Install Instructions

12
Your local code authority may have other specic relief valve
requirements not covered in this section.
THE PURPOSE OF A RELIEF VALVE IS TO AVOID EXCESSIVE
PRESSURE OR TEMPERATURE INTO THE STEAM RANGE,
WHICH MAY CAUSE SCALDING AT FIXTURES, TANK
EXPLOSION, SYSTEM OR HEATER DAMAGE.
TO AVOID SCALDING OR WATER DAMAGE, A DRAIN LINE
MUST BE CONNECTED TO A RELIEF VALVE TO DIRECT
DISCHARGE TO A SAFE LOCATION. A DRAIN LINE MUST
NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET
AND IT MUST NOT CONTAIN ANY VALVES BETWEEN THE
HEATER AND THE RELIEF VALVE OR THE RELIEF VALVE AND
THE DRAIN LINE EXIT. IN ADDITION, THERE SHOULD NOT
BE ANY RESTRICTIONS IN A DRAIN LINE NOR SHOULD IT BE
ROUTED THROUGH AREAS WHERE FREEZING CONDITIONS
MIGHT OCCUR. DO NOT THREAD OR CAP THE DRAIN LINE
EXIT. RESTRICTING OR BLOCKING A DRAIN LINE WILL
DEFEAT THE PURPOSE OF THE RELIEF VALVE AND MAY
CREATE AN UNSAFE CONDITION. INSTALL A DRAIN LINE
WITH A DOWNWARD SLOPE SUCH THAT IT NATURALLY
DRAINS ITSELF.
Recommended locations of relief valves are shown in the
installation diagrams.
HARD WATER
Where hard water conditions exist, water softening or the threshold
type of water treatment is recommended. This will protect the
dishwashers, coffee urns, water heaters, water piping and other
equipment. When water softening or water treatment is not
practical, a comparatively easy method of periodic lime removal
from the heater may be employed by installing gate valves,
drain valve and acid ll opening as shown in PREVENTIVE
MAINTENANCE section of this manual.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements or such
conditions as high line pressure, among others, have installed
devices such as pressure reducing valves, check valves, and back
ow preventers. Devices such as these cause the water system
to be a closed system.
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed
system the volume of water will grow when it is heated. As the
volume of water grows there will be a corresponding increase in
water pressure due to thermal expansion. Thermal expansion can
cause premature tank failure (leakage). This type of failure is not
covered under the limited warranty. Thermal expansion can also
cause intermittent Temperature-Pressure Relief Valve operation:
water discharged from the valve due to excessive pressure build
up. This condition is not covered under the limited warranty. The
Temperature-Pressure Relief Valve is not intended for the constant
relief of thermal expansion. A properly sized thermal expansion
tank must be installed on all closed systems to control the harmful
effects of thermal expansion. Contact a local plumbing service
agency to have a thermal expansion tank installed.
WATER LINE CONNECTIONS
This manual provides detailed installation diagrams for typical
methods of application. See piping diagrams.
• Cer-Temp 80 Recovery System (for one temperature water).
These diagrams will serve to provide the installer with a reference
for the materials and method of piping necessary for installation.
It is essential that all water and gas piping, vent connections,
electrical wiring and check and ow regulating valves be installed
as shown on the diagrams.
Consult the installation diagrams for appropriate locations to install
the safety ow switch(es), drain valves, thermometers, relief valves
and the circulating pump(s). Apply suitable pipe thread sealing
compounds to only the male threads of parts to be connected.
If any of these parts are being replaced in a functioning system,
remember to shut off the manual gas and control valve(s) and close
off the water inlet(s). Open a nearby faucet to relieve pressure
and drain the heater and/or system before attempting to install
the new parts.
Check the diagrams thoroughly before starting installation to avoid
errors and minimize time and material costs.
If the system is to be lled with water for testing or other purposes
during cold weather and before actual operation, care must be
taken to prevent a downdraft entering the heater or freezing air
from contacting the system. Failure to do so may cause the water in
the system to freeze with resulting damage to the system. Damage
due to freezing is not covered by the warranty.
WATER (POTABLE) HEATING AND SPACE HEATING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
2. Toxic chemicals, such as those used for boiler treatment, shall
never be introduced into this system.
3. This unit may never be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please refer
to installation diagrams on pages 13-15 of this manual for
suggested piping arrangements.
5. These water heaters cannot be used in space heating
applications only.