User manual
6. Operation of motor pump unit
Installation, Operation and Maintenance Manual for PAHT / PAHT G 2-12.5 pumps
6.1 General safety information
Before inspecting the pump unit, read the Safety chapter 2 in this user manual .
6.2 What to listen and look for
If one or more of the following examples are observed, please act as indicated:
A) Loose bolts – check all bolts and, if necessary, contact the maintenance department in order to have all bolts tightened to the specified torque(s) .
B) Leakage – if a small leakage from the bell housing is observed . Contact the maintenance department .
C) Leakage – if there is a large leak, the unit should be stopped immediately . Contact the maintenance department .
D) High frequency tones – safety/relief valves are either damaged or running very close to their design pressure, stop the unit immediately . Contact the maintenance department .
E) Increased noise or vibration – requires the unit to be stopped immediately . Contact the maintenance department .
F) Very high temperatures – may indicate that one or more parts are damaged inside the pump . The pump must be stopped immediately and inspected before it is restarted . Contact the maintenance department .
G) Drop in flow and/or pressure – may indicate wear on one or more parts inside the pump . The pump must be stopped immediately and inspected before it is restarted . Contact the maintenance department .
H) Other observations or troubles, please see appendix 7, Right and Wrong or appendix
6, Trouble shooting guide . Both appendices give good advises on design, installation, wiring and troubleshooting .
If the pump is not stopped for inspection as recommended, it can lead to damage of the pump or break-down . See also service and warranty section in appendix 1, Data sheet and appendix 2, Instruction .
Danfoss offers service of the pump at the system manufacturer’s location as well as we offer training in how to service the pump . Quotes are offered upon request .
Danfoss recommends simultaneously to check the filter and membrane condition and to evaluate contamination; filter and membrane elements must be replaced if necessary .
7. Maintenance and service of the pump unit 7.1 General safety information
Before servicing the pump unit, it is necessary to read and understand this user manual, especially the Safety, chapter 2 . Remember to wear suitable safety equipment according to Safety, chapter 2 .
Danfoss offers service of the pump at the system manufacturer’s location and training in how to service the pump . Quotes are offered upon request .
7.2 Service and inspection interval for the pump
Maintenance and service intervals are depending on the cleanliness level of the water, hydraulic load and temperature of the pump unit . The most important parameter is the filtration of the water .
7.3 Shut down of the system
A) Stop the high-pressure pump .
B)
C)
Release the pressure .
Stop the feed pump if used .
See the section Service and warranty in the appendix 1, Data sheet and appendix 2, Instruction .
For spare parts and service tools, please see appendix 4, Parts list .
D) Switch off the safety circuit breaker for both the high-pressure pump, feed pump and VFD and lock them . Only personnel servicing the pump unit should be able to unlock/activate the switch again .
E) Open bleeding and drain plugs . Wait until the pump and system are emptied for water .
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180R9287 / IOM PAHT /PAHT G 2-12.5 pumps - v01 / 06.2013
User manual Installation, Operation and Maintenance Manual for PAHT / PAHT G 2-12.5 pumps
F) Slowly unscrew and remove the bolts and gaskets from the inlet/outlet hoses or pipes, be careful about jets of water . Be aware that the system can be pressurized .
G) Attach the lifting equipment to the pump unit . For instructions on lifting the complete pump unit, see chapter 4, Arrival inspection, transportation, handling, lifting and storage .
H) For the small pumps, unscrew the bolts holding the pump to the bell housing and for the bigger pumps, unscrew the bolts/ nuts from the pump and bell housing to the motor and afterwards unscrew the bolts/nuts holding the pump and bell housing .
Returns without a return number will be rejected !!!
7.5 Assembling the pump unit
Assemble the pump according to the Disassembling and Assembling Instruction (available at www . danfoss .high-pressurepumps .com) .
I) Carefully pull the pump out of the bell housing by using lifting equipment, if necessary .
J) Hold the pump in different positions above a drip tray; this should allow most of the water trapped in the pump to drain . Clean and dry the pump surface and plug the bleeding and draining plugs .
7.4 Disassembling and assembling the
A)
pump unit
Remove all connections from the pump .
7.6 Procedure for mounting the pump back onto electric motor
K) Move the pump to a clean and safe location where the pump can be inspected/ serviced .
Mount the flexible coupling and bell housing according to appendix 2, Instruction .
7.7 Getting the pump unit back into operation
Find instructions of how to put the pump unit back into operation in chapter 4, Arrival inspection, transportation, handling, lifting and storage and Installation and commissioning, chapter 5 .
B) Disassemble the pump according to the
Disassembling and Assembling Instruction
(available at www . danfoss .high-pressurepumps .com) .
Clean all the parts and surfaces with a fluid compatible with the materials found in the pump . Wipe the parts clean and dry with a lint-free clothing .
C) Inspect all parts including shaft seal and if necessary, replace them; see appendix 4,
Parts list .
D) If the pump is going to be returned to
Danfoss for repair or a warranty claim, it is important to contact Danfoss in order to receive a return number and a form to fill out with product information . A copy of the form together with contact information and reason for returning should be sent to the email address on the form . The same documents should be attached to the shipment .
7.8 Storage of the pump
If the pump has to be shut down for a longer period, instructions can be found in appendix 2,
Instruction .
180R9287 / IOM PAHT /PAHT G 2-12.5 pumps - v01 / 06.2013
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