11
GAS CONNECTION
B. GAS PIPING
1. Run the gas supply line in accordance with all applicable codes.
2. Locate and install manual shutoff valves in accordance with state and local requirements.
C. GAS TABLE
Refer to Table (1) to size the supply piping to minimize pressure drop between meter or regulator
and unit.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psi or Less and a
Pressure Drop of 0.3 Inch water Column
(TABLE 1)
(Based on a 0.60 Specific Gravity Gas)
It is recommended that a soapy solution be used to detect leaks. Bubbles will appear on the pipe to
indicate a leak is present. The gas piping must be sized for the proper flow and length of pipe, to
avoid pressure drop. Both the gas meter and the gas regulator must be properly sized for the total
gas load. If you experience a pressure drop greater than 1" WC, the meter, regulator or gas line is
undersized or in need of service. You can attach a manometer to the incoming gas drip leg, by
removing the cap and installing the manometer. The gas pressure must remain between 3.5" and 14"
during stand-by (static) mode and while in operating (dynamic) mode.
If an in-line regulator is used,
it must be a minimum of 10 feet from the Munchkin. It is very important that the gas line is prop-
erly purged by the gas supplier or utility. Failure to properly purge the lines or improper line siz-
ing, will result in ignition failure.
This problem is especially noticeable in NEW LP installations and
also in empty tank situations. This can also occur when a utility company shuts off service to an area
to provide maintenance to their lines. This gas valve must not be replaced with a conventional gas
valve under any circumstances. As an additional safety feature, this gas valve has a flanged con-
nection to the Venturi and blower.
Nominal
Iron Pipe Internal
Length of Pipe (Feet)
Size
Diameter
(inches)
(inches) 10
20
30
40
50
60
70
80
90
100
125
150
175
200.
3/4
.824
278
190
152 130 115
105
96
90
84
79
72
64
59
55}
BTU'S
1
1.049
520
350
285 245 215
195 180
170
160
150
130
120
110
100}
PER
1 1/4
1.380
1,050
730
590 500 440
400 370
350
320
305
275
250
225
210}
HOUR
1 1/2
1.610
1,600
1,100
890 760 670
610 560
530
490
460
410
380
350
320}
X 1,000
n
WARNING
Failure to follow all precautions could result in fire, explosion or death!
D. GAS VALVE CONVERSION
Gas conversion kits may be ordered through your local Heat Transfer Products Inc. Distributor.
n
DANGER
ONLY AN HTP, U.L. APPROVED GAS VALVE CONVERSION KIT SHOULD BE USED TO DO A GAS
CONVERSION ON THIS UNIT. UNDER NO CIRCUMSTANCES SHOULD ANYONE OTHER THAN A
LICENCED CONTRACTOR PERFORM THIS GAS VALVE CONVERSION.
FAILURE TO HEED THIS PRECAUTION
WILL
RESULT IN SERIOUS INJURY OR DEATH!
