Steffes 7140 - Manual (Page 41)

System Low Voltage Wiring Diagram - 7140
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
Appendix
Comfort Plus Commercial Hydronic Appendix
n
A.14
"OS"
WATER SENSOR
18
19
17
BLUE 6
Terminals for Connection as a Stand Alone Furnace
R W C Y2 Y G
Peak Control Connections
RP COM AP P NO NC
OS W2 DS SC
BLUE/WHITE 5
BLUE/RED 8
BLUE/WHITE
BLUE/RED
BLUE/YELLOW 14
7
15
PURPLE
GRAY/WHITE
GRAY
"SC"
YELLOW
12
11
14
13
10
16
15
WHITE "W"
BLUE/YELLOW "AP"
BLACK
BROWN
BLUE/WHITE
"C"
DISCHARGE
"P"
ORANGE
GREEN
YELLOW
"O"
"G"
"Y"
7 BLUE/RED "COM"
BLUE/RED
RED
8 "RP"
"E"
9
BLUE/WHITE
BLUE
ORANGE/BLUE
5 "NO"
"NC"
6
"O2" 4
GROUNDED
75 VA
TRANSFORMER
TX1
UN-GROUNDED
YELLOW
TX2
75 VA
TRANSFORMER
TERMINAL BLOCKS
TO LOW VOLTAGE
strip may be used as a source of 24 VAC for powering
The "R" and "C" positions in the low voltage terminal
external low voltage devices (60 VA maximum)
CONTROL BOARD
M
YELLOW
YELLOW/BLUE
1 "R"
"Y2"
2
NOTE
P
M
M A
PURPLE/WHITE
"DS"
3 ORANGE "R"
CORE C
RELAY 2
RELAY 1
RELAY 4
RELAY 3
RELAY 5
20V DC
20V DC
RELAY 15
RELAY 14
RELAY 11
RELAY 10
RELAY 12
RELAY 13
CORE E
CORE D
RELAY 7
RELAY 6
RELAY 9
RELAY 8
TO Terminals for Connection with Heat Pump
GREEN 13
YELLOW AND ORANGE 1 & 3
BLACK
YELLOW
YELLOW/BLUE
11
16
2
R Y2 Y C O2 O G
9
18
WHITE
ORANGE
ORANGE/BLUE 4
12
10
RED
BROWN
GRAY/WHITE
E OS W DS SC
19
17
GRAY
BLUE
CORE LIMITS
BOARD
CONTROL
BLUE