Grundfos DMH 25X, Installation And Operating Instructions Manual

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Warning
Risk of injury caused by squirting oil!
Oil may squirt from the oil deaeration when the pump is
running. Do not completely unscrew the oil deaeration
screw.
Wear protective clothing (gloves and goggles) when work-
ing on the dosing head, connections or lines!
Note
Rod length of oil dipstick: 27 mm.
Immersion depth to marking: approx. 5 mm.
Note
Check the oil level at least every two weeks and add oil, if
necessary.
Only use original Grundfos gear oil!
For product numbers, see "Service kit catalogue" on
www.grundfos.com
Pump model Version Description
DMH 251 Single/double
1,3 l white oil
(Paraffin 55 DAB7)
DMH 252, 10 bar Single/double
1,3 l white oil
(Paraffin 55 DAB7)
DMH 252, 16 bar Single/double 1,3 l DHG 68
DMH 253 Single/double 1,3 l DHG 68
After start-up
Caution
After initial start-up and after each time the diaphragm is
changed, tighten the dosing head screws.
After approximately 6-10 operating hours or two days,
cross-tighten the dosing head screws using a torque
wrench.
Torques
Pump model
Torque
[Nm]
DMH 251, 10 bar 8-10
DMH 251, 16 bar 10-12
DMH 251, 25 bar 13-15
DMH 252 8-10
DMH 253 10-12
Related information
6.1 General information on installation
8.3 Start-up/subsequent start-up of DMH 254, 255 and
257
L
F
1l
2
M M
1q
3b
TM036463
Start-up of DMH 254, 255 and 257
Pos. Components
1q Dosing head screws
2 Dosing head
3b Discharge valve
F Oil-filling screw with dipstick
L Stroke-length adjustment knob
1l Cover for stroke-length adjustment knob
M Pressure relief valve
1. Connect the electrical power supply.
2. Depending on the installation, start the pump, where possible,
without counter-pressure.
See installation example for easy deaeration of the dosing head
in section Installation.
3. Set the stroke-length adjustment knob (L) to 0 %.
4. Let the pump run for approx. 5 minutes.
5. Check the oil level.
• Set the stroke-length adjustment knob (L) to 40 %.
• Let the pump run for approx. 10 minutes with a stroke-length
setting of 40 %.
• Switch off the pump, check the oil level and add oil, if
necessary.
• Refit the oil-filling screw (F).
The pump is now ready for operation.
Warning
Risk of injury caused by squirting oil!
Oil may squirt from the oil deaeration when the pump is
running. Do not completely unscrew the oil deaeration
screw.
Wear protective clothing (gloves and goggles) when work-
ing on the dosing head, connections or lines!
Note
Rod length of oil dipstick: 35 mm.
Immersion depth to marking: approx. 5 mm.
Note
Check the oil level at least every two weeks and add oil, if
necessary.
Only use original Grundfos gear oil!
For product numbers, see "Service kit catalogue" on
www.grundfos.com
Pump model Version Description
DMH 254 Single 3,5 l DHG 68
DMH 254 Double 4,5 l DHG 68
DMH 255 Single 3,5 l DHG 68
DMH 255 Double 4,5 l DHG 68
DMH 257 Single 5,5 l DHG 68
DMH 257 Double 7,5 l DHG 68
31
English (GB)