Gas Supply And Piping; Leak Check; High Altitude Derate - Nordyne M3RL 060A AW Installation Instructions Manual

household detergents, etc.,bufferitsacidity.If
thedrainis notactively usedorifcodesrequire,
obtaina neutralizer k it(SeeTable10,page28).
Proper d rainsandconnections t othe conden-
satetubingarerequired as NORDYNE cannot
beheldresponsible for water leakagewhich
occursdueto loosehoseconnections o r
improperly s ealeddrainline pipes.
GAS SUPPLY AND PIPING
General
This furnace is equipped for bottom, left, or
right side gas entry. Typical gas service hook-
ups are shown in Figure 22. When making the
gas connection provide clearance between the
gas supply line and the entry hole in the furnace
casing to avoid unwanted noise and/or damage
to the furnace.
All gas piping must be installed in compliance
with local codes and utility regulations. Some
local regulations require the installation of a manual
main shut=offvalve and ground joint union exter-
nal to the furnace. The shut-off valve should be
readily accessible for service and/or emer-
gency use. Consult the local utility or gas
supplier for additional requirements regarding
placement of the manual main gas shut-off. In
the absence of local codes, the gas line instal-
lation must comply with the provisions stated in
the Federal Manufactured Home Standard
(H.U.D Title 24, part 280) and the National Fuel
Gas Code (ANSI Z223.1/NFPA-54) or (CAN/
CGA B149) installation codes.
A drip leg should be installed in the vertical pipe
run to the unit. Table 11 (page 34) lists gas
flow capacities for standard pipe sizes as a
function of length in typical applications based
on nominal pressure drop in the line.
NOTE: Gas piping must not be run in or through
air ducts, gas vents, etc.
Compounds used on threaded joints of gas
piping must be resistant to the actions of lique-
fied petroleum gases.
CAUTION:
Do not use matches, lighters, candies,
or other sources of open flame to check
for gas leaks.
NOTE: When pressure testing gas supply
lines at pressures greater than 1/2 psig (14 in.
water column), the furnace must be discon-
nected from the gas supply piping system to
prevent damage to the gas control valve.
If the test pressure is less than or equal to 1/2
psig (14 in. water column), the furnace must be
isolated from the gas supply line by closing the
manual shut-off valve.
Main
Control
Board
Burner
Box
Gas
Floor "J
To Gas
Supply
AIt. Gas
Line Entry
Figure 22. Typical Gas Piping
Leak Check
After the gas piping to the furnace is complete,
all connections must be tested for gas leaks. To
check for leaks use only a soap and water solu-
tion or other approved method.
High Altitude Derate
The nameplate input rating for the furnaces
apply for elevations up to 4,000 feet above sea
level for US and Canada. If the elevation for the
furnace location is higher than 4,000 feet above
sea level, the furnace input must be derated by
using the appropriate orifice size listed in
Table 12, page 34.
21