Rheem 874 Owner's Manual And Installation Instructions page 58

EZ-LINK CABLE CONNECTION
The references in steps 14 to 17 are to the
connect the Ez-Link cable to the water heaters:
Close any hot taps and ensure the burners on both water heaters are not operating.
10.
Switch off the electrical supply at the power outlet to each water heater.
11.
12. Remove the screws holding the front panel to the jacket on each water heater.
13. Gently disengage the front panel and pull forward to remove from each water heater.
14. Connect one end of the EZ-Link cable to the first water heater.
Draw the cable through the cable grommet on the underside of the water heater.

Plug the cable into the four pin connector located immediately below the MIN button, toward the

upper right hand corner of the Control Board (refer to the
The connector will only fit one way.
Press until the connector snaps into place.

Secure the EZ-Link cable with the clamp and screw provided to the top right of the Control Board

(refer to the Control Board
Switch DIP SWITCH 4 to the on (up) position on the first water heater (refer to the
15.
diagram). Note: This dip switch is on the DIP 1 set of dip switches.
16. Connect the other end of the EZ-Link cable to the second water heater.
Draw the cable through the cable grommet on the underside of the water heater.

Plug the cable into the four pin connector located immediately below the MIN button, toward the

upper right hand corner of the Control Board (refer to the
The connector will only fit one way.
Press until the connector snaps into place.

Secure the EZ-Link cable with the clamp and screw provided to the top right of the Control Board

(refer to the Control Board
17. Switch DIP SWITCH 4 to the on (up) position on the second water heater (refer to the
diagram). Note: This dip switch is on the DIP 1 set of dip switches.
18. Refit the front panel and screws to each water heater.
19. Check the main gas isolation valve and the isolation valves at the gas inlet to each water heater are fully
open.
Switch on the electrical supply at the power outlet to the water heater. If fitted, turn on the controller by
20.
pressing the on / off button. The light in the on / off button and the priority light (standard controller) or
ACTIVE light (Deluxe controller) will both glow.
Open a hot tap.
21.
The first water heater and depending upon the flow from the hot tap, the second water heater will
operate automatically.
22. Increase the hot water flow by turning on an additional hot tap(s).
Check to ensure the flow from each connected hot tap is sufficient to operate both water heaters.
The minimum operating flow rate for each water heater is 3.0 litres per minute.
23. Turn off the hot taps.
"Commissioning"
Refer to
„Control Board with Ez-Link Connection‟
diagram).
diagram)
on page 67 for details on completing the installation.
Control Board
Control Board
58
diagram on page 59. To
diagram).
Control Board
diagram).
Control Board