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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
HIGH VOLTAGE
JUNCTION BOX
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
54
Wiring errors can
DIR #2000529321 00
JUNCTION
BOX
BOX DEPICTS
OPTONAL ITEMS
DHW
G
PUMP
G
BOILER
PUMP
SYSTEM
G
PUMP
L
120V
GND
SUPPLY
N
JUNCTION
FIELD
BOX
WIRING
SYSTEM PUMP
(OPTIONAL)
DIR #2000536085 00
Installation & Service Manual
™
F I R E T U B E
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.
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.
Low voltage connections
1. Route all low voltage wires through the holes in the bottom
front right side, just under the control panel, as shown in
FIG. 8-3.
2. Connect low voltage wiring to low voltage connection
board as shown in FIG.'s 8-4 and 8-5 on pages 56 and 57
of this manual and the boiler wiring diagram.
Do not run low voltage wires next to high
NOTICE
voltage wires in the same conduit.
Figure 8-3 Routing Field Wiring
LOW VOLTAGE
WIRING HOLES
LOW VOLTAGE
CONNECTION
BOARD
DIR #2000529643 00
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