The cover easily removes from the case by pulling firmly and
separating the cover from the case exposing the circuit board.
There are 4 key-hole mounting points in each corner of the case.
The case has openings in the rear of the case as well as the side for
all wiring. Wiring can come from the back as well as the side in order
to make a neat installation.
OPERATION
The PCMMP3 controls single stage heating and cooling HVAC
Equipment. The PCMMP3 is compatible with any standard single
stage thermostat and setback thermostats as well. The PCMMP3
has various features that make installation and checkout very simple
for all of the board’s functionality.
The PCMMP3’s basic function is zone control. On a call for heating
or cooling, the panel will accept the first call from any zone. Upon
accepting this call the PCMMP3 will keep open the damper(s) to the
zone calling, close the damper(s) to those zones not calling, activate
the needed HVAC controls for heating or cooling, whichever is being
called and not accept any calls for the opposite mode.
Any calls for the opposite mode will be locked out until the initial
mode is either satisfied or a period of time has elapsed that is
sufficient for the first mode to satisfy, a maximum of 20 minutes. A
Patent Pending sequence determines the time the unit has been
running or needs to continue to run in order to adequately provide
conditioning for each mode. If a particular mode has already been
calling for 20 minutes or longer and an opposite call comes in the
PCMMP3 will immediately drop the mode, enter the purge mode in
order to dissipate the conditioned air into the zones calling before
switching over to provide the new conditioning call to its zones.
PURGE TIME
Once a call is satisfied the PCMMP3 drops the call for the heating or
cooling unit controls, whichever was calling and hold the damper(s)
to the zone(s) that were last calling during the Purge Mode. The
Purge mode is nominally 2 minutes and allows the excess
conditioned air in the plenum to be distributed only to the zone(s)
that were last calling. This eliminates the problem of overshooting
the temperature in the satisfied zones.
During the Purge mode the panel can be set to keep the Fan
running during Purge or to let the fan control in the HVAC unit to
control the fan. By using the FIPG (Fan On-In Purge) jumper, on the
top right corner of the control panel, this keeps the fan running until
the Purge mode is over. This mode avoids the fan shutting off during
the Purge mode and coming back on when another zone may be on
constant fan after the Purge Mode is over. This may be more often
used in commercial applications for continuous air circulation (CAC).
In residential applications the fan remaining on, especially in
heating, may be drafty and objectionable.
Once all zone thermostats are satisfied for heating and cooling, the
PCMMP3 can now accept Fan calls allowing Continuous Air
Circulation(CAC) in those zones where the thermostat’s Fan Switch
is set to ON. These zone dampers will be OPEN while the dampers
to the zones where the Fan Switch is set to AUTO will be CLOSED.
When all zone thermostats are satisfied for both Heating and
Cooling, and all Fan switches are set to AUTO position, the HVAC
unit will be off and all zone dampers will return to a normally open
position. Once a zone calls for heating, cooling or fan, the dampers
to the calling zones remain open and the dampers to the zones not
calling will close.
HVAC Equipment Set-Up
The PCMMP3 is factory set for conventional fossil fuel (oil or gas)
single stage heating and cooling. The panel only needs to be
configured when using with a conventional electric furnace or hydro-
air system in order to bring the fan on with a call for heat.
By using the FIH (Fan On-In Heat) jumper, located on the upper
right corner of the board, this allows the Fan to be activated with a
call for heat. Once the heat call is satisfied the fan will shut off as
well, as long as the FIPG jumper is off as well.
Other jumpers on the panel are for NO SENSOR and LOW LIMIT.
The NO SENSOR jumper must be on to jumper the pins when no
sensor is used. The LOW LIMIT jumper is OFF for a Heating limit of
170°F and ON for a higher heating limit temperature 180°F.
CHANGEOVER TIMER
Whenever a call is made for either heating or cooling, the
changeover timer is activated in order to track the amount of time
heating or cooling is on. When an opposite call is made after a first
call is existing the changeover timer calculates the amount of time
the unit has already been supplying the first mode in order to
determine how long it will hold off the opposite call. If an opposite
call is made shortly after the first call, the opposite call may be held
off for as much as 20 minutes. If the first call or subsequent calls for
the first call mode has had that mode operating for up to 20 minutes
already and an opposite call comes in after 20 minutes, the
changeover timer will immediately recognize the opposite call,
shutting off the current mode, enter the purge mode and
automatically switch to the opposite mode.
The longer a call has been running up to 20 minutes, the shorter the
wait time will be for an opposite call. If a call is over 20 minutes and
an opposite call is made the changeover will be immediate following
the purge time. This intelligent changeover timing makes the
PCMMP3 unique to any other zoning system.
CHECKOUT
The PCMMP3 has unique features that simplify the checkout of the
system and has LED readouts that constantly indicate the system
operation. Once 24 Volt Power is applied to the panel the Green
Power LED will illuminate. This will stay illuminated constantly when
power is applied.
The System LED will provide several different indications based
upon color and if it is flashing.
Heat ON
– RED
Heat Over limit
– RED Flashing
Cool ON
– GREEN
Cool Over limit
– Green Flashing
FAN ON
– AMBER
PURGE
– AMBER Flashing
Each zone has its own small Green indicator LED next to each zone
relay. This light is lit whenever the zone damper is to be open, either
on a call or when all zones are satisfied.
WIRING
The PCMMP3 is very simple to wire and requires only a minimum
number of connections. The PCMMP3 terminal blocks are screw-
less and all wires can easily be pushed into their respective terminal
by de-pressing the button for each point and releasing once the wire
is seated. To remove the wire, just press its button again and
remove the wire.
Zone Dampers
– The PCMMP3 powers only the 12VDC plug-in
dampers. Each damper comes with a modular cord and plugs
(RJ11) already installed to allow each zone damper to just plug into
the PCMMP3 panel. Additional dampers can be slaved to one
another by using the splitter included with each damper. Additional
dampers are connected via each splitter to “daisy chain’ from one
damper to the next. A maximum of 10 dampers per zone is
recommended.
Upon installation it is recommended that as each motor is connected
that each motor is cycled, before connecting the next motor, to
insure proper operation of that motor and to minimize
troubleshooting looking for a possible bad motor or wire connection.
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