Westinghouse WBCETNG1000, Руководство пользователя, Страница: 32 / 74

WHL-038 Rev. 1.29.16
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D. 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.
Westinghouse offers an Alarm System Kit (part #
7350P-602).
E. 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 22.
2. Connect all low voltage field devices to the low
voltage terminal strip located in the electrical
junction box.
pump draw of 2 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 4 (DHW HOT), 5
(DHW NEUT), 6 (DHW GND). The connections
shown are suitable for a maximum continuous
pump draw of 2 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.
F. Thermostat
1. Connect the room thermostat to the terminals marked 14
and 15 (THERMOSTAT) in the electrical junction box (shown
in Figure 22). 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.
G. 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 12 and 13 (OUTDOOR SEN, shown in Figure
22) in the electrical junction box. Caution should be used to
ensure neither of these terminals becomes connected to ground.
Figure 22 - Control Wiring
H. 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
tank sensor is used, the control will automatically detect its
presence and a demand for heat from the indirect water heater
will be generated when the tank temperature falls below the
user selected set point by more than the user selected offset.
The demand will continue until the sensor measures that the
indirect water heater temperature is above the set point.
2. Connect the indirect tank sensor (7250P-325) to the
terminals marked 10 and 11 (DHW SENSOR, shown in Figure
22) in the electrical junction box.
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.