IM 1193 / Page 18 of 32
Operating Instructions
Cooling or Heating – Manual Operation
The PGAN unit controller has built-in features such as ran
-
dom start, compressor time delay, night setback, load shed,
shutdown. The 24 volt low voltage terminal strip is set so R-G
energizes the fan. R-W1 energizes the fan and compressor.
User Controls
A 4 button touch key pad, with a High/Low Fan speed and
Auto/On Switch located behind the control door, controls
both temperature and operation mode.
Thermostat Setting
4-button touchpad with display.
Pressing the COOL thermostat control and the up or down
arrows will provide a cooler room temperature. Pressing the
HEAT thermostat control and the up or down arrow keys
will provide a warmer room temperature.
LCDI Power Cord
230/208V and 115V units are equipped with a LCDI power
cord and can open the electrical circuit to the unit. In the
event the unit does not operate, check the reset button
located on or near the head of the power cord as part of the
normal troubleshooting procedure.
Fan Speed
The fan speed selector switch will deliver high, low or auto
fan speed to circulate room air.
Note:
The AUTO selection will not be available if a fan
speed is selected without COOL or Heat selection.
Fan Operation HIGH or LOW with HEAT or COOL mode
selected
•
The fan shall run in the selected speed.
•
Fan Operation AUTO with HEAT or COOL mode
selected - The fan will run in low and high speed. The
changes in fan speed are automatic.
Diagnostic Light - Internal Touchpad
The green diagnostic light located in the lower left hand
corner of the touchpad and indicates operation warnings.
This light usually indicates that either the filter or coils need
cleaning.
Please refer to the
"Monthly Maintenance and Cleaning" on
page 24
section for the proper cleaning procedure. If this
light is still on after cleaning, please refer to the
"Diagnostic
Maintenance & Status Report - Internal Control Touchpad"
on page 22
section for assistance.
Master Switch
The master switch disconnects power to all of the system
components. When this switch is in the off position, the
compressor, fan motor, reversing valve, and electric resis
-
tance heater will all be de-energized.
Remote Thermostats
NOTICE
When using existing thermostats by others;
There are two basic types of thermostats manufactured today;
those with relay contacts, and those with solid-state triacs. If
you open the thermostat and don't see relays then you can
assume it to be solid state.
Manufacturers of solid state output thermostats include loading
resistors on their installation kits. These are of low Ohm value,
approximately 560 Ohm and 3W. The resistors are meant to
load the thermostat outputs in order for the output voltage to be
either 0 or 24VAC, i.e. no floating voltage. These resistors are
connected from W, Y, G to common (C), respectively. There
-
fore, if you are using existing solid-state thermostats, you may
have to add loading resistors for your PTAC controls to work
properly. McQuay thermostats do not require this modification.
To operate this unit with a “manufacturer-approved” remote
thermostat, configure the control to be operated by the
remote thermostat. Enter configuration mode C1 and then
select option Code L5 (see Configuration Settings,
Table
15
). When in the remote mode, the unit will only respond to
the thermostat inputs (terminal strip positions GL (or GH),
W2, Y/W1, and B* shown in “Control Board User Inputs”
illustration).
Notes:
Once configuration C1 with option code L5 has been
selected, the control touchpad will no longer accept
inputs other than configuration and diagnostics
modes. The room occupant must operate the unit at
the remote mounted thermostat.
In remote mode, the 3-minute compressor time delay,
the random restart feature and the freeze protection
feature are all active (see Unit Features section).
When remote wall-mounted thermostat is used, the
delay may be a total of 8-minutes.
Thermostat Location
This unit is designed to be operated with remote wall
mounted thermostats. For further information on thermostats
approved for use with this unit, contact your sales represen
-
tative.
For best performance results, the thermostat should be lo
-
cated approximately five feet above the floor on a vibration
free, inside wall in an area with good air circulation.
Do not install the thermostat where it may be affected by the
following:
• Dead spots behind doors, in corners or under cabinets
• Hot or cold drafts from air ducts
• Radiant heat from the sun, appliances, or fireplaces
• Concealed pipes and chimneys
• Unheated (uncooled) areas behind the thermostat, such as
an outside walls
Consult the instruction sheet packaged with the thermostat
for further details on mounting and operation.
