Hamworthy PUREWELL VariHeat he, Инструкция по установке, пусконаладке и обслуживанию

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HAMWORTHY HEATING LTD
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PUREWELL VariHeat he 500001155/F
8.0 CONTROLS OPERATION
Overview
The Purewell Vari Heat he control system is a self contained, microprocessor based package (BIC930), controlling
and monitoring all safety and functional aspects of the boiler performance and it’s integration with external system
controls.
Access to boiler performance information is via the DU930 display screen consisting of 2 x 16 character backlit
LCD unit and 6 buttons for operation and setting of the boiler.
The system is compatible with BMS (or other) external controls via an enable or 0~10V DC input signal. The op-
tional outside and mixed flow sensors are supplied by Hamworthy Heating Ltd to ensure safe and reliable opera-
tion.
The system provides as standard 3 volt free contacts for external fault indication - Normal Run, High Temperature
Overheat & General Fault.
The BIC930 control system allows the connection of multiple boilers on an RS485 bus connection (twisted pair) to
enable Cascade control of up to 8 multiple boilers by selection of Master/Slave configuration.
Note: To ensure safe and reliable operation, all wiring between sensors & master/slave boilers must be separated
from mains voltage wiring.
Figure 8.0 - Boiler fascia panel
General Description of Controls Functionality
8.1 Starting Up
During the first 3 seconds of any start-up, the internal micro-processor carries out a self-test to ensure correct
operation, prior to the fan commencing the Pre-Purge period at the defined speed. If a test fails, the control will go
to lockout.
If the flame signal is lost during any ‘Demand’ period, the gas valve will close immediately and if the flame cannot
be re-established after one attempt to relight, the boiler will go to lockout.
In the case of a lockout caused by ignition failure or overheat temperature, the fan will continue to run for a period
after the lockout has been instigated.
Ignition will start after the Post Purge time. Once the ignition speed has been achieved, the Hot Surface Igniter
(HSi) will be powered up to ensure that it is up to temperature when the gas valve is opened.
8.2 Stand-By
In Stand-by mode the boiler can still be programmed either through the display or PC tool software