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are provided for trouble-free cascade system wiring using
standard CAT3 or CAT5 patch cables.
D. Line Voltage Wiring for Standard Boiler
NOTE: A termination plug is included in the CAT 3 / CAT 5 Bus
Connection Point, labeled J3 in Figure 23. 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 LINE
120V, Neutral, and Ground (shown in Figure 23).
2. A line voltage fused disconnect switch may be required
to be externally mounted and connected according to local
wiring codes.
3. Connect the central heating pump to the terminals
marked BOILER HOT, BOILER NEUT, and BOILER GRD. 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 other than the 120 volts supplied, an
external motor starter or contactor will be required.
4. If using DHW, connect the domestic hot water pump to the
terminals marked DHW HOT, DHW NEUT, DHW GND. The
connections shown are suitable for a maximum continuous
pump draw of 3 amps at 120 volts. If a 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 23 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 23.
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 (shown in Figure
23). Alternately, any dry contact closure across these terminals
will cause the boiler to run. Caution should be taken to ensure
neither of the terminals becomes connected to ground.
2. Mount the thermostat on an inside wall as centrally 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 devices, the
anticipator should be set to match the power requirements of
the device it is connected to. See the instruction manual of the
connected devices for further information.
WHL-033 Rev. 1.29.16
Figure 23 - Control Wiring
H. Outdoor Sensor
NOTE: There is no connection required if an outdoor sensor is
not used in this installation.
1. If using an outdoor sensor, connect wires for sensor to the
terminals marked OUTDOOR SEN (shown in Figure 23) in
the electrical junction box. Caution should be used to ensure
neither of these terminals becomes connected to ground.
2. 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.
3. 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.
I. Indirect Sensor
NOTE: There is no connection required if an indirect water
heater is not used in this 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
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