Bosch C 1210 ESC Referenzhandbuch

Technical Service Bulletin:

Descaling the Heat Exchanger

Models: C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES

Introduction

Periodic descaling may be necessary in areas where the water

supply is highly mineralized. Scale build up in the heat

exchanger may result in reduced ﬂow rates, error codes and boil-

ing sounds in the heat exchanger.

Tools needed:

Various plumbing wrenches

5 gallon bucket for descaling solution

Small circulator or pump

3 Hoses for circulating

Filter for descaling solution

Descaling procedure

1. Clear error code (if displayed) by pressing the reset button.

2. Press On/Off button to "Off".

3. Disconnect electrical supply from the water heater.

4. Shut off the water supply to the water heater using (installer

supplied) isolation or shutoff valves.

5. Open hot water taps to drain and relieve pressure from the

plumbing system.

6. Drain water by disconnecting the inlet and outlet water connec-

tions from the heater.

7. Connect a hose (A) from the outlet of the circulating pump

(installer supplied) to the inlet water ﬁtting on the water heater.

(Fig. 1)

8. Connect another hose (B) to the water outlet fitting on the water

heater. Route the other end of this hose into a descaling reser-

voior or bucket. (Fig. 1)

9. Using a 3rd hose (C) from the descaling reservoir, connect to the

inlet side of the circulator/pump. Install a filter on the end of

the hose in the descaling reservoir. (Fig. 1)

Figure 1

10. Make sure all connections are 'hand tight'.

11. Fill reservoir/bucket with descaling solution so both hoses inside

are submersed. We recommend straight white vinegar. If using

a commercial descalant, refer to manufacturer‘s instructions for

proper dilution ratio with water.

12. Operate the circulating pump.

13. Make sure there are no leaks and the solution is ﬂowing from the

descaling reservoir, through the heater and returning to the

reservoir.

Data subject to change without notice | Printed in the USA | BTC 740002309 B | 06.2011 Bosch Thermotechnology Corp.

Technical Service Bulletin

18 | Descaling the Heat Exchanger

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-800-283-3787

Fax: 1-603-584-1687

www.bosch-climate.us

14. Run solution through the heater until the solution returning to

the descaling reservoir/bucket comes out clear. Changing to a

fresh solution may be necessary during this process.

15. Properly discard of dirty descaling solution. Disconnect lines A

and C (Fig. 1). Reconnect cold water supply to the water heater.

16. Open cold supply shutoff valve to ﬂush water heater with clean

water. Allow enough water to ﬂow through the heater to

properly ﬂush it. Filling the 5 gallon descaling bucket once

should be sufﬁcient.

17. Close cold water shutoff valve and disconnect line B (Fig. 1).

Reconnect hot water line to the water heater.

18. Plug in power cord and press On/Off button to "On".

19. Open water shutoff valves, and return water heater to service.

Water Quality

Water quality can have an impact on appliance longevity and may

void the manufacturer’s warranty.

For water analysis data, call your local water department. If on a

well, have the well water analyzed periodically. If water quality

exceeds one or more of the values speciﬁed in Figure 2, Bosch

recommends consulting a local plumber about installing a water

conditioner or softener.

 If the tankless water heater is operating in applications where

the outlet temperature exceeds 140°F, a water softening system

is strongly recommended. The higher the set temperature is on

the appliance, the greater the risk for scale/mineral deposits.

Damage from scale/mineral deposits is not covered under

warranty. Refer to manufacturer’s limited warranty.

Figure 2

Description Max. Levels

pH pH 6.5 - 8.5

TDS (total Dissolved

Solids) mg/l or ppm 500

Total hardness gpg or ppm 100

(6 gpg)

Aluminum mg/l or ppm 2.0

Chlorides mg/l or ppm 250

Copper mg/l or ppm 1.0

Iron mg/l or ppm 0.3

Manganese mg/l or ppm 0.05

Zinc mg/l or ppm 5.0

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