HTP 850 LPHL - Manual (Page 40)

40
LP- 205 REV. 3.28.14
D. ALARM CONNECTIONS
The Mod Con 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 turn on when the
boiler is in lockout mode.
E. LOW VOLTAGE CONNECTIONS FOR
STANDARD BOILER
1. All low voltage cables should enter the electrical
junction box through the provided knock out holes
shown in Figure 22.
2. Connect all low voltage field devices in the low
voltage terminal strip located in the electrical junction
box (shown in Figure 23).
F. 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 Mod Con 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 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.
H. INDIRECT SENSOR
NOTE: There is no connection required if an indirect water heater is not used in this installation.
Figure 23 – Boiler Control Wiring