Bosch C1210ES Specifications download pdf (Page 32)

32 | Electrical connections

C 1210 ES/ESC6 720 644 887 (2014/11)

4.14 Measuring gas pressure

Confirm gas pressure upon installation.

Connecting manometer

▶ Shut off gas supply at installer supplied shutoff valve for this water

heater.

▶ Remove front cover and locate inlet gas pressure test port (see

Fig.43).

▶ 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 31.

Operating Pressure Test

▶ Press ON/OFF button into ON.

▶ Press and hold simultaneously buttons or and for 3

seconds, until display reads P2.

Fig. 42

▶ Press to enter P2 adjustment. The current setting will appear on

the display (factory default).

▶ Press 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:

▶ 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 until P1 reappears on the display.

▶ Record lowest operating gas pressure reading in table 31.

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 4.8, page 25.

P1 fan speed:

Factory default: NG: 52, LP: 53

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 30). After upgrading gas line, reset

appliance to P1 factory default setting (NG: 52, LP: 53) or setting from

Section 4.3.7.

Fig. 43 Gas pressure test port (left tapping)

5 Electrical connections

5.1 Electrical power supply

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.71).

Fig. 44 Connecting power supply cord

[1] Power cord length: 3ft.

Gas type NG LPG

3.5” WC 8” WC

Table 30 Minimum inlet gas pressure under full operation

Static Gas Pressure Reading (see chapter 4.14)

enter here: ___________________ Date: ___________

Operating Gas Pressure Reading (see chapter 4.14)

enter here: ___________________ Date: ___________

Table 31

For safety reasons, disconnect the power supply cord

to the heater before any service or testing is

performed.

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.

6720608643-15.1AL

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