McQuay PDAE Instructions d'exploitation télécharger pdf (Page 17)

IM 950-1 / Page 17 of 38

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 Standard Digital Control Board

Wiring Diagram on page 31).

AC/ELE

• If AC/ELE is selected then a signal on W

terminal will call for heating.

HP or HP/ELE

• If HP or HP/ELE is selected then signals on Y

and B terminals will call for heating.

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 T’stat

3. Indoor fan mode and the speed will default to

“cycle” and “high” when unit is controlled by

Remote T’stat

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 conrm 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 same

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 ve 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 ve seconds to

conrm normal mode has been resumed.

Controls

Standard Digital Touchpad Control

Modes of Operation

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 satised (+ 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 ve

(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 be deactivated by pressing

the power-on-reset or any button (except sleep) on the

touchpad or the Remote Control.

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McQuay PDAE Instructions d'exploitation Page 17

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