IM 934-5
Page 27 of 48
The Display will show the upper operating limits first. The
default settings are Cool min. = 60°F and Heat max. = 85°F.
4) Fresh Air Damper Control
To advance from Heat Maximum Set point, to Fresh Air
Damper Control operation, press the Mode button once.
Using the Up and Down buttons, toggle between "AU"
for Automatic and "CL" for (forced) Closed.
The Fresh Air Damper will operate when the following
conditions are met:
A. Damper setting in the touchpad set-up mode is “AU”
(automatic) AND
B. Indoor fan motor turns on AND
C. Outdoor Air Sensor (OAS) temperature is greater than
40ºF but less than 90ºF AND
D. Indoor Air Sensor (IAS) temperature greater than 50ºF.
This control can be overridden by changing the damper set-
ting in the set-up mode to “CL” (Close).
Optional Indoor Air Quality Boost Fan
The IAQ Boost Fan will operate in conjunction with the
Fresh Air Damper
and increase the volume of fresh air to
90 CFM. The Fresh Air Damper and Boost Fan will operate
when the following conditions are met:
A. Damper setting in the touchpad set-up mode is “AU”
(automatic) AND
B. Indoor fan motor turns on AND
C. Outdoor Air Sensor (OAS) temperature is greater than
40°F but less than 90°F AND
D. Indoor Air Sensor (IAS) temperature greater than 50°F.
This control can be overridden by closing the damper and
turning off the Boost Fan, by changing the damper setting in
the Set-up Mode to “CL” (Close).
5) Indoor Air Sensor Reading
To advance from Fresh Air Damper Control, Heat pump
or Electric Heat operation to Indoor Air Sensor Reading,
press the Mode Button once. The display will show
return air temperature.
6) Indoor Coil Sensor Reading
To advance from Indoor Air Sensor Reading to Indoor
Coil Sensor Reading, press the Mode Button once. The
display will show the indoor coil sensor temperature.
Figure 36: Indoor Air and Indoor Coil Sensor Locations
Indoor Coil
Sensor (ICS)
Indoor Air
Sensor (IAS)
7) Outdoor Air Sensor Reading
To advance from Indoor Coil Sensor Reading to Outdoor Air
Sensor Reading, press the Mode Button once. The display
will show the Outdoor Air Sensor temperature.
8) Outdoor Coil Temperature Reading
To advance from Outdoor Air Sensor Reading to Outdoor
Coil Temperature Reading, press the Mode Button once. The
display will show the Outdoor Coil termperature.
Figure 37: Outdoor Air Sensor Location
Outdoor Air Sensor
(OAS)
Thermistor Error Codes and
Conditions
Refer to
"Fault and Protection Codes for Applied PTAC
Control Board" on page 42
The system treats a sensor open or short as extremely cold
or hot and reacts accordingly. The exception is the room air
sensor, in which case the system will turn off. When the fault
is corrected by replacement or repair, the respective error
code will clear from the display (
Table 2
).
Table 2: Failure Code and Condition
Thermistor Sensor
Condition
Error Code
< - 58°F or
Room
> 140°F or
E1
Open or Close
< - 50°F for > 2s or
Indoor Coil
> 176°F for > 2s or
E2
Open or Close
< - 50°F for > 2s or
Outdoor Air
> 176°F for > 2s or
E4
Open or Close
Compressor Random Restart
When power is interrupted, a random compressor restart
delay of 0 to 2 minutes is initiated. In the Cool Mode only,
the compressor will start operating only after the random
delay plus 3 minutes (minimum off time for thermostat, ie.
2 to 5 minutes). Random delay is used only during system
startup or reset.
Summary of Contents for McQuay IM 934-5
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