AIR SUPPLY REQUIREMENTS
Systems with air pressure higher than 18 psi/124 kPa require the
a ddition of a Series 746-LPA Dry Accelerator.
COMPRESSOR REQUIREMENTS AND SETTINGS FOR SYSTEMS
INSTALLED WITH SERIES 746-LPA DRY ACCELERATORS
0
2
4
6
8
10
12
System Capacity (in gallons)
Requir
ed F
lo
w
R
a
te
(
C
F
M
)
550
300
50
800
1050
1300
1550
1800
20 psi/138 kPa
13 psi/90 kPa
In the event a compressor becomes inoperative, a properly sized tank-
mounted air compressor provides the greatest protection for systems
installed with a Series 746-LPA Dry Accelerator. In this situation, air can
be supplied continuously to the sprinkler system for an extended time
period.
NOTE:
The Series 757 Regulated AMTA should be used with a
tank-mounted air compressor to supply air to a system when the Series
746-LPA Dry Accelerator is used. The use of an air regulator with a
base or riser-mounted compressor could cause short cycling, resulting
in premature wear of the compressor.
Set the air regulator of the Series 757 Regulated Air Maintenance Trim
Assembly (AMTA) to a minimum of 13 psi/90 kPa.
The air regulator of the Series 757 Regulated AMTA is a relief-type
design. Any pressure in the system that is above the set point of the air
regulator will be released. Therefore, charging the air regulator above
the set point could cause premature operation of a system installed with
a Series 746-LPA Dry Accelerator.
THE SERIES 757P AIR MAINTENANCE TRIM ASSEMBLY WITH
PRESSURE SWITCH MUST NOT BE USED ON A SYSTEM
INSTALLED WITH A SERIES 746-LPA DRY ACCELERATOR.
INSTALLATION
For proper operation and approval, the valve and any accessories must
be installed in accordance with the specific trim diagrams included with
the shipment.
CAUTION
Make sure no foreign material gets into the pipe nipples and
openings in the accelerator.
If using any material other than Teflon* tape, use extra
caution so that no material gets into the trim.
Failure to follow these instructions could cause improper valve
operation, resulting in personal injury and/or property damage.
•
•
1.
Apply a small amount of pipe joint compound or Teflon* tape to
the external threads of all threaded pipe connections. DO NOT get
any tape, compound, or other foreign material into the pipe nipples
and openings in the accelerator.
2.
Assemble the Series 746-LPA Dry Accelerator per the drawing
provided.
3.
Install the Series 746-LPA Dry Accelerator into the trim of the
actuator in the location designated on the applicable trim draw-
ing. Make sure the end of the Series 746-LPA with the vent seal
“button” is facing toward the trim of the actuator.
PLACING THE SYSTEM IN SERVICE
When the system is ready to be placed in service, refer to the instal-
lation, maintenance, and testing manual for the applicable valve for
detailed setup instructions.
*TEFLON IS A REGISTERED TRADEMARK OF THE DUPONT COMPANY.
I-746.LPA_2
Series 746-LPA
INSTRUCTIONS FOR INSTALLING AND REPAIRING SERIES 746-LPA DRY ACCELERATORS
I-746.LPA
INSTALLATION AND REPAIR KIT INSTRUCTIONS
www.victaulic.com
VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2006 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
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