Rheem 874826NF, 876826NF, 874T26NF, 876T26NF Installation Instructions Manual
INSTALLATION INSTRUCTIONS
RHEEM FLUE TERMINAL DIVERTER
WITH HEAT SHIELD (PN 299287)
RHEEM EXTENDED FLUE TERMINAL DIVERTER
WITH HEAT SHIELD (PN 299285)
This instruction details the installation of the Rheem Flue Terminal Diverter with Heat Shield (PN 299287) and
the Rheem Extended Flue Terminal Diverter with Heat Shield (PN 299285) to the Rheem Electronic
Continuous Flow Gas water heater models noted below (refer to the rating plate for model number):
874826NF, 874T26NF (26L/min 60°C, Natural Gas, Frost Protected)
876826NF, 876T26NF (26L/min 50°C, Natural Gas, Frost Protected)
Warning: Fitting of a Flue Terminal Diverter or Extended Flue T erminal Div erter to Rheem models oth er
than those identified above can result in a pote ntial l y unsafe condition.
SETTING BURNER GAS PRESSURE OF THE WATER HEATER
It is necessary to check the burner gas press ure at bot h the m inim um and m aximum oper ational sett ings. To
check and if necessary adjust the operational gas pressures, the electrical supply to the water heater must be
switched on, the burners ignited and hot water must be flowing from a hot tap.
Warning: The removal of the front panel will expose 240 volt wiring. Take care not to touch wiring terminals.
Note: If an 874 series model is installed as an in-ser i e s gas booster for a so lar w ater heater, then durin g t hi s
procedure the temperature of the water entering the in-series gas booster must be below 58°C. Otherwise the
gas burners will not ignite and the operational gas pressures cannot be measured.
1. Close any hot taps and ensure the burners are not operating.
2. Turn off the controll er(s), if one is f itted, by press ing the on / off ( ) button and switch off the elec trical
supply at the power outlet to the water heater.
3. Remove the top and bottom cover s trips to gain ac ces s to the f ront cover scr ews by pressi ng on the t wo
ridged finger points and gently pulling forward.
4. Remove the screws holding the front panel to the jacket.
5. Gently disengage the f ront panel and pul l forward to rem ove
from the water heater.
6. Locate the burner pressure test point on the main burner
manifold
Remove the test p oint screw and washer from the t est
point orifice.
Connect the manometer.
7. Switch on the electrical supply at the power outlet to the water
heater and turn on a controller, if one is fitted, by pressing the
on / off ( ) button.
8. The priority light and the on / off operating light will both glow.
9. Open the gas isolation valve f ully at the gas inlet to th e water
heater, if not already open.
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Minimum Test Point Gas Pressure
10. Refer to the rating label on the water heater for the minimum test point gas pressure.
11. Open a hot tap slowly until the burners ignite.
12. Press and hold dow n the MIN but ton and o bserve the r ead ing on
the manometer.
“1L” is shown on the LED display.
13. Release the MIN button.
14. If the manometer reading observed in step 12 agrees with the
rating label, no further adjustment is required.
15. To adjust, press and hold down the adjuster button.
“LH” is shown on the controller display.
Note: The adjuster button must be held down continuously through steps 15 to
17.
16. Press and hold down the MIN button and observe the reading on the
manometer.
The manometer reading will change as the test point gas pressure adjusts.
Note: W hile the MIN butto n is pressed, the gas pres sure will at first increas e
then decrease, cycling bet ween an upper gas pressu re limit (59 on the LED
display) and a lower gas pressure limit (01 on the LED display).
17. Release the MIN button when the read ing on the m anom eter agrees w ith the
rating label.
18. Release the adjuster button.
Notes:
• If the burners extinguish and an error code 11 or 12 starts to flash on the LED display:
release the MIN and adjuster buttons
close the hot tap
clear the error code (refer to Owner’s Guide and Installation Instructions supplied with the water
heater)
recommence the procedure from Step 11.
• If the adjuster button is releas ed bef or e Step 17, clear any error code (if displayed) and recommence the
procedure from Step 11.
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