Aps / Burner Overheat Limit / Condensate Block Switch; Dhw / Op / Ch Overheat / Exhaust Overheat Sensors; Outdoor Temperature Mode (Optional) - Westinghouse WBRC 140W Series Installation Manual

Gas fired residential combi boiler

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3. APS / BURNER OVERHEAT LIMIT / CONDENSATE BLOCK SWITCH

Figure 49 – APS / Burner Overheat Limit / Condensate Block Switch Error Analysis Tree

Figure 50 – DHW / OP / CH Overheat / Exhaust Overheat Sensors Error Analysis Tree

L. OUTDOOR TEMPERATURE MODE (OPTIONAL)

NOTE: If the system requires a fixed operating temperature, the outdoor sensor is not required and should not be installed.

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: 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 appliance.

NOTE: Outdoor Temperature Mode Icon on the display will flash if an Outdoor Sensor or 0-10 Volt is not connected to the appliance.

See Figure 51 to set your Outdoor Reset Curve.

To check the CH Target Temperature while using Outdoor Temperature Mode, press the

button while the appliance is operational

and the display panel is powered on.

WHL-012 REV. 4.8.16

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