4
ABOUT YOUR WARM WATER SYSTEM
WATER HEATER APPLICATION
This warm water system is designed for the purpose of providing potable water. Its use in an application other
than this may shorten its life.
MODEL TYPE
Congratulations for choosing Rheem Guardian Warm Water. The model you have chosen will be either an 80,
160 or 240 litre/min model. Warm water is produced by blending hot water from separate water heating plant,
with cold water by means of thermostatic mixing valve(s). The warm water unit can be installed either indoor or
outdoor. The system is supplied in a tamperproof cabinet. A UV disinfection unit is supplied with the warm water
system and forms part of a maintenance regime to safeguard against Legionella.
MAINS PRESSURE
Rheem Guardian is designed to operate at mains pressure by connecting directly to the mains water supply. The
cold and hot water supply to the unit is taken from the same source and the pressures should be nominally
balanced. If the mains supply pressure in your area exceeds that shown on page 11, a pressure limiting valve
must be fitted. The supply pressure should be greater than 500 kPa for true mains pressure operation to be
achieved.
HOW HOT SHOULD THE WATER BE?
The water temperature should be set in accordance with
local authority requirements for the intended application.
The system is factory set at 43
C. Following
commissioning, the system can be set to operate within
the temperature limits as shown on page 7 under normal
operating conditions.
Normal Operating Conditions
are considered as:
- inlet pressures nominally balanced to within 10% of each
other during flow.
- a differential of approximately 50
o
C between the hot and
cold inlet temperatures, and with differentials of
15-35
o
C between the blend setting and either supply.
- installation and usage environment not subject to
extremes of temperature, unauthorised tampering or willful
abuse.
To meet the requirements of the National Plumbing
Standard the temperature of stored hot water must not be
below 60°C.
TEMPERATURE ADJUSTMENT
The warm water system features tradesperson adjustable
thermostats. They require a licensed tradesperson to
make any temperature adjustments. We advise the thermostats are adjusted to the lowest temperature setting
that meets your needs, especially if there are young children or elderly people in the premises.
The Rheem warranty may not cover faults if relief valves or other safety devices are tampered with or if
the installation is not in accordance with these instructions.
PRECAUTIONS
Where damage to property can occur in the event of the water heater leaking, the water heater must be installed
in a safe tray. Construction, installation and draining of a safe tray must comply with AS/NZS 3500.4 and all local
codes and regulatory authority requirements.
If this warm water system is to be used where an uninterrupted warm water supply is necessary for your
application or business you should ensure that you have back up redundancy within the hot water system
design. This should ensure the continuity of warm water system in the event that this warm water system were to
become inoperable for any reason. We recommend you seek advice from your plumber or specifier about your
needs and building back up redundancy into your warm water system.
Maximum hot water
supply temperature to
warm water system
(70
°
C)
Factory set warm water
supply temperature
(43
C)
Minimum hot water
supply temperature
(60
C)
