Brivis Service Manual CC3 Gas Ducted Heater Compact Classic

Transcription

1 Brivis Service Manual CC3 Gas Ducted Heater Compact Classic Service shall be carried out only by Authorised Personnel. This Service Manual must NOT be left with the Owner, or distributed to other persons not permitted to obtain this information by Brivis Climate Systems. Service Manual 407 Compact Classic Series 06/11/13 1

2 Issue Date Description 1 Sept 13 Release of the CC3-15,20,25,30 NG CC3-20XA, 25XA, 30XA NG Service Manual 407 Compact Classic Series 06/11/13 2

3 1. Table of Contents 1. Table of Contents SCOPE Brivis Classic CC3 Model Gas Ducted Heater Heater Operation Circuit Diagram Wiring Colour Code Motor Wiring Diagrams Combustion Fan Resistance CC3 Gas Ducted Unit Components Gas Valve Operation Burner Operation Operation Overview HCDSI24-1 Control Board Spark Igniter Operation Flame Sensor Operation Combustion Fan Operation Pressure Switch Operation Main Fan Assembly Operation Operation Flow Charts Heater Shut down Flow Chart INSTALLATION & COMMISSIONING TROUBLESHOOTING LED FLASH CODES One flash - Over heat condition Two flashes - Pressure switch inactive Three flashes Purge / Interwait Four flashes - Pressure switch lockout Five flashes Ignition lockout Six Flashes valve fault lockout Seven flashes Over temperature lockout Eight flashes Frequency lockout timing fault Nine flashes - flame lockout invalid flame A/D value Ten flashes False flame Eleven flashes - SafeStart lockout Twelve flashes Secondary safeguard timing fault Three slow flashes - Ground fault lockout MAIN COMPONENTS SERVICING Gas valve servicing Gas valve servicing (cont) Combustion fan servicing Spark igniter servicing Flame sensor servicing Pressure switch servicing Main fan assembly servicing Unit operation Service Manual 407 Compact Classic Series 06/11/13 3

4 7. DISMANTLING PROCEDURES Burner assembly removal Gas manifold assembly removal Gas valve removal Pressure switch assembly removal Combustion fan removal HCDSI24-1 Electronic control board removal to 24 Volt transformer removal Heat exchanger removal Remove from the top Remove from the front Flue spigot removal Flue instructions Main fan assembly removal Splitting internal model heaters NOTES: Service Manual 407 Compact Classic Series 06/11/13 4

5 1.1 SCOPE This Service Manual contains information relevant to servicing a Brivis CC3 Gas Ducted heaters. It is intended for Service personnel who have received adequate training on Brivis Gas Fired Ducted Central Heaters, in particular Brivis series heaters Brivis Classic CC3 Model Gas Ducted Heater The New Brivis Compact Classic CC3 series ducted central heater is an updated Model to the Classic Wombat range heater. The Brivis CC3 Ducted central heater has a new electronic control system and combustion now fan forced. The model range as follows: Model KiloWatt Star Rating CC CC CC320XA CC CC325XA CC CC330XA The New Brivis Compact Classic CC3 Gas ducted heater consists of the following features: The Tytronics HCDSI24-1DT Gas Fired ducted Heater control board with LED diagnostic display. A direct main burner ignition system. Single speed fan forced combustion process. Supply air and flame roll out over temperature safety shutdown switches. An external pressure switch so once the combustion fan pressure is sufficient it ensures the correct burner operation. Fixed Speed main circulating fan, with three speed options. All model heaters operate on a conventional 24Volt manual or programmable thermostat. Service Manual 407 Compact Classic Series 06/11/13 5

6 The main sections covered include: Heater operation Troubleshooting Servicing Component Removal/Assembly Procedures Technical Specifications Further information on installation and operation of Brivis Compact Classic heaters can be obtained from the Heating Installer s Manual and Heating Owner s manual Note: Safety Warning DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE. DO NOT USE OR STORE FLAMMABLE MATERIALS NEAR THIS APPLIANCE. DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION. DO NOT MODIFY THIS APPLIANCE. Service Manual 407 Compact Classic Series 06/11/13 6

7 Technical Information CC3 15 AGA Approval No.: Energy Label Star Rating: 3 stars 173 MJ/m 3 /Year Dimensions Width Height Depth Weight Cabinet 385mm 604mm 724mm 52 kg Duct Connection 300mm Gas Type Natural Gas Input (max) Output (max) Burner Pressure (max) Gas Injector Orifice Main Burner Fan Motor Model Model No. Watts Amps Capacitor Fan Impellor Size 70MJ/h 15kW 0.86KPa 2.25mm Standard Fasco MVA-A Watts 1.65Amps 8uF 240mm x 180mm (9 X7 ) Combustion Fan: Model. Sohen Model No. FL120042Y - 13 Watts. 60 Watts Amps 0.55 Amps Resistance 40.6 Ω Return Air Grille Size With Filter 0.30m 2 No Filter 0.21m 2 Total Static Pressure 50 Pa 75 Pa 100 Pa 125 Pa Standard 540l/s 520l/s 500l/s 480l/s Gas Valves: VR8215S,T Honeywell Pressure Switch: Cleveland NS2 diaphragm switch 90pa ±12pa Main Burner:. In shot Burner Ignition System Tytronics HCDSI24-1DT control box Intermittent Sparking Pilot. Heat Exchanger: Aluminised Steel Tubes Control Fuse: 2 Amp type 3AG. Slow blow Transformer: Model B /12V, 50HZ, 1.75Amps. Over Temperature Switch: Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90 o C). Flame Roll-Out Sensor (AFRO): Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90 o C).. Electronic Heater Controller: FEATURES: Tytronics HCDSI24-1DT control box with LED diagnostic display, flame roll-out Klixon, direct main in-shot burners, induced combustion airflow, circulation air fan has an optional 3 speeds for heating. Wiring terminal connection for thermostat / system with heat. No add on cooling or fan only capability. Service Manual 407 Compact Classic Series 06/11/13 7

