York W)036 THRU 060 Specifications download pdf (Page 32)

542300-YIM-A-1009

32 Johnson Controls Unitary Products

Lp Units, Tanks And Piping

All gas heat units are shipped from the factory equipped for

natural gas use only. The unit may be converted in the field for

use with LP gas with accessory kit model number 1NP0440 or

1NP0485 (2 Stage).

All LP gas equipment must conform to the safety standards of

the National Fire Protection Association.

For satisfactory operation, adequate LP gas pressure must be

provided at the unit manifold under full load. Maintaining proper

gas pressure depends on three main factors:

1. The vaporization rate which depends on the temperature of

the liquid and the “wetted surface” area of the container(s).

2. The proper pressure regulation. (Two-stage regulation is

recommended).

3. The pressure drop in the lines between regulators and

between the second stage regulator and the appliance.

Pipe size required will depend on the length of the pipe run

and the total load of all appliances.

Complete information regarding tank sizing for vaporization,

recommended regulator settings, and pipe sizing is available

from most regulator manufacturers and LP gas suppliers.

Check all connections for leaks when piping is completed using

a soap solution. NEVER USE A FLAME.

Vent And Combustion Air Hoods

The vent hood and combustion air hood (with screens) are

shipped attached to the blower housing in the blower

compartment. These hoods must be installed to assure proper

unit function. All hoods must be fastened to the outside of the

gas heat access panel with the screws provided in the bag also

attached to the blower housing.

The screen for the combustion air intake hood is secured to the

inside of the access panel opening with three fasteners and the

screws used for mounting the hood to the panel. The top flange of

this hood slips in under the top of the access panel opening when

installing. Refer to Vent and Combustion Air Hood Figure 16.

The vent hood is installed by inserting the top flange of the hood

into the slotted opening in the access panel and securing in place.

The products of combustion are discharged horizontally through

this screened, hooded vent opening on the gas heat access panel.

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warning exactly could result

in serious injury, death or property damage.

Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically

for the detection of leaks to check all connections. A fire

or explosion may result causing property damage,

personal injury or loss of life.

The furnace and its individual shut-off valve must be

disconnected from the gas supply piping system during

any pressure testing at pressures in excess of 1/2 PSIG.

Pressures greater than 1/2 PSIG will cause gas valve

damage resulting in a hazardous condition. If it is

subjected to a pressure greater than 1/2 PSIG, the gas

valve must be replaced.

The furnace must be isolated from the gas supply piping

system by closing its individual manual shut-off valve

during any pressure testing of the gas supply piping

system at test pressures equal to or less than 1/2 PSIG.

Threaded joints should be coated with a sealing

compound that is resistant to the action of liquefied

petroleum gases. Do not use Teflon tape.

LP gas is an excellent solvent and will quickly dissolve

white lead and most standard commercial compounds. A

special pipe dope must be used when assembling

wrought iron or steel pipe for LP. Shellac base compounds

such as Gaskolac or Stalastic, and compounds such as

Rectorseal #5, Clyde’s, or John Crane may be used.

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warning exactly could result

in serious injury, death or property damage.

Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically

for the detection of leaks to check all connections. A fire

or explosion may result causing property damage,

personal injury or loss of life.

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York W)036 THRU 060 Specifications Page 32

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