INSTALLATION AND OPERATION INSTRUCTIONS
8
BT INDIRECT SERIES – WATER HEATERS
2.6 Temperature and Pressure Relief Valve
1.
Supply a Temperature and Pressure Relief Valve rated to ANSI Z21.22 and
that has a rating greater than the gross input of the boiler connected to the
water heater.
2.
Install the Temperature and Pressure Relief Valve in the tapping located at
the top of the tank and labeled Relief Valve.
3.
Pipe the outlet of the relief valve to an appropriate location (Floor Drain or
Drain Pan) terminating within 6" of an appropriate drain location. Pipe the
relief valve piping down toward the outlet of the piping so that the piping and
the valve can fully drain. Never terminate the relief valve piping outdoors
where it may freeze.
4.
Do NOT install a shut off valve between the water tank and the relief valve.
Do NOT plug the outlet of the relief valve.
2.7 Additional Recommended Components
1.
Shut-off valves. Allows the isolation of the water heater from the boiler
system during service.
2.
Tank drain valve. Installed at the bottom of the water heater to allow for
servicing and draining of the water heater.
3.
Unions. Allows for easy locating or removal.
4.
Vacuum breaker. Protects the water heater from collapse if a hot tank is
valved off to service other components in the system.
5.
Thermal expansion tank. If the water heater is installed in a closed water
supply system, such as a system having a back flow preventer in the cold
water supply line, the installation of a thermal expansion tank is required.
6.
Refer to Figure 6
in this manual for suggested external components.
2.8 Removing the Existing Domestic Water Heating
System
If the IBC water heater is being installed in an older hydronic system that does
not use an IBC boiler:
•
External Tankless Heater
. Disconnect all lines to the boiler and plug the
boiler fittings. Disconnect the external heater from the boiler piping, and the
domestic piping systems.
•
Internal Tankless Heaters
. Disconnect the domestic piping. Do not plug
the cold water or the hot water fittings in the internal tankless coil. Leave the
coil in the boiler with the cold and hot water fittings open to prevent pressure
build-up in the coil.
If the IBC water heater is being installed to replace an electric or direct fired gas or
oil water heater: Disconnect the water piping and either strip back to the nearest
main line and cap off, or re-use for the new tank, whichever is appropriate.
•
Electric Water Heater
. Disconnect the electrical supply wiring and remove
back to the breaker panel or terminate in an approved junction box. Work
must conform to all applicable electrical codes.
•
Direct Fired Gas Water Heater
. Disconnect the gas supply line to the
heater, strip back to the nearest mains piping and cap off. Remove vent
connector back to the common venting system and seal off or abandon as
applicable. Work must conform to all applicable codes.
CAUTION
Do not operate the IBC water
heaters in areas where the
pH is above 8.0 or below
6.0, and/or with chloride
concentrations greater than
80 parts per million (ppm).
IBC’s standard warranty does
not cover problems caused
by improper water pH or
excessive levels of chlorides.
WARNING
There are a number of
conditions, including
improper control settings,
which could result in elevated
tank temperatures from
ANY type of water heater.
An overheating hazard can
result, potentially causing
serious personal injury and/or
property damage.
IBC recommends as a
minimum precaution, the
installation of a point of
source ASSE 1017 approved
thermostatic mixing valve on
the outlet of the water heater.
Local jurisdictions may
require more comprehensive
protective measures
depending on the place of
installation (ie. schools,
nursing homes, etc.). Check
with local Authorities for
direction.
CAUTION
When removing any fuel
burning appliance from a
common venting system, the
opening must be properly
sealed off and; if there are
remaining appliances still
using the common venting
system, the vent must be
examined to ensure that it is
not over-sized as a result of
having removed the old water
heater.
