Cool Mode; Modes Of Operation-Description - McQuay PDAC Installation & Maintenance Data

Controls
Standard Digital Touchpad Control
System Select Operation Using Remote
Thermostat
System will run in Heat mode and engage certain outputs
based on the system selection (jumper) as described
below (see Premium Digital Control Board Wiring
Diagram on page 29).
Notes:
1. Hot start and Sleep features are not available in Remote T'stat
heat mode.
2. Control's operation is subject to its own protection features when
controlled by a remote thermostat.
3. Indoor fan mode and the speed will default to "cycle" and
"high" when unit is controlled by remote thermostat.
4. The indoor fan is turned on when G signal is high. When there
is no signal on G terminal then the indoor fan will be turned off.
Control Lockout Feature
The control is placed in a lockout mode of operation
when Mode button is held pressed for 10 seconds.
Display will show "LC" to confirm Lockout Mode has
been entered. Once in this Lockout Mode the control
board will not take any commands at all. In Lockout, unit
will continue to operate with the settings just prior to
Lockout Mode. This means the touchpad will no longer
be able to pass commands to the control. User's set point
will normally be displayed. Any button pushed will bring
"LC" on display for five seconds.
To exit the Lockout Mode and return to normal (regular)
mode of operation, press the Mode button for 10
seconds. Display will show "nL" for five seconds to
confirm normal mode has been resumed.

Modes of Operation-Description

Standard Digital Touchpad Control

Cool Mode

In Cool Mode, the compressor will start if the
temperature at the space temperature sensor is 1°F
or higher than the set point. It will stop if the space
temperature sensor is 2°F or lower than the set point,
subject to timing requirements.
In the Cool Mode, the indoor fan will operate according
to the user settings for Fan Mode – Continuous or Cycle
and Speed.
Cold Start
Cold start is initiated when the control has not called
for cooling for more than two (2) hours or during
a power-on-reset. During cold start, the set point is
lowered by 4°F (Tset-4°F) if the differential calls for
cooling. The unit will operate in cold start until the new
set point is satisfied (+ or – 1°F) or until the unit has run
in cold start for at least 20 minutes. After one or both
conditions are met, the set point will be reset to the user
setting and the unit will run in the regular cool mode.
The indoor fan will operate according to the user settings
for mode – Continuous or Cycle and Speed.
Cold start is not available with the Sleep feature.
Sleep Function
Sleep time is adjustable by the user from 1 to 15 hours in
one (1) hour increments in a closed loop. The sleep time
is adjusted and set via the touchpad and by pressing the
Sleep Button repeatedly. On the touchpad, the display
will show the set time in numbers for five (5) seconds.
Before the sleep time expires, the setting can be adjusted
above the number of hours passed by pressing the Sleep
Button. Pressing the On/Off Button can terminate the
Sleep Mode.
A changeover from Heat to Cool or another Mode will
reset the Sleep Timer.
The Sleep Function will raise 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 pressing
the power-on-reset or any button (except sleep) on the
touchpad or the Remote Control.
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