Steffes 7140 - Manual (Page 40)

Appendix
Appendix
n
A.13 Comfort Plus Commercial Hydronic
System Low Voltage Wiring Diagram - 7130 with Variable Speed
The "R" and "C" positions in the low voltage terminal
strip may be used as a source of 24 VAC for powering
external low voltage devices (60 VA maximum).
HAZARDOUS VOLTAGE: Risk
of electric shock. Can cause
injury or death. All low voltage
wiring must be segregated
from line voltage circuits in
the system.
WARNING
M
CONTROL BOARD
M
P
M
A
YELLOW
YELLOW "R" 1
2
COR
E
C
RELAY 4
RELAY 3
RELAY 2
RELAY 1
CORE D
RELAY 7
RELAY 8
RELAY 5
RELAY 6
RELAY 12
RELAY 11
RELAY 10
RELAY 9
20V DC
20V DC
3 "R"
"Y2"
ORANGE
Relay Inputs
Outdoor Outdoor
Pump VAC
24
2
Water
P3 P2 P1
Air
P11
W/
Y1 AUX Y2
J5
Y1 Y2
RLY1
J2 D1
Blower
B
C
D P4
P5
D2
J4
J3
P6
H/E
Speed
Blower
A
O G
J6
W/E
Y1 C R
J1
P
To Control Board
P7
2 Y2 2 O RP
R
P8
C
P9
NC AP COM NO
Thermostat Peak Heat Aux.
DISCHARGE
SENSOR
AIR
DISCHARGE
(OPTIONAL
HANDLER)
AIR
SENSOR
WATER
1 YELLOW
17 BROWN
BLUE
GRAY
BLUE/BLACK
19
20
18
TO CONTROL BOARD
9
WHITE/BLACK
YELLOW/BLACK
GREEN
BLACK
WHITE
ORANGE
YELLOW
RED
13
15
16
14
11
12
10
WHITE/RED
WHITE/BLACK
YELLOW/BLACK
ORANGE/BLACK
RED/BLACK
WHITE
ORANGE
5
7
8
6
3
4
2
TO LOW VOLTAGE BOARD
19 "SC" BLUE
BLUE R
C
BLUE/BLACK "RS"
YELLOW
20
TRANSFORMER
TX1
75 VA
GROUNDED
10
11 "W" WHITE
"P" WHITE/BLACK
BROWN
GRAY
BLACK
"DS"
"OS"
"C"
YELLOW/BLACK
GREEN
YELLOW
ORANGE
"G"
"AP"
"O"
"Y"
15
17
18
16
13
14
12
"COM" WHITE/RED
RED/BLACK
RED
"RP"
"E"
WHITE/BLACK
WHITE
ORANGE
"NO"
"NC"
"O2"
7
8
9
5
6
4
75 VA
TX2
TRANSFORMER
UN-GROUNDED
BLUE
YELLOW
CORE LIMITS