Field Wiring; Line Voltage Connections; Low Voltage Connections - Lochinvar Knight WHN055 Installation & Operation Manual

8

Field wiring

ELECTRICAL SHOCK HAZARD – For your
WARNING
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.
This boiler is equipped with a feature that
NOTICE
saves energy by reducing the boiler water
temperature as the heating load decreases.
This feature is equipped with an override,
which is provided primarily to permit the use
of an external energy management system
that serves the same function. This override
MUST NOT be used unless at least one of the
following conditions is true:
1. An
system is installed that reduces the
boiler water temperature as the heating
load decreases.
2. This boiler is not used for any space
heating.
3. This boiler is part of a modular or
multiple boiler system having a total
input of 300,000 Btuh/hr or greater.
4. This boiler is equipped with a tankless
coil.
Label all wires prior to disconnection when
CAUTION
servicing controls. Wiring errors can cause
improper and dangerous operation.
Figure 8-1 Remove Bezel
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.
52
external energy management
REMOVE BEZEL
Installation & Operation Manual

Line voltage connections

1. Remove bezel as shown in FIG. 8-1.
2. Connect 120 vac power wiring to the line voltage terminal
strip in the junction box, as shown in FIG. 8-2.
3. Provide and install a fused disconnect or service switch
(15 amp recommended) as required by the code (see
FIG. 8-2).
4. Wire the boiler pump as shown in FIG. 8-2.
5. When connecting a domestic hot water (DHW) pump,
connect the wiring to the line voltage terminal strip as
shown in FIG. 8-2.
6. To activate a system pump, wire as shown in FIG. 8-2. If
the motor is larger than 1/8 hp or 1.8 amps, you must isolate
with a relay.
Figure 8-2 Line Voltage Field Wiring Connections

Low voltage connections

1. Route all low voltage wires through the knockouts 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. 8-4 on page 55 of this manual and the
boiler wiring diagram.
Figure 8-3 Routing Field Wiring
LOW VOLTAGE
CONNECTION
BOARD
LOW VOLTAGE
KNOCKOUTS
LINE VOLTAGE
JUNCTION BOX
LINE VOLTAGE
KNOCKOUTS
IMG00164