Page 18 of 28
®
DUAL
Integrated Fire Protection System
OWNER'S OPERATION & MAINTENANCE MANUAL
FM-0860-0-31F
5.4 MAINTENANCE AND INSPECTION
♦ Air supply style "A"
See figure 5.3.
To close the air supply:
This procedure requires turning OFF the air compressor's
AC power by switching off the compressor isolating
switch (E15) located within the unit before servicing (see
figure 6.2).
Note: The air compressor motor is equipped with thermal
protectors that reset automatically. These thermal
protectors will stop the motor in case it overheats and
can automatically start the motor when they reset.
Compressor's air inlet filter:
Intake filters are standard on most compressors and will
provide adequate filtration for most applications. Check
filters periodically and replace when necessary. Initial
inspection is suggested at 500 hours, and then the user
should determine the frequency. Most problems can be
prevented by keeping filters clean. Dirty filters decrease
compressor performance and can decrease compressor
service life.
Maintain a clean air filter cartridge to insure best flow and
performance. The location and the quality of the air being
ingested indicate the frequency for inspection and
replacement. A dirty filter restricts air flow, causes the pump
to run hotter and results in longer operating cycles.
To drain the air supply accumulator (E13):
The amount of moisture pumped into the system and how
quickly it accumulates is proportional to the amount of
humidity in the air and how long the compressor is in
operation.
At least once a year, open air inlet drain valve (E12) until all
condensate water is drained from the air receiver. Close air
option drain valve.
WARNING ! The relief valve and outlet pipe of the air
compressor may become very hot during normal
operation. Do not touch the valve, compressor heads
or outlet piping until the compressor has been turned
off and allowed to cool.
A safety relief valve is provided on standard compressors
and is preset at the factory. Do not exceed or adjust safety
relief pressures other than those preset at the factory.
WARNING ! Do not unscrew relief valve head entirely off
while the compressor is operating. Ejection of valve
parts could cause severe injury.
♦ Air supply Style "B"
See figure 5.4.
The Viking model D-2 air pressure maintenance device
(APMD) (E5) is a pressure regulator that automatically
reduces the supply air pressure to a pre-set requirement
when connected to a constantly maintained air supply (plant
air, external tanked air compressor or dry nitrogen tank).
Features:
• Replaceable air inlet filter
• Outlet pressure range is 5 to 75 psi (± 2 psi) (0.345 to
5.17 bar). Air pressure setting can be readjusted after
installation (refer to chapter 5.3 TO ADJUST SYSTEM
AIR PRESSURE for air supply Style "B").
• Ball check to prevent back flow
• Restriction orifice 1/16" (1,59mm) to prevent rapid re-
pressurization of a system
The Viking model D-2 APMD (E5) regulates and restricts air
flow.
• The air or nitrogen supply provided to the APMD (E5)
must be continuous, clean, dry and oil free.
• Bypass piping is provided to allow initial pressurization of
system piping more rapidly than the restricted air flow
through the APMD (E5) will allow.
• Determine the appropriate pressure to be maintained in
the system (refer to table 5.3).
The APMD (E5) should be checked after installation or
repair and adjusted as required for correct pressure reading
(refer to chapter 5.3 TO ADJUST SYSTEM AIR
PRESSURE). The filter should also be inspected and
replaced or cleaned as required.
To clean the APMD (E5):
1. This procedure requires turning OFF the compressor's
power.
2. Do not disconnect or disassemble the APMD (E5)
without closing the outlet (E7) and inlet (E6) isolation
valves. System air pressure will be trapped between
the outlet of the APMD (E5) and the downstream control
valve. Relieve pressure before proceeding with
disassembly.
3. Carefully loosen the union between the outlet of
APMD (E5) and the outlet isolation valve (E7) to relieve
pressure.
4. Remove and clean APMD (E5) filter. If admission filter
is blocked, replace with filter kit (part # 03007 A).
Refer to Viking Technical Data Sheet #127 for additional
details.
To close the air supply:
Close APMD (E5) output isolation valve (E7) by placing
handle crossways to the valve body. Make sure the
APMD (E5) input valve (E6) is open (handle in line with valve
body) and the bypass valve (E8) is closed (handle
crossways to valve body).
To Next Page
Loading...