Caution – Schwank STSp-WP User Manual
Page 21
SP-MSWP-BX-09A
STSp-WP Manual
RD: MAY 2004
RL: 9
KH
Page 17
For ease of installation, this heater has been
provided with a fresh air intake duct hood. It
is used as an outdoor intake hood to bring
combustion air to the heater from outside.
Do not use flexible dryer hose for air inlet
duct. The corrugated sides of this tubing add
too much restriction to the air flow and will
result in heater shut down by air switches.
The Air Intake inlet shall not be located less than the following distances:
•
Three feet above grade level
•
Twelve inches from flue vent terminal of
any heaters with input up to 100,000 Btus
•
Three feet from flue vent terminal of any
heaters over 100,000 BTU
PLEASE SEE SECTION 14: HEATER EXPANSION (PAGE 19).
In installations where chlorinated hydrocarbons are in use,
such as Trichloroethylene or Chloroethylene Nu, it is essential
that combustion air be brought in from non-contaminated
areas. Burning the fumes from these gases will create
Hydrochloric Acid fumes, which are detrimental to humans,
equipment and buildings.
13. GAS SUPPLY INSTALLATION
The approved flexible gas connector
supplied by Schwank must be installed
between the heater and gas piping as illus-
trated by FIGURE 18 Page 19.
The heater must be isolated from the gas
supply piping system by closing its individual
manual shutoff valve, supplied by installer,
during any pressure testing of the gas supply
piping system.
CAUTION:
If drawing in fresh air from outside, it is
recommended as per common Engineering
practice, that the combustion air intake duct
be insulated.