OUTDOOR VENTILATION AIR
( All Models )
Outdoor air must be ducted to the air
make up unit inlet when unit is installed
inside of a building. This ducting shall
be no smaller than 30” square or the
equivalent in crossectional surface area
in diameter of round ducting. Bends or
transitions are not recommended and
length should be kept to less than 5
meters or 16.5 feet. If bends or
transitions are required, turning vanes
are recommended.
LINE PRESSURE TEST
( All Models )
The make up unit and its inlet manual
gas valve must be disconnected from gas
supply piping during any pressure
testing above 21” WC. The air make up
unit must be isolated from the gas supply
system by closing the manual gas valve
up stream of the regulator on the inlet of
the gas manifold.
PROPER SEQUENCE OF
OPERATION
The Garmat
®
USA Inc. air make up unit
can be ordered with several different
usage options. To simplify the sequence
of operations, all four available options
will be covered.
There are four modes of operation:
Power On, Run or Spray, Recycle or
Bake and Shut Down.
Power On
( Models 99273 & 99275 )
The three phase voltage supplies power
to the control transformer. The 120, and
24 volt is connected through the control
transformer. When the power switch and
spray switch are actuated, power is given
to the motors. If either exhaust fan motor
starter or the supply motor starter trips
out on overload the respective motor and
make up unit operations will cease until
respective motor starter is reset. Both
control voltages are protected with
breakers in the main electrical panel.
A 120 volt jumper is provided in the
main control panel which can be
connected through a NC contact on a
micro switch used for a fire suppression
system.
When The NC contact is opened, the 120
volt control supply is removed from the
circuit and the entire unit shuts down.
The EM (Emergency stop) switch on the
remote control panel does the same.
Rotating the EM switch reconnects the
120 volt supply, unless the fire system
has not been reset.
The green light will illuminate when the
EM switch is rotated clockwise. The 120
volt control power is connected through
the EM switch in the remote control
panel. If either motor starter trips out on
overload, a red light will illuminate for
the respective motor and make up unit
operations will cease until respective
motor starter is reset. Both control
voltages are protected with breakers in
the main control panel.
Run or Spray
( Models 99270 and 99270-E )
With the OFF switch on the spray cycle
can be started by pushing the SPRAY
switch. The air make up will run in the
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Summary of Contents for 99270
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