Field Wiring; Line Voltage Connections; Low Voltage Connections - Lochinvar NKC 110 Installation & Service Manual

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 8-2 Line Voltage Field Wiring Connections
48
F I R E T U B E C O M B I
Installation must comply with:
1. National Electrical Code and any other national, state,
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1,

Line voltage connections

1. Remove the cover of the metal junction box as shown in
2. Connect 120 vac power wiring using wire nuts (field
3. Provide and install a fused disconnect or service switch
4. To activate a system pump, wire as shown in FIG. 8-2. If

Low voltage connections

Wiring errors can
1. Route all low voltage wires through the holes in the bottom
2. Connect low voltage wiring to low voltage connection
DIR #2000529321 00
Figure 8-3 Routing Field Wiring
SYSTEM PUMP
(OPTIONAL)
DIR #2000536085 00
Installation & Service Manual
™
provincial, or local codes, or regulations.
and any local codes.
FIG. 8-1.
supplied) to the labeled line voltage terminal wires in the
junction box.
(15 amp recommended) as required by the code.
the motor is larger than 2 amps, you must isolate with a
relay.
front right side, just under the control panel, as shown in
FIG. 8-3.
board as shown in FIG. 8-4 on page 50 of this manual and
the boiler wiring diagram.
Do not run low voltage wires next to high
NOTICE
voltage wires in the same conduit.
LOW VOLTAGE
WIRING HOLES
LOW VOLTAGE
CONNECTION
BOARD
DIR #2000529643 00