Maytag Amana PMH Series Service And Troubleshooting page 15

SYSTEM OPERATION
IN1 COM IN2 C
AUXILIARY
REMOTE
Control Board
Connections
*NOTE: For high speed fan operation, connect "G" to "GH".
** NOTE FOR THE B TERMINAL: If unit is a heat pump
connect B from stat to B on the board.
IMPORTANT NOTE: Disconnect power to the unit and/or
turn the Master Switch on the control board to OFF when
connecting or altering wiring to any terminal. Failure to do
so may result in shorting the fuse or damaging the control
board.
MAXIMUM WIRE LENGTH
FOR FRONT DESK SWITCH
Wire Size
(AWG)
#24
#22
#20
#18
#16
The following figure shows a wiring schematic for connect-
ing the front desk switch to the unit.
GL W2 Y/W1 B
C R
IN1 COM IN2
THERMOSTAT
AUXILIARY REMOTE
FRONT
DESK
SWITCH
Front Desk Control (IN1, IN2, COM)
The COM and (IN2 or IN1) terminals provide control inputs
for a front desk switch. Shorting across the terminals will
disable unit operation. The only control function which will
remain active when these terminals are shorted is freeze
protection. Any switch which will produce a short circuit
GL W2 Y/W1 B GH
R
THERMOSTAT
Thermostat Connections
Maximum
Length Allowed
(ft)
400
600
900
1500
2000
IAT
GH
BLACK
across these two terminals can be used as a front desk
switch. The contact resistance of the switch, when closed,
must be less than 200 ohms for the front desk feature to
operate properly. Table 3 shows the maximum wire length
and corresponding gage size for installation of a front desk
switch. The following figure shows a wiring schematic for
connecting the front desk switch to the unit.
If the unit is configured for wired unrented setback ener-
gy management (see Configuration Settings section u8
and u9). If IN* and COM are shorted, the unit will go into
setback temperatures for cooling and heating as configured
in c3 and c4 (see Configuration Settings). Unit operation
will be disabled. "Fd" (see Diagnostic Codes) will appear
on the display. This allows the room to quickly recover to a
comfortable temperature when the room is occupied.
Wireless Communications
PTAC models PT**G*** have the option to use a wireless
thermostat and door sensor. The thermostat and /or door
sensor will require an antenna for communication with the
digital control board.
Antenna Installation For DT01* Kit
A DT01* antenna must be installed on the digital PTAC
to allow operation of either the DS01* remote RF thermo-
stat or a DD01* combination PIR motion sensor and door
switch.
Preparation
1. Disconnect power to the unit by unplugging the power
cord at the wall outlet or subbase, or disconnect power
at the fuse box or circuit breaker.
2. If the cabinet front is screwed to the chassis, remove
the 1/4" screw (or screws). See following figure.
Front Mounting Screw
accessed
through louvers.
3. Remove cabinet front from chassis by tilting the bottom
of the front forward, lifting slightly up and forward.
4. Mount the antenna as high up on the control panel as
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