8 Technical Information CC3 20 AGA Approval No.: Energy Label Star Rating: 3.5 stars 160 MJ/m 3 /Year Dimensions Width Height Depth Weight Cabinet 385mm 604mm 724mm 53 kg Duct Connection Standard Xair 300mm 350mm Gas Type: Input (max) Output (max) Burner Pressure (max) Gas Injector Orifice Main Burner Natural Gas 90MJ/h 20kW 0.80KPa 2.25mm Fan Motor Standard Extra air Model Fasco Fasco Model No NVA-A NVA-A13 Watts 315 Watts 315 Watts Amps 2.5 Amps 2.5 Amps Capacitor 4 uf 4 Uf Fan Impellor Size 240mm x 180mm (9 X7 ) 240mm x 180mm (9 X7 ) Combustion Fan: Model. Sohen Model No. FL120042Y - 13 Watts. 60 Watts Amps 0.55 Amps Resistance 40.6 Ω Return Air Grille Size Standard Extra air With Filter 0.30 m m 2 No Filter 0.24 m m 2 Total Static Pressure 50 Pa 75 Pa 100 Pa 125 Pa Standard 540l/s 520l/s 500l/s 480l/s Extra Air 625l/s 596l/s 570l/s 545l/s Gas Valves: VR8215S,T Honeywell Pressure Switch: Cleveland NS2 diaphragm switch 70pa ±12pa Main Burner:. In shot Burner Ignition System Tytronics HCDSI24-1DT control box Intermittent Sparking Pilot. Heat Exchanger: Aluminised Steel Tubes Control Fuse: 2 Amp type 3AG. Slow blow Transformer: Model B /12V, 50HZ, 1.75Amps. Over Temperature Switch: Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90oC). Flame Roll-Out Sensor (AFRO): Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90oC). Electronic Heater Controller: FEATURES: Tytronics HCDSI24-1DT control box with LED diagnostic display, flame roll-out Klixon, direct main in-shot burners, induced combustion airflow, circulation air fan has an optional 3 speeds for heating. Wiring terminal connection for thermostat / system with heat. No add on cooling or fan only capability. Service Manual 407 Compact Classic Series 06/11/13 8

9 Technical Information CC3 25 AGA Approval No.: Energy Label Star Rating: 3.1 stars 169 MJ/m 3 /Year Dimensions Width Height Depth Weight Cabinet 385mm 604mm 724mm 53 kg Duct Connection Standard Xair 300mm 350mm Gas Type Input (max) Output (max) Burner Pressure (max) Gas Injector Orifice Main Burner Natural Gas 107MJ/h 25kW 0.86KPa 2.35mm Fan Motor Standard Extra air Model Fasco Fasco Model No NVA A NVA A13 Watts 425 Watt 425 Watt Amps 2.5Amps 2.5 Amps Capacitor 10 uf 10uF Fan Impellor Size 240mm x 180mm (9 X7 ) 240mm x 180mm (9 X7 ) Combustion Fan: Model. Fime GRO4100 Model No. FL120042Y - 13 Watts. 60 Watts Amps 0.55 Amps Resistance 24.3 Ω Return Air Grille Size Standard Extra air With Filter 0.33m m 2 No Filter 0.23m m 2 Total Static Pressure 50 Pa 75 Pa 100 Pa 125 Pa Standard 600l/s 580l/s 560l/s 525l/s Extra Air 680l/s 650 l/s 620 l/s 593l/s Gas Valves: VR8215S,T Honeywell Pressure Switch: Cleveland NS2 diaphragm switch 115pa ±12pa Main Burner:. In shot Burner Ignition System Tytronics HCDSI24-1DT control box Intermittent Sparking Pilot. Heat Exchanger: Aluminised Steel Tubes Control Fuse: 2 Amp type 3AG. Slow blow Transformer: Model B /12V, 50HZ, 1.75Amps. Over Temperature Switch: Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90oC). Flame Roll-Out Sensor (AFRO): Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90oC).. Electronic Heater Controller: FEATURES: Tytronics HCDSI24-1DT control box with LED diagnostic display, flame roll-out Klixon, direct main in-shot burners, induced combustion airflow, circulation air fan has an optional 3 speeds for heating. Wiring terminal connection for thermostat / system with heat. No add on cooling or fan only capability. Service Manual 407 Compact Classic Series 06/11/13 9

10 Technical Information CC3 30 AGA Approval No.: Energy Label Star Rating: 3.3 stars 165 MJ/m 3 /Year Dimensions Width Height Depth Weight Cabinet 537mm 640mm 845mm 71 kg Duct Connection Standard Xair 350mm 400mm Gas Type Input (max) Output (max) Burner Pressure (max) Gas Injector Orifice Main Burner Natural Gas 133MJ/h 30kW 0.86KPa 2.25mm Fan Motor Standard Extra air Model Fasco Fasco Model No Watts 600 Watt 600 Watt Amps 4.4 Amps 4.4 Amps Capacitor 25uF 25uF Fan Impellor Size 270mm x 265mm (10 X10 ) 270mm x 270mm (10 X10 ) Combustion Fan: Model. Model No. Watts. Amps Resistance Fime GRO Watts 0.55 Amps 24.3 Ω Return Air Grille Size Standard Extra air With Filter 0.51 m m 2 No Filter 0.35 m m 2 Total Static Pressure 50 Pa 75 Pa 100 Pa 125 Pa Standard 1000l/s 970l/s 940l/s 920l/s Extra Air 1060l/s 1040 l/s 1000 l/s 980l/s Gas Valves: VR8215S,T Honeywell Pressure Switch: Cleveland NS2 diaphragm switch 115pa ±12pa Main Burner:. In shot Burner Ignition System Tytronics HCDSI24-1DT control box Intermittent Sparking Pilot. Heat Exchanger: Aluminised Steel Tubes Control Fuse: 2 Amp type 3AG. Slow blow Transformer: Model B /12V, 50HZ, 1.75Amps. Over Temperature Switch: Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90oC). Flame Roll-Out Sensor (AFRO): Supply Air Compartment: Texas Inst Klixon Oil 1747 L90 (opens at 90oC).. Electronic Heater Controller: FEATURES: Tytronics HCDSI24-1DT control box with LED diagnostic display, flame roll-out Klixon, direct main in-shot burners, induced combustion airflow, circulation air fan has an optional 3 speeds for heating. Wiring terminal connection for thermostat / system with heat. No add on cooling or fan only capability. Service Manual 407 Compact Classic Series 06/11/13 10

