GQ pg. 24
GAS COCK
(SUPPLIED BY OTHERS)
DRIP LEG
(13CM)
(38 CM)
(17 CM)
5"
15"
6-1/2"
RECOMMEND GAS CONNECTION ARRANGEMENT USING A FLEXIBLE GAS CONNECTOR.
TEST POINT 'A'
(INLET)
SAFETY
CHAIN
MANIFOLD
PRESSURE
ADJUSTMENT
(WHITE RODGERS
VALVE)
TEST POINT 'B'
(OUTLET)
MANIFOLD
PRESSURE
ADJUSTMENT
(ROBERT SHAW
VALVE)
LOCAL CODES MAY REQUIRE
AN ADDITIONAL SHUT-OFF COCK
BE INSTALLED IN THE GAS LINE
AHEAD OF THE DRIP LEG
WHEN GAS PRESSURE
EXCEEDS 14" W.C.
(35 CM W.C.)
A FIRST STAGE
REGULATOR
MUST BE
INSTALLED.
1/2" (1.27 CM)
O.D. FLEXIBLE
GAS CONNECTOR
24" (61 CM) LONG
STAINLESS STEEL
GAS SUPPLY AND GAS PRESSURE
GAS SUPPLY PIPING
INLET GAS PRESSURE
•
Inlet gas pressure must be measured on the inlet side of the
valve at Test Point ‘A’ in the supply piping and must conform to
the following:
GAS TYPE
RATING
MBTUH
(kW)
PRESSURE
In. WC
(cm WC)
MINIMUM:
NATURAL GAS
40 to 125
(12 to 37)
6
(15)
NATURAL GAS
130 to 200
(38 to 59)
7
(18)
LP/PROPANE GAS
ALL
11
(28)
•
Piping must be installed in accordance with local codes and/or
ANSI Z223.1-latest edition (NFPA 54-latest edition), National
Fuel Gas Code.
•
Piping must have drip leg and a ground joint union.
•
All pipe connections must have pipe joint compound, resistant to
LP/propane gas action.
•
Isolate regulators, flexible gas connectors, and heaters during
high-pressure leak testing.
•
All gas lines must be purged before startup.
•
Use only agency approved flexible gas connector with shut-off
cock for connecting to heater. (SEE CAUTION)
•
Use swing or swivel joint in addition to rigid piping if local codes
prohibit use of a flexible gas connector.
•
Local codes may require additional shut-off cock ahead of the
drip leg.
MAXIMUM:
CAUTION: “LAZY LOOP”
NATURAL GAS
LP/PROPANE GAS
ALL
14
(35)
IMPORTANT
•
Stress from expansion and contraction of heater may cause
excessive wear on the gas connection.
•
If local codes permit, flexible gas connectors must be in a “Lazy
Loop”, arrangement as shown on drawing below.
•
It is important to maintain dimensions on drawing below.
•
Gas pressure at Test Point ‘A’ cannot be more than 14 inches of
water column (in. WC) (½PSI) (35 cm WC), confirmed by actual
field test. (Heater on or off)
Heater length
Expansion
Heater length
Expansion
HIGH INLET GAS PRESSURE
10-20 ft
(3.1-6.1 m)
1.1 in
(2.8 cm)
45-50 ft
(13.7-15.2 m)
2.1 in
(5.3 cm)
25-30 ft
(7.6-9.1 m)
1.5 in
(3.8 cm)
55-60 ft
(16.8-18.3 m)
2.4 in
(6.1 cm)
35-40 ft
(10.7-12.2 m)
1.8 in
(4.6 cm)
65-70 ft
(19.9-21.3)
2.7 in
(6.7 cm)
•
For pressure greater than 14 in. WC (35 cm WC) a positive
lockout type high-pressure regulator must be installed in the gas
line ahead of the burner.
•
Always check local codes for gas venting requirements for high-
pressure regulators.
•
Over-protection pressure devices (OPD’s) may be required in
certain jurisdictions.
•
High inlet gas pressure regulators will
NOT
turn off the flow of
gas.
GAS PRESSURE MEASUREMENTS
MANIFOLD OUTLET GAS PRESSURE
•
Fluctuations in inlet pressure can alter manifold pressure.
•
For manifold pressure adjustment locations, refer to drawing below.
•
Remove pipe plug from Test Point ‘B’; insert a barb fitting connected to the manometer.
•
For all heaters remove the slotted cap screw.
•
Turn adjustment screw clockwise to increase pressure or counterclockwise to decrease
pressure. Screw may require a flat head screwdriver or a 3/32” (2.38mm) hex key.
RATING: MBTUH (kW)
MANIFOLD PRESSURE
40 to 100 (12 to 29)
3.5 in. WC (8.9 cm WC) (Nat./LP)
•
Use only water or red oil manometer
to make measurements – NOT A
DIAL GAUGE.
•
Make
ALL
measurements and
adjustments when this heater and
ALL
other gas burning equipment
connected to the same gas meter are
operating at maximum capacity.
105 to 200 (31 to 59)
5.0 in. WC (12.7 cm WC) (Nat./LP)
CAUTION
Excessive torque on the burner gas inlet manifold pipe may cause damage to burner. Always use two (2) wrenches when making pipe
connections. Important: Check for leaks with soap solution. DO NOT USE FLAMES! Leak test solution may cause corrosion. After test,
water rinse to clear out any remaining solution.
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