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© 2012 Mobile Climate Control T-299 Rev. 08/2012
compressor clutch relay, and the condenser fan relay
will remain energized to lower system pressure. The
compressor relay will remain open for a minimum
time of 1 minute, or until high pressure switch circuit
closes.
If a low or high pressure condition occurs, an alarm
will be generated and shown on the display. The
alarms related to low and high pressure are listed
below:
L1- Low pressure failure (Zone 1)
L2- Low pressure failure (Zone 2)
H1- High pressure failure (Zone 1)
H2- High pressure failure (Zone 2)
If any condition occurs 3 times within 30 minutes,
the cooling circuit will be disabled for the associated
Zone until con t roller power is cycled. An alarm will
be generated to indicate this occurrence and shown
on the display. Evaporator fans will remain energized
to provide ventilation. Lock out of cooling system
alarms will show as:
t1- Lock out of Zone 1 cooling system
t2- Lock out of Zone 2 cooling system
2.10.5 Heating Mode (If equipped)
The EnviroMATE Controller has the ability to
control output to a heat control valve and boost
pump (OEM supplied) to supply heat provided by
the engine coolant system. If heat is selected by
pressing the Cool/Heat Key (Item 7 in Figure 2-8),
and the interior temperature is more than 1°Fbelow
set point, the controller will open the coolant heat
valve and allow engine coolant to be provided to the
heater co il (if equipped), until temp erature rises back
to set point temperature.
2.10.6 Sensors
The EnviroMATE Controller constantly monitors
the Return Air sensors (Controller Pins 11 & 15 for
Zone 1) and (Controller Pins 3 & 7 for Zone 2). In
the event the sensor or related wiringcauses an Open
or Shorted condition, the controller will generate an
alarm and either F1 (Zone 1) or F2 (Zone 2) will be
shown on the display screen. The controller
response will assume a default value of 72°F (22.2°C)
for the affected sensor.
2.10.7 Voltage
The EnviroMATE Controller monitors the voltages
being supplied by the OEM by fused circuits on Pins
1&9at the controller. In the event of a low voltage
(below 10 VDC), or an alternator failure, the system
will be disabled, and an alarm bL or AL will be shown
on the display.
2.10.8 Schematics
Typical system schem atics for an EnviroMATE dual
loop system can be found in Section 5, Figure 5-11
and Figure 5-12.
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