Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
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Burner Gas Pressure Adjustment
Adjustment of the burner pressure will not overcome problems associated
with poor supply pressure or incorrect gas supply pipe sizing.
Minimum Burner Gas Pressure
1. Remove the front panel from the water heater.
2. Remove burner test point screw and fit manometer.
3. Connect a controller (if one is not present) and turn on. NOTE: Isolate power while
connecting the controller.
4. Open a hot tap slowly, to achieve the minimum flow rate at which the burners will ignite.
5. Press and hold the adjuster button (“LH” is displayed on controller display)
NOTE: The adjuster button must be held down continuously through steps 5 and 6.
6. Press the MIN button and observe the reading on the manometer.
NOTE: While the MIN button is pressed, the gas pressure will at first increase then
decrease, cycling between an upper gas pressure limit (39 on controller display) and a
lower gas pressure limit (01 on controller display).
7. Release the MIN and adjuster buttons when the minimum test point pressure shown on
the manometer agrees with the rating label.
NOTE: If the burners extinguish or an error code starts to flash on the controller display
during this procedure, release the MIN and adjuster buttons, close the hot tap, clear the
error code, turn on the water heater and recommence the procedure from step 3. To reset
an error code, follow the procedure on page 28.
Maximum Burner Gas Pressure
8. Open the hot tap fully to achieve maximum flow rate.
9. Press and hold the adjuster button (“LH” is displayed on controller display).
NOTE: The adjuster button must be held down continuously through steps 9 and 10.
10. Press the MAX button and observe the reading on the manometer.
NOTE: While the MAX button is pressed, the gas pressure will at first increase then
decrease, cycling between an upper gas pressure limit (39 on controller display) and a
lower gas pressure limit (01 on controller display).
11. Release the MAX and adjuster buttons when the maximum test point pressure shown
on the manometer agrees with the rating label.
12. Turn the hot tap off, remove manometer and refit the burner test point screw ensuring
the seal is gas tight.
13. Disconnect the controller if connected in step 3. Note: Isolate power while
disconnecting the controller.
14. Refit the front panel to the water heater.