11 2. Heater Operation This section provides an overview of the operation of the CC3 series heaters. It is vital that an understanding of how CC3 series heaters, and their components, operate in order to service the CC3 Series heater effectively and efficiently. 2.1 Circuit Diagram Service Manual 407 Compact Classic Series 06/11/13 11

12 2.2 Wiring Colour Code Low Voltage (From left to right refer to diagram in section 1.1) Pin Function Colour 1 Gas Valve Violet 2 Gas Valve Grey 3 Pressure Switch Yellow 4 W White 5 Hi-Limit Black 6 24Vac (Hi-Limit) Orange 7 24Vac Red 8 Ground Green High Voltage (From left to right refer to diagram in section 1.1) Pin Function Colour 1 Flame Sense White 2 Neutral Blue 3 Combustion Fan Brown 4 Circulation Fan Red 5 Active Brown Service Manual 407 Compact Classic Series 06/11/13 12

13 2.3 Motor Wiring Diagrams Model Fasco 250W MVA-A22 Fasco 315W 80855NVA-A13 Fasco 315W 80855NVA-A13 (425Watt) Fasco 600W Power 240Volts 240Volts 240Volts 240Volts Maximum Current 1.65 Amp 2.5 Amp 2.5 Amp 4.4 Amp Main Fan Motor Capacitor 8 µf 4 µf 10 µf 25 µf High Winding 20 C Medium Winding 20 C Low Winding 20 C 20.6 Ohms 11 Ohms 20.5 Ohms 6.9 Ohms 26.1 Ohms 14.6 Ohms 26 Ohms 8 Ohms 31.6 Ohms 18 Ohms 31.5 Ohms 9.3 Ohms Impellor Size diam. x width 225mm x 180 mm 240mm x 180 mm 225mm x 180 mm 270mm x 270 mm 2.4 Combustion Fan Resistance Combustion Fan Motor Sohen Winding o C Fime Winding o C Resistance Reading 40.6 Ohms 24.3 Ohms Service Manual 407 Compact Classic Series 06/11/13 13

14 2.5 CC3 Gas Ducted Unit Components Pressure switch PHOTO OF THE UNIT AND ITS COMPONENTS ARE REQUIRED TO BE PLACED HERE. Control board 2.6 Gas Valve Operation Transformer The gas valves function is to provide Combustion gas for combustion. fan The gas valve is a Honeywell VR8215S,T gas valve. For natural gas it has been optimised for direct ignition application and includes a on and off switch and a pressure regulator. The gas valve is controlled by the HCDSI 24-1 PCB control. Please see the technical data sheet for the optimum gas pressures. Pressure switch 2.7 Burner Operation Flue outlet Gas inlet Gas Valve In-shot burners Burner manifold The burners are known as In-shot burners. They consist of a venturi, which helps to draw air into Burner the top of the burner, near the injectors. This is known as primary air and is used for gas mixing before combustion occurs. Once the gas and primary air leave the burner port, at the exit of the burner, combustion begins, and secondary air is added to the flame Assembly from the suction force developed from the combustion fan. There is a cross lighting gallery near the burner exit, which allows for cross ignition between each adjacent burner. Main Circulating fan Supply Air over heat switch Heat Exchanger Note: Fan orientation shown is for 15, 20, and 30 the only. The CC325 has a different fan orientation to the above diagram, i.e upside down. Service Manual 407 Compact Classic Series 06/11/13 14

15 3. Operation Overview The Brivis CC3 series is a 3 Star range suited for internal installations on Natural Gas only. The CC3 series heater has a combustion system consisting of a fixed speed combustion fan and direct spark ignition module. The gas valve is on/off only i.e. not modulating and the rate is set for each model. Once the combustion fan pressure switch validates the system pressure is correct the normal start up sequence will begin, refer below. Upon power up the HCDSI24-1 control board shall perform a system check and allow all of its inputs and outputs to settle. The HCDSI24-1 initiates an ignition cycle upon receiving a call for heat from an external thermostat. The following will occur: The micro-controller shall check that the external flame safety guard is operational. As the flame circuit is earth referenced, additional checks are made to detect an earth disconnect. The control board will do a safety check and make sure the pressure switch circuit is open. The unit then energises the combustion fan motor, and verifies that the pressure switch closes. The unit will operate for the pre-purge time before continuing to the safety time. The unit shall simultaneously energise the spark igniter and gas valve with the intention to light the main gas burner. The igniter shall be energised for at most the duration of the safety time or until a valid flame signal is detected which ever occurs first. Safety time shall cause the gas valve and combustion fan to remain energised for the duration of the call for heat. 20 seconds after the warm up period the control board will then power the main supply air fan to its set speed. Service Manual 407 Compact Classic Series 06/11/13 15

16 3.1 HCDSI24-1 Control Board The HCDSI24-1 control is a single printed circuit board (PCB) assembly, mounted within a plastic enclosure. The controller provides status and diagnostic information directly through the use of a Green LED indicator. An additional Red LED provides direct indication of the pressure switch status. HCDSI 24-1 Control Board Ignition Plug 240 Volt AC Connections See next page for colour coding and wiring LED s 24 Volt AC Connections 2 amp fuse 240 Volt Connections Low Voltage Connection Service Manual 407 Compact Classic Series 06/11/13 16

