54
LP-542 REV. 7.16.15
3. APS / BURNER OVERHEAT LIMIT / CONDENSATE BLOCK SWITCH
Figure 45 – APS / Burner Overheat Limit / Condensate Block Switch Error Analysis Tree
4. STORAGE / OP / CH OVERHEAT / EXHAUST OVERHEAT SENSORS
Figure 46 – DHW / OP / CH Overheat / Exhaust Overheat Sensors Error Analysis Tree
J. 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 boiler.
NOTE: Outdoor Temperature Mode Icon on the display will flash if an Outdoor Sensor or 0-10 Volt is not connected to the boiler.
See Figure 47 to set your Outdoor Reset Curve.
To check the CH Target Temperature while using Outdoor Temperature Mode, press the button while the boiler is operational and
the display panel is powered on.
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