Bell & Gossett DN0141D Domestic Pump 2′ NPSH Horizontal Pumps Series DB-F - Manual (Page 5)

5
OPERATION AND MAINTENANCE
Operators must be familiar with all sections of this manual to
understand the operation of the unit.
Hot water, steam and electricity can be hazardous.
Check motor nameplate for any lubrication requirements.
NOTICE/AUTO RESTART
Single phase motors will restart automatically after thermal
overload protector trips.
Overload thermal relays in starters must be reset manually.
Specific maintenance and service instructions follow.
LUBRICATION
While pump is running regrease pump bearing with #2
lithium base petroleum grease about every 2500 hours of oper-
ation or every 6 months whichever occurs first.
Lubricate motor per motor manufacturer’s instructions.
GENERAL INSTRUCTIONS
1. Keep this pump and motor properly lubricated.
2. When there is a danger of freezing, drain the pump.
3. Inspect pump regularly for leaky seals or gaskets and
loose or damaged components. Replace or repair as
required.
SEAL REVISION
As of June 1997, DB and DB-F pumps use a Type 2 seal. This
seal is interchangeable with pumps that pre-date this cut-off
date. Regardless of date of manufacture of the pump, when
installing the Type 2 seal, the retaining ring is oriented with the
large OD facing the seal. (See illustration.)
1. Close pump isolation valve or system return line valve.
Operate pump momentarily to discharge as much water as
possible. Close pump discharge 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 air relief tube. Wait
for complete drainage.
5. Loosen both the discharge connection and the suction
housing to pump volute fasteners. Assure that pressure is
relieved per caution note.
WARNING: EXPLOSIBLE
Maximum suction pressure is 35 psi unless otherwise
specified by manufacturer. Do not exceed this pressure.
Failure to follow these instructions could result in serious
injury or death.
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.
SAFETY INSTRUCTIONS
SEE COVER OF THIS MANUAL
PUMP SERVICE INSTRUCTIONS FOR SERIES DB AND DB-F PUMP ENDS
CAUTION: HOT SURFACES
Surfaces may be hot when system is in operation. Do
not tough exposed components, let unit cool before servic-
ing. Failure to follow these instructions could result in seri-
ous injury or death.
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: PRESSURIZED SYSTEM
Operating system may contain very hot water under
pressure. Close inlet and open drains before servicing.
When servicing, loosen screws and move components to
assure pressure is relieved before removing screws. Keep
drains open during servicing. Failure to follow these instruc-
tions could result in injury or property damage.
Retaining
Ring
1.062
CAUTION: SUBSEQUENT DAMAGE
A unit showing symptoms of possible problems (over-
flow, noise, leaks, vibrations, continual operation, etc.) must
be corrected immediately. Failure to follow this instruction
may result in full liability for subsequent injury or property
damage.