Installation guide

4. PRE-EXISTING COMMON VENT CHECK
If the installation of this new combination gas heat/electric
cool unit involves removing an existing gas-fired furnace
from a common vent system with other gas-fired
appliances (gas-fired hot water heater, etc.), the existing
vent system must be checked and inspected by a qualified
technician. The qualified technician can determine if the
existing vent system will properly vent the flue products of
the remaining gas-fired appliances. In many cases, the
existing vent system may be oversized for the remaining
appliances.
5. GAS SUPPLY AND PIPING
NOTE: Because there are many types of liquified petroleum
(propane (LP)) gases, the term propane (LP) as used in this
manual refers to propane gas. If you intend to use any type
of propane (LP) gas, proper precautions MUST be used in
the handling, piping, and use of such gas. NOTE: In
Canada, installations MUST be performed by licensed
propane (LP) installers.
The UL rating plate located on the side panel on the unit
contains the model number, type of gas, gas input rating,
and other important information.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Makecertainthe unitisequippedto operateonthe type of
gasavailable.Models designated as natural gas areto be
used with natural gas only. Models designated for use
with liquefied petroleum (propane (LP)) gas are shipped
with orifices sized for commercially pure propane gas.
They MUST not be used with butane or a mixture of
butane and propane unless properly sized orifices are
installed by a licensed propane (LP) installer.
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 for natural gas
from the table in FIGURE 5 or FIGURE 6. Base the length
of the run from the gas meter or source to the unit.
Gas Pipe Size
Btu ratings of all other gas appliances MUST be considered
for sizing of main gas line. Check gas line to installation for
compliance with local codes or, in the absence of local
codes, with the National Fuel Gas Code NFPA
54-2005/ANSI Z223.1-2005 or in Canada the National
Standard CAN/CGA B149-1 or current editions.
I Gas Pipe Size, Length and Btu/hr Capacity
FIGURE 5 for Schedule 40 Iron Pipe tEn_llish/
NATURAL GAS
Pipe Length Btu/hr (in thousands)
(includes
Fittings) 3/4" 1 " 11/4" 11/2" 2"
20' 190 350 730 1,100 2,100
40' 130 245 500 760 1,450
60' 105 195 400 610 1,150
propane (LP) GAS
Pipe Length Btu/hr (in thousands)
(includes
Fittings) 1/2" 3/4" 1" 11/4" 11/2"
20' 189 393 732 1,496 2,299
40' 129 267 504 1,039 1,559
60' 103 217 409 834 1,275
I Gas Pipe Size, Length and Btu/hr Capacity
FIGURE 6 for Schedule 40 Iron Pipe (English)
NATURAL GAS
Pipe Length kW**
(includes
Fittinqs) 3/4" 1 " 11/4" 11/2" 2"
6.1m 56 103 214 322 615
12.2m 38 72 147 223 425
18.3m 31 57 117 179 337
Propane (LP) GAS
Pipe Length kW**
(includes
Fittings) 1/2" 3/4" 1 " 11/4" 11/2"
6.1m 55 115 215 438 674
12.2m 38 78 148 305 457
18.3m 30 64 120 244 374
**kW (Kilowatts) is the metric equivalent of Btu/hr.
PIPING AT UNIT
Connections
In the state of Massachusetts:
- This product must be installed by a licensed Plumber or
Gas Fitter.
- When flexible connections are used, the maximum
length shall not exceed 36 inches.
- When lever type gas shutoffs are used they shall be
T-handle type.
- The use of copper tubing for gas piping is not approved
by the state of Massachusetts.
NOTE: The rules listed apply to natural and propane (LP)
gas pipe installations.
1. If installation is for propane (LP) gas, have propane gas
installer use TWO-STAGE REGULATION and make
all connections from storage tank to unit.
2. Use black iron or steel pipe and fittings or other pipe
approved by local code.
3. tf copper tubing is used, it MUST comply with limitation
set in Fuel Gas Code.
NOTE: If a flexible gas connector is used, it MUST be
acceptable to local authority. Connector MUST NOT be
used inside the furnace or be secured or supported by the
furnace or ductwork. Do not use a connector which has
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