31
O
pe
ra
tion
Before operation
This section describes pump operation and programming. Run the pump
after pipework and wiring are completed.
Before operation
First check tubing and wiring are correct. And then perform degassing and flow rate adjust
-
ment before starting operation.
Points to be checked
Before operation, check if:
• Liquid level in a supply tank is enough.
• Tubing is securely connected and is free from leakage and clogging.
• Discharge/suction valves are opened.
• Power voltage range is correct.
• Electrical wiring is correct and is free from the risk of short circuit and electrical leakage.
Retightening of pump head fixing bolts
Important
The pump head fixing bolts may loosen when plastic parts creep due to temperature change in storage or in
transit. This can lead to leakage. Be sure to retighten the bolts evenly to the specified tightening torque below
in diagonal order before starting operation.
Tightening torque
Model code
Torque
Bolts
EHN-B11/-B16/-B21
2.16 N•m
M4 Hex. socket head bolt
EHN-B31
2.55 N•m
M4 Hex. socket head bolt
EHN-C16/-C21
2.16 N•m
M4 Hex. socket head bolt
EHN-C31
2.55 N•m
M4 Hex. socket head bolt
EHN-C36
2.55 N•m
M5 Hex. socket head bolt
*Tighten fixing bolts once every three months.
■ Use of a hexagon wrench instead of a torque wrench
Fasten the fixing bolts as tight as can be by the hand with the straight long part of a hexagon wrench (a) and
further turn the bolts clockwise 90 degrees with the short part (b).
Operation
Straight long
part
Short part
a
b
90
°
Summary of Contents for EHN-B11-NAE
Page 67: ...67 Specifications ...
