ARYUNG specifications

Operating data

Limits and construction.

Use fluid	Water-soluble coolant, cutting oil, grinding oil
Viscosity	1–32 cSt; 1–2 cSt for multi-stage / high-pressure series
Use temperature	80 °C maximum
Protection class	IP44 / IP54 depending on model
Insulation class	F
Motor frame	Die-cast aluminium (ALDC)
Casing / pump body	Cast iron (FC250)
Impeller	Powder steel; cast iron on ACP-EF; stainless on ACPQ-HSP
Shaft	Steel
Outlet options	Screw outlet as standard; flange outlet (F) on MF / BMF

`ACP`	ARYUNG coolant pump family
`400`	Motor output in W — 60 to 5500 W across the range
`MF / BMF / HMFS / HSP / A / EF`	Hydraulic series and pump type
`F`	Flanged outlet where the series offers it
`18 / 25`	Immersion depth in cm — 180 mm / 250 mm
`2/2 · 2/3 · 4/4`	Voltage code: 200/220 V · 220/380 V · 415/440 V

Example: ACP-400MF(S) F 2/2 — 400 W multi-stage immersion pump, flanged outlet, 200/220 V.

Installation

Prime horizontal pumps (ACP-A, ACPQ-HSP, ACP-HMFD-H) before the first start and after a long stop. No dry running over 30 seconds.
Pour priming liquid into the discharge side until air is completely expelled through the suction port.
Keep the suction pipe of a horizontal pump to 0.6 m or less; keep the suction opening at least 20 mm from the tank bottom and walls.
Install horizontal pumps on a firm base; use a suction hose or pipe that will not collapse.
ACP-HMFD-H and ACPQ-HSP are high-pressure pumps — fit an accumulator if water hammer is expected.
ACP-HMFD-H and ACPQ-HSP: install a pressure shock absorber if the piping layout can produce water hammer.
ACPQ-HSP: keep suction pipe height within 2 m and use a 1/2" high-pressure hose; a larger hose can overload the motor.
Check the nameplate and wiring diagram, then confirm rotation direction before coupling the pump to the machine.
Centrifugal coolant pumps can be throttled on the discharge side; do not run fully closed for long periods — oil temperature will rise.
Check coolant viscosity before use (1–32 cSt; 1–2 cSt for multi-stage and high-pressure series).

Fault finding

From the catalogue. Check wiring, rotation, viscosity and suction conditions before opening the pump.

Fault condition	Cause	Measure
No rotation, no sound	Supply short circuit or poor connection	Check wiring and connections
No rotation, no sound	Motor winding short circuit	Return to factory for repair
No rotation, with sound	Voltage too low	Check voltage
No rotation, with sound	Bearing wear / sticking	Replace bearing
No rotation, with sound	Stator and rotor contact	Return to factory for repair
No rotation, with sound	Foreign matter in the fan	Remove foreign matter
Motor overheating	Voltage high, low or unbalanced	Regulate / check voltage
Motor overheating	Winding partial short circuit	Return to factory for repair
Motor overheating	Bearing wear	Replace bearing
Reduced discharge	Suction pipe drawing air	Check suction piping
Reduced discharge	Air bubbles in the coolant	Fit an overflow; separate return and suction tanks
Reduced discharge	Pump running in reverse	Swap two of the three phase terminals
Reduced discharge	Blocked piping	Inspect pipe; remove foreign matter
Reduced discharge	Mechanical seal wear	Replace mechanical seal
Poor pressure	Discharge valve closed or throttle valve fitted	Open the valve; open the air vent
Abnormal sound / vibration	Bearing wear	Replace bearing
Abnormal sound / vibration	One phase short circuit	Check for short circuit
Water hammer	Sudden valve opening / closing	Fit a pressure shock absorber

Wiring

Check the nameplate and wiring diagram, then confirm rotation before coupling the pump to the machine.

Wiring diagram 1 · catalogue p.105

Wiring diagram 2 · catalogue p.105

Wiring diagram 3 · catalogue p.105

Wiring diagram 4 · catalogue p.105