Bock Water heaters 33PP, 50ESC, 51PP, 40PP, 51EC, 40E, 32EC, 20E, 33E, 32PPC, 20PP instruction manual

CONNECT TO

CHIMNEY

MOUNT THE OIL BURNER

CONNECT THE

ELECTRICITY

CONNECT THE OIL LINE

WARNING!! WHEN YOU INSTALL THE BYPASS PLUG YOU MUST RUN A TWO-LINE SYSTEM.

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Inspect the incoming water line for check valves or water pressure reducing valves. Any type of check valve may cause pressure to build up in the heater and cause tank failure. If the heater is installed in a closed system or if backflow pre- venters and pressure regulators are installed, add an expansion tank. Do not try to heat hard water. Install a water softener if the heater is being used in a hard water area (water hardness more than 7 grains).

An approved temperature and pressure (T&P) relief valve is factory installed in the opening provided in the upper right hand side of the heater. Pipe the T&P to within 6" of the floor or to a floor drain with a free flowing drain pipe. Do not install a check valve in the cold water line.

Using “L” or “A” type venting, connect the heater to the chimney. Use the same size smoke pipe as the heater flue pipe (on models 20e, 20pp, 32E, 32PP and 33E, you may use 4" with a reducer if needed).

WARNING: On Models 40E, 5OES, 50ESC, 51E, 51EC, 51PP, 51PPC. 71E and 120E, do not reduce the smoke pipe diameter. Run a separate smoke pipe from the water heater to the chimney wherever possible.

If it is necessary to tee into an existing smoke pipe, be sure the connector being teed into is large enough to accommodate the products of combustion of all units attached to it. When teeing into another connector, run in at 45° angle (see Figure 1). Install a draft regulator control only if necessary. Overfire draft should not be positive. Stack draft should be -.02” W.C. minimum to -.05” W.C. maximum; CO2 should be a minimum of 11%. If a draft control is installed on the chimney, another one on the heater is not needed.

The oil burner is equipped with a primary relay. An aquastat with immersion well is packed with the burner. The thermostat is factory set at 120°F for residen- tial use (see caution on page 1 regarding temperature variations). Install the immersion well with the aquastat and check the bulb length (see “Burner & Controls” section, page 10).

Remove the cardboard core from the burner opening. Mount the burner on stud bolts and place the gasket (supplied) between the burner flange and the heater. Secure the burner to the heater with 1/4 -20 nuts (supplied). Open the inspection door on the heater and check the burner tube with a mirror before firing to be sure the opening is not blocked (see Maintenance and Service sections on pages 6 and 7 for troubleshooting).

All wiring must comply with applicable codes and ordinances. The primary relay is wired to the burner at the factory. Install the aquastat well in the 3/4" tapping at the front of the heater. Be sure the sensing bulb is inserted all the way into the well. For Honeywell aquastats, tighten the screw on top of the aquastat to secure the control to the well. For Carlin EZ-Temp aquastats, refer to the pre-packaged installation guide for proper set-up procedure. Refer to drawings for correct mod- els. Connect the power supply to the aquastat and run through a fused discon- nect switch (attached to heater in field). See Figure 1.

Gravity System: The oil burner is normally equipped with a single-stage pump equipped for one line (gravity) flow. Use 1/2" O.D. soft copper tubing and attach with flared fittings. DO NOT USE COMPRESSION FITTINGS. Install the shut off valve and oil filter in the oil line. Follow the pump manufacturer’s instructions (attached to the pump).

Lift System: The burner should be ordered with a 2-stage pump. Run a 2-line system (suction and return lines). Install the bypass plug according to the instructions attached to pump (plug is in a bag with an instruction sheet).