Hubbell Electric Heater Company WATER HEATER DF - Manual (Page 15)

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3. A Rule of Thumb to determine total suction for suction line sizing is to add 10% to suction
determined from the burner manufacturer's instruction manual.
4. It is good practice to size the oil pump return-line (to the tank) the same size as the selected
suction line.
PRESSURE AND TEMPERATURE SAFETY RELIEF VALVE
1. 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
2. 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.