DIRECT VENT GRAVITY GAS WALL HEATER 13
CHECKING THE GAS PIPING
Test all piping for leaks. When checking gas piping to the furnace
with gas pressure at less than 1/2 PSI, shut o manual gas
valve to the furnace. If the gas piping is to be checked with the
pressure at or above 1/2 PSI, the furnace and manual shuto
valve must be disconnected during testing. Apply a soap solution
(or a liquid detergent) to each joint. Bubbles forming indicate a
leak. Correct even the slightest leak at once.
WARNING: Danger of property damage, bodily
injury or death. Never use a match or open ame to test for
leaks. Never exceed specied pressures for testing. Higher
pressures may damage the gas valve and cause over ring
which may result in combustion chamber failure. Liqueed
petroleum gas (PRPN GAS) is heavier than air and it will
settle in any low area, including open depressions and it
will remain there unless area is ventilated. Never attempt
start-up of the unit before thoroughly ventilating the area and
smelling near the oor for gas odor.
When an existing category I heater is removed or replaced, the
original venting system may no longer be sized to properly vent
the attached appliances
All installations in the State of Massachusetts must use
the following requirements when installing, maintaining or
operating direct-vent propane or natural gas-red space heaters.
For direct-vent appliances, mechanical-vent heating appliances
or domestic hot water equipment, where the bottom of the vent
terminal and the air intake is installed below four feet above
grade the following requirements must be satised:
1. If there is not one already present, on each oor level
where there are bedroom(s), a carbon monoxide
detector and alarm shall be placed in the living area
outside the bedroom(s). The carbon monoxide detector
shall comply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall be located in the
room that houses the appliance or equipment
and shall:
a. Be powered by the same electrical circuit as the
appliance or equipment such that only one service
switch services both the appliance and the carbon
monoxide detector.
b. Have battery back-up power;
c. Meet ANSI/UL 2034 Standards and comply with NFPA
720 (2005 Edition); and
d. Have been approved and listed by a Nationally
Recognized Testing Laboratory as recognized under
527 CMR.
INSTALLATIONS IN THE STATE
OF MASSACHUSETTS
A CARBON MONOXIDE DETECTOR SHALL:
a. Be located in the room that houses the appliance
or equipment;
b. Be either hard-wired or battery powered or both; and
c. Shall comply with NFPA 720 (2005 Edition).
3. A product-approved vent terminal must be used, and if
applicable, a product-approved air intake must be
used. Installation shall be in strict compliance with the
manufacturer’s instructions. A copy of the installation
instructions shall remain with the appliance or
equipment at the completion of the installation.
4. A metal or plastic identication plate shall be mounted
at the exterior of the building, four feet directly above
the location of vent terminal. The plate shall be of
sucient size to be easily read from a distance of eight
feet away, and read “Gas Vent Directly Below”.
FIGURE 14
GAS PIPE SIZES
NATURAL GAS PIPE CAPACITY - BTU/hr. (includes ttings) PIPE SIZE
LENGTH OF PIPE - FT.
1/2" 3/4" 1"
20 92,000 190,000 350,000
40 63,000 130,000 245,000
60 50,000 105,000 195,000
PROPANE GAS PIPE CAPACITY - BTU/hr. (includes ttings) PIPE SIZE
LENGTH OF PIPE - FT.
1/2" 3/4" 1"
20 189,000 393,000 732,000
40 129,000 267,000 504,000
60 103,000 217,000 409,000
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