Sp5 Universal Heater; Sp5 And Sp6 Internal Heater; Sp6 Universal Heater - Rinnai Brivis StarPro SP623UN Installation Manual

6.2.2 SP5 Universal Heater

a. Remove the lid (four screws).
b. Disconnect from heater PCB all looms connected to components on the heat exchanger cabinet side.
c. Disconnect the pressure switch hose.
d. Remove the screws fastening the fan cabinet tabs to the heat exchanger cabinet. These are located at the top
of the heat exchanger cabinet on the heater split line.
e. Tilt the fan cabinet back and slide away from the heater cabinet while at the same time removing the flue pipe
from the combustion fan.
Note:
• Prior to splitting the SP5 and SP6 you may remove the flue pipe by removing the flue terminal (SP5) and sliding the pipe from the
combustion fan.
• Protect the exposed looms and tabs from damage while the heater is split.
• Ensure when reassembling the heater that all items are correctly installed and connected.
f. To assemble the heater, follow the procedure in the reverse order ensuring that:
• the two locating brackets at the base of the cabinets are fully engaged, and
• the flue pipe is pushed fully onto the combustion fan assembly.

6.2.3 SP5 and SP6 Internal Heater

a. Remove the heater's roof after removing the 4 roof screws.
b. Disconnect the speed sensor loom from the control board and remove it from the heat exchanger cabinet.
c. Remove the main fan motor and speed sensor loom access plate located on top of the fan cabinet
compartment by removing the single screw.
d. Remove the 2 screws fastening the fan cabinet tabs to the heat exchanger cabinet. These are located at the
top of the fan cabinet on the heater's split line.
e. Pivot the fan cabinet upwards high enough to dislodge the lower locking tabs fixed to the fan cabinet near the
base.
f. The heater is now split in two.
g. Protect the exposed looms and tabs from damage while the heater is split in two parts.
h. Once ready, reassemble in reverse order.
Note: Ensure when reassembling the heater that everything is put back and connected correctly.

6.2.4 SP6 Universal Heater

The flue pipe is captive within the cabinet, retained by an 'O-Ring Groove' on the flue pipe and a 'Clearance Plate'.
To split the cabinet the flue pipe must be removed from the cabinet "Diagram 15. SP6U flue removal" on page 23.
To remove the flue pipe from the cabinet do the following:
a. Remove the lid (four screws).
b. Remove the four screws securing the 'Clearance Plate' to the cabinet, refer Diagram 15.
c. Remove the 'Clearance Plate' from the flue pipe.
d. Remove the flue from the combustion fan and the heater cabinet.
e. Disconnect from heater PCB all looms connected to components on the heat exchanger cabinet side.
f. Disconnect the pressure switch hose.
g. Remove the screws fastening the fan cabinet tabs to the heat exchanger cabinet. These are located at the top
of the heat exchanger cabinet on the heater split line.
h. Tilt the fan cabinet back and slide away from the heater cabinet while at the same time removing the flue pipe
from the combustion fan.
Rinnai 22 Ducted Gas Heater IM