Control Board Configuration - McQuay PDAC Installation & Maintenance Data

Modes of Operation-Description
Standard Digital Touchpad Control
Heat Mode
Unit will call for heating based on the type of the heat
source it has: heat pump in reverse cycle or electric.
1) Hot Start
Hot Start is possible when the control has not called for
heat in more than (2) hours or during power-on-reset.
During Hot Start, the user's set point is raised 4°F (Ts +
4°F). The unit will only call for heat if room temperature
differential calls for heat.
The unit will continue in Hot Start Mode until the
new set point is satisfied (with a 1°F differential)
or unit has run for at least 20 minutes. After one or
both conditions are met, the set point will be reset
to the user's setting and the unit will run in regular
heat mode. Hot start is not available with the Sleep
feature. The fan will operate per the Fan Mode and
Speed setting.
2) Hot Keep
When the water valve closes, the indoor fan will operate
per the user mode (Constant or Cycle) and speed setting.
Sleep Function
Sleep time is user adjustable from 1 to 15 hours in
one (1) hour increments, in a closed loop via the touch
pad, by pressing the Sleep button repeatedly. The
Sleep Mode can be terminated by pressing the
On/Off button.
The Sleep Function will lower the temperature setting
one degree fahrenheit every half hour for two hours for
a maximum of four degrees. Changing the Mode or a
changeover from Heat to Cool will reset the Sleep Timer.
The Sleep function will be deactivated by Power-on-
reset, or by pressing any button on the Touchpad except
Sleep.
Fan Mode
In the Fan Mode, the fan will operate continuously
at the user's speed setting. The compressor and outdoor
fan will not operate. In single motor units, the outdoor
fan will run along with the indoor fan.

Control Board Configuration

To enter the Configuration Mode, simultaneously press
the Up and Down buttons for 5 seconds. To change
settings, press the Up or Down button. To move from one
screen to another, press the Mode button.
To exit Configuration Mode, press the Up and Down
buttons simultaneously for 5 seconds or control will
automatically exit in 15 seconds.
Settings within the Configuration Mode are as follows:
Temperature Scale
To view the Temperature Scale Screen, press and hold
the Up and Down buttons for 5 seconds. The temperature
scale will be displayed. The default setting is degrees
fahrenheit and by pressing either the UP or Down button
can toggle to Degree Celcius.
Temperature Limit Settings
To advance from Temperature Scale Setting, press the
Mode button once. To set the Cool Minimum set point,
press and hold Fan Cycle button and adjust the setting
with the Up or Down buttons. The minimum setting is
60°F.
To set the Heat Maximum set point, press and hold Fan
Speed button and adjust the setting with the Up or Down
buttons. Maximum setting is 85°F.
The Display will show the upper operating limits first.
The default settings are Cool min. = 60°F and Heat max.
= 85°F.
Setting The Outside Air Damper
To view Damper Setting press the Mode button once. To
adjust the damper setting (AU or CL), press the Up or
Down button. AU is the abbreviation for Automatic as
CL is the abbreviation for Closed.
Sensor Readings
By pressing the Mode button repeatedly from the
previous screen, the following will be displayed in
sequence:
• Indoor Air Sensor Reading
• Indoor Coil Sensor Reading
• Outdoor Air Sensor Reading
• Outdoor Coil Sensor Reading
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