Air Supply Installation; Air Leakage Test; Hydrostatic Test - Viking G-2000 Technical Data Manual

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C. Air Supply Installation
1. Install the required air supply as described in Viking technical data page 105a-e. The size of the compressor and amount of
air required should be determined in accordance with Table 1. The air or nitrogen supply to the dry pipe system must be clean,
dry, and oil free.
2. Automatic air supplies must be regulated, restricted, and from a continuous source. A Viking Air Maintenance Device should
be installed on each system equipped with a tank-mounted compressor, plant air or nitrogen. For riser-mounted compressors
with a capacity less than 5.5 ft
In addition, the use of an air maintenance device with riser-mounted compressors can lead to compressor "short cycling".
Viking always recommends that a tank-mounted compressor with air maintenance device be used. This can become critical
when accelerators are installed on the system.
Figure 3 - Alarm Pressure Switch Wiring
(Alarm Pressure Switch should be set to 5 psi (0.34 bar)
PS40-2
TO FIRE
ALARM
PANEL
2
COM
EOLR
Figure 4 - Air Supervisory Switch Wiring
(High Air should be set to 10 psi (0.7 bar) above compressor cut out)
(Low Air should be set to 5 psi (0.34 bar) below comperssor cut out)
E. Air Leakage Test:
Perform air leakage test at 40 psi (2.8 bar) for 24 hours per NFPA 13. If pressure loss of 1.5 psi (0.1034 bar) or greater occurs, repair
leaks.
F. Hydrostatic Test:
The dry system, including sprinkler piping and sprinklers shall be hydrostatically tested at 200 psi (13.8 bar) and maintained for 2
hours, in accordance with NFPA 13. Systems normally subjected to working system pressures in excess of 150 psi (10.3 bar) shall be
tested at a pressure of 50 psi (3.45 bar) in excess of system working pressure.
G. Placing the valve in Service:
When the dry pipe system is ready to be placed in service, verify that all equipment is adequately heated and protected to prevent
freezing and physical damage.
1. Verify that the water supply main control valve supplying the dry valve is closed.
2. Close the prime valve.
3. Open the main drain valve.
4. Drain all water from the dry pipe system. If the system has operated, or if water has entered the system, allow enough time
to completely drain the system.
5. Close the main drain valve.
6. Open the flow test valve.
7. Establish air pressure on the system.
8. When air pressure has been established, open the priming valve. Prime water pressure will enter and expand the valve's
internal diaphragm assembly onto the valve seat, effectively closing the valve. Verify prime pressure has been established on
the prime pressure gauge.
Form No. F_011110 17.04.27 Rev 17.1
TECHNICAL DATA
The viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
3 /min at 10 psi (0.154 m
HIGH
AIR
1
COM
1 2
WITH NORMAL SYSTEM
LOW
PRESSURE APPLIED HIGH
AIR
- TERMINAL 1 WILL CLOSE
ON PRESSURE INCREASE.
DWG# 930-2
3 /min at 0.7 bar), NFPA 13 does not require an air maintenance device.
FIELD ADJUSTMENTS:
Alarm Pressure Switch: The operating point of the switch can be
adjusted to any point between 4 psi (0.27 bar) and 8 psi (0.55 bar)
by turning the adjustment knob(s) clockwise to raise the actuation
point or counter-clockwise to lower the actuation point.
Air Supervisory Switch: The operating point of the switches
can be adjusted to any point between 10 psi (0.7 bar) and 60 psi
(4.1 bar) by turning the adjustment knob(s) clockwise to raise the
actuation point or counter-clockwise to lower the actuation point.
The high and low switches are adjusted independently.
Figure 5 - Pressure Adjustment
2" MoDEL G-2000 Dry vALvE
rISEr ASSEMBLy
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