Rheem 874 Owner's Manual And Installation Instructions page 57

DUAL INSTALLATION
Install two continuous flow 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
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.
A full flow gate valve or ball valve must be installed on the cold water line to the system. A non return
2.
valve or stop tap must not be installed.
A full flow gate valve or ball valve (not a stop tap) should be installed on both the cold water branch and
3.
hot water branch of each water heater.
An isolation valve must be installed on the gas branch of each water heater.
4.
Non return valves or pressure limiting valves must not be installed on the branch lines to the water
5.
heaters.
All fittings, valves and branch lines should be matched sets to each of the water heaters.
6.
7. Sufficient space must be left to enable access, servicing or removal of either water heater.
„Typical Two Unit Manifold with Ez-Link Connection‟
Refer to the
plant layout details.
LABELS
A warning label (121109) and an AGA approval label (121901) are
supplied in the Ez-Link kit. Where the two water heaters are installed close
together and the warning label and AGA approval label on the inside face
of the right hand water heater cannot be read, it is necessary to adhere the
two labels supplied to the right-hand face of the water heater.
8. Place the warning label below the rating label.
Place the AGA approval label beside the barcode label.
9.
„Label Positioning‟
Refer to the
labels to be adhered to the water heater.
A second rating label is attached to the inside of the front cover. This can
be referenced to determine details of the left hand water heater.
TEMPERATURE CONTROLLER
A temperature controller is not required to be installed with the EZ-Link system. If fitted, the controller can be
either a standard or Deluxe controller.
If required 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
page 60.
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 controller should only be installed if two continuous flow gas water heaters have been Ez-Linked together
and they are not part of a circulated hot water flow and return system in a building. Refer to
Water Flow And Return System"
diagram adjacent for the position of the two
on page 47.
57
®
manifold plumbing arrangement.
diagram on page 59 for installation and
    

  
    
  
  
DO NOT OPERATE THIS APPLIANCE BEFORE
READING THE INSTRUCTION
BOOKLET.
DO NOT PLACE ARTICLES ON OR AGAINST
THIS APPLIANCE.
DO NOT STORE CHEMICALS OR FLAMMABLE
MATERIALS, OR SPRAY AEROSOLS
NEAR THIS APPLIANCE.
DO NOT OPERATE WITH PANELS, COVERS
OR GUARDS REMOVED FROM THIS
APPLIANCE.
DO NOT ENCLOSE THIS APPLANCE.
CERTIFIED FOR OUTDOOR INSTALLATION ONLY
To operate the water heater
Open the inlet water and gas valves fully
Plug appliance into mains power outlet and switch on
Turn on remote temperature controller(s) if fitted
Open a hot tap - the heater will operate automatically
To shut down the water heater
Close the inlet water and gas valves fully
Turn off remote temperature controller(s) if fitted
If power will be disconnected, refer to the owners guide
regarding draining the appliance to avoid damage due to
freezing
AS 3498
N199 WMKA21434
Label Positioning
"Installation – Controllers"
121109 AD
on
"Circulated Hot