MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS
11 69-1360–2
Thermostats
The panel can use almost any four-wire (R,W,Y,G) thermostat.
Each zone requires its own switching subbase with either
manual or automatic changeover. See Table 1 for
recommended thermostats.
HEAT PUMP OR MULTI-STAGE THERMOSTATS
Heat pump or multi-stage thermostats are not required for the
MABS EZ panels because a timer in the panel brings on the
second stage. A heat pump thermostat is used only when
emergency heat control from the thermostat is desired. Use
only Table 1 recommended heat pump thermostats.
EMERGENCY HEAT MODE
An emergency heat switch is located on the side of the panel
and can be accessed without removing the cover. A heat
pump thermostat is used only when emergency heat control is
desired from the thermostat instead of from the panel.
Energizing the L terminal on the zone thermostat or switching
the Emergency Heat switch to the On position places the
system in Emergency Heat mode. This switch does not initiate
a call for emergency heat and prevents the first stage (heat
pump) from being used on a call for heat.
Fan On In Heat
The system fan can be set to come on with a heat call, as
required, with a hydro-air, heat pump, or electric heat system.
Set DIP switch 8 to the On position to activate this mode.
Otherwise, leave it in the default Off position.
Second Stage Emergency Heat Jumper
A jumper is installed on the jumper block to energize W2
output during a call for emergency heat. If there are two forms
of auxiliary heat, one can be connected to W2 as the second
stage of heat and the other to E as the emergency heat stage.
See Fig. 4.
Table 8. DIP Switch Settings.
DIP Switch
NO.
Switch Function
with DIP Switch
Off (Default)
Switch Function
with DIP Switch
On
1 3.5 minute Purge
with fan on
2 minute Purge
with fan off
2 ZMS 160°F (71°C)
heating limit
ZMS 120°F (49°C)
heating limit
3 ZMS 40°F (4°C)
cooling limit
ZMS 48°F (9°C)
cooling limit
4 Normal operation Test mode;
accelerated
timings
5 See Table 4. _.
6 See Table 4. _
7 See Table 4. _
8HVAC unit-
controlled fan
Fan on with call for
Heat
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