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regulator is required on the propane tanks.
Check inlet supply pressure at the unit and Piping must be gas tight and a non-hardening
upstream of the gas control. Make sure pipe compound resistant to the actions of LP
the inlet supply pressure for natural gas is gas must be used.
6-7in. w.c. (1.2-1.7kPa) and 12-14in. w.c.
(3.0-3.5kPa) for LPG.
Supply piping, including union and external
shutoff valve, are not provided.
Purging air from gas lines and piping
must be done in accordance to the instr-
GAS PRESSURE
S
uctions outlined in ANSI Z223.1-latest Table 3 Pressures
edition CAN/CGA-B149 codes. MAN.
PRESS.
Never
exceed 14in. w.c. (3.5kPa) gas
IN. W.C.
pressure to the controls on the unit (kPa)
heater.
NAT. 3.5 (.87) 14.0 (3.5) 6.0 (1.2)
LPG 10.0 (2.5) 14.0 (3.5) 11.0 (2.7)
The gas line should be as short as possible, be
of adequate size to prevent undue pressure drop The manifold pressure may be measured by
and never be smaller than the connection removin
g
the pipe plu
g
on the downstream
provided at the heater. Consult the local utility for side of the gas control and connecting a water
complete details on special requirements in manometer.
sizing gas piping. See Table 5 on page 12.
Only a small variation in gas input may be
Connect the gas pipe to the heatersft. control, made by adjusting the regulator. In no case
providing a ground joint union to the controls and should the final manifold pressure var
y
b
y
more
manifold. Provide a drip le
g
. See fi
g
ure 7. An than 0.3" w.c. (.1kPa) from the above specified
additional manual shutoff valve with a 1/8in. (.3cm) pressures shown in Table 3. Where the
N.P.T. plugged tapping accessible for test gage supplied gas pressure has a greater specific
connection shall be installed external to the unit. gravity use the multiplying factors shown in
Table 4.
FIGURE 7 PIPING TO CONTROLS
Table 4 SPECIFIC GRAVITY
CONVERSION FACTORS
Multiply factors to be used with Table 4 when
the specific gravity of gas is other than 0.60.
Natural Gas LP (Propane) Gas
Specific Specific
Gravity Factor Gravity Factor
0.55 1.04 1.50 0.633
0.60 1.00 1.53 0.626
0.65 0.962 1.60 0.612
Make sure the piping is pitched upward Follow these two (2) methods for input
towards the unit at least 1/4in. (.6cm) per 15ft. adjustment:
(4.6m) of horizontal run.
Method A - Meter Timing
To check a heaters input rate, observe the gas
CAUTION
GAS
SUPPLY PRESS.
INCHES W.C. (kPa)
MAX. MIN.
11