32 Before operation
Run the pump after pipework and wiring is completed.
This section describes pump operation and programming.
Before operation
Check the flow rate, tubing and wiring. And then perform degassing and flow
rate adjustment before starting operation.
Points to be checked
Before operation, check if...
• Liquid level in the supply tank is enough.
• Tubing is securely connected and is free from leakage and clogging.
• Discharge/suction valves are opened.
• Proper power voltage is applied to the pump.
•
Electrical wiring is correct and is free from the risk of short circuit and electri-
cal leakage.
Retightening of pump head fixing bolts
Important
The pump head
fi
xing bolts may loosen when plastic parts creep due to tem-
perature change in storage or in transit.
This can lead to leakage. Retighten the pump head
fi
xing bolts before starting
operation.
Always tighten the bolts diagonally. See below for the tightening torque at each model.
Tightening torque
Model identi
fi
cation code
Torque
Bolts
EHN-B11•16•21
2.16 N•m
M4 Hex. socket head bolt
EHN-B31
2.55 N•m
M4 Hex. socket head bolt
EHN-C16•21
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
fi
xing bolts once every three months.
Operation
Summary of Contents for EHN-R
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