Technical data

TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Road, Hastings MI 49058
Telephone: [phone] Technical Services 877-384-5464 Fax: [phone] Email: [e-mail]
ESFR PRE-PRIMED SINGLE
INTERLOCK PREACTION
COLD STORAGE SYSTEM
Page 53
March 7, 2008
11. Air / Vacuum Vent
The Viking AV-1 device is a float operated automatic
air vent that is installed at high points of the sprinkler
system where air pockets can accumulate. As the sys-
tem fills, air is automatically vented through the orifice
of the vent valve. When the system is full, the water or
antifreeze solution raises the float due to buoyancy and
shuts off the outlet orifice. As air throughout the system
accumulates at the high points of system piping, it will
be automatically expelled to provide air-free system
piping.
Airflow during venting is restricted due to differential pressure across vent orifice. It is recom-
mended to slow fill the system initially to minimize the buildup of air in the system. See Table
16 for air flow capacity at various differential pressures.
Having the AV-1 installed on the end of each high-point branch line and/or main provides quick-
er and more complete drainage of system piping. This is because during drainage of system
piping, the AV-1 will open and allow air to enter and break the vacuum inside the piping.
Table 15 - Troubleshooting Guide
Problem Possible Causes Remedies
Unit will not turn on.
1) Power disconnected.
2) Blown fuse.
1) Check power at supply and unit, and correct.
2) Check fuses, replace as required, and determine cause of blown
fuse.
Pump does not operate
in Automatic mode when
CS-1 pressure drops.
1) No power to unit.
2) Liquid level in tank low.
3) Magnetic starter overload tripped.
4) Time delay active.
5) Pump motor defective.
1) Verify power at unit terminal block.
2) Fill tank to proper height.
3) Verify and fi x cause of overload. Press reset button on starter.
4) Wait 10 minutes for time delay to time out. Correct leaks in
system.
5) Replace.
Pump does not operate
in Automatic mode when
system valve opens.
1) Pump operates on manifold
pressure, not system pressure. System
pressure switch setting is higher than
the CS-1 pressure switch setting.
1) Verify system pressure switch setting is correct. The CS-1
pressure switch setting must not be adjusted higher. Adjust CS-1
switch setting lower if approved by factory.
Failure to pump.
1) Supply container empty.
2) Incorrect valve position.
3) Pump rotation backward.
4) Insuffi cient head pressure to pump
inlet.
5) Pump not up to speed.
6) Clogged suction line.
7) Air in suction line.
1) Connect full supply container.
2) Correct valve position per instructions.
3) Correct pump rotation.
4) Raise supply container.
5) Check voltage.
6) Inspect and clean Y-Strainer.
7) Check for air in pump suction line.
Excessive power
consumption.
1) Pump not fully broken in.
2) Mechanical damage.
1) Pump normally draws higher current during break-in period. This
condition will work itself out after several weeks.
2) Turn pump over by hand. If there are tight spots after break-in,
call Technical Services.
Other pump-related
problems.
If other pump related problems are suspected, call the Viking Technical Services Department at 1-877-384-
5464.
Pump stops before
desired system pressure.
Discharge pipe is too small or there is a
buildup of back pressure.
1) Increase pipe size.
2) Increase dS1 setting on pump switch.
3) Make sure dr1 setting is set to 0.50.
H. Inspections, Tests and Maintenance