Grundfos DMH 28X Instrucciones De Instalación Y Operación página 25

8.3 Start-up/subsequent start-up of DMH 281-288
M F
Fig. 26 Start-up of DMH 281-288
Pos. Components
1q Dosing head screws
2 Dosing head
3b Discharge valve
E Degassing valve
F Oil-filling screw with dipstick
L Stroke-length adjustment knob
1l Cover for stroke-length adjustment knob
M Pressure relief valve
V Deaeration screw
I Hose nipple (connection for J)
J Deaeration hose (not supplied with the pump)
1. Connect the electrical power supply.
2. Set the stroke-length adjustment knob (L) to 0 %.
3. Let the pump run for approx. 5 minutes.
Deaerating the dosing head
1. Loosen the deaeration screw (V) by 1 turn to the left.
2. Turn the hose nipple (I) vertically downwards.
Warning
Risk of injuries caused by the dosing medium.
Dosing medium leaks from the hose nipple (I) of the
deaeration line. If the pressure is high, the medium
may squirt out. Turn the hose nipple (I) in the right
direction, or drain the dosing medium through a
suitable hose.
When dosing dangerous media, observe the
corresponding safety precautions!
Wear protective clothing (gloves and goggles) when
working on the dosing head, connections or lines!
3. Set the stroke-length adjustment knob (L) to 15 %.
4. Let the pump run until the dosing medium flows from the
deaeration hose (J) or hose nipple (I) without any bubbles
back into the tank.
5. Tighten the deaeration screw (V).
3b E M
V
I
J
1l
L
1q
2
Checking the oil level
1. Set the stroke-length adjustment knob (L) to 40 %.
2. Let the pump run for approx. 10 minutes with a stroke-length
setting of 40 %.
3. Switch off the pump, check the oil level and add oil, if
necessary.
4. Refit the oil-filling screw (F).
The pump is now ready for operation.
Rod length of oil dipstick: 35 mm (27 mm for DMH
281).
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 281 Single
DMH 281 Double
DMH 283 Single
DMH 283 Double
DMH 285 Single
DMH 285 Double
DMH 286 Single
DMH 286 Double
DMH 287 Single
DMH 287 Double
DMH 288 Single
DMH 288 Double
After start-up
After initial start-up and after each time the
diaphragm is changed, tighten the dosing head
screws.
Caution
After approximately 6-10 operating hours or two
days, cross-tighten the dosing head screws using a
torque wrench.
Torques
Pump model
DMH 281
DMH 283
DMH 285
DMH 286
DMH 287
DMH 288
Description
1.3 l DHG 68
1.3 l DHG 68
3.5 l DHG 68
4.5 l DHG 68
5.5 l DHG 68
7.5 l DHG 68
5.5 l DHG 68
7.5 l DHG 68
5.5 l DHG 68
7.5 l DHG 68
3.5 l DHG 68
4.5 l DHG 68
Torque
[Nm]
17-19
27-30
50-54
80-85
50-54
75-80
25