Install Instructions

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

WIRING DIAGRAM 2 – Single Stage Equipment

WIRING DIAGRAM 3 – 24 Volt AC, 40 VA Transformer

Leaving Air Temperature Sensor

The Leaving Air Sensor, Model ZPS, is a remote sensor that is located

in the supply air duct to sense the leaving air temperature of the HVAC

Unit. The ZPS 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 ZPS 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F. The cooling limit is fixed at 40F.

When the ZPS senses heating above its set point, or cooling below its

set point, the MMZ3 will drop both stages of heating or cooling. The

ZPS must sense a 10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 ZPS requires 2 wires from the sensor to the LAT terminals on the

MMZ3 panel. The ZPS 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

NOTE: If the ZPS is not used, the NO SENSOR jumper located just

above the LAT terminals must be on the pins.

TROUBLESHOOTING

The MMZ3 is a very simple control to troubleshoot, especially with the

LED indicators. The only other device needed is a simple Volt/Ohm

meter.

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.

Almost all problems can be traded to an external component or wiring

to the MMZ3. While the MMZ3 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.

Zone(s) Not Calling

Each zone has a Green LED next to the zone relay when it is calling.

The LED being lit shows that the call is being recognized by the

MMZ3. If a zone is supposed to be calling and the Zone LED is not

on, check for 24VAC across the thermostat terminal C and the Y, if a

Cool call, W if a Heat Call, or G if a Fan call. If there is no voltage here

at the panel the panel is not getting the signal from the thermostat.

The problem is mis-wiring, a broken wire or a problem in the

thermostat. To check the zone on the panel, place jumper from R to Y

to simulate a Cool call, R to W to simulate a Heat call, or R to G to

simulate a Fan call. By jumping these terminals the zone call LED will

activate.

Zone(s) Will Not Shut Off

If a zone will not stop calling, the Zone LED should still be on.

Depending on the call disconnect the Y, W or G wire from the terminal

strip. The zone will drop out. Check the thermostat wiring for a mis-

wiring or short that keeps the zone calling.

Damper Motor Checkout

To checkout the dampers, the panel provides 24VAC to the COM and

OPEN terminal when the damper is to be open and 24VAC to COM

and CLOSE when the damper is to be CLOSED. When any zone is

calling and its Green LED is ON, there is 24VAC across COM and

OPEN. The only time a damper will close is when another zone is

calling and its zone is not calling. In this instance there will be 24VAC

across COM and CLOSE terminals.

Refer to the instructions with each damper for their individual

checkout.

Y COMPRESSOR RELAY

G FAN RELAY

W HEAT RELAY

R 24V. TRANSFORMER C

FURNACE CONTROLS

OUTDOOR CONDENSING UNIT

EQUIPMENT

24V TRANS

T24 -24V 40VA

TRANSFORMER

Leaving Air Sensor

(Mounted in Supply Air before Zone Dampers)

Model ZPS

LAS Terminals

On Zone Panel

BOOT

Form 2233-0912

MMZ3 Installation and Operating Instructions