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Installation instructions
33
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
Louvers, grills and screens have a blocking effect, when used,
increase the sizes of your openings by 300% for wood louvers
(as wood type will reduce the free air by 75%) and 43% for
metal louvers (as metal will reduce the free air by 30%). Refer
to the National Fuel Gas Code for complete information.
4.7 Factory settings
The appliances are supplied having been set in the factory for
the values shown on the rating plate for natural gas.
For any other adjustments see chapter 6.8.
4.7.1 Natural gas
The appliances must not be operated if the dynamic gas
pressure is less than 3.5" WC
1)
or greater than 10.5" WC.
4.7.2 Liquid propane gas (after gas conversion)
The appliances must not be operated if the dynamic gas
pressure is less than 8" WC or greater than 13" WC.
If gas conversion is needed (Natural Gas to Liquid propane
gas), see section 6.8.
WARNING:
▶ The gas type conversion must only be carried out by a
qualified contractor.
4.8 Gas piping & connections
Before connecting the gas supply, be sure that the heater is set
for the same gas to which it will be connected.
In the United States: The installation must conform with local
codes or, in the absence of local codes, the National Fuel Gas
Code ANSI Z223.1/NFPA 54.
In Canada: The Installation must conform to CGA B149
INSTALLATION CODES and/or local installation codes.
DANGER:
Explosion hazard!
▶ DO NOT connect to an unregulated or high pressure
propane line or to a high pressure commercial natural gas
line.
DANGER:
Explosion hazard!
▶ The heater must be isolated from the gas supply piping
system during any pressure testing of that system at test
pressures equal to or more than 0.5 psig. If overpressure
has occurred, such as through improper testing of the gas
lines or malfunction of the supply system, the gas valve
must be checked for safe operation.
GAS CONNECTIONS
▶ Install a manual gas shut off valve on the gas supply line
within easy reach of the appliance.
▶ Install a union when connecting the gas supply.
▶ Gas connection to the water heater is ¾" NPT. See
chapter 4.8.1 for the minimum internal pipe diameter
required.
▶ Undersized flexible appliance connector is not permitted.
▶ National Fuel Gas Code requires that a sediment trap (drip
leg) be installed on gas appliances not so equipped. The
drip leg must be accessible and not subject to freezing
conditions. Install in accordance with the
recommendations of the serving gas supplier, see fig. 25.
▶ Tighten gas pipe with the support of a wrench, see fig. 24.
Fig. 24 Tighten gas pipe to the heater
1) To assure maximum heat input at maximum vent length
minimum gas pressure should be 5" W.C. for the 199 kBTU
models and 4" W.C. for the 160 kBTU models. For more
information see section 4.6.3.
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