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INSTALLING YOUR FURNACE
ORIFICE SIZES
The efficiency rating of this appliance is a product thermal
efficiency rating determined under continuous operating
conditions and was determined independently of any
installed system. For elevations above 2,000 feet, reduce
ratings 4% for each 1,000 feet above sea level.
FURNACE TECHNICAL INFORMATION
INPUT
MODEL
GAS
RATING
NUMBER
TYPE
BTU/hr.
C255H
NATURAL
25,000
C256H
PROPANE
25,000
C355H
NATURAL
35,000
C356H
PROPANE
35,000
C505H
NATURAL
50,000
C506H
PROPANE
50,000
GAS CONVERSION KITS
NATURAL GAS TO PROPENE GAS
8913
255H / 256H SERIES WITH WILLIAMS BRAND GAS VALVE
8914
355H / 356H SERIES WITH WILLIAMS BRAND GAS VALVE
8909
505H / 506H SERIES WITH WILLIAMS BRAND GAS VALVE
GAS CONVERSION KITS
PROPANE GAS TO NATURAL GAS
8915
255H / 256H SERIES WITH WILLIAMS BRAND GAS VALVE
8916
355H / 356H SERIES WITH WILLIAMS BRAND GAS VALVE
8912
505H / 506H SERIES WITH WILLIAMS BRAND GAS VALVE
GAS PIPING
The gas supply line must be of adequate size to handle the
Btu/hr. requirements and length of the run for the unit being
installed.
Determine the minimum pipe size from Figure 13, based on
the length of the run from the gas meter to the unit.
All piping must comply with local codes and ordinances
or with the National Fuel Gas Code (ANSI Z223.1 NFPA No.
54), whichever applies. (In Canada: CAN/C.GA B149). Refer
to FIGURE 14 for the general layout of the unit. It shows the
basic fittings needed.
The following rules apply:
1.
Use new, properly reamed steel or black iron pipe and
fittings free of metal chips and debris that are approved by
local codes. Metal chips and debris can damage the valve.
18
COZY TOP VENT GRAVITY GAS WALL HEATER
HEATING
MAIN BURNER ORIFICE
CAPACITY
RATING
DRILL
DECIMAL QUANTITY
BTU/hr.
17,870
#43
0.089
17,870
.057"
23,700
#36
0.106
23,700
.069"
36,900
.091"
36,900
.058"
2.
Do not thread pipe too far. Valve distortion or malfunction
may result from excess pipe within the gas control valve.
Apply a moderate amount of good quality dope to the
pipe only. Leave the two end threads bare. Figure 15
3.
Use ground joint unions.
4.
Install a drip leg (sediment trap) to trap dirt and moisture
before it can enter the gas valve. The nipple must be a
minimum of 3-inches long.
5.
Install a manual shutoff valve.
6.
Provide a 1/8" NPT test gauge connection immediately
before the gas supply connection to the furnace.
FIGURE 13 - PIPE CAPACITY
1
1
PIPE CAPACITY - BTU/hr. WITH FITTINGS
1
1
LENGTH
2
OF PIPE
FEET
2
20
40
60
LENGTH
OF PIPE
FEET
20
40
60
GAS CONNECTION
If the installation is for propane gas, have the propane installer
use a two stage regulator and make all the connections from
the storage tank.
Use two pipe wrenches when making the connection to the
valve to prevent turning and/or damage to the valve.
Connections between the manual shutoff valve and burner
control assembly can be made with an A.G.A./C.G.A. design
certified flexible connector if allowed by local codes. Drip leg
and ground joint unions are still required.
Tighten all joints securely.
Test all piping for leaks. When checking gas piping to the
furnace with gas pressure less than 1/2 PSI, shut off manual
gas valve to the furnace. If gas piping is to be checked with
the pressure at or above 1/2 PSI, the furnace and manual
shutoff valve must be disconnected during testing. (SEE
WARNING). Apply soap solution (or a liquid detergent) to
each joint. Bubbles forming indicate a leak. Correct even the
slightest leak at once.
NATURAL GAS
PIPE SIZE
3/4"
1/2"
190,000
92,000
130,000
63,000
50,000
105,000
PROPANE
PIPE SIZE
3/4"
1/2"
393,000
189,000
267,000
129,000
103,000
217,000
1"
350,000
245,000
195,000
1"
732,000
504,000
409,000
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