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8
Field wiring
For field wiring on Combi units, reference
NOTICE
the Combi Installation and Service
Manual provided with the unit.
ELECTRICAL SHOCK HAZARD – For
⚠WARNING
your safety, turn off electrical power
supply before making any electrical connections to avoid
possible electric shock hazard. Failure to do so can cause
severe personal injury or death.
Wiring must be N.E.C. Class 1.
NOTICE
If original wiring as supplied with boiler
must be replaced, use only type 105°C wire or equivalent.
Boiler must be electrically grounded as required by National
Electrical Code ANSI/NFPA 70 – latest edition.
Label all wires prior to disconnection when
⚠CAUTION
servicing controls.
cause improper and dangerous operation.
Figure 8-1 Remove Metal Junction Box Cover
Wall hung
HIGH VOLTAGE
JUNCTION BOX
54
Wiring errors can
DIR #2000529321 00
Floor standing
HIGH VOLTAGE
JUNCTION BOX
Installation & Service Manual
™
F I R E T U B E
Figure 8-2A Line Voltage Field Wiring Connections_Boiler
Only
OR
BR
PR
W
BK
Note: Boiler pump is not optional on boiler models.
Figure 8-2B Line Voltage Field Wiring Connections_
Combi Only
FROM
UNIT
SYSTEM PUMP
120V OUTPUT
PR
UNIT
GROUND
G
UNIT
NEUTRAL
W
120V
LINE TO
UNIT
BK
DIR #2000536085 00
Installation must comply with:
1. National Electrical Code and any other national, state,
provincial, or local codes, or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1,
and any local codes.
Line voltage connections
1. Remove the cover of the metal junction box as shown in
FIG. 8-1.
2. Connect 120 vac power wiring using wire nuts (field
supplied) to the labeled line voltage terminal wires in the
junction box.
3. Provide and install a fused disconnect or service switch
(15 amp recommended) as required by the code.
2000620198 00
4. Boiler Only: Wire the boiler pump as shown in FIG. 8-2A.
When connecting a Domestic Hot Water (DHW) pump,
connect the wiring as shown in FIG. 8-2A.
5. To activate a system pump, wire as shown in FIG.'s 8-2A
and 8-2B. If the motor is larger than 2 amps, you must
isolate with a relay.
JUNCTION
BOX
BOX DEPICTS
OPTONAL ITEMS
DHW
G
PUMP
G
BOILER
PUMP
SYSTEM
G
PUMP
L
120V
GND
SUPPLY
N
FIELD
JUNCTION
WIRING
BOX
BOX DEPICTS
OPTONAL ITEMS
L
N
G
GND
120V
FIELD
N
SUPPLY
L
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