Rheem 743 series Owner's Manual And Installation Instructions page 5

HOW YOUR BOILING WATER UNIT WORKS
TO TURN OFF THE BOILING WATER UNIT
The boiling water unit is supplied with a programmable timer. We recommend the
timer is used to conserve energy.
If it is necessary to turn off the boiling water unit:
 Switch off the electrical supply at the isolating switch to the boiling water unit.

Close the cold water isolation valve on the supply to the boiling water unit.
TO TURN ON THE BOILING WATER UNIT

Open the cold water isolation valve fully on the cold water supply to the boiling
water unit.

Switch on the electrical supply at the isolating switch to the boiling water unit.
Note:
The boiling water unit may not appear to turn on immediately when it is first switched
on, as the electronic controller will automatically check the system prior to allowing
water into the boiling water unit (this could take up to 10 seconds).
On initial start up, this boiling water unit automatically runs through a set-up cycle to
detect the boiling point of water. During this cycle, steam will discharge from the vent
pipe several times for a short time. This set-up cycle will take up to 18 minutes, and
when completed (once boiling point is determined) the unit will commence
incremental filling. It is important NOT to operate the tap during the set-up cycle
because it may affect the operating temperature of the unit.
IS THIS BOILING WATER UNIT INSTALLED CORRECTLY?
Installation requirements are shown under Installation (on page 19).
The boiling water unit must be installed:

by a qualified person, and

in accordance with the installation instructions, and

in compliance with Standards AS/NZS 3500.4, AS/NZS 3000 and all local
codes and regulatory authority requirements.
In New Zealand, the installation must also conform to Clause G12 of the New Zealand Building Code
DOES THE WATER QUALITY AFFECT THE BOILING WATER UNIT?
The boiling water unit is suitable for most public water supplies, however some water
qualities may have detrimental effects on the boiling water unit and fittings. If you are
in a known bad water area you must first read Water Supplies on page 26. If you
are not sure, have your water quality checked against the conditions described on
page 26.
Rheem New Zealand Ltd
5
743 Series BWU Document #: 318489B