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Installation instructions
21
3.8 Measuring gas pressure
Confirm proper gas pressure upon installation.
Connecting Manometer
B Shut off gas supply at installer supplied shutoff valve.
B Remove front cover and locate inlet gas pressure
measuring point (see Fig. 24).
B Loosen screw inside left test point fitting (do not
remove) and connect manometer tube to test point.
Remove screw completely if correct size adapter is
available.
Static Pressure Test
B Turn gas supply back on.
B Operate all other gas appliances (except heater) on
same gas piping system at maximum output.
B Record static gas pressure reading in table 7.
Operating Pressure Test
B ON/OFF switch in position OFF (0).
B Press and hold "Program" (P) button and turn ON/
OFF switch to ON position.
Fig. 23
B As soon as '188' is displayed, release "Program"
, button and the display should read P2.
B Press until P1 appears.
Note: While in this mode the appliance will run
constantly at maximum power and allow maximum water
flow.
B Turn on a high volume of hot water (at least 4 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.
B Record lowest operating gas pressure reading in
table 7.
Gas pressures lower than 5" W.C. for Natural Gas or
11" W.C. for LPG will result in insufficient degree rise
to the hot water being used, possible error code faults
and must be corrected. See Gas Connections,
chapter 3.7.
Fig. 24 Gas pressure measuring (left tapping)
HIGH ALTITUDE OPERATION
Static Gas Pressure Reading (see Chapter 3.8)
enter here: ___________________ Date: ___________
Operating Gas Pressure Reading (see Chapter 3.8)
enter here: ___________________ Date: ___________
Table 7
Altitude Natural
Gas:
Liquid
Propane:
0 - 4,000 ft
(0 - 1,219 m)
no
modification
no
modification
For operation at
elevations
above 2,000 ft
(610 m) the
equipment
ratings shall be
reduced at the
rate of 4% for
each 1,000 ft
(305 m) above
sea level
4,000 ft - 7,000 ft
(1,219 m - 2,134 m)
CO
2
adjustment with flue
gas analyzer required See
section
5.4 for instructions.
Above 7,000 ft
(above 2,134 m)
Not approved
Table 8