IDEAL LOGIC HIU Direct HT Installation And Servicing Download Page 29

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FAULT FINDING

LOGIC HIU

Installation & Servicing / Users

61 FAULT FINDING

Fault

Indications

Possible Cause of Fault

Operations to be Performed

The room is

not reaching

the desired

temperature

CH LED on

heating cycle temperature set point too low

increase set point

chrono-thermostat temperature setting incorrect

check programming of chrono-thermostat

HIU strainer clogged

call qualified personnel to have it serviced

heating valve actuator faulty

call qualified personnel to have it replaced

heating valve obturator blocked

call qualified personnel to have it replaced

modulating valve actuator connector disconnected

restore correct connection

DHW temperature probe cable inverted with

heating probe

restore correct connection

presence of air in the system

vent the system

pump (if present) not working

call qualified personnel to have it replaced

pump cable (if present) not connected

restore connection

possible system shut-off valves/terminals closed

open the valves

centralised system temperature insufficient

contact person in charge of system

electronic controller not working

call qualified personnel to have it replaced

primary circuit flow rate insufficient

contact person in charge of system

centralised system not worlcing

contact person in charge of system

CH LED off

timer/thermostat time setting incorrect

check programming of timer/thermostat

timer/thermostat not working

check timer/thermostat

all LEDs are off

electric supply switched off

restore HIU electric supply

protection fuse burnt out

restore HIU electric supply

FAULT led lit

+error code

4 active

heating circuit pressure too low

restore system pressure

FAULT led lit

+error code

5 active

heating temperature probe faulty

call qualified personnel to have it replaced

FAULT led lit

+error code

15 active

compensation temperature probe faulty

call qualified personnel to have it replaced

FAULT led lit

+error code

69 active

safety thermostat cut in

call qualified personnel to have it serviced

FAULT led lit

+error code

76 active

safety relief valve faulty

call qualified personnel to have it serviced

FAULT led lit

+error code

79 active

incorrect switch setting

restore correct switch settings

Summary of Contents for LOGIC HIU Direct HT

Page 1: ...ssured conform to the safety and performance speciﬁcation that we require Do not use reconditioned or copy parts that have not been clearly authorised by Ideal For the very latest copy of literature for speciﬁcation and maintenance practices visit our website www idealcommercialboilers com where you can download the relevant information in PDF format September 2017 UIN 211203 A04 ...

Page 2: ...l control devices e g economisers etc are directly connected to these appliances unless covered by these Installation and Servicing Instructions or as otherwise recommended by Ideal Boilers in writing If in doubt please enquire Any direct connection of a control device not approved by Ideal Boilers could invalidate the certification and the normal appliance warranty INTRODUCTION The Ideal Heat Int...

Page 3: ...HIU to remove any particles rust incrustations lime scale welding slag and any other contaminants The water circuits must be clean and free from debris Make sure that all connection fittings are watertight When connecting water pipes make sure that threaded connections are not mechanically overstressed Over time this may result in breakage causing water damage and or personal injury Water temperat...

Page 4: ...W modulated CH This can be converted to under floor heating including inbuilt safety thermostat capability LOGIC HIU INDIRECT 50 Indirect wall mounted HIU with a 50kW instantaneous priority DHW and 15 kW modulated CH This can be converted to under floor heating including inbuilt safety thermostat capability Note 75 Indirect unit is shown fitted with filling loop attached See Frame 13 ...

Page 5: ...perature 42 to 60 C Domestic hot water 10 bar DHW circuit max flow rate 18 l m 0 3 l s Min flow rate to activate domestic flow sensor 2 7 l m 0 3 Max Differential pressure on domestic water modulating valve Δp 1 65 bar Min Differential pressure on domestic water modulating valve Δp 0 35 bar Heat exchanger capacity Nom DHW heat exchanger net output 50 kW Logic HIU Indirect 50 Nom DHW heat exchanger...

Page 6: ... meter when fitted 4 Primary filter and heat meter probe pocket 5 Heating circuit control valve 7 Modulating primary control valve DHW 8 Plate heat exchanger DHW 9 DHW temperature sensor 10 DHW flow switch 11 Electronic control unit 12 Room controller not supplied 13 Plate heat exchanger space heating 14 Heating flow temperature sensor 15 Temperature control stat 16 Strainer heating circuit 17 Pum...

Page 7: ... Servicing Users FLOW PATH Heating Primary Circuit 5 SCHEMATIC LOGIC HIU INDIRECT 75 LOGIC HIU INDIRECT 50 6 PRIMARY FLOW CHARACTERISTICS 7 PRIMARY FLOW CHARACTERISTICS FLOW PATH DHW Primary Circuit RES ET ON DH W C H FAULT 1 2 RES ET ON DH W C H FAULT 1 2 Kv 2 25 m3 h Kv 2 03 m3 h Pressure loss kPa Pressure loss kPa ...

