HTP EL-399 - Manual (Page 46)

46
LP- 293 REV. 5.20.14
3. Connect the boiler pump as shown in Figure 26 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 26
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 25.
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 Figure
26). 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.
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.
Figure 26 – LP-293-NN Elite Boiler Control