Pioneer PHR100-55, Instruction Manual

Page: 18 / 65

18
PART 6 – HEATER PIPING
Plumbing of this heater should only be done by a qualified, licensed plumber in accordance with all local
plumbing codes. The heater may be connected to an indirect storage tank to supply domestic hot water.
HTP offers 30/45/60/80/119 gallon size indirect storage tanks in Stainless Steel or 50/80/119 in Glass
Lined construction. These indirect storage tanks will be directly connected to the supply and return
connection.
A. GENERAL PIPING INFORMATION
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 heater. Some codes/jurisdictions may require additional external controls.
B. RELIEF VALVE
Install supplied pressure and temperature relief valve. Connect discharge piping to a safe disposal
location, following the guidelines below. Replacement is available. See parts list.
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 floor
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 shutoff 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 filling and pressurizing the system by lifting the lever.
Make sure the valve discharges freely. If the valve fails to operate correctly, replace with a new
properly rated relief valve.
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.
Never use dielectric unions for galvanized steel fittings when connecting to a stainless steel storage tank
or heater.