system.
2. Route low voltage wires from the thermostat to the Comfort Plus System.
3. Insulate thermostat wire wall opening if necessary and attach thermostat to the wall. When using a mechanical
thermostat or thermostat with anticipator, resistor kit #1190015 must be installed to ensure proper operation.
4. Connect low voltage wires from thermostat into terminal block as shown.
Part No. 1200285-6
3050 Hwy 22 North w Dickinson, ND 58601-9413 w www.steffes.com
NOTE: For detailed heat call information, reference the Owner's and Installer's Manual.
11
SOFTWARE CONFIGURATION AND INSTALLERS FINAL CHECKOUT
To ensure proper operation, the system software must be configured for the application. Refer to the Configuration Menu
in the Owner's and Installer's Manual or to the Configuration Guide provided by your local power company. Also, complete the
Installer's Final Checkout Procedure found in the Owner's and Installer's Manual.
Single Stage Heat Pump Application
IMPORTANT
A
B
C
D
W / E
Y1 /
Y2
J1
J2
J3
J4
J5
J6
Blower
Speed
Stand Alone Furnace Application with Uncontrolled Air Conditioning
IMPORTANT
A
B
C
D
W / E
Y1 /
Y
2
J1
J2
J3
J4
J5
J6
Blower
Speed
Two Stage Heat Pump Application
IMPORTANT
A
B
C
D
W / E
Y1 /
Y2
J1
J2
J3
J4
J5
J6
Blower
Speed
The W/E Jumper must be installed
Ai
r
To Control Board
D4
Fid 2
Blower
C3
R1
R2
P10
D6
RLY1
P11
D5 D7 D3
Wa
te
r
W
E
Y
1
Y
2
P5
J3
J2
J1
D2
J4
D1
P6
P4
C
B
A
D
Speed
Blower
J6
J5
P3
P2
P8
P9
Air Conditioner
Connections
(If being used in the
application)
The Y1/Y2 Jumper must be installed
Y
W
G
C
TH5110D
Honeywell
R
c
R
Y
Ou
td
oor
W/
Y1
AUX
G
O
Y2
Y1
R C
H/E
2
O
2
2
Y2
COM
Ou
td
oor
NO
AP
P
RP
NC
Aux.
Peak
Inputs
Relay
C
P1
To Control Board
Comfort Plus
R
C
LV Circuit Board
P7
P8
Peak
Aux.
Inputs
Relay
The Y1/Y2 Jumper must be installed
Honeywell TH5220D
Aux
E
L
C
G O/B
R
Y
R
c
C - Low Voltage Common
R - Low Voltage Hot
O - Reversing Valve
Y - Compressor
To Heat Pump
Outdoor Sensor
The W/E Jumper must be installed
P9
H/E
R C
Ou
tdo
o
r
Ou
tdo
o
r
CO
M
NC
NO
W/
D6
RLY1
To Control Board
D4
Fid 2
Blower
To Control Board
Air
C3
P10
R1
R2
P11
D5 D7 D3
Wa
te
r
Y
1
Y
2
W
E
D2
J3
J2
J1
P5
D1
J4
P6
P4
Speed
Blower
J6
J5
C
B
A
D
P2
P3
Y1
AUX
O
G
Y2
Y1
2
Y2
2
2
O
C
R
Comfort Plus
LV Circuit Board
P7
AP
P
RP
P1
P1
ÁÂ
W/
NO
NC
CO
M
O
u
tdoor
O
u
tdoor
C
R
H/E
RLY1
D6
To Control Board
Fid 2
D4
Blower
To Control Board
O
D3
R2
R1
D7
D5
P11
W
E
Y
1
Y
2
Wa
te
r
J4
D1
ÁÃ
J1
J2
J3
P10
ÁÄ
D2
D
A
B
C
C3
J5
J6
Blower
Speed
P4
P3
AUX
Y2 G
Y1
O
2
2
Y2
Y1
Á
Ai
r
LV Circuit Board
Comfort Plus
ÁÅ
Honeywell TH5320U
R
R
Y
C
O/B
G
Aux
Y2
Y2 - Compressor Stage 2
C - Low Voltage Common
c
L
R - Low Voltage Hot
O - Reversing Valve
To Heat Pump
Y1 - Compressor Stage 1
The Y1Y2 Jumper must be removed
P2
В
БЖ
RP
2
AP
P
Aux.
Relay
Peak
Inputs
The W/E Jumper must be installed