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Remote Mounting of Sensor
You must mount the outside air temperature sensor outside the
building. To mount remote sensors, follow the guidelines
below. Take care to correctly wire sensors to the unit. Erratic
temperature readings can be caused by poor wiring practices.
Twist the wires between the unit and the remote sensor. Turn
wires at least three or four turns per linear foot of wiring. This
provides common mode rejection of some types of electrical
interferences.
1. Do not route temperature sensor wiring with building
power wiring.
2. Do not locate temperature sensor wiring next to control
contactors.
3. Do not locate temperature sensor wiring near electric
motors.
4. Do not locate temperature sensor wiring near welding
equipment.
5. Make sure good mechanical connections are made to the
sensor, any interconnecting wiring and the controller.
6. Do not mount sensor with leadwire end pointing up in an
area where condensation can occur.
7. Use shielded wiring to connect the sensor to the control
when the possibility of an electrically noisy environment
exists. Shielded cable is recommended on all cable runs of
more than 25 feet in length.
Note: Ground the cable shield at the connection to the boiler
temperature control only. Do not ground the shielded cable at
the sensor end.
To maintain temperature accuracy, sensor wires should be at
least 18 AWG, see Table N below.
HOT SURFACE IGNITION SYSTEM
Hot Surface Igniter and Ignition
Control Module
This unit has one ignition module and one hot surface igniter.
Figure 38 - Hot Surface Igniter
Figure 39 - Hot Surface Ignition Control Module
Installation and
Service Manual
33
Wire Maximum
Gauge Allowable Length
12 GA 100 ft
14 GA 75 ft
16 GA 50 ft
18 GA 30 ft
TABLE - N
Remote Wire Connection
ƽ Caution: The igniter is extremely fragile, be very
careful when removing. A faulty or damaged hot surface
igniter MUST BE replaced with a Lochinvar PLT3400
igniter. Do not use general purpose field replacement
igniters.
FC+FC-
P3
DS2
+
F2
F1