Page 2 of 12
T
OTAL
P
AC
®
3
D
Integrated Fire Protection System
Air Supply - Preaction System
FM-076A-0-86C
2. Operation
2.1 Air supply Style "A"
(refer to figure 2)
To apply air supply
Establish AC power for the air compressor by activating
the correspondent circuit breaker at the electrical
distribution panel. Start air compressor by activating the
compressor isolating switch
(E15)
located on the junction
box of the unit (see figure 2 in section
E
CONTROLS
SECTION
).
If the air compressor motor fails to start or slows down
under load, shut the air compressor off. Check that the
supply voltage agrees with the motor nameplate.
To close air supply
Turn off the compressor isolating switch
(E15)
(see
figure 2 in section
E
CONTROLS SECTION
).
To adjust air supply
The air compressor cut-off pressure switch
(E2)
is factory
set. This switch should not need any adjustment but if
necessary, follow the instructions below:
WARNING
The adjustment screw of the cut-out/cut-in
differential pressure switch
(E2)
(small screw to the right)
is factory set. DO NOT CHANGE ITS SETTING. Any
unauthorized modification of this adjustment screw will
void the system warranty and may also prevent the system
from operating normally.
1. Remove the metal cover of the compressor air pressure
switch
(E2)
.
2. To raise the cut-out pressure of the air compressor, turn
the cut-out adjustment screw (middle) half a turn
CLOCKWISE. Use the same method turning the cut-
out adjustment screw COUNTER-CLOCKWISE to lower
the air compressor cut-out pressure.
Figure 1 - Air pressure adjustment
INCREASE
PRESSURE
LINE
MOTOR
LINE
Turn clockwise to increase
both cut-out and cut-in
pressure adjustment
Factory set
DO NOT CHANGE !
FM-072Q-0-109B
Note :
Do not turn the cut-out adjustment screw (middle) all
the way down in one shot. Proceed by steps.
3.
OPEN
the main drain valve
(D3)
and let the pressure
drop until the air compressor restarts. Check pressure
reading on the system pressure gauge when the air
compressor stops again. Repeat until the desired
pressure is reached. Once all done, replace the metal
cover on the switch
(E2)
.
2.2 Air supply Style "B" or "C"
(refer to figure 3 or 4)
To apply air supply
1. Turn on upstream air supply.
2.
OPEN
APMD (air pressure maintenance device) input
valve
(E6)
by placing handle in line with valve body.
3.
OPEN
APMD output valve
(E7)
by placing handle in line
with the valve body.
4.
OPEN
bypass valve
(E8)
by placing handle in line with
valve body in order to accelerate filling of sprinkler
piping network by air pressure, while piping is initially
filled.
5. Once the piping network pressure is reached,
CLOSE
the
bypass valve
(E8)
by placing handle crossways to valve
body, and kept in this position.
Note:
The bypass valve
(E8)
must be kept closed once the
system is filled with air.
To close air supply
1.
CLOSE
APMD output valve
(E7)
by placing handle
crossways to valve body.
2.
CLOSE
APMD input valve
(E6)
by also placing handle
crossways to the valve body.
3. Be sure bypass valve
(E8)
is
CLOSED
(handle crossways
to valve body).
To adjust air supply
1. Verify that APMD input valve
(E6)
and APMD output
valve
(E7)
are both
OPEN
(handle in line with the valve
body).
2. Be sure that bypass valve
(E8)
is
CLOSED
(handle
crossways to valve body) prior to performing this
operation.
3. Loosen lock nut of the APMD
(E5)
and turn pressure
adjustment nut clockwise to increase air pressure or
counter-clockwise to decrease pressure.
4. Tighten lock nut.
Note:
Depending on site conditions, the internal filter of the
APMD may need maintenance on a regular basis. Refer to
Viking data sheet #127 for more details.
2.3 Air supply Style "D"
(refer to figure 5)
To apply air supply
1. Turn on upstream air supply.
2.
OPEN
air shut-off valve
(E6)
.
To close air supply
1.
CLOSE
bypass air shut-off valve
(E6)
.