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EZ LINK SYSTEM DUAL INSTALLATION
68
DUAL INSTALLATION
The two water heaters can be installed side by side with minimal clearance between them. Rheem 874 and
876 series 812, 816, T16, 820, 826 and T26 models are certified for installation with an exemption from the
300 mm minimum clearance requirements between flue terminals, as stated in AS/NZS 5601.1 clause 6.9.3.
Install two water heaters of the same model in a parallel plumbing arrangement. It is good practice, but not
essential, to install the two water heaters in an Equa-Flow
®
plumbing arrangement. There are basic installation
requirements which must be followed:
1. The pipe work must be sized to meet the requirements of both AS/NZS 3500.4 and the application. It is
recommended to use minimum DN25 pipe for the cold water line, cold and hot headers and hot water line
and DN20 for the cold and hot water branch lines of each water heater.
2. A full flow gate valve or ball valve must be installed on the cold water line to the system. A non-return
valve or stop tap must not be installed.
3. A full flow gate valve or ball valve (not a stop tap) should be installed on both the cold water branch and
hot water branch of each water heater.
4. An isolation valve must be installed on the gas branch of each water heater.
5. Non-return valves or pressure limiting valves must not be installed on the branch lines to the water heaters.
6. All fittings, valves and branch lines should be matched sets to each of the water heaters.
7. Sufficient space must be left to enable access, servicing or removal of either water heater.
Refer to the
‘Typical Two Unit Manifold with EZ Link Connection’ diagram on page 71 for installation and plant
layout details.
RATING LABEL INFORMATION
There is information on the rating label located on the right hand side of the water heater, which may be
required for future warranty and service requirements. This information will be hidden on the left hand water
heater if the two water heaters are installed with minimal clearance between them.
Move the rating label to or indelibly copy the water heater serial number, manufacture date and model number
from the label onto the left hand side or front panel of the left hand water heater or to another position which
is visible when the water heater is installed so the householder or responsible officer can access the water
heater details when required.
A second rating label is attached to the inside of the front cover. This is for a service person to access the
water heater details when required.
TEMPERATURE CONTROLLER
A temperature controller(s) may be installed but is not required to be installed on the Rheem 874 and 876 series
812, 816, T16, 820, 826 and T26 model water heaters with the EZ Link system. The controller can be either a
standard or Deluxe controller.
Warning: Temperature controllers must not be fitted to a water heater (874 series) if it is installed as an
in-series gas booster with a solar water heater system because water at a temperature much higher than the
controller setting can be delivered.
Connect a temperature controller to one only of the two water heaters. Up to three temperature controllers of
the same family can be installed to this water heater. Refer to
“Installation – Controllers” on page 72.
The water heater connected with the temperature controller(s) will become the ‘master’ water heater. The
installed temperature controller(s) will control the temperature and functionality of both water heaters.
The maximum outlet temperature of the water heaters will be limited by the maximum temperature setting of
the temperature controller.
A temperature controller should not be installed if two 874 series 812, 816, T16, 820, 826 or T26 model water
heaters are installed with an EZ Link system and they are part of a circulated hot water flow and return system
in a building. Refer to
“Circulated Hot Water Flow And Return System” on page 55.
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