Page 8 Oil-Fired BCS
PLACE WATER SYSTEM IN OPERATION
1. Fill the tank with water, opening a hot water faucet to allow trapped air to escape from the
heater. Open the cold water inlet valves. Shut off each faucet as it delivers water that is free
of air. Inspect for leaks. Never operate an empty or partially full heater.
2. Be sure the oil tank is filled with #1 or #2 heating oil. Loosen the ignitor hold down screw
and swing the ignitor back open on the hinge. Rotate the blower wheel a few times to
loosen the pump shaft. Swing the ignitor closed and fasten.
3. Bleed air from the oil line by opening the bleed valve on the fuel pump. Attach a small
plastic tube to the bleed valve fitting on the pump and run to a gallon container. Turn on
the electricity and set the thermostat so the burner motor runs. The heater will not ignite
when the bleed valve is open. Bleed the line until the oil is completely clear, not milky or
opaque. The oil must be transparent and free of air bubbles and froth. To keep the burner
control from locking out while bleeding the pump, attach a jumper between the flame
detector terminals after starting the burner. Remove the jumper when finished. Shut the
bleed valve and the burner will ignite. Remove the plastic tubing. Set the pump pressure to
100 PSI.
4. Adjust the burner combustion air in accordance with the burner manufacturer’s instruc-
tions. Using combustion instruments, check the CO
2
and smoke. The CO
2
should be at least
10
1
⁄2% with 0-to-trace smoke on the Bacharach scale (see burner installation manual.) No
draft adjustment is required. Your Bock BCS water heater will operate under draft or low
positive pressure depending on installation.
5. While the burner is operating, disconnect one of the yellow cad cell wires. Check to see
that the burner control locks out in the time specified on the control. Reattach the wire
and reset the control. The burner should restart. Note: You may have to wait a minute
before resetting the control.
INSPECT THE INSTALLATION AND ADJUST THE CONTROLS
The thermostat has been adjusted to 120°F at the factory. Wait until thermostat has shut off
fuel to the burner. Wait 30 seconds following shut-off of fuel, then set thermostat to the high-
est temperature. The burner should relight. Set thermostat to the lowest temperature; the
burner should go out. The thermostat should be adjusted to the minimum setting that will
meet the hot water needs of the homeowner or commercial application.
CAUTION: There is a scald potential if the thermostat is set too high.
The recommended
temperature setting for normal residential use is 120°F.
If higher temperature settings
are needed for combined appliance applications or commercial use, an automatic
tempering valve must be installed on all domestic hot water lines. Should overheating
occur, or the fuel supply fail to shut off, turn off the electricity to the water heater.
MEASURING THE OUTCOMING WATER TEMPERATURE
The thermostat is factory set at 120°F for residential use. (See the caution above regarding tem-
perature variations.) It is the responsibility of the homeowner and installer to verify that the
installer follows the recommended quantitative testing for measuring the out-coming water
temperature. To make sure that the system works properly after installation and in the future,
it is recommended that the heater’s performance be measured and monitored. Run water out
of the tap nearest the heater until it comes out warm. Using a calibrated thermometer, take a
measurement. If the water is not at a suitable temperature for the installation, have a qualified
service person adjust the aquastat. Contact Bock for further information if needed.
This log (or a similar one) should be filled out as follows:
