Start-Up/Subsequent Start-Up Of Dmh 254, 255 And - Grundfos DMH 25X Installation And Operating Instructions Manual

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!
Rod length of oil dipstick: 27 mm.
Note
Immersion depth to marking: approx. 5 mm.
Check the oil level at least every two weeks and add oil, if
necessary.
Only use original Grundfos gear oil!
Note
For product numbers, see "Service kit catalogue" on
www.grundfos.com
Pump model Version
DMH 251 Single/double
DMH 252, 10 bar Single/double
DMH 252, 16 bar Single/double
DMH 253 Single/double
After start-up
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,
Caution
cross-tighten the dosing head screws using a torque
wrench.
Torques
Pump model
DMH 251, 10 bar
DMH 251, 16 bar
DMH 251, 25 bar
DMH 252
DMH 253
Related information
6.1 General information on installation

8.3 Start-up/subsequent start-up of DMH 254, 255 and

Start-up of DMH 254, 255 and 257
Description
Pos.
1,3 l white oil
1q
(Paraffin 55 DAB7)
1,3 l white oil
3b
(Paraffin 55 DAB7)
1,3 l DHG 68
1,3 l DHG 68
1. Connect the electrical power supply.
2. Depending on the installation, start the pump, where possible,
3. Set the stroke-length adjustment knob (L) to 0 %.
Torque
4. Let the pump run for approx. 5 minutes.
[Nm]
5. Check the oil level.
8-10
10-12
13-15
8-10
10-12
The pump is now ready for operation.
Note
Note
Pump model
DMH 254
DMH 254
DMH 255
DMH 255
DMH 257
DMH 257
257
M F
1l
L
Components
Dosing head screws
2 Dosing head
Discharge valve
F Oil-filling screw with dipstick
L Stroke-length adjustment knob
1l Cover for stroke-length adjustment knob
M Pressure relief valve
without counter-pressure.
See installation example for easy deaeration of the dosing head
in section Installation.
• 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).
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!
Rod length of oil dipstick: 35 mm.
Immersion depth to marking: approx. 5 mm.
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
Version
Single
Double
Single
Double
Single
Double
M
3b
1q
2
Description
3,5 l DHG 68
4,5 l DHG 68
3,5 l DHG 68
4,5 l DHG 68
5,5 l DHG 68
7,5 l DHG 68
31