Form 2045-0803 © Copyright Trolex Corporation & ZoneFirst
P a g e
| 3
6 Aspen Drive - Randolph, NJ 07869 | 1-877-FirstZone (347-7896)
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INSTALLATION
The MasterZone
™
Zoning System-4 is a four (4) zone control panel that
controls up to four zones of heating and cooling. The MZS4 panel is the
central control panel that all zone dampers, zone thermostats, HVAC
Equipment, power transformer, Leaving Air Sensor and ZoneAdder
™
panels are wired.
When installing the MZS4 panel it is important to pick a central location
where it is most convenient to bring all the wires. Most often this is at
the furnace or air handler. It is often the most convenient location and
closest to power, the HVAC unit controls and the zone dampers when
typically located at or near the plenum.
The MZS4 panel is made of sturdy ABS plastic and can be mounted to
any flat surface. It is recommended that the panel be mounted to a wall
or return plenum and NOT on the furnace or plenum where it will be in
contact with the hot temperatures.. The panel can be located in an attic
space or in an enclosed cabinet of a rooftop unit, in order for the panel
to be in direct exposure to the elements.
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 MZS4 can control various types of HVAC Equipment all from the
same panel. The MZS4 features allow the use of single stage
thermostats to control up to three stage heating and two stage cooling
and simple heat pump thermostats to control heat pumps. The MZS4
has various features that make installation and checkout very simple for
all of the board’s functionality.
The MZS4’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 MZS4 will open the damper(s) to the zone(s)
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, when both calls occur
simultaneously. An exclusive 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 MZS4
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.
When using the MZS4 to control multi-stage heating and/or cooling, the
extra stages are controlled based upon time after the first stage call from
the thermostat. When any zone calls the panel’s built-in timer begins
and after the set period of time elapses the MZS4 will also activate the
W2 for Heating or Y2 for Cooling. In heating, after the second stage is
activated the same timer will control the third stage of heating. The
Stage Timer is adjustable from 5 to 23 minutes after the first stage call.
Once the extra stages are on, these stages will continue to run until the
first stage is satisfied or the Leaving Air Sensor
limit setting is reached.
(See Leaving Air section for further information.)
Once all zone thermostats are satisfied for heating and cooling, the
MZS4 will 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.
Set-Up for Various HVAC Equipment
The MZS4 is factory set for conventional fossil fuel (oil or gas) single and
up to three stage heating and two stage cooling. The panel only needs
to be configured when using with an conventional electric furnace or
hydro-air system in order to bring the fan on with a call for heat, or when
using with a heat pump equipment and thermostats.
Most all of the panel configuration is done by setting the DIP switches in
the lower center of the panel. Below is show their setting and functions.
1.
HP EQP
– Heat Pump Equipment – This switch changes the
output of the HVAC Equipment terminals from conventional
Heating and Cooling to a traditional Heat Pump Output.
When OFF, a heat call activates the W1 output and the
second stage activates W2. When ON a Heat call activates
the Y1 output to bring on the compressor for first stage and
Y2 for the second stage, of both heating and cooling. W3 is
activated on a third stage call in either mode.
2.
FAN HEAT
– Activates the G output to turn the Fan on with a
call for Heat. This is used for Heat Pumps, Electric Heat
furnaces and Hydro-Air Systems. In the OFF position the
MZS4 will not activate the Fan in heating unless there is a fan
call from one of the zone thermostats.
3.
O TO W
– Switch Is placed to ON when using Heat Pump
thermostats that use an O terminal to activate the reversing
valve in COOLING. The O on the thermostat is wired to W
on the zone terminal in order to determine if the call is for
heating or cooling. All zone thermostats must operate and be
wired the same way.
4.
B TO W
– Switch is used when using Heat Pump thermostats
that use a B terminal to activate the reversing valve in
HEATING. The B terminal on the thermostat is wired to W on
the zone terminal in order to determine if the call is for
heating or cooling. All zone thermostats must operate and be
wired the same way.
NOTE: Some OEMs use the B terminal
as a transformer Common and not as the heating reversing
valve. These thermostats will use the O terminal for the
reversing valve and should be wired accordingly using DIP
Switch #3. The B terminal will then be wired to the C
terminal on the thermostat terminal block.
5.
FAN PRG –
This switch keeps the fan running during the
purge time in order to dissipate the conditioned air into the
last zone(s) calling. Placing this switch to ON, prevents the
fan from turning off from the fan control in the HVAC Unit
during the purge mode and coming back on moments later if
another call is waiting. In OFF the fan will be control by
HVAC Fan controls. This is desirable in residential to prevent
cold drafts after heating by having the switch OFF.
6.
EMG HEAT –
EMERGENCY HEAT – This switch can be used
to place all zones into the Emergency Heat mode. This
switch would be used when single stage thermostats are
used.
NOTE: There is no indication on the panel to show
this switch is ON.
7.
ZONE STG –
STAGE CONTROL – This switch is used to
control how the second stage of heating and cooling is
determined. In the OFF position, the second stage is
controlled by the timer. In the ON position the second stage
is brought based on the number of zones calling. Greater
than 50% of the zones calling will bring on the second stage,
for both heating and cooling.
8.
CTRL 3 –
Future Use
One of the many features of the DIP switches is if at anytime the
equipment is changed from single stage to heat pump or vice versa the
thermostats do not need to be changed with the equipment change.
Changing the DIP switch settings is all that is needed.
1 2 3 4 5 6 7 8
ON
OFF