17 3.2 Spark Igniter Operation The Spark Igniter consists of a spark probe and earth probe used to create a fixed spark gap. HCDSI 24-1 generates a spark from the sparker canister across the gap of the sparker probe. This spark gap is located beneath the burner port at one end of the burner rack. Once ignition has occurred and the flame is sensed, the spark igniter stops sparking. 3.3 Flame Sensor Operation The Flame Sensor consists of a single metal probe and is located beneath the burner at the opposite end of the burner rack from the Spark Igniter. When flame is present at this burner, a small electric current passes from the flame sensor through the flame to the closest ground or earth point (either the Burner or Heat Exchanger). HCDSI 24-1 control monitors the Flame Sensor current level. If it is within an allowable range, the controls then allow for normal operation. 3.4 Combustion Fan Operation The combustion fans primary function is to draw air and flame through the heat exchanger. If this combustion airflow is reduced, the combustion quality will be reduced and sooting may occur. If the airflow is reduced considerably, the flames will not be drawn into the heat exchanger. (Fortunately, there are measuring devices to prevent these occurrences from causing an unsafe condition). The combustion fan operates at a fixed fan speed, and is switched on and off by the HCDSI 24-1 control. When the fan is in operation, the suction effect of the fan creates a (vacuum)+ inside the heat exchanger from the heat exchanger inlet ports all the way through to the combustion fan box on which the combustion fan is mounted. During start-up, the combustion fan performs a pre-purge for approximately 15 seconds. This ensures there is no un-burnt fuel in the heat exchanger. During this phase, the required quantity of air for adequate combustion is confirmed by a vacuum pressure switch. If the airflow is not sufficient, the vacuum pressure will be too low, and the pressure switch will not close circuit. A pressure switch error will be logged and no ignition will occur. During normal operation the vacuum pressure generated by the combustion fan is continually monitored by the pressure switch. If this vacuum pressure drops too low, the pressure switch will go open circuit, the burners will the shut down and an error will be logged. During a normal shut down sequence, the burners will shut down, and the combustion fan will switch off after 5 seconds. Service Manual 407 Compact Classic Series 06/11/13 17

18 3.5 Pressure Switch Operation PRESSURE SWITCH: The pressure switch is a Cleveland NS2 series diaphragm pressure differential activated switch. The CC3 models have one pressure switch. Please see the table below for the operating range. The pressure switch for proving sufficient combustion airflow is located in the vicinity of the combustion fan and measures the vacuum pressure in the heat exchanger outlet box. If there is insufficient vacuum pressure to ensure safe and reliable ignition, or combustion quality, the switch will go open circuit and the 24 volt supply to the gas valve cut. Model Combustion Airflow Proving Switch Open Circuit Vacuum Pressure (Pa) CC315 90±12 CC320 70±12 CC320XA 70±12 CC ±12 CC ±12 CC330XA 115± Main Fan Assembly Operation ROOM AIR FAN A centrifugal fan and Permanent Split Capacitor (PSC) motor, housed in a metal scroll are used for room air circulation, and this is contained within the fan cabinet. The room fan has 3 speed settings and can be adjusted to obtain the required air flow. The three settings are low, medium and high and can be changed by shifting the position of the fan spade terminal. Note: Refer to data sheets for fan and capacitor specifications. Service Manual 407 Compact Classic Series 06/11/13 18

19 3.7 Operation Flow Charts Heater Start up Flow Chart Call from heat from the thermostat System checks: Flame sensors earth Pressure switch open Combustion fan hold off (2 sec) Pressure Switch Closes Combustion Fan Prepurge (20 sec) Ignition retry phase activated (5 Max number of Ignition attempts) Ignition Flame detect time Has flame been detected within 5 seconds? No Yes Flame validate time Has flame been present for 5.5 seconds? No Initiate main fan hold-off time of 20 seconds. Fan speed ramps up to required speed Normal operation continues Steady state operation Service Manual 407 Compact Classic Series 06/11/13 19

20 3.8 Heater Shut down Flow Chart Heater thermostat switched off Gas valve closes Combustion fan post-purge (5 sec) Circulation Fan Off Delay 80 Seconds Main fan turns off Service Manual 407 Compact Classic Series 06/11/13 20

21 4. INSTALLATION & COMMISSIONING REFER TO HEATING INSTALLER S MANUAL FOR INSTALLATION AND COMMISSIONING INSTRUCTIONS. 5. TROUBLESHOOTING Most failure modes will result in a fault being logged in the HCDSI 24-1 control board. These faults can be viewed at the control Board. A brief description of each fault code is shown below, followed by detailed troubleshooting for each fault code. 5.1 LED FLASH CODES One green LED is used to display the status of the HCDSI24-1DT. The LED flashes up to 12 times on a 4.8-second repeat to indicate fault status. LED NORMAL OPERATION Slow single flash (200mS flashcode: ) Slow double flash (200mS flashcode: ) FAULT CONDITION HCDS123 is functioning normally, and is in an idle state HCDS123 is functioning normally, with the thermostat closed One flash repeated every 4.8 Overheat condition seconds (200mS flashcode: Overheat in progress ) Overheat switch is disconnected or O/C Two flash (200mS flashcode: Pressure Switch inactive ) Fan running but pressure switch is still open Fan stopped but pressure switch is still closed Three flash ( 200mS flashcode: Purge / Interwait ) Timer operating eg Stat off during flame Establishment time Flame establishment time elapsed without flame Four flash (200mS flashcode: Pressure Switch Lockout ) Pressure Switch not functional Fail to close timeout / fail to open timeout Five flash (200mS flashcode: Ignition Lockout - failure to ignite flame ) Max number of re-ignition / spark restoration attempts has been reached. Six flash (200mS flashcode Valve Fault Lockout - Valve Detection Failure ) Valve is disconnected. Gas valve drive relay contacts fail to close. Gas valve drive Triac fault: Open or half-wave. Service Manual 407 Compact Classic Series 06/11/13 21

