LP-293 Rev. 9.24.15
34
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.
PLUG! Doing so will aect 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.
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 eld 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 25). 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
inuence 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.
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 aected 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
Figure 22 - Control Wiring
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 red water heater with
either a thermostat type aquastat installed in the indirect
tank or an HTP 7250P-325 tank sensor. When a tank sensor is
used, the boiler 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 set
point by more than the user selectable oset. The demand
will continue until the sensor measures that the indirect water
heater temperature is above the set point.
2. Connect the indirect sensor (7250P-325) to the terminals
marked DHW SENSOR (shown in Figures 22 and 25) in the
electrical junction box.
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