HTP phoenix plus PHP260-119 - Part 4 - Piping; Heater Plumbing; Auxiliary Connection; Backflow Preventer

LP-454 Rev. 004 Rel. 002 Date 12.1.17
13
Part 4 - Piping
Failure to follow the instructions in this section WILL VOID the
warranty and may result in property damage, severe personal
injury, or death.
Dielectric unions or galvanized steel ttings must not be used in
a system with this water heater. Doing so WILL VOID the warranty.
Use only copper, brass, or stainless steel ttings. Teon thread
sealant must be used on all connections.
DO NOT pipe this water heater with black iron, galvanized steel,
steel, or lead pipe. Doing so will result in premature product failure
and property damage, and WILL VOID the warranty.
A. Heater Plumbing
Use two wrenches when tightening water piping at heater. Use
one wrench to prevent the heater return or supply line from
turning. Failure to prevent piping connections from turning could
cause damage to heater components.
The heater control module uses temperature sensors to provide
both high limit protection and modulating temperature control.
The control module also provides low water protection by sensing
the water level in the tank. Some codes / jurisdictions may require
additional external controls.
The domestic water connections must be installed in accordance to
all local and national plumbing codes, or any applicable standard
which prevails. The inlet (cold) and outlet (hot) ports are 1 1/2” on
all models.
The water heaters are shipped with a brass drain valve located on
the inside of the cabinet. The water heater is also equipped with a
1” auxiliary port that can be used as a recirculation line. The auxiliary
port is located between the upper and lower combustion systems.
When used, the recirculation line will increase overall heater
eciency.
If there is a backow preventer or any type of a no return valve in the
system, install an additional tee on the cold feed line to connect to a
potable hot water expansion tank.
In the hot outlet, install a suitable adapter to match the copper
tubing of the plumbing system. A thermal trap or heat trap loop may
be installed here to provide additional energy savings and prevent
the thermal siphoning of domestic hot water.
B. Auxiliary Connection
The auxiliary connection is provided to improve eciency via
recirculation. This connection must be installed in accordance with
all local and national codes or any applicable standard that prevails.
Auxiliary connection is 1” on all models. Never use dielectric unions
or galvanized steel ttings. Use only copper or brass ttings. Sealant
must be used on all connections.
Never connect auxiliary connections to any system that uses glycol
or other solutions formulated for hydronic systems. These auxiliary
connections are to be used only in a potable water system. Failure
to follow this warning could result in serious injury or death.
C. Backow Preventer
Use a backow preventer specically designed for water heater
installations. This valve should be installed on the cold water ll supply
line per local codes.
D. Potable Expansion Tank
A potable hot water expansion tank is required to oset heated water
expansion. In most city plumbing systems, the water meter has a
no return or back ow device built into the system to prevent back
owing of water into city mains. Some local codes require back ow
preventers on all incoming water supplies. The hot water expansion
tank must be listed for potable water use. The expansion tank should
be located on the cold inlet piping close to the water heater.
Expansion Tank and Make-Up Water
1. Ensure that the expansion tank is sized to correctly handle heater
and system water volume and temperature.
Undersized expansion tanks cause system water to be lost from the
relief valve, causing make-up water to be added. Eventual heater
failure can result due to excessive make-up water addition. SUCH
FAILURE IS NOT COVERED BY WARRANTY.
The expansion tank must be suitable for hot potable water systems.
2. The expansion tank must be located as shown in Applications, this
manual, or following recognized design methods. See expansion tank
manufacturer’s instructions for details.
E. Temperature and Pressure Relief Valve
To avoid water damage or scalding due to relief valve operation:
• Discharge line must be connected to relief valve outlet and
run to a safe place of disposal. Terminate the discharge line
in a manner that will prevent possibility of severe burns or
property damage should the relief valve discharge.
• Discharge line must be as short as possible and the same
size as the valve discharge connection throughout its entire
length.
• Discharge line must pitch downward from the valve and
terminate at least 6” above the oor drain, making discharge
clearly visible.
• The discharge line shall terminate plain, not threaded, with
a material serviceable for temperatures of 375
o
F or greater.
• Do not pipe discharge to any location where freezing could
occur.
• No valve may be installed between the relief valve and heater
or in the discharge line. Do not plug or place any obstruction
in the discharge line.
• Test the operation of the relief valve after lling and
pressurizing the system by lifting the lever. Make sure the
valve discharges freely. If the valve fails to operate correctly,
immediately replace with a new properly rated relief valve.
• Test T&P valve at least once annually to ensure the waterway
is clear. If valve does not operate, turn the heater “o” and call
a plumber immediately.
• Take care whenever operating relief valve to avoid scalding
injury or property damage.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD RESULT
IN FAILURE OF RELIEF VALVE OPERATION, RESULTING IN POSSIBILITY
OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY,
OR DEATH.
Overheated water and high pressures can cause water tank
explosion. A properly sized temperature and pressure relief valve
must be installed in the opening provided on the water heater.
Failure to install a properly sized temperature and pressure relief
valve could result in explosion and property damage, serious injury,
or death.
Pump motors should not be supported by any type of stand due
to possible misalignment of pump and motor. Failure to follow
this instruction may result in property damage or personal injury.