Page 8: ...0 3 0 4 0 5 0 6 3 2 1 RES ET ON DH W C H FAULT 1 2 5 5 º C 65ºC 5 5 º C 85ºC 75ºC 85ºC 80ºC 75ºC 70ºC 65ºC 60ºC HEATING SECONDRY FLOW CHARACTERISTICS LOGIC HIU INDIRECT 50 75 DHW SECONDRY FLOW CHARACTERISTICS LOGIC HIU INDIRECT 50 75 HEATING FLOW HEATING RETURN DHW OUT MAINS DHW FEED COMMON HEATING SYSTEM Δ H m c a H m c a p bar 3 3 5 G m3 h 0 6 0 4 0 3 0 2 0 1 0 2 5 2 1 5 0 5 0 5 1 6 4 3 2 1 5 7 ...

Page 9: ...iance water check valve incorporated into inlet connection The filling loop and ball valves are used to fill and pressurise the secondary heating system the filling loop must be disconnected after pressurisation to comply with the Water Regulations CONTENT Item Qty Component CH inlet and outlet connection valves 1 1 Ball valve with integral check valve and union joint 2 1 Ball valve with union joi...

Page 10: ...figure the control for different units within the range It is important that they are not changed from those shown below If they carehanged outside of these requirements it will cause the HIU to operate incorrectly and may result in hazardous operational conditions Electronic Control Dip Switch Settings Factory Settings Setting Capability Production settings Type Heating DHW Heating DHW 6 5 4 3 2 ...

Page 11: ...n valve actuator X X 5 Thermal safety relief valve 5a Pressure switch X X 6 Thermal safety thermostat X X 7 Heating flow temperature probe X X 8 Heating valve actuator X X 9 Earth X X 10 Pump X X 11 Electric supply 230 V ac X X 12 Room thermostat X X 13 Fuse X X Wiring to be made during installation Logic HIU Indirect HT 50 Logic HIU Indirect HT 50 INDIRECT ELECTRONIC CONNECTION EXTERNAL CUSTOMER ...

Page 12: ...lashes On Off when in operation NOTE when in standby the display will alternate every 5 second displaying the CH and the DHW temperatures 21 DISPLAYED ERROR CODES When an error occurs on these units the unit will stop functioning a flame and a RED light will show on the control box at the same time as a number relating to this fault will be displayed Heating pressure Fault Display Code 4 This is d...

Page 13: ...code 76 LOW temperature Should the operating temperature drop below the required 25 C as a result of a faulty safety valve the flashing fault LED on the electronic controller will appear and Error code 76 will be displayed Rectify this faults rectify the faulty safety valve if the fault does not automatically reset Activate the reset button on the control box The system should now function as norm...

Page 14: ... to modulate the heating flow circuit for greater efficiency and to compensate for changes in the external environment LOGIC HIU DIRECT HT Direct wall mounted HIU with a 50kW indirect instantaneous priority DHW and direct on off CH control Design The single plate design hydraulically separates the domestic water with the space heating supplied directly from the central primary supply The on board ...

Page 15: ...8 l m 0 3 l s Min flow rate to activate domestic flow sensor 2 7 l m 0 3 Max Differential pressure on domestic water modulating valve Δp 0 9 bar Min Differential pressure on domestic water modulating valve Δp 0 35 bar Heat exchanger capacity Nom DHW heat exchanger net output 50 kW Logic HIU Indirect 50 Optional Pre heat function Primary Performance Max Working pressure Primary circuit 10 bar Maxim...

Page 16: ...ry filter and heat meter probe pocket 5 Heating circuit on off valve 7 Modulating primary control valve DHW 8 Plate heat exchanger DHW 9 DHW temperature sensor 10 DHW flow switch 11 Electronic control unit 12 Room controller not supplied 13 Heating flow temperature sensor 14 Temperature control stat 17 Pump safety bypass and DP switch 18 Pump 19 Modulating heating control valve 20 Differential pre...

Page 17: ... Kv 2 20 m3 h Δ H m c a H m c a p bar 3 3 5 G m3 h 0 6 0 4 0 3 0 2 0 1 0 2 5 2 1 5 0 5 0 5 1 6 4 3 2 1 5 7 0 7 0 8 8 20 20 5 13 14 19 17 LOGIC HIU Installation Servicing Users 28 UPM3 AUTO L HEATING FLOW HEATING RETURN HEATING FLOW HEATING RETURN Flowrate l s COMMON HEATING SYSTEM Pressure loss kPa Flowrate l s Pressure loss kPa COMMON HEATING SYSTEM ...

Page 18: ...TS 31 DOMESTIC HOT WATER OUTPUT PRIMARY FLOW PATH Primary Flow Rate l h HEATING FLOW HEATING RETURN Domestic Hot Water Flow Rate 48 C l h 18 LOGIC HIU Installation Servicing Users Kv 2 25 m3 h Flowrate l s Pressure loss kPa 5 5 º C 85ºC 80ºC 75ºC 70ºC 65ºC 60ºC COMMON HEATING SYSTEM ...

