Installation instructions
3.12 Measuring gas pressure
Confirm gas pressure upon installation.
Connecting manometer
BShut off gas supply at installer supplied shutoff valve for this water heater.
BRemove front cover and locate inlet gas pressure measuring point (see Fig. 34).
BLoosen screw inside left test point fitting (do not remove) and connect manometer tube to test point. Remove screw completely if correct size tapping is available.
Static Pressure Test
BTurn gas supply back on.
BRecord static gas pressure reading in table 15.
Operating Pressure Test
BPress ON/OFF button to turn off the appliance.
BPress and hold "Program" (P) button and press ON/ OFF button to turn appliance ON.
Fig. 33
B As soon as '188' is displayed, release "Program"
, button and the display should read P2.
BPress 
or 
until P1 appears.
Note: While in this mode the appliance will run constantly at maximum power and allow maximum water flow.
For inlet gas pressure adjustment consider the following table:
Gas type | NG | LPG |
|
|
|
| 3.5” WC | 8” WC |
|
|
|
Table 14 Minimum inlet gas pressure under full operation
BTurn on high volume of hot water flow (at least 6 gpm) and heater will ignite. If heater display reverts to
P2, open more hot water fixtures to allow sufficient
flow. Press 
until P1 reappears on display.
BOperate all other gas appliances on the same gas piping system at maximum output.
B Record lowest operating gas pressure reading in table 15.
Gas pressures lower than 3.5" W.C. for Natural Gas or 8" W.C. for LPG will result in insufficient degree rise to the hot water being used, reduced hot water volume, possible error code faults and must be corrected. See Gas Connections, chapter 3.8, page 22.
Fig. 34 Gas pressure test port (left tapping)
Static Gas Pressure Reading (see Chapter 3.12) enter here: ___________________ Date: ___________
Operating Gas Pressure Reading (see Chapter 3.12) enter here: ___________________ Date: ___________
Table 15
6 720 608 542 | 27 |