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3.10 Outdoor Sensor (P/N 10081500) Placement
The outdoor sensor measures air temperature out-
side the building. It is important that the sensor is
located on the outside of the building on the north
facing wall. Failure to mount the sensor on the north
facing wall will result in artificially high temperature
readings and failure to modulate as designed. If pos-
sible, locate the sensor high under an eve to prevent
incorrect readings from direct sunlight and damage
due to the elements.
FIGURE 12: Outdoor Sensor Placement
Mount the outside sensor with the sensor module
facing down to prevent accumulation of dirt or water.
3.11 Outside Air Supply (P/N 90707501K)
If an outside air (O.A.) blower is to be used, modifica-
tions to the outside air blower out-of-box wiring must
be made to properly time, and safety check the
blower with the main pump. See Page 28, Figure 15
and Page 34, Figure 18 for external wiring details.
Remove the internal connection between the pres-
sure switch (P.S.) and the relay and wire the P.S. of
the O.A. Blower in series with that of the main pump.
Send 24V from Terminal Block 2 in the controller to
terminals T1 and T2 in the O.A. Blower. Power the
blower with its own 120V, 15A, 60Hz supply. See
Page 28, Figure 15 through Page 34, Figure 18 for
wiring.
North
Outside
Sensor
Sensor
Module
facing down
SECTION 3: I
NSTALLATION
21
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