Page 19: ...rn screw driver slot horizontal to bypass Turn Vertical to connect the HIU to the primary circuit 33 PRIMARY BALL VALVE SET Flow Control Valves with sample points Inc sealing washer to appliance CONTENT Item Qty Component 1 2 16 Bar primary inlet ball valves with integrated pressure sampling points BSP Union connection x 1 BSP ball valve with union end and male threaded connection joint 2 2 Rubber...

Page 20: ...e hazardous operational conditions To modify the factory settings and enable the HIU to support LOW temperature systems 25 to 45 C proceed as follows Electronic Control Dip Switch Settings Factory Settings Setting Capability Production settings Type Heating DHW Heating DHW 6 5 4 3 2 1 Logic HIU Direct MT 75 54 50 to 75 42 to 60 ON Logic HIU Direct HT 85 54 Max 85 42 to 60 ON Underfloor Low Temp Se...

Page 21: ...al safety relief valve 5a Pressure switch 6 Pressure gauge CH 7 Heating flow temperature probe X X 8 Heating valve actuator X X 9 Earth X X 10 Pump X 11 Electric supply 230 V ac X X 12 Room thermostat X X 13 Fuse X X Wiring to be made during installation Logic HIU Direct MT Logic HIU Direct HT DIRECT ELECTRONIC CONNECTION 21 LOGIC HIU Installation Servicing Users EXTERNAL CUSTOMER WIRING MUST be v...

Page 22: ... when setting and displaying Flashes On Off when in operation Actual Domestic Hot Water DHW Set Point Temperature Value display permanently when in use or been set Radiator Symbol On when setting and displaying Flashes On Off when in operation NOTE when in standby the display will alternate every 5 second displaying the CH and the DHW temperatures 42 DOMESTIC WATER GENERATION DHW PREHEATING FUNCTI...

Page 23: ...mber relating to this fault will be displayed Central Heating outlet temperature probe fault If the heating probe fails the heating will cease immediately The domestic water generation will not be affected The probe fault is indicated by a flashing fault LED on the electronic controller and the fault code 5 will be displayed Domestic Hot water outlet temperature probe fault If the domestic water t...

Page 24: ...scharge pipework in accordance to the local by laws Electrical 1 Electric supply line 230 V ac 50 Hz 2 Time clock thermostat line potential free 3 Centralised bus line for heat meter data transmission if required 4 Centralised electric supply line for heat meter if required The whole system should be thoroughly flushed to remove any debris that may be in the supply pipework to the HIU and to the d...

Page 25: ...1 Check for leaks 12 After the primary feed system has been correctly purged Check to ensure to ensure the pressure is not greater than the maximum pressure specified for these units and the system does not leak 13 Open the Primary flow slowly 14 Open the Primary return 15 If no leaks are present turn on the electrical supply to the unit This will activate the control valves and allow the primary ...

Page 26: ...cuit To clean these strainers carry out the following maintenance procedure Isolate electrics and primary valves Drain primary legs Unscrew the cap B Remove the st rainer mesh flush thoroughly with clean water to remove debris Replace the strainer mesh check the ring seal Screw the cap back into position check for leak Turn on electric and valves B 55 TEMPERATURE PROBE REPLACEMENT Disconnect the p...

Page 27: ...nd remove the cartridge H Remove any impurities present or change the cartridge if necessary and check flow turbine and saeling washer Screw in the cartridge Reposition the flow sensor and connection When carrying out maintenance on the electrical system for the connections follow the diagram on p11 Indirect and p21 Direct After concluding maintenance refill the system and check the operations des...

Page 28: ...viced exchanger partly clogged call qualified personnel to have it serviced modulating valve actuator faulty call qualified personnel to have it replaced valve obturator blocked in intermediate position call qualified personnel to have it replaced modulating valve actuator connector disconnected reconnect actuator connector DHW temperature probe cable inverted with heating probe restore correct co...

Page 29: ...system temperature insufficient contact person in charge of system electronic controller not working call qualified personnel to have it replaced primary circuit flow rate insufficient contact person in charge of system centralised system not worlcing contact person in charge of system CH LED off timer thermostat time setting incorrect check programming of timer thermostat timer thermostat not wor...

Page 30: ...NOTES 30 LOGIC HIU Installation Servicing Users ...

Page 31: ...NOTES 31 LOGIC HIU Installation Servicing Users ...

Page 32: ...al is a trademark of Ideal Boilers Registered Office Ideal Boilers Ltd PO Box 103 National Avenue Kingston Upon Hull HU5 4JN Tel 01482 492251 Fax 01482 448858 Registration No London 322 137 Logic HIU Customer Support Helpline 01482 440237 www idealcommercialboilers com Ideal Boilers Ltd pursues a policy of continuing improvement in the design and performance of its products The right is therefore ...

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