lp-441 Rev. 004 Rel. 000 Date 7.2.21
14
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.
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.
Do not apply a torch within 12” of the water heater. If sweat
connections are used, sweat tubing to the adapter before fitting
adapter to the water connections on the heater. Damages due to
improper installation practices ARE NOT covered by warranty.
Dielectric unions or galvanized steel fittings must not be used in a
system with this water heater. Doing so WILL VOID the warranty. Use
only copper, brass, or stainless steel fittings. Teflon thread sealant
must be used on all connections.
Plumbing of this appliance should only be done by a qualified, licensed
plumber in accordance with all local plumbing codes.
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. Some
codes / jurisdictions may require additional external controls.
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.
A. General Plumbing Information
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 3/4” on all models.
•
Pipe material must be suitable to meet local codes and industry
standards.
•
The pipe must be cleaned and without blemish before any
connections are made.
•
All water piping should be insulated.
It is recommended to install a sweat shut-off valve and a union in the
cold inlet piping and hot outlet to ease future servicing. If there is a
backflow preventer or any type of a no return valve in the system, install
an additional tee here, suitable for 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 Connections
The auxiliary connections are additional connections for a recirculation
connection, air handlers, plate exchangers, or other devices that
supply hot water. These connections must be installed in accordance
with all local and national codes or any applicable standard that
prevails. Auxiliary connections are 3/4” on all models. Never use
dielectric unions or galvanized steel fittings. Use only copper or brass
fittings. 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.
D. Potable Expansion Tank
A potable hot water expansion tank is required to offset heated
water expansion. In most city plumbing systems, the water meter
has a no return or back flow device built into the system to prevent
back flowing of water into city mains. Some local codes require
back flow 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.
Expansion tanks must be sized according to total system volume.
This includes all length of pipe, all fixtures, heaters, etc. Failure to
properly size for system expansion could result in wasted time,
money, possible property damage, serious personal injury, or death.
WARNING
!
C. Backflow Preventer
Use a backflow preventer specifically designed for water heater
installations. This valve should be installed on the cold water fill
supply line per local codes.
E. Temperature and Pressure Relief Valve
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.
Do not thread a cap or plug into the relief valve or relief valve
line under any circumstances! Explosion and property damage,
serious injury, or death may result.