Hubbell Electric Heater Company A - Manual (Page 10)

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of water. To over come this condition, it is recommended that a 3/8” by-pass arrangement
with a horizontal check valve be installed around the pressure regulator. This will prevent
annoyance caused by the relief valve dripping or blowing off.
3. Install in-line pressure and temperature gauge, if supplied.
4. 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
Temperature and Pressure Relief Valve
5. 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.
FILLING THE HEATER
1. Open the pressure relief valve test lever to allow air to escape.
2. Open the valve to the cold water inlet and allow the heater and piping system to completely
fill, as indicated by a steady flow of water from the relief valve.
ELECTRICAL INSTALLATION
1. Enter electric enclosure with properly sized feeder leads. Single-phase installations require
two (2) leads; three phase installations require three (3) leads.
2. Install these power leads into the box lugs on the terminal block or magnetic contactor. See
wiring diagrams below.
3. Torque screws per torque chart included in Section VI.
4. All other electrical connections are made at the factory; therefore, no other electrical
connections are necessary.