Form 2045-0803 © Copyright Trolex Corporation & ZoneFirst P a g e | 4
6 Aspen Drive - Randolph, NJ 07869 | 1-877-FirstZone (347-7896)
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Leaving Air Temperature Sensor
The Leaving Air Temperature 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 adjustable from 100°F to 170°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 MZS4 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 LAT1 and LAT2
terminals on the MZS4 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
Leaving Air Sensor
(Mounted in Supply Air before Zone Dampers)
Model ZPS
LAS Terminals
On Zone Panel
NOTE: If the ZPS is not used, the NO SENSOR jumper located near
the LAT terminals must placed across the two pins. When the sensor
is used the jumper must be removed from the pins.
Stage Timer
The MZS4 has a built-in stage timer that eliminates the need and added
cost of using two stage thermostats. On a call for either heating or
cooling the timer begins. A minimum of 5 minutes, adjustable to a
maximum of 23 minutes, can be set in order to activate the W2, W3 and
Y2 outputs after the first stage call.
The Stage Timer is marked 0 through 9 and each increment is indented
as the dial is rotated. A minimum 5 minutes is set when the dial is set to
0. To calculate the stage timing the dial setting is multiplied by 2 and
added to the base of 5 minutes. Example: Dial setting is 3 x 2 = 6 + 5 =
11 Minutes for the Stage Timer.
When any zone calls the timer starts and activates the second stage W2
or Y2 after the set time elapses. The timer also controls W3 after the
same time elapses after the W2 call.
PURGE TIME
The MZS4 has a built-in Purge Time after each call is satisfied and
provides a minimum off time before another call is initiated. The Purge
Time is set at 2.5 minutes after all calls for a particular mode are satisfied
or when the Changeover Timer requires a changeover due to opposing
calls.
After all calls are satisfied or the changeover timer activates, the Purge
Timer begins and the heating or cooling, whichever was on, is
deactivated. Typically the fan may be running during this time and the
damper(s) to the last zone(s) calling will remain open to purge the
conditioned air only into those zones that were calling for the
conditioning.
DIP Switch 5 can be set ON to keep the Fan running during the Purge
mode in order to prevent the fan cycling off and back on between
modes. In the instance where the Fan staying may create a draft, and
the frequency of opposite calls is minimal this switch can be kept to
OFF.
The CLR PRGE button on the top left of the panel can be pushed to
override the Purge mode and speed installation and checkout. This
button is only active when the System LED is AMBER.
Minimum On Timer
The MZS4 also has a minimum on time whenever the compressor
operates in order to prevent frequent short cycling. Once there is a call
for cooling or the compressor on a heat pump, the MZS4 will hold that
call for a period of 2 minutes.
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 MZS4 unique
to any other zoning system.
Zone-Adder™ Control
The MZS4 Zone Panel can be added onto with the MasterZone-Adder™
Model MZA. The MZA is available as a 2 zone adder panel and
expands any MZS4 panel up to 10 zones, using a maximum of three (3)
MZA panels. The MZA2 panel is connected by a 6 conductor RJ11
telephone cable. This makes wiring between the MZS4 and MZA2
literally a snap. This cable is included with each MZA panel.
CHECKOUT
The MZS4 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 Limit – RED Flashing
Cool ON - GREEN
Cool Limit - GREEN Flashing
FAN ON/PURGE - AMBER
TIME DELAY – 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.
5 MIN + 2X
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