22 Seven flash (200mS flashcode: Over-temp Lockout ) Too many Hi-Limit activations in latest heat cycles. Hi-Limit activation continues longer than Hi-Limit fan + cool down times. Eight flash (200mS flashcode: Frequency Lockout - Timing fault ) Supply frequency outside operating limits. Microprocessor clock outside operating limits. Nine flash (200mS flashcode: Flame Lockout - Invalid Flame A/D valve ) Flame sense hardware fault. Ten flash (200mS flashcode: False Flame ) Invalid flame sensed during safe start check or IDLE - hardware fault. Eleven Flash SafeStart Lockout - Secondary safeguard timing fault. (200mS flashcode: Main valve safeguard too slow or failed to activate ) hardware fault. Twelve flash SafeStart Lockout - Secondary safeguard timing fault. (200mS flashcode: Safestart checks did not complete in time, no hardware ) fault recorded. 3 Slow flashes Ground Fault Lockout - Flame sense fault. (200mS flashcode: Flame variation detected due to poor earth connection to ) chassis ground. A lockout is a result of a detected fault condition, caused by an operational or a safeguard fault. In the case of a lockout, the unit shall both de-energise the triac drive and stop the control signal to the relay drive circuit. Consequently the gas valve is completely isolated and will close. The unit shall remain in lockout until manually reset. The lockout failure mode shall be distinguished by the status LED flash-code. Each individual flash shall have a 200milli-second sub-period. The sequence shall repeat with an approx five second period. Lockout shall be cleared by any of the following: Power isolation for more than 2 seconds Cycle of the Thermostat input 6 times within a 60 seconds, each cycle must be at least 2- seconds in duration. Service Manual 407 Compact Classic Series 06/11/13 22

23 5.2 One flash - Over heat condition Reason Overheat condition This errors will appear whilst an over temperature is current. The over heat switch or flame rollout circuit is open and measuring a temperature greater than 90 C. The heater s fan will be forced to operate at its predetermined speed for a specific time period. Supply air over heat and Flame Roll - out All Brivis CC3 models have a supply air over heat switch located near the supply air discharge and is activated when the supply air reaches 90 C. Also if the flame roll out occurs the switch will interrupt the 24 Volt power to the gas valve if flame rollout and over heat occurs. The following will occur. The power supply to the gas valve will be terminated. The fan will operate immediately, if not already operating. Once the over temperature condition of the switches has cleared and the switch resets (i.e. switch closes within a specific time), a cool down period will operate for a duration of 120sec. Then the normal heating cycle can commence again, provided the wall control is still calling for heat. Service Check List: Check the temperature rise value of the supply air thermistor and nearest outlet temperature, over the room temperature (Return air intake temperature). A 47 0 C. Temperature rise will indicate a true overheat condition. Check there are sufficient outlets open on the duct system. Check the return air filter (if fitted) is sized correctly and is clean. Check that the fan speed is sufficient for the system so that over heating will not result. Check the fan motor is functioning correctly, and is not blocked or obstructed. Check the ducting has not been crushed, damaged or incorrectly sized. Check the return air intake is not subjected to a high temperature from an external source. Check the wire loom and plug connections to the switch are not open circuit, i.e. wire fallen off switch. Service Manual 407 Compact Classic Series 06/11/13 23

24 5.3 Two flashes - Pressure switch inactive Reason: Pressure switch inactive A pressure switch within the appliance provides proof of combustion airflow. During the ON phase of the heating cycle the pressure switch has opened, indicating a loss in vacuum pressure. The heating cycle will be forced to its OFF state and a restart initiated. If this occurs continuously the unit will lockout and manual reset will be required. During a heating cycle, the unit responds to the state of this switch in the following ways. Pressure switch fails to open. Once the unit is calling for heating the control board will first ensure the combustion air pressure switch is open (no air flowing) before energising the combustion fan. How ever If the pressure switch is closed then the unit shall wait for the switch to open for as long as the call for heat is present. If the pressure switch remains closed longer than 30 seconds the corresponding two flash warning flash code is displayed. If the pressure switch remains closed longer than 4 minutes, the unit shall lockout and the four flash fault code is flashed on the status LED. Once lockout occurs, the combustion fan turns off. Pressure switch fails to close. If the combustion fan pressure switch does not close shortly after the combustion fan has been energised the unit shall keep the combustion fan energised for 4 minutes, until either the pressure switch closes or the call for heat is removed. If the pressure switch remains open longer than 30 seconds, the 2 flash fault code is displayed. If the pressure switch remains open longer than 4 minutes, the unit shall lockout and the four flash fault code is flashed on the status LED, once lockout occurs the combustion fan turns off. Service Check List Vacuum Pressure Checking Procedure Measure vacuum pressure at the pressure switch during pre-purge (or force an overheat condition, by breaking the overheat switch circuit, to operate the combustion fan). Perform these pressure checks without the pressure switch connected to the pressure hose. If vacuum pressure is above specification If the flue has no blockage and you find the vacuum pressure is above the pressure switch s specified value and pressure switch error still occurs, then the pressure switch may be faulty and should be replaced. If vacuum pressure is below specification 1. Vacuum pressure hoses are not fitted correctly check hose connections 2. Vacuum pressure hoses have perished and cracked causing vacuum pressure loss check for deterioration. 3. Water trapped in the vacuum pressure hose check for water traps or presence of moisture in hoses. Make sure there is no water in the hose when servicing the system. 4. Excessive heat exchanger leakage resulting in vacuum pressure loss check heat exchanger for leakage. 5. Combustion fan may be faulty check according to procedure in section (Combustion Fan) 6. Flue piping is too restrictive check against allowable flue pipe configuration specification including the flue cowl. 7. Flue pipe has collected excessive condensate check for potential collection points (there must be a continual fall back to the heater 20mm rise per Metre). Service Manual 407 Compact Classic Series 06/11/13 24

25 5.4 Three flashes Purge / Interwait Purge / Interwait Timer operating Eg: Stat off during flame establishment time Flame establishment time elapsed without flame This failure can be caused by the unit failing to ignite at the start of its on time cycle without a flame being detected. Service Check List: 1. Check gas pressure or supply pressure 2. Check ignitor is in its right position 3. Check ignitor lead 4. Check gas valve loom and connections 5. Check flame sensors 5.5 Four flashes - Pressure switch lockout Reason Pressure switch lockout If the combustion fan pressure switch does not close shortly after the combustion fan has been energised, the unit shall keep the combustion fan energised for 4 min, until either the pressure switch closes or the call for heat is removed. If the pressure switch remains open longer than 4 minutes, the unit shall lockout. Once lockout occurs, the combustion fan turns off. Service Check List: 1. Refer to Check List for 2 flash Pressure switch inactive Service Manual 407 Compact Classic Series 06/11/13 25

