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T
OTAL
P
AC
2
T
OTAL
P
AC
2 Integrated Fire Protection System
Air Supply
FM-086G-0-43E
4. To drain the Air Supply Accumulator:
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. This unit has been designed to operate between
32 and 100oF.
At least once a year, open air option 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 supplies style "B" or "C":
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).
Refer to Figure 2 or 3 for details.
Features:
• Replaceable air filter
• Outlet pressure range is 5 to 75 psi ( ± 2 psi) (34,47 to
517,11 kPa). Air pressure setting can be readjusted
after installation. See Paragraph 3.6, TO ADJUST
SYSTEM AIR PRESSURE.
• Ball check to prevent back flow.
• Restriction 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 must be
continuous, clean, dry and oil free.
• By-pass piping is provided to allow initial pressurization
of system piping more rapidly than the restricted air flow
through the APMD will allow.
• Determine the appropriate pressure to be maintained in
the system. Refer to Table 1 or Table 2 of the current
Section.
• If adjustment is necessary, refer to paragraph 1.3 of
the current Section
The APMD (E5) should be checked for correct pressure
regulation after installation or repair by noting the air
pressure reading within the system. If adjustment is
required, refer to paragraph 1.3 of the current Section. The
filter should also be inspected and replaced or cleaned as
required.
To clean Air Pressure Maintenance Device (APMD) (E5) in
Air option B (refer to Figure 2):
• Do not disconnect or disassemble the APMD
without closing the outlet (E7) and inlet (E6)
isolation valves. System air pressure will be trapped
between the outlet of the APMD and the
downstream control valve. Relieve pressure before
proceeding with disassembly.
• This procedure requires turning OFF the
compressor's power.
• Carefully loosen the union between the outlet of
APMD (E5) and the outlet isolation valve (E7) to
relieve pressure.
• Remove and clean Air Pressure Maintenance
Device (APMD) filter. Refer to VIKING Technical
Data Sheet 127 Model D-2 Air Pressure
Maintenance Device for more details. If admission
filter is blocked, replace with filter kit (part # 03007
A).
Refer to Viking Data Sheet 127 for additional details.
To close the Air Supply:
Close Air Pressure Maintenance Device (APMD) output
isolation valve (E7) by placing handle crossways to the valve
body. Make sure the APMD input valve (E6) is open (handle
in line with valve body), and the bypass valve (E8) is closed
(handle crossways to valve body). Refer to Figure 2 or 3.
Air supply style "D":
• The air or nitrogen supply provided must be
continuous, clean, dry and oil free.
• Determine the appropriate pressure to be
maintained in the system. Refer to System Data
and Technical Data for the system and components
used.
Important: Advise local authorities of the necessary work
over the fire protection equipment. In order to avoid
accidental water release, it is considered good practice to
completely close the main water inlet valve while doing
maintenance work.
WARNING !
Air compressor head and copper tubing may
be relatively hot after the air compressor has run for some
time. Take precautions when handling the components to
avoid skin burns.
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