Zone Thermostats
– The thermostats wiring will for single stage
can be four or five wire. The fifth wire being the C-Common terminal
for 24 Volt powered thermostats. There are 5 terminals on the
PCMMP3 for each thermostat, marked Y-G-R-W-C. This wiring is
shown on Wiring Diagram 1 for single stage thermostats.
HVAC Equipment
– The HVAC equipment will follow Wiring
Diagram 2 for Single Stage Systems. The PCMMP3 can also control
Heating Only and Cooling Only as well as both Heating and Cooling.
Transformer
– A separate 24 Volt AC, 40VA Transformer is
recommended to power the control panel and dampers. Often the
transformer on the HVAC unit only has enough power for its own
controls. Therefore it is recommended a separate transformer be
used to power this panel and the dampers wired to it.
Transformer Wiring
24V TRA
N
S
C
R
C
R
T24 -24V 40VA
TRANSFORMER
Zone Thermostat Wiring
G
Y
R
W
C
ZONE T
H
ERMOS
T
A
T
G
Y
R
W
C
70°
ZONE THERMOSTAT
Plug-In Damper Wiring
To Additional Dampers
Up to 10 Per Zone, if used.
Zone Damper
Connector on
Zone Panel
NOTE:
It does NOT matter which jack on damper
goes to the panel or additional dampers.
PLUG-IN ZONE DAMPER
25 Foot Modular Cord
(Provided with each damper)
HVAC Equipment Wiring
Y COMPRESSOR RELAY
G FAN RELAY
W HEAT RELAY
R 24V. TRANSFORMER C
FURNACE CONTROLS
OUTDOOR CONDENSING UNIT
Y
G
W
R
EQUIPMENT
Zone Plenum Sensor
The Zone Mix-Air Sensor, Model PCZPS, is a remote sensor that is
located in the supply air duct to sense the leaving air temperature of
the HVAC Unit. The PCZPS is a high limit protection for the heating
and a low limit protection for the cooling. When zoning, the airflow
through the HVAC Unit is critical. The LAS protects the equipment in
low air flow situations as well as when by-pass air is being directed
back into the return air duct.
The heating limit is fixed at 180
n
F. The cooling limit is fixed at 40
n
F.
When the PCZPS senses heating above its set point, or cooling
below its set point, the PCMMP3 will drop both stages of heating or
cooling. The PCZPS must sense a 10
n
F fall for heating or rise for
cooling before re-activating the first stages of heating or cooling. If
two stage heating or cooling is being used the second stage timer
will start again once the first stage is re-activated.
The PCZPS requires 2 wires from the sensor to the LAT terminals
on the PCMMP3 panel. The PCZPS probe can also be adjusted for
length by loosening the end nut and sliding the probe thru the
mounting plate in order for the probe to pass through any duct
insulation.
Leaving Air Sensor
(Mounted in Supply Air before Zone Dampers)
Model ZPS
LAS Terminals
On Zone Panel
NOTE: If the PCZPS is not used, the NO SENSOR jumper
located just above the LAT terminals must be on the pins.
After installing the PCZPS, use the chart supplied with the PCZPS to
check the Ohm reading for the appropriate duct temperature.
TROUBLESHOOTING
The PCMMP3 is a very simple control to troubleshoot, especially
with the LED indicators. The only other device needed is a simple
Volt/Ohm meter.
Almost all problems can be traced to an external component or
wiring to the PCMMP3. While the PCMMP3 has been designed to
operate under extreme voltage conditions and is fuse protected, like
any computer the micro-processor can hang up and not operate
properly. For these instances a BOOT button has been installed that
re-boots the micro-processor just like your computer. Pressing this
button for a few seconds and then release it will allow the micro-
processor to re-boot and in most all cases eliminate the problem. If
not the following procedure can help isolate the problem.
If the BOOT Button does not resolve the problem, turn off the power
to the panel for several seconds until the LEDs got out and then turn
the power back on to see if the panel resets. In many instances this
resolves the problem.
The first check is for 24VAC Power to the panel. When there is
power the Green Power LED will be lit. If not check the transformer
and the power supply to it.
BOOT
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