Bell & Gossett DN0162F HS Vented Boiler Feed Units Series HBF and VBF - Manual (Page 7)

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17. Close drain and slowly open inlet valves. See warning.
18. Jog to check motor rotation. See caution.
19. Observe operation thru several cycles.
Close coupled centrifugal pumps are designed for years of
trouble free service. Units have mechanical shaft seals.
1. Close inlet line gate valve and operate pump momentarily
to remove as much liquid as possible from pump. Close
discharge line gate valve.
2. Shut-off and lock out power.
3. Make sure unit is cool enough that pump can be handled
safely. Open drain to remove remaining liquid.
4. Carefully remove pump drain plug and bleed line. Wait for
complete drainage.
5. Loosen the motor bracket to pump volute capscrews.
Assure that pressure is relieved per caution note.
6. Complete the removal of the above hardware. Remove
pump/motor assembly and place on work bench.
7. Remove self locking stainless steel capscrews and stain-
less steel washer (or self locking brass cap nut and washer)
that secure the impeller in place.
8. To remove impeller from motor shaft proceed as follows:
(1) Keyed Shafts. Remove impeller with gear puller or
other means which will not damage impeller or bend
motor shaft.
(2) Threaded Shafts. Hold end of motor shaft opposite
pump with large screwdriver or other suitable tool and
back impeller with a rectangular bar or other flat tool
inserted between the vanes of the impeller.
9. Remove rotating part of seal from shaft, being careful not
to break carbon face.
10. Remove capscrews holding motor bracket to motor and
remove bracket.
11. Remove stationary part of seal assembly, being careful not
to chip or break ceramic seal.
12. To install new seal proceed as follows:
(1) Clean recess in bracket thoroughly. Coat recess and
“rubber” portion of seat with soap solution. Press seat
into recess firmly by hand making certain both parts
bottom evenly. If seal cannot be bottomed with fingers
place cardboard shipping disc on ceramic and force
into place with flat tool.
(2) Carefully place bracket in position on motor shaft with
out displacing ceramic seat and secure bracket to
motor with capscrews.
(3) Place motor vertically with pump end up. Do not
attempt assembly of seal and impeller with shaft
horizontal.
PUMP SERVICE INSTRUCTIONS FOR CENTRIFUGAL PUMPS
Vertical mounting puts motor above floor dirt and water
CAUTION / DO NOT RUN DRY. SEAL DAMAGE
MAY OCCUR: Inspect pump seal regularly for
leaks. Replace as required. Failure to follow these
instructions could result in injury or property damage.
WARNING / HIGH VOLTAGE: Disconnect and lock
out power before connecting or servicing unit.
Failure to follow these instructions could result in serious
injury or death.
CAUTION / HOT SURFACES: Surfaces are hot
when system is in operation. Do not touch hot re-
ceiver, let unit cool before servicing. Failure to follow
these instructions could result in injury or property damage.
CAUTION / PRESSURIZED SYSTEM: Operating
system may contain very hot water under pressure.
Close inlet and open drains before servicing. When ser-
vicing, loosen screws and move components to assure
pressure is relieved before removing screws. Keep drains
open during servicing. Failure to follow these instructions
could result in injury or property damage.
CAUTION / DO NOT REVERSE: Reverse operation
can cause extensive damage to pumps. Jog the
motor to test for direction of rotation. Failure to follow
these instructions could result in injury or property damage.
WARNING: EXPLOSIBLE
Do not pressurize receiver. Isolate receiver during
leak test. Do not plug overflow. Do not restrict vent opening
to atmosphere. Open valves slowly. Failure to follow these
instructions could result in serious injury or death.