26 5.6 Five flashes Ignition lockout Reason: Ignition lockout failure to Ignite flame within the maximum allowable Ignition retry phase. There is a maximum of 5 re-ignition attempts before the control board will lockout. If a valid flame is undetected for the duration of the flame establishment or first safety time, the unit shall enter lockout and flash 5 time fault code on the status LED. The safety time represents the maximum time gas can flow without combustion occurring. Service Check List: 1. Check the igniter high tension lead and terminal connections. 2. Check the igniter rod is clean 3. Check the igniter ceramic insulation is not cracked or damaged. 4. Check igniter is in its right location 5. Check gas pressure or supply pressure 6. Check gas valve loom and connections 7. Check if the control board is sparking 5.7 Six Flashes valve fault lockout Reason : The gas valve has failed to open and has Detected as failure Gas valve drive relay contacts fail to close Short open or half wave Gas valve drive triac fault Service Check List: 1. Check the gas valve wiring has not been disconnected. 2. Check that there is no break in the wiring loom. 3. Check that the gas valve has not shorted or is in open circuit. 4. Check voltage to the wiring loom to gas valve. 5. Check the control board if board failure. Service Manual 407 Compact Classic Series 06/11/13 26

27 5.8 Seven flashes Over temperature lockout Reason Too many overheats activations in latest heat cycle Overheat activation continues longer than overheat fan and cool down Service Check List: Please refer to over heat conditions in this manual. 5.9 Eight flashes Frequency lockout timing fault Reason Supply frequency outside operating limits Microprocessor clock outside operating limits The frequency check determines that the operating frequency of the micro-controller internal clock is correct. Comparison against the known mains frequency signal, being 24v AC 50Hz, shall be used to make this determination. The duration of this test shall be approximately 0.5 seconds A failure in the clock circuit shall enter the unit into lockout and flash the eight flash on the LED status light. Service Checklist 1. Check power supply. 2. Check polarity at power point. 3. Check transformer voltage. 4. Control board failure. Service Manual 407 Compact Classic Series 06/11/13 27

28 5.10 Nine flashes - flame lockout invalid flame A/D value Reason Flame sense hardware fault. Control board start up safety check failure. Service Checklist 1. Check power supply. 2. Check polarity at power point. 3. Check transformer voltage. 4. Check flame sensor. 5. Hardware fault during start up operation Ten flashes False flame Reason Invalid flame sensed during safe start check or IDLE hardware fault. Detection of flame signal at power-up, while IDLE, or prior to ignition shall cause the unit to enter a volatile lockout and flash ten times on the status LED. Detection of the flame signal variation indicative of a grounding fault shall cause the unit to enter a volatile lockout. Service Checklist 1. Check power supply. 2. Check polarity at power point. 3. Check transformer voltage. 4. Check over heat switch is faulty. 5. Gas valve passing gas. Service Manual 407 Compact Classic Series 06/11/13 28

29 5.12 Eleven flashes - SafeStart lockout Reason Main valve safeguard too slow or failed to activate hardware fault. Confirmation that the secondary safeguard hardware timing circuit is within tolerance. Measurements are made by the micro-controller concerning the ability of the flame circuit to operate the secondary safeguard circuit, and that the timing is within allowable tolerance. The upper limit is the specified flame establishment time. If the safeguard circuit fails verification, the unit shall enter lockout and shall flash eleven flashes on the status LED. Service Checklist 1. Check power supply. 2. Check polarity at power point. 3. Check transformer voltage. 4. Control board failure Twelve flashes Secondary safeguard timing fault Reason SafeStart checks did not complete in time, no hardware fault recorded. Service Checklist 1. Check power supply. 2. Check polarity at power point. 3. Check transformer voltage. 4. Control board failure. Service Manual 407 Compact Classic Series 06/11/13 29

30 5.14 Three slow flashes - Ground fault lockout Reason Flame variation detected due to poor earth connection to chassis ground. There has been a false flame that is detected during a power reset turning on and off. There has been a false flame has gone away after an over heat condition has been cleared. Service Checklist 1. Check the earthing system. 2. Check the control board. 3. Check the flame sensor. 4. Check the gas valve. 5. Check the flame roll out switch. 6. Check the flame roll out switch loom. Service Manual 407 Compact Classic Series 06/11/13 30

31 6. MAIN COMPONENTS SERVICING This section contains the procedures for checking and adjusting (if necessary) main components of the heater. This may be required due to a failure or a routine service. 6.1 Gas valve servicing The diagram below indicates the measurement and adjustment locations. If adjustment to the gas valve is required, remove the cap screw and adjust via the pressure regulator adjustment screw. VR8215S Direct ignition combination gas controls Gas valve checking and adjustment (only if required). To check for correct gas valve settings and operation the following should be performed, and adjustments made when necessary. Inlet Pressure Measurement Remove the gas inlet tap and replace with a pressure test point. Connect a suitable manometer to the test point. Turn on the heater and wait for the flame proving period to finish. Check that the inlet gas pressure is between 1.1 kpa to 3.5 kpa. Pressures below this level can result in insufficient gas pressure for combustion. If this is the case then this situation should be rectified. Remove the manometer and remove the test point. Replace the gas inlet tap and test for gas leakage. Note: Please use an approved sealant. Service Manual 407 Compact Classic Series 06/11/13 31

32 Gas valve servicing (cont) Low Inlet pressures It is possible that low inlet pressure can cause: Unreliable ignition if the inlet pressure is below 0.80 kpa at the time of ignition. Underrated heat output Burner Pressure Measurement 1. Remove the gas burner pressure tap and replace with a pressure test point. 2. Connect a suitable manometer to the test point. 3. Screw the test point until its fully sitting in the outlet tightly. 4. Loosen the burner pressure test point screw, on the gas valve in the location shown in the diagram, and connect a suitable manometer immediately. 5. Turn on the heater and wait for the flame proving period to finish. 6. Check the burner gas pressure and if it requires adjusting please follow the below steps. 7. Unscrew the pressure regulator adjustment cap. 8. There is a adjustment screw under the cap which will adjust the burner pressure. 9. Clockwise will increase the gas pressure. 10. Anticlockwise will decrease the gas pressure. 11. The table below shows the gas pressure for each unit. 12. Turn the unit off and remove the manometer and unscrew the test point and rescrew the cap back into its place. 13. Please ensure there is no leaks on each of the pressure tap screw. Note: Please use an approved sealant. For gas pressure please refer to technical information sheet. Service Manual 407 Compact Classic Series 06/11/13 32

