Installation
34 RT-SVX35H-EN
Gas Heat Units (WFHE)
All internal gas piping is factory-installed and pressure/
leak-tested before shipment. Once the unit is set into
place, the gas supply line must be field-connected to the
elbow located inside the gas heat control compartment.
Access holes are provided on the unit as shown in
Figure 4, p. 19 - Figure 8, p. 23 to accommodate a side or
bottom pipe entry on W_HE Casings
2 through 9.
F
ollowing the guidelines listed below will enhance both
the installation and operation of the furnace.
Note: In the absence of local codes, the installation must
conform with the American National Standard
Z223.1a of the National Fuel Gas Code, (latest
edition).
1. To assure sufficient gas pressure at the unit, use
Table 6, p. 35 as a guide to determine the appropriate
gas pipe size for the
unit heating capacity listed on the
u
nit's nameplate.
2. If a gas line already exist, verify that it is sized large
enough to handle the additional furnace capacity
before connecting to it.
3. Take all branch piping from any main gas line from the
top at 90° degrees or at 45° degrees to prevent
moisture from being drawn in with the gas.
4. Ensure that all piping connections are adequately
coated with joint sealant and properly tightened. Use a
pipi
ng compound that is resistant to liquid petroleum
g
ases.
5. Provide a drip leg near the unit.
6. Install a pressure regulator at the unit that is adequate
to maintain 7" w.c. for natural gas while the furnace is
operating at full capacity.
Figure 15. Outside air sensor & tubing
WARNING
Flammable Vapors!
When connecting to existing gas lines be sure to shut
off the gas supply ahead of connection point. To avoid
explosion or possible fire, always purge all residual gas
from piping before cutting into existing line or
removing threaded fittings. Failure to shut off the gas
supply and remove all gas vapors could result in death
or serious injury.
WARNING
Hazardous Gases and Flammable Vapors!
Exposure to hazardous gases from fuel substances
have been shown to cause cancer, birth defects or other
reproductive harm. Improper installation, adjustment,
alteration, service or use of this product could cause
flammable mixtures or lead to excessive carbon
monoxide. To avoid hazardous gases and flammable
vapors follow proper installation and set up o
f this
p
roduct and all warnings as provided in this manual.
Failure to follow all instructions could result in death or
serious injury.
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