Engineered air DG SERIES User Manual

A DJ & DG MANUAL
20 of 34 May 12 R2
SAFETY SHUTOFF VALVE LEAK TEST:
Safety shutoff valves require a qualified technician to perform a leak (bubble) test to determine tightness of
closure on a least an annual basis. A very small amount of leakage is normal. Valve leakage rates
exceeding those noted in the table below require repair or valve replacement.
1. De-energize the control system.
2. Close the upstream manual gas valve.
3. Connect a ¼” (6mm) tube to the outlet
pressure tap on the safety shutoff valve.
4. Immerse the opposite end of the ¼” (6mm)
tube (cut to a 45° angle) vertically ½” (13mm)
into a clear container of water.
5. Count the number of bubbles appearing
during a 10 second period.
6. If the bubble rate is greater than that noted in
the table repair or replace the valve.
7. If bubble rate is less than noted in the table,
remove the ¼” (6mm) tube, reconnect the
outlet pressure tap plug.
8. Energize the control system and open
upstream manual gas valve.
9. After testing check all piping connections and
plugs for external leakage.
The table below indicates the maximum number of
bubbles in relation to the size and type of valve.
Manufacturer Pipe size (in.) Model Maximum leakage rate
(bubbles/10sec.)
1, 1¼ V4943, V8943 13
1½, 2 V4943, V8943 16
¾, 1, 1¼, 1½ V5055, V5097 14
Honeywell
2, 2½ ,3 V5055, V5097 24
¾ K3A551/651 6
1 K3A551/651 6
1 ¼ K3A551/651 7
ASCO
1 ½ K3A551/651 9
For valves not listed contact the valve manufacturer for testing procedure and acceptable leakage rate.
GAS MANIFOLD
It is recommended that at least once each year the safety devices should be checked. Follow operational
check at detailed in this manual.
The Safety Shut Off Valves must be tested on at least an annual basis or as per the manufacturer’s
recommendations which ever is less.
Regulators with vent terminals must have yearly cleaning of the screen.
1/2 (13mm)
CUT AT
45 DEGREE
ANGLE
JAR OR GLASS WITH WATER
1/4 IN (6MM) ALUMINUM OR
COPPER PILOT TUBING
1/4 (6MM) FLEXIBLE TUBING
GAS SUPPLY
UPSTREAM
MANUAL
GAS COCK
PVR SSOV
MANUAL
GAS COCK
DOWNSTREAM
TEST
TAP
LEAK
A B C ED
1
CAN ALSO BE A PERMANENT PETCOCK.
PRV = PRESSURE REGULATING VALVE.
2
USE ONLY ONE OF THE DOWNSTREAM TAPS ON THE SSOV.
SSOV = SAFETY SHUTOFF VALVE.
4
3
2
3
4
DOWNSTREAM
GAS COCK
MANUAL
1
F

Engineered air DG SERIES Specifications

General

Brand	Engineered air
Model	DG SERIES
Category	Heater
Language	English