9
5.
The inspector’s test connection should contain a globe
valve (normally closed), which can be opened to simulate
the actuation of a sprinkler.
5a.
Locate the inspector’s test connection at the most
hydraulically demanding location in the release system.
NOTE:
Multiple restrictions on the inspector’s test may
slow the air decay rate, causing the system to respond
slower than required.
5b.
The inspector’s test connection should terminate
with an orifice equal to the smallest orifice in the releasing
system.
5c.
The inspector’s test connection is used to ensure that
water gets to the most remote part of the system within
60 seconds.
6.
When shop air or a tank-mounted air compressor is
installed, the air maintenance trim assembly
MUST
be
used. The air maintenance trim assembly provides proper
air regulation to the sprinkler system.
6a.
Set the air regulator to 13 psi (90 kPa).
Proper Air Supplies for Series 758
Preaction Valves Used with Series
79N Electric/Pneumatic Actuators:
1.
When a riser or base-mounted air compressor supplies
air to a system using a Series 79N Electric/Pneumatic
Actuator, it is not necessary to use the air maintenance
trim assembly with the air regulator. In this case, the air-
line of the compressor connects to the trim at the fitting
where the air maintenance trim is normally installed (refer
to the trim drawing).
NOTE:
The use of an air regulator
with a base or riser-mounted compressor could cause
short cycling, resulting in premature wear of the compres-
sor.
2.
Due to the large on/off differential available for pressure
switches that control base-mounted compressors, adjust
the compressor‘s pressure switch so that the "ON" con-
tact is set at 13 psi (90 kPa).
Proper Air Supplies for Series 758
Preaction Valves Used with Series
79N Electric/Pneumatic Actuators
and Series 746 Dry Accelerators:
1.
When a Series 746 Dry Accelerator is used with the
Series 79N Electric/Pneumatic Actuator, the air mainte-
nance trim assembly
MUST
be used with the air regula-
tor.
2.
In the event that a compressor becomes inoperative, a
properly sized tank-mounted air compressor provides the
greatest protection for systems that use a Series 746 Dry
Accelerator. In this situation, air can be supplied continu-
ously to the sprinkler system for an extended time period.
IMPORTANT INSTALLATION
INFORMATION
1.
For proper operation and approval, the Series 758 Pre-
action Valve must be installed in accordance with the
specific trim diagrams.
NOTE:
Victaulic provides specific
trim drawings for installations that involve a Series 746
Dry Accelerator.
2.
Before installing the Series 758 Preaction Valve, flush
the water supply piping thoroughly to ensure that no for-
eign material is present.
3.
The Series 758 Preaction Valve
MUST NOT
be located
in an area where the valve is subject to freezing tempera-
tures or physical damage.
4.
It is the owner’s responsibility to confirm material com-
patibility of the Series 758 Preaction Valve, trim, and asso-
ciated accessories when a corrosive environment or
contaminated water is present.
5.
Series 758 Preaction Valves can be installed in the ver-
tical position with the arrow on the body pointing upward
or horizontally with the cover plate facing upward.
NOTE:
A trim drawing for the horizontal configuration
can be obtained by contacting Victaulic.
6.
Air or nitrogen supply to the dry piping system must be
clean, dry, and oil-free.
7.
Air supplies must be regulated, restricted, and continu-
ous.
NOTE:
Victaulic recommends the use of an air main-
tenance device on any system with an automatic air
supply.
8.
When the Series 758 Preaction Valve is used with a
water motor alarm, it is recommended that the valve con-
tain an uninterrupted, low-pressure alarm that is installed
on the piston charge line downstream of the check valve.
DISCONTINUED
PRODUCT