－17－
4.3
Stopping the operation
To stop operation, close vacuum valve (A), open leak valve (B) quickly, and turn the
power switch b off .(see Figure2.）
Please close a leak valve (B) and seal a suction side as much as possible, after making
a suction side into atmospheric pressure.
4.4
Operation in cold climates
When using the pump in winter, in cold climates, or outdoors, it is sometimes difficult
to start the pump. This is an overload phenomenon resulting from the increase in the
viscosity of the pump oil. To start the pump in such conditions, warm up the pump oil,
or turn the pump on and off several times in short intervals.
When the pump stops after rotating for a few seconds, open leak valve (B) and continuous
operation may become possible. After the pump has warmed up, close leak valve (B) and
return to ordinary operation. (see Figure2.）
4.5
Thermal protector
An overload protector (Auto reset thermal protector) is incorporated.
Thermal protector activates when the pump motor is overloaded (e.g. locked rotor, out
range of voltage, close ventilation).
Table 3.Characteristics of the thermal protector
Model
Operation
temperature
Reset
temperature
GHD-031
1φ,100W
120℃±5℃
76℃±15℃
When the thermal protector has been actuated, turn off the switch and contact us.
The motor is very hot when the thermal protector has actuated. Never touch it with
your hand.
When the cause of the malfunction has been eliminated, check that the motor has cooled
down, and restart operation (see “6.4 Trouble check list”).
The use of another protective device (such as an earth leakage breaker) in addition
to the overload protector is recommended.
