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4.14 Measuring Gas Pressure; Electrical Connections; Electrical Power Supply - Bosch 830 ES Manual

Temperature modulated with electronic ignition suitable for heating potable water and space heating (intended for variable flow applications)
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4.14 Measuring gas pressure

Confirm gas pressure upon installation.
Connecting manometer
▶ Shut off gas supply at installer supplied shutoff valve for this water
▶ Remove front cover and locate inlet gas pressure test port (see
▶ Loosen screw inside left test point fitting (do not remove) and connect
manometer tube to test point.
Static Pressure Test
▶ Turn gas supply back on.
▶ Record static gas pressure reading in table 32.
Operating Pressure Test
▶ Press ON/OFF button
into ON.
▶ Press and hold simultaneously buttons
seconds, until display reads P2.
Fig. 40
▶ Press
to enter P2 adjustment. The current setting will appear on
the display (factory default).
▶ Press
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
3.5" WC
Table 31 Minimum inlet gas pressure under full operation

Electrical connections


Electrical power supply

▶ For safety reasons, disconnect the power supply
cord to the heater before any service or testing is
▶ This heater must be electrically grounded in
accordance with the most recent edition of the
National Electrical Code. NFPA 70. In Canada, all
electrical wiring to the heater must be in
accordance with local codes and the Canadian
Electrical Code, CSA C22.1 Part 1. Do not rely on
the gas or water piping to ground the metal parts of
the heater.
830 ES
for 3
8" WC
▶ Operate all other gas appliances (except heater) on same gas piping
system at maximum output.
▶ Turn on high volume of hot water flow (at least 6 gpm) and burner will
light. If heater display reverts to P2, open more hot water fixtures to
allow sufficient flow. Press
▶ Record lowest operating gas pressure reading in table 32.
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 4.9, page 26.
P1 fan speed:
Factory default: NG: 48, LP: 40
Lowering P1 fan speed reduces the maximum BTU input.
As a temporary measure if the gas pressure in P1 is below specification,
lower P1 fan speed incrementally until minimum inlet gas pressure
reaches specified range (table 31). After upgrading gas line, reset
appliance to P1 factory default setting (NG: 48, LP: 40) or setting from
Section 4.3.8.
Fig. 41 Gas pressure test port (left tapping)
Static Gas Pressure Reading (see chapter 4.14)
enter here: ___________________ Date: ___________
Operating Gas Pressure Reading (see chapter 4.14)
enter here: ___________________ Date: ___________
Table 32
The water heater requires an electrical power supply from a 120VAC /
60Hz properly rated receptacle and must be properly grounded.
The heater is wired as shown in the wiring diagram (chapter 10, Fig.67).
Electrical connections | 31
until P1 reappears on the display.
6 720 644 936 (2013/01)



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