Bell & Gossett DN0136C Domestic Pump Vacuum Heating Units Series VCL User Manual
Page 9
9
These closed coupled vertical centrifugal pumps are equipped
with mechanical seals. If system has not been properly cleaned
prior to installation of pump, foreign matter such as dirt, pipe scale,
core sand, etc. may clog the impeller and damage the seal. A
strainer is recommended in return line to pump.
Pump must not be
operated dry
. Seals may be damaged if operated without water
present.
1. Close inlet line gate valve and operate pump momentarily to
remove as much liquid as possible from pump. Close dis-
charge line gate valve.
2. Shut-off and lock out power.
3. Disconnect wiring to motor.
4. Make sure unit is cool enough that pump can be handled
safely. Open receiver drain to remove remaining liquid.
5. Loosen the motor to pump volute fasteners. Assure that pres-
sure is relieved per caution note.
6. Remove four capscrews (7) holding pump case to motor and
lift motor and impeller out of pump case.
7. Remove pump/motor assembly and place on work bench.
8. Hold top end of motor shaft with large screwdriver via screw-
driver slot in shaft and back off impeller (counter-clockwise)
with a rectangular bar or other flat tool inserted between
vanes of the impeller.
9. Remove the rotating part of the mechanical seal from the end
of the shaft.
10. Remove seal holder (2) with stationary ceramic part of
mechanical seal and cup rubber from the end of the shaft.
11. Remove stationary ceramic part of mechanical seal and cup
rubber from recess in seal holder.
12. To install new seal proceed as follows: Clean recess in seal
holder thoroughly. Orient motor so that conduit opening on
motor is left when looking at motor shaft. Replace seal
holder on the face of the motor maintaining concentricity with
motor face. Place new ceramic part of seal in the cup rubber
over motor shaft and press firmly into recess of seal holder by
hand, making certain both parts bottom evenly. If assembly
cannot be bottomed with fingers place a wooden or card-
board tube over shaft onto ceramic and push into place. Using
a clean, lint-free cloth, wipe the mating surfaces of the seal
clean of any foreign matter. Moisten the carbon section of the
rotating part of the seal and place onto shaft to seat against
ceramic. Place seal spring on to shaft.
13. Hold motor shaft as described in #8 and replace the impeller
on the shaft (clockwise rotation) making sure it is tight.
14. Orient motor for pump reassembly with conduit opening to the
left. When mounting the pump case, discharge should be 90º
to the right of conduit opening on motor. Use care to insure
tight gasket fit to prevent water leakage.
15. Replace four capscrews (7). Tighten down capscrews evenly
to avoid damage.
16. Reconnect pump bleed line (where applicable) and motor
wiring.
17. Close drain and slowly open inlet valves. See warning.
18. Jog to check motor rotation. See caution.
19. Observe operation thru several cycles.
CAUTION:
PRESSURIZED SYSTEM
Operating system may contain very hot water under
pressure. Close inlet and open drains before servicing. When
servicing,
loosen scr
ews
and move components to assur
e
pressure is relieved before
r
emoving 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.
CAUTION:
DO NOT RUN DRY.
SEAL DAMAGE MAY OCCUR.
Inspect pump seal r
egularly for leaks. Replace as required.
Failure to follow these instructions could result in injury or
property damage.
W
ARNING: HIGH VOLTAGE
Disconnect and lock out power befor
e connecting or
sevicing unit. Failure to follow these instructions could result
in injury or property damage.
PUMP SER
VICE INSTRUCTIONS MODEL FOR 609PF CENTRIFUGAL PUMPS ONLY
CAUTION: HOT SURFACES
Surfaces ar
e hot when system is in operation. Do not
touch hot receiver, let unit cool before servicing. Failure
to follow these instructions could result in injury or property
damage.
W
ARNING: EXPLOSIBLE
Do not pr
essurize 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.
1. Motor
2. Seal Holder
3. Seal
4. Impeller
5. Gasket
6. Case
7. Capscrew
(motor to
volute)
8. Wear Ring
9. Pipe Plug
10. Slinger
1
10
7
3
4
8
6
9
5
2
FIG. 12
2DPF01