Rheem SP20892 Installation And Instruction Manual

Cascade System Installations and Instruction Manual
1. About Rheem Cascade System
• Cascade System can allows up to 2 units.
• All units within Cascade System must be of the same type.
• Different types cannot work as Cascade System.
■ Included parts on KIT
Before installing this KIT, verify that the parts contained in this KIT with followed table.
# Parts
1
Cascade System Cable
2
Manual
2. Overall System Diagram
Cascade
System
Cable
[NOTE]
• The Cascade System Cords are 6 feet (1.8 m) long each. Install the units 2~18" (50~457
mm) apart from each other to ensure the cable will be able to reach between the units.
(See a Basic Plumbing Diagram).
• If the distance between the two units is too great, not only the cable won't be able to
reach, but the water temperature may also become unstable because of the difference
in pipe length between the two units.
KIT# : SP20892
WARNING
Read this instruction carefully and failure to follow
these instructions exactly could result in a fire or
explosion, serious bodily injury and/or property
damage. Installation must be performed by a qualified
plumber, a licensed gas fitter, or a professional
technician in accordance with all local codes.
Improper installation and operation by an unqualified
person will void the warranty.
CAUTION
Electrical Shock Hazard
Do not turn power on until electrical wiring is
finished. Disconnect power before servicing.
Failure to do so may result in death or serious injury
from electrical shock.
Shape
Connector on PCB detail
Do not connect
Connection
anything here
Gas Supply
Cold Water Supply
Hot Water Supply
3. Installation
1) Basic Plumbing Diagram
Distance at center : 18~36 in. (489~916 mm)
Union
Pressure
Relief Valve
Shutoff
Valve
Hot Water
Cold Water
2) Installing
[NOTE]
All units must be set to the same settings listed below before using in the Cascade
System.
• Set "on" at [12:Cn] in installer mode (Refer to the next page on the Panel Setting)
• Current Clock Setting.
• Recirculation Timer Setting, if recirculation is used. (Please refer to pages 62-63 in the
U&C Manual)
Q'ty
① Turn off both gas and water supply to the water heater. And, turn the power off.
② Use a hand screwdriver to remove the 4 screws for the front cover. See Figure 1 for
illustration of the front cover on the unit.
2 sets
1
Figure 1
③ Pass the Cascade System Cord through the wiring throughway at the bottom of the
both units. See Figure 2 for illustration of the throughway location at the bottom of the
units.
④ Plug the wire connector into the 'Main PCB' connector inside both each other units.
See Figure 3 for illustration of the Main PCB connector inside units.
Connection
Figure 3
⑤ Set the proper setting on the control panel to activate the Cascade system. For more
detailed configuring, refer to next page on "Setting on the control panel."
⑥ Close the front cover with secure 4 screws.
Distance on Sides
2~18 in. (50~457 mm)
* Insulate the hot water piping to prevent heat
loss. Insulate and apply hea ng materials to
the cold water supply piping to prevent heat
loss and freezing of pipes when exposed to
excessively cold temperature
Figure 1
Cascade System Cable
Size the piping to allow for the
maximum flow rate of the units
Leave enough clearance around the plumbing
to apply insula on. It will be necessary to add
bends to the piping to ensure that this
clearance is available
Figure 2
The backflow preventer is put
up before it diverges
Wring Throughway