Use and Care Manual

9
WHL-007 Rev. 10.3.14
When filling the water heater, open a hot water tap to release air in the tank and piping. Failure to do so could lead to improper water
heater operation.
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 product warranty.
B. BOILER CONNECTIONS
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.
Use a 1” nominal minimum pipe size when piping with zone valves or circulators.
On the water heater, the boiler supply connects to the outlet of the circulator. The circulator inlet is to be connected to the hot outlet side
of the boiler. Be sure that the arrow on the circulator is facing the correct flow direction. (See pressure drop sizing for circulator, this
manual.) On the tank, the boiler return is to be connected to the return side of the boiler. The return(s) from heating loop(s) should have
a flow check or swing check valve installed before the return pipe from the tank.
In a steam boiler, the tank supply must be connected to the boiler well below the minimum water level. A strainer and drain valve should
be installed at the boiler for periodic draining of scale and sludge. Banging and steam bound traps will occur if the boiler water supplied
to the heat exchanger has steam or is slightly above the low water cut off.
Never use dielectric fittings or galvanized steel fittings on any domestic water connections. Use only copper or brass fittings. Failure to
follow this caution will result in premature heater failure. Such failure is NOT covered by warranty.
C. DOMESTIC PIPING INLET
Use both thread tape and pipe dope to connect to the all stainless steel ¾” domestic inlet and outlet. A shut off valve between the city
water supply and tank inlet is recommended for ease of service.
It may be recommended to use a back flow preventer – check local codes. If a back flow preventer or a no return valve is used, a
thermal expansion tank must be installed on the cold water supply between the tank and valve. If the tank is replacing a tankless coil in
the boiler, disconnect coil plumbing and use the cold inlet pipe and hot water outlet pipes for the water heater.
D. AUXILIARY CONNECTIONS
The auxiliary connections are additional connections for a recirculation line. These connections must be installed in accordance with all
local and national codes or any applicable standard that prevails. Auxiliary connections are ¾” 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.
E. FILLING THE HEATER
When filling the water heater, open a hot water tap to release air in the tank and piping. The tank to ensure proper water heater
operation. Failure to ensure the water heater is full before turning it on will result in damage to the water heater, and could result in
property damage. Such damages ARE NOT covered by water heater warranty.
 Make certain that the field installed drain valve is completely closed.
 Open the shut-off valve in the cold water supply line.
 Open the hot water faucets to allow air to vent from the heater and piping.
 Allow sufficient time for the heater to completely fill with water.
F. TEMPERATURE AND PRESSURE RELIEF VALVE
On all models, an appropriate T&P valve must be supplied and installed as described in Figure 4.