33 6.2 Combustion fan servicing General Service 1. Check that the motor s shaft spins freely. 2. While in operation during a prepurge, check for any unusual noise, such as bearing or scraping noise. If there is any suspicion of an underperforming combustion fan or that the entire system is resulting in low vacuum pressure, the following should be performed: 1. Isolate the heater s power supply. 2. Check the motor s winding resistance with the wire looms removed. 3. Re-insert the motor s wiring loom. 4. Connect a manometer into the combustion fan vacuum pressure hose to measure the vacuum pressure just prior to the combustion fan. 5. Re-apply power to the heater and force it into an overheat mode to power up the combustion fan. (Warning: Remember the motor operates with 240 Vac.) 6. Measure the combustion fan vacuum pressure, and ensure that it reaches the value as specified in the table below. Combustion Fan Motor Sohen Winding o C Fime Winding o C Resistance Reading 40.6 Ohms 24.3 Ohms If the vacuum pressure is below the specified values: 1. Check that the flueing is within the allowable specifications. 2. Look for any physical causes of underperformance such as the build up of soot or silicon in the combustion fan housing or flue pipe. Clean if necessary. Servicing while removed It may be required to remove the combustion fan to inspect it totally or to try a new combustion fan. Refer to section 6.5 for removal procedure of the combustion fan. For air pressure signals please refer to technical information sheet. Service Manual 407 Compact Classic Series 06/11/13 33

34 6.3 Spark igniter servicing Isolate the heater power and gas supply from the unit. Checking the spark ignitor 1. Unscrew the spark igniter away from the burner 2. Check spark igniter electrode, lead and plug connection 3. Clean igniter probe and make sure there is a spark gap of approx ±2mm. 4. Then reassemble. Checking spark igniter location relative to burner face 1. Remove the burner assembly as described in removal procedure Measure the distances as shown in the diagram below. 3. Installation is a reversal of the removal procedure. 11±1.5 mm 8.5±1.5 mm Sparker probe end is in alignment with burner centreline ±2 mm. 6.4 Flame sensor servicing Isolate the heater power and gas supply from the unit. Checking the flame sensor 1. Check that the flame sensor rod is clean, located correctly and the lead and plug connection is in good condition. 2. Reassemble. Checking flame sensor location relative to burner face 1. Remove the burner assembly as described in removal procedure 5 2. Measure the distances as shown in the diagram below. 3. Installation is a reversal of the removal procedure. 12±2 mm 11±2 mm Service Manual 407 Compact Classic Series 06/11/13 34

35 6.5 Pressure switch servicing 1. Isolate the heater power and gas supply from the unit. 2. Tap into the pressure switch line with a PVC T-Piece with a suitable manometer. 3. Check that the pressure switch is opening within the limits specified below as follows: 4. Measure the vacuum pressure and make sure the vent hole and bleed hole are clear of any foreign material. 5. Make sure the hoses are free of condensation. 6. Check the hoses leading to the pressure switch are clear of foreign material 7. Reassemble. Vent Hole (2.3 mm) Bleed Hole (0.4 mm) For Air pressure settings please refer to technical information sheet 6.6 Main fan assembly servicing Internal Models 1. Turn the unit OFF and isolate the power supply. 2. Remove the panel on the fan compartment gas entry side of the heating unit so there is access to the fan motor assembly. 3. Remove fan housing from cabinet. 4. Remove fan assembly from housing. 5. Clean impellor and motor. 6. Clean housing. 7. Reassemble. 8. Check all wiring cables and plug connections. Installation is a reversal of the removal procedure. Service Manual 407 Compact Classic Series 06/11/13 35

36 6.7 Unit operation 1. Check power supply lead is in good condition. 2. Check all gas connections are good and do not leak. 3. Check the wall control wiring connection at the unit is in good condition. 4. Check the maximum burner pressure at the test point provided on the gas valve. 5. Check the duct system airflow distribution, balance and adjust as required. 6. Check the unit s selected 3 speed fan is appropriate for optimum heat output for the application. Service Manual 407 Compact Classic Series 06/11/13 36

37 7. DISMANTLING PROCEDURES Before any of the following assemblies or components can be removed, it is important to isolate the heater s power supply. The lid of the heater will also have to be removed by removing 2 screws at each end of the lid. 7.1 Burner assembly removal 1. Turn the gas isolation valve off and isolate the heater s power supply 2. Remove the gas valve loom; spark igniter lead, flame sensor lead and flame rollout switch loom and plate. 3. Remove the gas inlet pipe off the gas valve and move the piping enough to enable the burner assembly to be removed when ready. 4. Remove the 2 screws that hold the flame rollout switch plate then remove the plate away from the gas manifold. 5. Remove the other 2 screws holding the burner manifold to the burner assembly and remove the assembly. 6. Remove the 4 screws holding the burner assembly to the heat exchanger main plate. 7. The burner assembly can now be removed. Installation is a reversal of the removal procedure with attention to the following points: 1. Ensure that the gas inlet feed-tube is retightened and checked for leaks. 2. Ensure that all looms, wires and leads are not damaged along their length and at the connectors. 7.2 Gas manifold assembly removal 1. Turn the gas isolation valve off and isolate the heater s power supply. 2. Remove the gas valve loom from the gas valve. 3. Remove the gas inlet feed-tube off the gas valve. 4. Remove the 2 screws that hold the flame rollout switch plate then remove the plate away from the gas manifold. 5. Remove the 2 screws holding the gas manifold to the burner assembly. 6. The gas manifold assembly can now be removed. Installation is a reversal of the removal procedure with attention to the following points: 1. When re-inserting the assembly, ensure that the injectors are inserted into the ring on the top of the burners correctly. 2. Ensure that the gas inlet feed-tube is retightened and checked for leaks. 3. Ensure that the gas valve loom is not damaged along its length and at the connector. Service Manual 407 Compact Classic Series 06/11/13 37

