Hubbell ST, Operating And Maintenance Manual

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equipment of materials, as meeting the requirements for Relief Valves and Automatic
Gas Shutoff for Hot Water Supply Systems. ANSI Z21.22-1971. THE CUSTOMER
IS RESPONSIBLE TO PROTECT PROPERTY AND PERSONNEL FROM HARM
WHEN THE VALVE FUNCTIONS.
All water heaters have a risk of leakage at some unpredictable time. IT IS THE
CUSTOMER'S RESPONSIBILITY TO PROVIDE A CATCH PAN OR OTHER
ADEQUATE MEANS, SO THAT THE RESULTANT FLOW OF WATER WILL
NOT DAMAGE PROPERTY.
If unit is painted or insulated on the job site, care should be taken not to paint or
insulate over the A.S.M.E. nameplate. This plate should be accessible and legible at
all times to inspectors, and information from this plate must be used when ordering
parts from the factory.
The tank should be fully drained in the event the steam has been turned off and if there is
danger of freezing. If tank is drained and to be left empty for more than 8 hours, at least
2-inches of water should be left in the bottom of cement lined tanks to prevent lining
from drying and cracking.
WATER HEATER PLACEMENT
1. Adequate space should be provided for removal of heating element.
2. Unit should be level to permit proper drainage
PIPING INSTALLATION
NOTE:
The most effective means for preventing deterioration from accelerated
corrosion due to galvanic and stray current is the installation of dielectric
fittings/unions. The installation of these fittings is the responsibility of the installing
contractor.
1. All integral components have been properly sized to meet design conditions.
Piping to the unit should be sized to meet the design conditions, as dictated by
good engineering practices.
2. Refer to the enclosed drawing for location of piping connection.
3. Install the combination temperature and pressure safety relief valve in the tapping
provided. Note that this is required by law for safety considerations.
Outlet to floor drain
Install into provided tapping
Manual Release
Lever
Temperature Probe
4. Install a relief valve overflow pipe to a nearby floor drain. CAUTION: No valve
of any type should be installed between the relief valve and tank or in the drain
line.
HOOK-UP OF AIR AND WATER OPERATED CONTROLS
1. Most air or water operated valves on Hubbell water heaters are controlled by
Powers Accritem. Occasionally, a Robertshaw Fultrol is furnished which
operates identically to the Powers control except supply and output connections
are reversed in location. Controls are normally mounted on the back side of the
tank shell.
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