Page 37 of 84
Figure 15: Example Gas Heater Wiring Diagram - Dual Furnace
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WIRING DIAGRAM #0962I‐6294 | PROA540H6A4A | 208/230/460/575‐3‐60 | SHEET 8 OF 9 | 3/18/2016 DWN
LWF
CHK
DS
.
4
4
CN1 CN2
CN3
1
2
3
1
2
3
C
C1
C2
C3
C4
C5
C6
V
VICONICS
COM
+
‐
‐
+
**
C7
C8
1
2
3
4
ON
C
O
N
T
R
O
L
5
6
1
23
4
I
N
P
U
T
ON
DELAY (s)
TEST
RATIO (%)
BL
Y
(0843P‐0434)
R850V‐4
HR1
9
5
W
BK
0‐10VDC SIGNAL
**
SET DIP SWITCHES ON THE VICONICS CONTROL BOARD AS SHOWN BELOW:
INPUT SWITCHES #1 ‐ OFF, #2 ‐ OFF, #3 ‐ OFF, #4 ‐ ON
CONTROL SWITCHES #1 ‐ OFF, #2 ‐ OFF, #3 ‐ ON, #4 ‐ OFF
TURN THE DELAY AND RATIO POTENTIOMETER COUNTER CLOCKWISE TO MINIMUM
POSITION.
SEE PRODUCT LITERATURE FOR MORE INFORMATION.
FOR DUAL GAS FURNACE: 0‐10VDC MODULATION AND 2‐STAGE
HR1
14
13
SEE 2‐STAGE GAS
FURNACE WIRING
DIAGRAM
+
‐
SEE 0‐10VDC MODULATION,
GAS FURNACE WIRING DIAGRAM.
See ALC Page
TB1
TB1
LEGEND
ITEM FUNCTIONAL
DESIGNATION
DESCRIPTION
101
HER
HEAT ENABLE RELAY
102
T
TRANSFORMER-CLASS 2
103
TB1
TERMINAL BOARD NO. 1
104
TB2
TERMINAL BOARD NO. 2
105 VICONICS VICONICS, STEP CONTROLLER, R850V4
DUAL GAS FURNACE CONTROL
0‐10VDC MOD. & 2‐STAGE
24V CONTROL
DWN______ CKD______
11/01/13
WIRING DIAGRAM
0962I‐4848
DS
LWF
Y
W1
C
W
BL
TYPICAL SHOWN: SEE UNIT’S CONTROL
TERMINAL STRIP, SEE UNIT’S CONTROL
WIRING DIAGRAM.
T1
T2
6
BL
GY
PR
R
C
TYPICAL SHOWN: SEE UNIT’S CONTROL
TERMINAL STRIP, SEE UNIT’S CONTROL
WIRING DIAGRAM.
Maxitrol
SC40
Gnd
UO‐6
WIRE ALL SHIELD WIRES TO CLOSEST TB‐A or TB‐D
“GND” TERMINAL AT THE CONTROL PANEL
4
COM
NO
SEE 2‐STAGE GAS
FURNACE WIRING
DIAGRAM
T1
T2
6
BL
GY
PR
RLY1
RLY2
RLY3
RLY3
ALTERNATIVE
DIAGRAM FOR R851V‐4
(0843P‐0434)
R851V‐4
COM
NO
COM
NO
COM
NO
Use only one diagram
DIAGRAM FOR
R850V‐4
F6
F5
BK-14
460V
120V
H1
H4
T4
H2
H3
X3
X2
L2
L1
EGL
(SEE FURNACE WIRING DIAGRAM)
G-14
F8
F7
R-14
Y-14
R-14
GAS FURNACE POWER SUPPLY FOR 460 VOLT UNITS
1000
VA
Y-14
Class CC,
600volts,
Time Delay
GAS FURNACE
LINE VOLTAGE
TERMINALS
PDB
BK-14
BL-14
4 amps fuse
8 amps fuse
Class CC,
600volts,
Time Delay
X4
X1
BL-14
F12
F11
BK-14
460V
120V
H1
H4
T5
H2
H3
X3
X2
L2
L1
EGL
(SEE FURNACE WIRING DIAGRAM)
G-14
F14
F13
R-14
Y-14
R-14
GAS FURNACE POWER SUPPLY FOR 460 VOLT UNITS
1000
VA
Y-14
Class CC,
600volts,
Time Delay
GAS FURNACE
LINE VOLTAGE
TERMINALS
PDB
BK-14
BL-14
4 amps fuse
8 amps fuse
Class CC,
600volts,
Time Delay
X4
X1
BL-14
PR Series Installation, Operation, and Maintenance Manual
