Install and Operating Manual

Mighty Therm2
Page 25
Figure 21. Mighty Therm2 (1250–2000) Connection Diagram.
5 34
6 8 7 2
24V
G-GREEN COLOUR LEGEND BK-BLACK
W-WHITE R-RED Y-YELLOW BL-BLUE BR-BROWN O-ORANGE GR-GREY
WIRING
24V
120V
OPTIONAL WIRING
P-PURPLE
STAGE 2
AQUASTAT
STAGE 1
TRANSFORMER
120V
24V
5 34
6 8 7 2
WIRES NOT INSTALLED
JUMPER ONLY INSTALLED ON PUMP MOUNTED UNITS (1250 & 1500).
ON PUMP MOUNTED UNITS.
REMOVE JUMPERS FOR SEPARATE PUMP POWER SOURCE (L2/N2)
G
R
BL
Y
BLOWER 2
BLOWER 1
BK/W
Y Y
P
SWITCH
P/W
O/R
PROOF
OF F A N #2
BL/W
R/B K
DPDT SWITCH
LOCAL/REMOTE
BK/W
STAGE 2 STAGE 1
RELAY 1
RELAY 2
BL/R Y
BR/R HIGH
BL/R LOW
W N
G
BR/B K
BL/BK Y
BR/R
W/BK N
BR/BLK HIGH
BL/BK LOW
G
BR/R
Y/BK
LIGHT
INP U T STAGE 2
STAGE 2
STAGE 1
2 1
Gas Valve
BL
BK
W
BL/BK
HIGH
GAS
BK/W
L2
N2
BK/W
L2 LOAD
1 1
2 3 4 5 6 7
8 9 10 10
lockout indicator
T-stat lockout indicator (G)
Pressu re S
witch
Gas Valve
24V
Ground
Remote Sense
S1 L1
L2 S2
Fenwal
F1 F2
lockout indicator
T-stat
lockout indicator (G) Pressu re S w itch
Gas Valve
24V Ground
Remote Sense
S1 L1
L2 S2
Fenwal
F1
F2
1
2 3
4
5 6 7 8 9
10
11 12
MAIN
P O W ER
Fuse
OPTIONAL LW CO
2 1
P1
P2
LOW GAS
BLOCK
FLUE
Gas Valve
PROOF OF FAN
FLOW SWITCH
FIE L D L1
FIE L D N FIE L D G
2
4
6
3 1
RELAY,
DELAY
ON B R EAK
PUMP
FIE L D INTE R LO C K
BELL
ALARM SILENCE
LIGHT
ALARM
DRY
CONTACT
R
MANUAL
RESET
HIGH LIMIT
Y Y
BL
BL
BL
BL
Y
BK/W
W
BK/W B K
BK
BK/W
BK W
W/BK
W
W
G
BK
G
GR/B K
GR
GR/B
K
GR
BK W
BL/R
BL/R
BL
BL/W
P/W
GR/P
W/PP
BR/B K
BL/B K
Y/B K
BR/R
Y/R
BL
BL
BL B L /W R/BK
O
O
Y Y
BL
BL
Y
BL BL
O/R
G
BL/R
BR/R
GR/R
P/R
G
BL/B K
BR/B K GR/B K
P/B K
R/B K
O/B K
O/B K
(G R /W)
GR
GR/R
INP U T STAGE 1
AUTO
RESET
HIGH LIMIT
OPTIONAL
R
ALARM
ALARM
BLOCK 1
TERMINAL
6 5 4 3 2
1
G
BK
W
BL/R
BL/B K
R
BK
R/W
G
R/B K
BL
BK
BR/B K
BK
BR/R
G
W
W/BK
H2329000F