Bosch C1210ES Specifications download pdf (Page 43)

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6 720 644 887 (2014/11)C 1210 ES/ESC

8.6 Hot water temperature fluctuates at tap

1. Hot water is very hot out of the water heater, requiring mixing in cold

water in order to attain a usable hot water temperature. The addition

of too much cold will overpower hot water flow from the tankless

water heater.

If this slows the flow through the tankless water heater below its

activation point, it will shut off the burners. The end result is nothing

but cold water coming out of the outlet. Consult www.bosch-

climate.us for a detailed service bulletin on overcoming temperature

fluctuations.

2. Unbalanced pressure in water lines. Any restriction in the water

heater, such as a clogged inlet filter screen, can result in unequal

pressures between the cold and hot water lines. In such cases, when

mixing in the higher pressure cold water at the tap, the lower

pressure hot water can be overpowered. This will shut down the

burners because the hot water flow rate fell below the minimum flow

rate required for activation. Verify inlet filter screen is clean and clear

of debris. See chapter7.1, page 36 for inlet filter cleaning

instructions.

3. Heater deactivated by temperature balancing valves. If the outlet

water temperature is set too high, the heater can produce

temperatures that are too hot. A temperature balance shower valve

will automatically mix in cold water to reduce the hot water

temperature. In the event of any temperature instability at a fixture

using a temperature balancing valve, refer to the valve manufacturer

for instructions on internal adjustment setting. An adjustment should

be made to minimize the amount of cold water the valve is adding.

Additionally, the temperature setting on the heater can be lowered to

prevent the temperature balance valve from mixing in too much cold.

4. Inlet water pressure is erratic due to fluctuating supply water

pressure. For installation on a private well system with the use of a

pressure tank, the lowest pressure range setting recommended is 40

- 60 psi (2.75 - 4.15 bar). Consult your installer or local plumber for

effective ways to maintain constant water pressure to the appliance

when on a well system.

8.7 Noisy burner/heater during operation

1. Sealed combustion leak. Make sure combustion cover is securely

fastened. Ensure the exhaust vent adaptor is properly sealed with

supplied gasket. Leaky seals create improper combustion resulting

in noise.

2. Improper venting. Venting that is unsealed, the wrong material, too

big in diameter or too long in run will result in unstable burner flames

and noise. Ensure venting is in accordance with specifications in

chapter4.3, page 11.

3. Lack of adequate combustion air. Drawing combustion air from a

room area of inadequate size will result in unstable burner flames and

noise. Improper piping of combustion air to the outside or

insufficient space will result in unstable burner flames and noise.

Ensure adequate combustion air is provided from the unit in

accordance with specifications in Section4.4, page 23 Combustion

Air Requirements.

4. Cross contamination. Ensure that intake and exhaust terminations

maintain required clearances as stated in chapter 4.3, page 11.

Cross contamination between intake and exhaust may cause

unstable burner flames and noise.

5. Lack of gas pressure. Inadequate gas pressure will cause the fuel-to-

air mixture (CO

) to be out of adjustment. This will result in unstable

burner flames and noise. Ensure gas pressure is in accordance with

specifications in Section 4.14, page 32 Measuring Gas Pressure. A

gas pressure reading is needed to proceed further. Contact your

original installer or a local certified gas technician to obtain this

reading.

6. Verify proper CO

readings per chapter 7.5, page 38. CO

adjustments must be done by a certified gas technician with a

calibrated combustion gas analyzer.

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Bosch C1210ES Specifications Page 43

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