Rheem Water Heater - Manual (Page 41)

CONNECTIONS – ELECTRICAL
The power supply to the water heater must not be switched on until the
solar storage tank is filled with water and a satisfactory megger reading is
obtained.
MEGGER READING
When a megger test is conducted on this water heater, then the following
should be noted.
Warning: This water heater contains electronic equipment and 500 V
insulation tests must only be conducted between active and earth and between
neutral and earth. An active to neutral test WILL damage the electronics.
An insulation test result of between 100 KΩ and 660 KΩ for this water
heater is normal.
Typically the insulation resistance between live and earthed parts of an
electrical installation should not be less than 1
MΩ. However
AS/NZS 3000:2000 clause 6.3.3.3.2 ‘Results’ states:
“The value of 1 MΩ may be reduced to:
• 0.01 MΩ for sheathed heating elements or appliances; or
• a value permitted in the Standard applicable to electrical equipment.”
This model water heater is categorised as a ‘stationary class 1 motor operated
appliance’ and has been tested to AS/NZS 3350.1:2002 clause 16 ‘Leakage
current and electric strength’ and has passed the requirements of this
Standard. Therefore, this model water heater complies with the condition stated
in AS/NZS 3000:2000 clause 6.3.3.3.2 (b).
41