Installation guide

INSTALLATIONSECTION 3
This water heater can deliver scalding temperature water at any outlet in the system.
Be careful whenever using hot water to avoid scalding injury. To protect against injury, you
should install approved mixing valves in the water system. This valve will reduce point of
discharge temperature by mixing cold and hot water in branch supply lines. Such valves
are available from your local plumbing supplier.
SCALDING
The following chart details the relationship of water temperature and time with regard to
scald injury and may be used as a guide in determining the safest water temperature for
your applications.
APPROXIMATE
TIME/TEMPERATURE
SCALD CHART
APPROXIMATE TIME/TEMPERATURE
RELATIONSHIPS IN SCALDS
48.8ºC More than 5 minutes
51.6ºC 1
1
⁄2 to 2 minutes
54.4ºC About 30 seconds
57.2ºC About 10 seconds
60.0ºC Less than 5 seconds
62.8ºC Less than 3 seconds
65.6ºC About 1
1
⁄2 seconds
68.4ºC About 1 second
The water heater and individual shutoff valve must be disconnected from the gas supply piping system during any
pressure testing of the system at test pressures in excess of 35mbar/14.0 in wg. The water heater must be isolated
from the gas supply piping system by closing its manual shutoff valve during any pressure testing of the gas supply
system at test pressures equal to or less than 35mbar/14.0 in wg. The supply line must be capped when not
connected to the water heater.
CAUTION
Be sure that the gas meter has sufficient capacity to supply the full rated gas input of the
water heater as well as the requirements of all other gas fired equipment supplied by the
meter. If the gas meter is too small, ask the gas company to install a larger meter having
adequate capacity.
GAS METER SIZE
NATURAL GAS
ONLY
Main line gas pressure to the water heater should be maximum 35mbar/14.0 in wg.
The inlet gas pressure must not exceed the maximum value. In some installations, a
regulator sized for the input rating of the water heater will need to be installed just ahead of
the inlet gas connection to the water heater to reduce excess gas pressure or surges in
gas pressure.
GAS PRESSURE
REGULATION
14