38 7.3 Gas valve removal 1. Turn the gas isolation valve off and isolate heater s power supply 2. Disconnect the gas valve loom. 3. Remove the gas inlet feed-tube off the gas valve. 4. Remove the gas valve from the burner manifold by unwinding it in an anti-clockwise direction. 5. Remove the brass adaptor on the gas valve inlet side of the gas valve if the valve is to be replaced. Installation is a reversal of the removal procedure with attention to the following points: Clean any threads of excessive gas thread sealant, which are to be re-assembled If a new gas valve is to be fitted, apply gas thread sealant to the brass adaptor and fingertighten onto the gas valve. Apply gas thread sealant to the burner manifold feed tube nipple and screw on the gas valve, and then tighten. Check for leaks on both sides of the gas valve while in operation. If a new gas valve is fitted, ensure that it is reset, including the ignition gas pressure, as outlined in the technical information sheet regarding the unit pressures. 7.4 Pressure switch assembly removal 1. Isolate the heater s power supply. 2. Remove the hose from the pressure switch. 3. Remove the electrical wires from the pressure switch. 4. Remove the pressure switch fastening screw if the pressure switch is to be replaced. Installation is a reversal of the removal procedure with attention to the following points: Ensure all wiring connections are positively located and that no looms have been damaged. Service Manual 407 Compact Classic Series 06/11/13 38

39 7.5 Combustion fan removal Method 1 Partial fan removal 1. Isolate the heater s power supply. 2. Remove the electrical leads off the combustion fan. 3. Remove the 4 screws off the flue adaptor plate that is secured to the unit. 4. Remove 3 screws which fasten the combustion fan down to the combustion fan box. 5. Pry the combustion fan off the box, which will still be fastened by the sealing heat proof silicon. Installation is a reversal of the removal procedure with attention to the following points: 1. Clean both surfaces to be re-mated together. 2. Apply sufficient (but not excessive) silicon to the combustion fan s mating surface. 7.6 HCDSI24-1 Electronic control board removal 1. Isolate the heater s power supply. 2. Remove the spark igniter lead from the PCB assembly. 3. Remove all other electrical connections from the PCB assembly. 4. Remove the 4 screws that secure the HCDSI 24-1 to the top plate of the fan compartment. WARNING: Care should be taken to prevent any damage to the wiring and PCB. Installation is a reversal of the removal procedure with attention to the following points: Ensure all wiring connections are positively located and that no looms have been damaged to 24 Volt transformer removal 1. Isolate the heaters power supply. 2. Remove all inter-connecting conductors. 3. Remove the 2 screws that secure the transformer to the top plate of the fan compartment Installation is a reversal of the removal procedure with attention to the following points: Nominal Voltage/ Maximum Current 230 VAC / 1.75 A 1.75A Transformer Secondary Voltage (No Load) (Blue 230 VAC Secondary Voltage (With Load) (Blue 230 VAC VAC 24± 3% VAC Resistance reading on primary 20 0 C Resistance reading on 20 0 C 63.6 Ω 1.45 Ω Service Manual 407 Compact Classic Series 06/11/13 39

40 7.8 Heat exchanger removal Remove from the top. 1. Isolate the heater s power supply. 2. Remove the main wiring looms in the heater combustion chamber. 3. Remove the burner manifold. 4. remove the pressure switch and hose. 5. Remove the burner assembly. 6. Remove the 4 screws that hold the heat shield in the combustion assembly.(2 screws on the heat exchanger and 2 screws located in the control chamber). 7. Remove the 4 screws that hold the heat exchanger to the frame of the unit. 8. Remove the 4 screws that located external to the unit 2 on the gas valve side of the unit and the other 2 are located on the combustion flue side of the unit. 9. Then proceed to remove the 4 screws on the side plate of the heat exchanger (gas inlet side) and remove the side plate. 10. Then raise the heat exchanger making sure the heat exchanger has been fully removed Remove from the front 1. Isolate the heater s power supply. 2. Remove the main wiring looms in the heater combustion chamber. 3. Remove the burner manifold. 4. remove the pressure switch and hose. 5. Remove the burner assembly. 6. Remove the 4 screws that hold the heat shield in the combustion assembly.(2 screws on the heat exchanger and 2 screws located in the control chamber). 7. Remove the 4 screws that hold the heat exchanger to the frame of the unit. 8. Remove the 4 screws that located external to the unit 2 on the gas valve side of the unit and the other 2 are located on the combustion flue side of the unit. 9. Then proceed to remove the 4 screws on the side plate of the heat exchanger (gas inlet side) and remove the side plate. 10. Then slide the heat exchanger through the front making sure the heat exchanger has been fully removed. Installation is a reversal of the removal procedure with attention to the following points: Clean both surfaces to be re-mated together. Ensure all wiring connections are positively located and that no looms have been damaged. When re-inserting the burner assembly, ensure that the injectors are inserted into the ring on the top of the burners correctly. Ensure that the gas inlet feed-tube is retightened and checked for leaks. Ensure that the gas valve loom is not damaged along its length and at the connector. Service Manual 407 Compact Classic Series 06/11/13 40

41 7.9 Flue spigot removal The flue should be fitted to the flue pipe spigot via a bolted flue sleeve connection. 1. Loosen these bolts sufficiently to allow the flue pipe to be removed from the spigot. 2. Ensure that the flue pipe seal exiting the roof is not damaged. 3. Remove the 4 screws holding the flue spigot adaptor to the unit. 4. Remove the flue adaptor plate away from the combustion fan. Installation is a reversal of the removal procedure with attention to the following points: Once reconnected ensure that there are no potential gas leaks from the flue pipe. Also ensure that there as no potential water leaks from damaged roof flashing. Flue pipe coupling Service Manual 407 Compact Classic Series 06/11/13 41

42 7.10 Flue instructions Service Manual 407 Compact Classic Series 06/11/13 42