HTP 140M, Руководство по установке

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LP-185 Rev. 9.9.14
B. RELIEF VALVE
The relief valve must comply with the standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems
(ANSI Z21.22) and/or the standard Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves,
CAN1-4.4 , as well as all local codes. In addition, the relief valve must be rated to the maximum BTU/hr rating of the boiler.
The
American National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) do not require a combination temperature and
pressure relief valve for this boiler. However, a combination temperature and pressure relief valve may be required by local codes.
Connect discharge piping to safe disposal location. See the following guidelines.
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 valv
e 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 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, immediately replace with a new properly rated 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.
Hot water outlet pipes can be hot to touch. Insulation must be used for hot water pipes below 36” to protect children against injuries due
to scalds.
NOTE: If a relief valve discharges periodically, this may
be due to thermal expansion in a closed water supply
system.
DO NOT PLUG THE RELIEF VALVE. An
expansion tank may be required.
C. SEPARATE LOW WATER CUTOFF
A low water cutoff may be required by state and local codes, or by some insurance companies. A low water cutoff is also required if the
boiler is installed above the piping level. Check code requirements before installing the boiler.
If required:

Use an electrode probe type low water cutoff designed for hydronic installations.
APPROXIMATE TIME / TEMPERATURE RELATIONSHIPS IN SCALDS
120
o
F More than 5 minutes
125
o
F 1 ½ to 2 minutes
130
o
F About 30 seconds
135
o
F About 10 seconds
140
o
F Less than 5 seconds
145
o
F Less than 3 seconds
150
o
F About 1 ½ seconds
155
o
F About 1 second
Table 3