Specifications

28.
6. Install 1¼” Nipple (#48, Fig. 7) or 2” nipple (#48, Fig. 8) in
tapped drain opening and connect balance of this trim line.
7. Install ¾” x ¼” reducing bushing (#53, Fig. 7 or #53, Fig. 8)
in the lower-most tapped opening at the rear of the Deluge
Valve and connect the balance of this trim line.
8. Install ¾” nipple (#44, Fig. 7 or #43, Fig. 8) in the upper-
most tapped opening at the rear of the Deluge Valve and
connect the balance of this trim line.
Connect the air supply to the air inlet side of the Model LP
Dry Pilot Line Actuator as shown in Fig. 7 or Fig. 8. Table
A specifies the air pressure to be used in a dry pilot line.
The level of air pressure is adjusted by removing the cap
nut on the end of the Relief Valve (#56, Fig. 7 or #56, Fig. 8)
and turning the now exposed slotted adjusting screw clock-
wise to increase pressure or counterclockwise to reduce it.
Replace the cap nut after the correct pressure setting has
been made at 5 psi above the maximum pilot line pressure
required by Table A. An appropriate automatic pressure
maintenance device must be used to safeguard against the
Deluge Valve tripping due to air pressure leaks in the dry
pilot line. See Bulletin 254 for pressure maintenance device
information.
Install the dry pilot line as required. Wire the low air pres-
sure switch (#5, Fig. 7 or #5, Fig. 8) to an annunciating de-
vice or control panel. This low air pressure switch should be
set to open at an air pressure which is slightly lower than the
“Not Less Than” values found in Table A.
Table A
Water Pressure
psi (bar)
Pneumatic Pressure to be
Pumped into Sprinkler System
psi (bar)
Maximum Not Les Than Not More Than
20 (1.4) 8 (0.6) 10 (0.7)
30 (2.1) 10 (0.7) 14 (1.0)
50 (3.4) 12 (0.8) 16 (1.1)
75 (5.2) 13 (0.9) 17 (1.2)
100 (6.9) 15 (1.0) 19 (1.3)
125 (8.6) 16 (1.1) 20 (1.4)
150 (10.3) 17 (1.2) 21 (1.4)
175 (12.1) 18 (1.2) 22 (1.5)
200 (13.8) 19 (1.3) 23 (1.6)
225 (15.5) 21 (1.4) 25 (1.7)
250 (17.2) 22 (1.5) 26 (1.8)
275 (19.0) 23 (1.6) 27 (1.9)
300 (20.7) 24 (1.7) 28 (1.9)
Note: During system set-up, a higher pneumatic pressure
may be required in order to properly set the Model LP Dry
Pilot Line Actuator.
Model LP Dry Pilot Line Actuator Parts List
P/N 71030010
Item
No.
Part No. Description
Qty.
Required
1 94106936 Lower Housing 1
2 94106935 Upper Housing 1
3 96006905 Seat 1
4 92206311 Diaphragm 1
5 95106911 Facing Plate Assembly 1
6 96906311 Diaphragm Washer 1
7 94906406 Facing Plate Nut 1
8 95406901 Seat O-Ring 1
9 95606305 Bolt 6
10 96406902 Compression Spring 1
Maintenance – Model LP Dry Pilot Line Actuator
Refer to Figs. 11 & 15
If water constantly flows through the Model LP Dry Pilot
Line Actuator and into the drain, there is a leak in the seal
of the Actuator’s seat.
1. Close the main valve controlling water supply (Fig. 15) to
the Dry Pipe Valve and close off the air/nitrogen supply to
the sprinkler system. Close valve A (Fig. 15).
2. Drop pressure in the system by opening the ¼” globe valve,
valve E (Fig. 15), and remove the Actuator from the system.
3. Remove all six bolts (#9, Fig. 11) holding the Actuator to-
gether. Clean or replace the facing plate assembly (#5, Fig.
11) and seat (#3, Fig. 11).
4. Reassemble the Actuator, using a torque of 8 ft-lbs on the
facing plate nut (#7, Fig. 11) and 12 ft-lbs on the six bolts
(#9, Fig. 11). Use a cross-tightening pattern. Reinstall the
Actuator. Set up the Model DDX Deluge Valve as per the
section “Resetting Model DDX Deluge Valve System”.
Resetting Model DDX Deluge Valve Single
Interlock Preaction Systems
Refer to Figs. 7, 8, 13, 14 & 15.
1. Close the valve controlling water supply (Fig. 15) to the
Deluge Valve and close off the air supply to the sprinkler
system.
2. Close the pushrod chamber supply valve, valve A (Fig. 15).
3. Open main drain valve B (Fig. 15) and drain system.
4. Open all drain valves and vents at low points throughout
the system, closing them when flow of water has stopped.
Open valve D (Fig. 15). Note: The above steps accom-
plish the relieving of pressure in the pushrod chamber of
the Deluge Valve.
5. With valve F (Fig. 15) open, push in the plunger of ball drip
valve G (Fig. 15), forcing the ball from its seat, and drain the
alarm line.
6. With the Model B Manual Emergency Station, valve D (Fig.
15) open, push in and rotate the Deluge Valve’s external
reset knob (#14, Fig. 13 or #38, Fig. 14) clockwise, until you
hear a distinct noise indicating that the clapper has reset.
Note: The reset knob can be rotated only while pressure in
the pushrod chamber is vented to atmospheric conditions
(0 psig).