8 Electrical Safety Tests
With the unit disconnected from the
AC power supply, and the power supply lead
plugged into the unit, perform the following
safety tests before returning the unit to the
customer.
8.1 Earth Bonding Test
Use a low resistance measuring
instrument to check that the resistance
between unit chassis and power cable earth
connector is less than 0.1 ohm.
8.2 Insulation Resistance Test
Set power switch to ON, and check
that cut out is reset by pressing reset button.
Connect the live and neutral pins of the
power supply plug together. Use a 500V
insulation resistance tester and measure the
insulation resistance between the earth and
live/neutral pins. This should be greater than
10 Mohm.
9 Final Inspection
a) Check that wiring is not trapped or nipped.
b) Check that the over temperature cut-out
bulb has been fitted correctly to the heater.
c) Check that cut-out has been correctly
screwed to the front panel and reset button
operates smoothly.
d) When re-fitting the cover ensure that the
earth wire is connected. Gently shake unit to
ensure there are no loose items left within
the unit.
GD100/GD120
Part No. 17592/Issue 1 July 2002
Page 16
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