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Connection Point, labeled J3 in Figure 22. DO NOT REMOVE
THIS PLUG! Doing so will affect boiler operation and void
warranty.
1. Connect the incoming power wiring to the line voltage
terminal strip in the electrical junction box at terminals 120V,
Neutral, Ground (shown in Figure 22).
2. A line voltage fused disconnect switch may be required,
externally mounted and connected according to local codes that
may apply.
3. Connect the boiler pump as shown in Figure 22 to the terminals
marked 1 – (HOT), 2 – (NEUT), and 3 – (GND). The connections
shown are suitable for a maximum continuous pump draw
of 3 amps at 120 volts. If the pump requires more current or
voltage than the 120 volts supplied, an external motor starter or
contactor will be required.
E. Alarm Connections
The control includes a dry contact alarm output. This is an SPDT
circuit, rated at 5 amps at 120 volts. This contact can be used to
activate an alarm light or bell or notify a building management
system if the boiler goes into a lockout condition. The circuit
between the ALARM COM and NC terminals is closed during
normal operation and the circuit between ALARM COM and NO
is open during normal operation. The connections
depicted in Figure 22 show two 120 volt lights
connected to the alarm terminals. One light will
be on when the boiler is in normal mode and the
other light will be on when the boiler is in lockout
mode.
F. Low Voltage Connections for Standard
Boiler
1. All low voltage cables should enter the electrical
junction box through the provided knock out
holes as shown in Figure 21.
2. Connect all low voltage field devices to the low
voltage terminal strip located in the electrical
junction box.
G. Thermostat
1. Connect the room thermostat to the terminals
marked THERMOSTAT in the electrical junction
box (see Figures 22 and 24). Alternately, any dry
contact closure across these terminals will cause
the boiler to run. Take caution to ensure neither
of the terminals becomes connected to ground.
2. Mount the thermostat on an inside wall as
central as possible to the area being heated, but
away from drafts or heat producing devices such
as television sets that could influence the ability
of the thermostat to measure room temperature.
3. If the thermostat is equipped with an
anticipator and it is connected directly to the
boiler, the anticipator should be set at .1 amps.
If the thermostat is connected to other device(s),
the anticipator should be set to match the power
requirements of the device(s). See the instruction
manual of the connected device(s) for further
information.
H. Outdoor Sensor
There is no connection required if an outdoor
sensor is not used in the installation.
WHL-052 Rev. 4.28.16
1. Use a minimum 22 AWG wire for runs of 100 feet or less and
minimum 18 AWG wire for runs of up to 150 feet.
2. Mount the outdoor sensor on an exterior surface of the
building, preferably on the north side in an area that will not
be affected by direct sunlight and will be exposed to varying
weather conditions. NOTE: For correct mounting procedures,
follow instructions provided with the sensor.
NOTE: For correct mounting procedures, follow instructions
provided with the sensor.
NOTE: If sensor wires are located in an area with sources
of potential electromagnetic interference (EMI), the sensor
wires should be shielded, or the wires routed in a grounded
metal conduit. If using shielded cable, the shielding should be
connected to the common ground of the boiler.
I. Indirect Sensor
There is no connection required if an indirect water heater is not
used in the installation.
1. The boiler will operate an indirect fired water heater with
either a thermostat type aquastat installed in the indirect tank
or an Westinghouse 7250P-325 tank sensor. When a tank sensor
is used, the boiler control will automatically detect its presence
Figure 22 - Control Wiring
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