Gas Connections - Modine Manufacturing IPT Installation And Service Manual

INSTALLATION
Figure 14.1 - Common Venting Entering at
Different Levels
To Vent Termination
4" Vent Pipe
Figure 14.2 - Common Venting Utilizing a
4" x 4" x 6" Wye
To Vent Termination
4" Vent Pipe
4" x 4" x 6" WYE
Utilizing Outside Combustion Air (Optional)
1. An accessory combustion air intake collar is required for
connecting the combustion air piping to the burner box. For
outdoor installation, the air intake collar connects directly to
the accessory air intake cap.
2. All units may utilize a maximum of 20' of 4" O. D. fresh air
intake pipe with two (2) 90° elbows, 25' with one (1) elbow, or
30' with no elbows.
3. Modine recommends using 4" insulated (sealed) pipe or
Schedule 40 PVC pipe to provide fresh air and limit
condensation from forming on outer surface. A Modine-
specified accessory screened combustion air intake cap is
required.
4. Insure that air intake cap is protected from snow blockage.
5. Keep intake opening at least 5 feet from any exhaust vent
opening.
6. Where practical, the outside combustion air intake is
recommended to be in the same pressure zone as the vent
termination.

Gas Connections

WARNING
1. All field gas piping must be pressure/leak tested prior to
operation. Never use an open flame. Use a soap solution
or equivalent for testing.
2. Gas pressure to the appliance controls must never exceed
14" W.C. (1/2 psi).
3. To reduce the opportunity for condensation, the minimum
sea level input to the appliance, as indicated on the serial
plate, must not be less than 5% below the rated input.
4. A certified flexible connector must be used (local codes
permitting) as the method of connecting the heaters to the
gas supply to avoid placing stress on the gas supply line
due to the expansion of the low intensity infrared tubes
during operation.
14
6" Vent Pipe
4" Vent Pipe
6" Vent Pipe
4" Vent Pipe
CAUTION
1. Purging of air from gas supply line should be performed
as described in ANSI Z223.1 - latest edition "National Fuel
Gas Code", or in Canada in CAN/CGA-B149 codes.
2. When leak testing the gas supply piping system, the
appliance and its combination gas control must be
isolated during any pressure testing in excess of 14" W.C.
(1/2 psi).
3. The unit should be isolated from the gas supply piping
system by closing its field installed manual shut-off
valve.This manual shut-off valve should be located within
6' of the heater.
4. Turn off all gas before installing appliance.
1. Installation of piping must conform with local building codes,
or in the absence of local codes, of the National Gas Fuel
Code, ANSI Z223.1 (NFPA 54) – Latest Edition. In Canada,
installation must be in accordance with CAN/CGA-B149.1 for
natural gas units and CAN/CGA-B149.2 for propane units.
2. Piping to units should conform with local and national
requirements for type and volume of gas handled, and
pressure drop allowed in the line. Refer to Table 19.1 to
determine the cubic feet per hour (cfh) for the type of gas and
size of unit to be installed. Using this cfh value and length of
pipe necessary, determine the pipe diameter from Table 19.1.
Where several units are served by the same main, the total
capacity, cfh, and length of main must be considered. Avoid
pipe sizes smaller than 1/2". Table 19.1 allows for a 0.3" W.C.
pressure drop in the supply pressure from the building main
to the unit. The inlet pressure to the unit must be 6-7" W.C.
for natural gas and 12-14" W.C. for propane gas. The gas
supply pressure must never exceed 14" W.C. If the pressure
exceeds 14" W.C., a gas pressure regulator must be added
upstream of the combination gas valve. When sizing the inlet
gas pipe diameter, make sure that the unit supply pressure
can be met after the 0.3" W.C. has been subtracted. If the
0.3" W.C. pressure drop is too high, refer to the Gas
Engineer's Handbook for other gas pipe capacities.
3. Install a ground joint union with brass seat and a manual
shutoff valve adjacent to the unit for emergency shut-off and
easy servicing of controls, including a 1/8" NPT plugged
tapping immediately upstream of the gas supply connection
to the heater, accessible for test gauge connection. See
Figure 15.1.
4. Provide a sediment trap before each unit and in the line
where low spots cannot be avoided. (See Figure 15.1).
5. A certified, metallic stainless steel connector (local codes
permitting) of at least ¾" minimum ID by 36" long, must be used
as the method of connecting the heater to the gas supply line.
The connector must be certified to ANSI Z21.24/CSA 6.10. A
flexible connector avoids placing stress on the gas supply line
due to the thermal expansion of the unit while operating
Canadian installation codes do not permit the use of flexible
metallic connectors. In Canada, Installation Code CAN/
CSA-B149.1-05 requires the use of a Type I hose connector
certified to CSA CAN/CGA-8.1. Use a hose that is of the same
diameter and length as noted above. The certified flexible
connectors must be installed as illustrated in Figure 15.2, in one
plane, without any sharp bends, kinks, or twists. The gas
take-off from the drop line must be parallel to the burner gas
inlet connection.
6. Under no circumstances should the gas supply line to the
heater provide any assistance in the suspension of the
heater. Do not locate any gas service line directly above or
below the heater.
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