Connection To The Mains; Pump Start-Up; Fillig And Air Removal; Pump Speed Adjustment - EBARA MR Use And Maintenance Manual

5.2.1 CONNECTION TO THE MAINS

The electrical connection must be carried out following the wiring diagram (fig. 3) given on the bottom of motor cover.
Before proceeding with wiring, you should remove the top cover (fig. 1 - POS. 2)
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6. PUMP START-UP

6.1 FILLIG AND AIR REMOVAL

Given that the impeller is immersed in water and placed on special bearings, that are also lubricated by water, before
starting the pump you must fill it with water and remove the air. To vent the pump, remove the screw fitted on the rear
side of the electric motor (fig. 1 – POS. 5), that allows air to be expelled through the hole between the motor shaft and the
bearing. When the water begins to flow out, you have to close the valves both on the intake and the delivery lines. Now
start the pump and check the direction of rotation. If the shaft is moving in incorrect direction, the red indicator light starts
flashing. The pump can also signal other malfunctions that are described in the table below. The number of flashes of the
red light indicate the number of the fault. Each series of flashes is followed by a longer interval: the number of flashes
between two intervals indicates the code of the fault.
The pump can reach high temperatures, depending on the operating conditions of the pump and the
system (fluid temperature). Do not touch the pump! Burn hazard!

6.2 PUMP SPEED ADJUSTMENT

Each pump can operate according to 3 specific curves, due to the possibility to set the motor at 3 different speeds. Select
the desired curve
can be set both manually, setting the curves
regulation is set or
the speed based on the
if the value gradually decreases below 10°C the pump automatically switches to speed
by at least 20°C, the pump automatically switches to speed
reaches at least 20° C, the pump switches to variable automatic operation within the different curves, according to the
flow rate. This operating mode is suitable for systems equipped with thermostatic valves and those in which the overnight
temperature drops.
10
using the key (fig. 1 - POS. 4) that switches motor's speed. The speed of MR pumps (auto)
(night-time operation) using the key
momentary flow rate. During night-time operation
Fig. 3
with the key , and automatically by the pump itself, if the automatic
. In automatic mode,
. When the temperature of the fluid increases again and
the pump automatically selects
the fluid temperature is measured and
; if the temperatures drops