HTP EFT-399 - Manual (Page 19)

19
LP-387 REV. 6.10.14
Plumbing of this product should only be done by a qualified, licensed plumber in accordance with all local plumbing codes. The boiler
may be connected to a storage tank to supply domestic hot water. HTP offers 60/80/119/175 gallon size storage tanks in either
stainless steel or glass-lined construction. These storage tanks can be directly connected to the boiler supply and return connection.
A. GENERAL PIPING INFORMATION
The building piping system must meet or exceed the piping requirements in this manual.
Use two wrenches when tightening water piping at the boiler. Use one wrench to prevent the boiler return or supply line from turning.
Failure to prevent piping connections from turning could cause damage to boiler components.
The control module uses temperature sensors to provide both high limit protection and modulating temperature control. The control
module may also provide low water protection (through the addition of an optional kit) by sensing the water level in the heat exchanger.
An optional flow switch may be installed on the supply of the system to activate the boiler when there is enough flow. Some
codes/jurisdictions may require additional external controls.
NOTE: The addition of a high temperature limiting device is important if the boiler is to be connected to a domestic hot water system.
B. 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.

D ischarge line must pitch downward from the valve and terminate at least 6” above the floor drain, making discharge clearly
visible.

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 boiler 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 it with a new relief valve.

Test relief valve at least once annually to ensure the waterway is clear. If valve does not operate, turn the boiler “off” and call
a plumber immediately.

Take care whenever operating relief valve to avoid scalding injury or property damage.

For boilers installed with only a pressure relief valve, the separate storage vessel must have a temperature and pressure relief
valve installed. This relief valve shall comply with Relief Valves for Hot Water Supply Systems, ANSI Z21.22 CSA4.4.
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 or galvanized steel fittings when connecting to a stainless steel storage tank or boiler. Failure to follow this
instruction can lead to premature failure of the boiler system. Such failures ARE NOT covered by warranty.
The National Standard Plumbing Code, the National Plumbing Code of Canada, and the Uniform Plumbing Code limit the pressure of
the heat transfer fluid to less than the minimum working pressure of the potable water system up to 30 psi maximum. The heat transfer
fluid must be water or other non-toxic fluid having a toxicity of Class 1, as listed in Clinical Toxicology of Commercial Products, 5
th
Edition.