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Integrated Fire Protection System
D
Air Supply - Preaction System
FM-076A-0-86C
3. Maintenance and inspection
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 supply valve
(D1)
while
doing maintenance work.
3.1 Air supply Style "A"
(refer to figure 2)
The Style “A” air accumulator should be drained once a
year. 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.
To drain the air supply accumulator
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.
Safety valve pressure
A safety relief valve is provided on standard compressor
and is preset at the factory. Do not adjust or exceed
safety relief pressure other than those preset at the
factory.
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.
WARNING
Do not unscrew relief valve head entirely off
while the compressor is operating. Ejection of valve parts
could cause severe injury.
3.2 Air supply Style "B" or C"
(refer to figure 3 or 4)
The Viking Model D-2 APMD (air pressure maintenance
device)
(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).
Determine the appropriate pressure to be maintained in the
system. Refer to table 2 or table 3 of the current section.
If adjustment is necessary, refer to paragraph 2.2 of the
current section.
To clean APMD (air pressure maintenance device)
1. Turn off external air supply.
2.
CLOSE
APMD output valve
(E7)
by placing handle
crossways to valve body.
3.
CLOSE
APMD input valve
(E6)
by also placing handle
crossways to the valve body.
NOTE :
Never disconnect or disassemble the APMD
(E5)
without closing those isolation valves.
4. Carefully loosen the union between the outlet of
APMD
(E5)
and the outlet isolation valve
(E7)
to relieve
pressure.
5. Remove and clean air pressure maintenance device
APMD
(E5)
filter. If admission filter is blocked, replace
with filter kit (part #03007 A).
Refer to Viking data sheet #127 for additional details.
3.3 Air supply Style "D"
(refer to figure 5)
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 table 2 or table 3 of the current section.
