Hastings COUNTERFLO CF SERIES, Installation And Service Manual

Page: 30 / 36

4. If main flame is not established, check to see if:
a. Pilot has been established.
b. Flame detector is sensing pilot.
c. Programming relay is functioning properly.
B. TROUBLESHOOTING OIL-FIRED UNITS
An adequate fuel supply must be available at the unit for proper operation. Check the
specification plate or bill of material for proper fuel supply pressure. Unit control box
voltage must be within
± 10 volts of that which is specified on the specification plate for
proper operation.
Repeat steps 1 through 4 as previously outlined in troubleshooting gas-fired models.
C. WEBSTER ELECTRIC TWO-STAGE FUEL PUMP FOR OIL-FIRED UNITS
This unit, manufactured by Webster, is depicted in Figure 13 and may be used on either
single-pipe or two-pipe systems. It is shipped from the factory set for single-pipe operation.
When two-pipe installation is required, pipe plug included in envelope should be inserted in
unit as shown in Figure 13 and tightened securely with 3/16” Allen wrench.
1. Procedure for single-pipe installation (preferred where bottom of tank is above fuel unit):
a. Remove pipe plug from regular or optional inlet, as preferred. Connect inlet line using
¼” PT fittings.
b. Tighten pipe plugs in unused inlet and two return line ports.
c. Start burner and bleed all air from system by removing gage port plug. Allow oil to
flow until it is clear, then replace plug and tighten securely.
2. Procedure for two-pipe installation:
a. Remove ¼” pipe plug from optional inlet. Insert bypass plug furnished and tighten
securely with 3/16” Allen wrench.
b. If inlet connection is to be made to the same port, connect inlet line with ¼” PT
fittings. Otherwise, replace ¼” pipe plug and connect inlet line to opposite port.
c. Remove pipe plug from regular or optional return port, as preferred, and connect
return line, using ¼” PT fittings. Tighten ¼” pipe plug securely in unused port.
D. SUNDSTRAND FUEL PUMP FOR OIL-FIRED UNITS
This pump, manufactured by the Sundstrand Machine Tool Company, is used to transfer oil
from the supply tank to the heater (if tank is located within 100’) and to deliver oil to the
burner nozzle at 100# pressure.
Field service, other than pressure adjustment and strainer cleaning, is not recommended.
The pump can be readily detached from the mounting base and motor coupling for
replacement on an exchange basis. Contact Hastings HVAC Service Department for details.
-27-