Install Instructions

ManualsBrandsZoneFirst ManualsDamper ControlsMini-Masterzone 2 or 3 Zone Single Stage Heat/Cool Damper Actuator Control Panel

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 MMZ3 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 MMZ3 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

MMZ3 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 MMZ3 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 180°F and

ON for a higher heating limit temperature 190°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 MMZ3

unique to any other zoning system.

CHECKOUT

The MMZ3 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 Overlimit – RED Flashing

Cool ON - GREEN

Cool Overlimit – 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 when the specific zoning is calling for the mode

shown on the System LED.

WIRING

The MMZ3 is very simple to wire and requires only a minimum

number of connections. The MMZ3 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 MMZ3 can power any 24VAC damper, either 2

wire or 3 wire. See specific wiring instructions with the damper and

inside panel cover.

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 MMZ3 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.

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.

WIRING DIAGRAM 1 – Zone Thermostat and

Damper

ZONE DAMPER

ZONE THERMOSTAT DAMPER

70°

ZONE THERMOSTAT

OPEN

COM

Check Dam p er Inst r u ct io ns

Sp r i ng Ret urn Mo t o r s – 2 Wi res

Pow er Op en Clo se Mo t o r s – 3 Wi res

Zone Connections on Panel

Form 2233-0912

MMZ3 Installation and Operating Instructions