39
CHAPTER 7
DHW Demand
DHW
186°F
156°F
Target = 186°F
Gas Flow
External Manual
Gas Shut O
Valve (Must Be
Within 6” of the
Boiler )
Sediment Trap
Min. Length of 3"
Tee Fitting
Cap
Union Fitting
CHAPTER 7 - GAS PIPING
7.1. Gas Supply Piping Connection
The gas supply piping must be installed in ac-
cordance to all applicable local, state, national
codes, and utility requirements.
1. Install a 3/4” NPT for EXALT pipe union at the gas
nipple, for ease of service.
2. I
nstall a manual shuto valve in the gas supply piping as
shown in Fig. 25 above. For installations in Canada, the
installer must tag and identify the main shuto valve.
3. Install a sediment trap (drip leg) on the gas supply
line prior to connecting to the EXALT gas train as
shown in Fig. 25 above.
4. Support the gas piping using hangers. Do not
support the piping by the unit or its components.
5. Purge all air from the gas supply piping.
6. Before placing the EXALT into operation, check and
test all connections for leaks.
• Close the manual shuto valve during any
pressure test with less than 13”w.c.
• Disconnect the EXALT and its gas valve from
the gas supply piping during any pressure test
greater than 13”w.c.
NOTICE
Fig. 25 - Recommended Gas Supply Piping
Do not check for gas leaks with an open flame. Use
a gas detection device or bubble test. Failure to
check for gas leaks can cause substantial property
damage, serious injury, or death.
7. Use pipe dope compatible with natural and
propane gases. Apply sparingly only to the male
threads of pipe joints so that pipe dope does not
block gas ow.
• Failure to apply pipe dope as detailed above
can result in substantial property damage,
serious injury, or death.
• Use a two-wrench method when tightening
field piping onto the boiler piping connections.
Use one wrench to prevent the boiler
connections from turning and the second
to tighten field piping. Failure to support
the boiler piping connections could damage
piping, causing a leak, resulting in substantial
property damage, serious injury, or death.
WARNING
WARNING
To Next Page
Loading...
Need help?
General