Specifications

Manual 2100-590C
Page 33 of 67
24. FILTERS
A 2” thick throwaway filter is supplied with each unit.
This filter is installed by opening the filter service door.
(See Figure 16.)
Replacement filters are available through your dealer.
25. COMPRESSOR CONTROL MODULE
The compressor control module is standard on models
covered by this manual. The compressor control is
an anti-short cycle/lockout timer with high and low
pressure switch monitoring and alarm relay output.
Adjustable Delay-on-Make and Delay-onBreak Timer
On initial power up or any time power is interrupted to
the unit, the delay-on-make period begins, which will
be 2 minutes plus 10% of the delay-on-break setting.
When the delay on make is complete and the high
pressure switch (and low pressure switch, if employed)
is closed, the compressor contactor is energized. Upon
shutdown, the delay-on-break timer starts and prevents
restart until the delay-on-break and delay-on-make
periods have expired.
During routine operation of the unit with no power
interruptions the compressor will operate on demand
with no delay.
High Pressure Switch and Lockout Sequence
(Standard Feature)
If the high pressure switch opens, the compressor
contactor will de-energize immediately. The lockout
timer will go into a soft lockout and stay in soft lockout
until the high pressure switch closes and the delay-
on-make time has expired. If the high pressure switch
opens again in this same operating cycle the unit will
go into manual lockout condition and the alarm circuit
will energize. Recycling the wall thermostat resets the
manual lockout.
Low Pressure Switch, Bypass and Lockout Sequence
NOTE: The low pressure switch is an optional control
and the bypass and lockout sequence are part
of the standard compressor control module.
If the low pressure switch opens for more that 120
seconds, the compressor contactor will de-energize
and go into a soft lockout. Regardless the state of the
low pressure switch, the contactor will reenergize after
the delay-on-make time delay has expired. If the low
pressure switch remains open or opens again for longer
than 120 seconds the unit will go into manual lockout
condition and the alarm circuit will energize. Recycling
the wall thermostat resets the manual lockout.
FIGURE 16
ACCESS INTERNAL FILTER
THROUGH UPPER SERVICE DOOR
MIS-3237
FILTER
FILTER
SERVICE
DOOR