Lochinvar TTB410 User Instructions

The TTB range

High Efficiency Gas Fired Condensing Boiler

User Instructions

Models:

TTB410

TTB580

INS0043 Issue No 1 | April 2013

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1.0 DISPLAY CODES .......................................................................................................................................................................................................................... 4

1.1 DOUBLE NUMBERS ............................................................................................................................................................................................................. 4

1.2 DIAGNOSTIC CODES ........................................................................................................................................................................................................... 4

1.3 ERROR CODES .................................................................................................................................................................................................................... 4

2.0 USER GUIDE ................................................................................................................................................................................................................................. 5

2.1 GENERAL REQUIREMENTS ................................................................................................................................................................................................ 5

2.2 PROCEDURE FOR LIGHTING ............................................................................................................................................................................................. 5

2.3 PROCEDURE FOR SHUTTING DOWN ............................................................................................................................................................................... 5

2.4 TEMPERATURE ADJUSTMENT PROCEDURE .................................................................................................................................................................. 5

2.5 MAINTENANCE ..................................................................................................................................................................................................................... 5

2.6 FROST PROTECTION .......................................................................................................................................................................................................... 6

2.7 AIR SUPPLY .......................................................................................................................................................................................................................... 6

2.8 CONDENSATE DRAIN .......................................................................................................................................................................................................... 6

3.0 WARRANTY .................................................................................................................................................................................................................................. 6

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1.0 DISPLAY CODES

The Lochinvar TTB has two three digit LED display on the front panel; these displays are used for setting the

desired stored water temperature and for aiding diagnosis if the unit is not firing.

1.1 DOUBLE NUMBERS

If two numbers (e.g. 80) are displayed on the upper display, the water heater is operating normally and the value

displayed is the setpoint of the water heater. If two numbers (e.g. 80) are displayed on the lower display, the lower

burner has a demand present and the value displayed is the setpoint for the burner. If the green LED below either

display is illuminated, this signifies that the relevant burner is active.

1.2 DIAGNOSTIC CODES

When a code is permanently displayed (i.e. not flashing), on the upper or lower display, the relevant burner is

waiting for a specific condition before beginning the firing sequence. The following table gives a list of diagnostic

codes, descriptions of the fault and solutions.

Code

Fault

Solution

A1

System pressure too low

Check system pressure

A2

Outlet temperature too high

Wait for outlet temperature to drop

A3

External sensor temperature too high

Wait for temperature to drop

A5

Anti-cycling time

Wait for time period to expire

A6

Fan speed too high

Wait for fan speed to drop

A7

Fan speed too low

Wait for fan speed to increase

A8

Water flow through heater too low

Wait for water flow to increase

C1

Flame simulation

Wait for burner to extinguish

C3

High limit thermostat activated

Wait for water temperature to drop

E6

Heater running in safe operation mode

Contact qualified service personnel

TABLE 1.1 DIAGNOSTIC CODES

1.3 ERROR CODES

When a code is flashing in the upper or lower LED display, the relevant burner has locked out and will need to be

reset by depressing the button on the water heater control panel. The following table gives a list of error codes,

descriptions of the causes. If an error code does not reset or occurs again immediately, a competent person

should be called to investigate and rectify the fault.

Code

Fault

F0

Short circuit in ionisation circuit

F1

Blocked condensate drain

F2

High temperature limit exceeded

F4

Wrong fan speed

F5

No flame after 5 ignition attempts

F6

Flame lost (4 times) during running

E0

Outlet temperature sensor shorted or interrupted

E2

Inlet temperature sensor shorted or interrupted

E5

Flow temperature sensor shorted or interrupted

E6

Low water flow (A8) has occurred 4 times

PP

Parameters programmed into controller

PE

Incorrect parameters programmed into controller

nc

Heater control has failed

NC

Cascade communication has failed

H1

Gas valve wiring interrupted

TABLE 1.2 ERROR CODES

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2.0 USER GUIDE

2.1 GENERAL REQUIREMENTS

 This equipment must be installed by a competent person, registered with a H.S.E. approved

body. All installations must conform to the relevant Gas Safety and Building regulations. Health

& safety requirements must also be taken into account when installing any equipment.

 A competent person must also undertake any alterations that require the gas train or flue system

to be broken.

 Any interference with a sealed component is forbidden.

 Failure to comply with the above may lead to prosecution.

 Incorrect use may result in injury and will also invalidate the warranty

2.2 PROCEDURE FOR LIGHTING

1. Ensure that the gas inlet appliance isolating valve is in the “off” position.

2. Press the power rocker switch, positioned on the front of the appliance next to the control thermostat, to

bring the equipment on.

3. The combustion fans should ramp up to full speed to purge the combustion chamber and then drop back

to half rate in order to light. As the gas inlet appliance isolating valve is closed, the controls should go to

a flame failure condition after four ignition attempts.

4. If the above occurs correctly, open the gas inlet appliance isolating valve and reset the unit by

depressing the button on both upper and lower control panels.

5. The combustion fans will repeat the pre-purge procedure and attempt to light. Once a flame is

established, the green ‘Burner On’ lamp, located below the digital display on the control panel, will

illuminate for each burner.

2.3 PROCEDURE FOR SHUTTING DOWN

To take the appliance out of service, the control thumbwheel on the upper display should be set to its minimum

value. If the appliance is operating when the thumbwheel is turned, wait for a period of 60 seconds to allow the

appliance to complete its combustion cycle. Once the appliance is in its standby mode, the main power rocker

switch can be turned to the off position. If the appliance in to be shut down for a long period of time, the gas

supply should be isolated at the gas inlet appliance isolating valve.

2.4 TEMPERATURE ADJUSTMENT PROCEDURE

The operating temperature of the boiler can be adjusted using the thumbwheel on the upper display of the

appliance control panel. The LED display on the panel will change to show the selected set point temperature.

2.5 MAINTENANCE

Service intervals should be determined during the first months of operation. Details of this procedure can be found

in the Installation Commissioning and Maintenance Instructions for the appliance. If these instructions are not

available, a copy should be obtained from Lochinvar’s website

www.lochinvar.ltd.uk.

Even if the maintenance schedule for the storage vessel is determined to be less than annually, it is

important that all controls and safety features are checked for correct operation on an annual basis.

A competent person should check and ensure that the flue system, ventilation to the plant room, safety valve,

drain, pressure gauge etc. are in a serviceable and working condition and still comply with the relevant standards

and codes of practice, as detailed in the Installation, Commissioning and Maintenance Instructions.

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2.6 FROST PROTECTION

If the temperature of the water at the inlet side of the heat exchanger drops below 5°C, the primary pump will be

energised. If the temperature of the water at the inlet side of the heat exchanger drops further and reaches 3°C

the burner will fire. If the temperature rises above 10°C the burner and the pump will shut down.

2.7 AIR SUPPLY

 When installed as a conventionally flued appliance, the room in which the appliance is installed must be

ventilated.

 Blocking these air vents may lead to severe injury, serious property damage or death.

 The area in which the appliance is installed should not be used to store any other materials.

2.8 CONDENSATE DRAIN

The condensate drain must not be blocked or modified in any way. If fitted with a neutralisation kit, this must be

replaced at least every 12 months to ensure correct operation. Due to its design, no further maintenance should

be necessary.

3.0 WARRANTY

Full warranty terms and conditions are available at

www.lochinvar.ltd.uk

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NOTES

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Lochinvar TTB410 User Instructions

Lochinvar TTB410 User Instructions

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