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IDEAL LOGIC HIU Direct MT Installation And Servicing

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INSTALLATION AND
SERVICING
LOGIC HIU (Heat Interface Unit)
Indirect 75
Indirect 50
Direct MT
Direct HT
When replacing any part on this appliance, use only spare parts that you can be assured 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

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Summary of Contents for IDEAL LOGIC HIU Direct MT

  • Page 1 When replacing any part on this appliance, use only spare parts that you can be assured 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.

  • Page 2: Table Of Contents

    211353 Displayed Error Codes ......... 12 to 13 (+ CF ULTRAMAX X V PS Meter) Logic HIU Direct MT & Logic HIU Direct HT ..14 to 23 Health & Safety Document No. 635. Specification Direct ............14 (The electrical at work regulations 1989). The manufacturer’s Technical Specification ..........
  • Page 3 GENERAL SAFETY • When connecting water pipes, make sure that threaded connections are not mechanically overstressed. Over time this These instructions need to be read and understood before may result in breakage, causing water damage and/or personal installing or maintaining these units. FAILURE TO FOLLOW injury.
  • Page 4 INDIRECT SPECIFICATION 1 APPLIANCE TYPE INDIRECT LOGIC HIU INDIRECT 50 LOGIC HIU INDIRECT 75 Indirect wall mounted HIU, with a 50kW instantaneous priority Indirect wall mounted HIU, with a 75kW instantaneous priority DHW and 15 kW modulated CH. This can be converted to DHW and 15 kW modulated CH.

  • Page 5: Technical Specification

    INDIRECT SPECIFICATION 2 TECHNICAL SPECIFICATION LOGIC HIU INDIRECT 75, LOGIC HIU INDIRECT 50 OPERATION Heating Heat exchanger capacity: The temperature setting operates on the principle of set point Nom. DHW heat exchanger net output: 50 kW - regulation and can be fixed within application limits. Logic HIU Indirect 50 Heating Set Point: 25 to 75°C Nom.
  • Page 6 INDIRECT SPECIFICATION 3 ITEM COMPONENT REFERENCE: LOGIC HIU INDIRECT 75, LOGIC HIU INDIRECT 50 1 Primary isolation valve (incorporating pressure test points) 14 Heating flow temperature sensor 2 Drain cock 15 Temperature control stat 3 Heat meter spacer piece - replaced by heat meter when fitted 16 Strainer (heating circuit) 4 Primary filter and heat meter probe pocket 17 Pump safety bypass and DP switch...
  • Page 7 INDIRECT SPECIFICATION 5 SCHEMATIC LOGIC HIU INDIRECT 75 & LOGIC HIU INDIRECT 50 COMMON 6 PRIMARY FLOW CHARACTERISTICS FLOW PATH HEATING Heating Primary Circuit SYSTEM Kv = 2.03 m R ES ET ON DH W C H F AU LT Flowrate - l/s COMMON 7 PRIMARY FLOW CHARACTERISTICS...
  • Page 8 INDIRECT SPECIFICATION 8 HEATING FLOW CHARACTERISTICS FOR LOGIC HIU INDIRECT 75 & 50 HEATING SECONDRY FLOW CHARACTERISTICS LOGIC HIU INDIRECT 50 & 75 Δ p (bar) H (m c.a.) H (m c.a.) COMMON HEATING SYSTEM R ES ET ON DH W C H F AU LT G (m Flowrate - l/s HEATING...
  • Page 9 INDIRECT HARDWARE CONTENTS 10 LOGIC HIU INDIRECT 50 OR LOGIC HIU INDIRECT 75 11 PRIMARY BALL VALVE SET Flow & Control Valves (with sample points). (Inc. sealing washer to appliance) CONTENT Item Qty Component 16 Bar primary inlet ball valves with integrated pressure sampling points ¾” BSP Union connection x ¾”...

  • Page 10: Electronic Control System

    INDIRECT ELECTRONIC CONTROL 15 ELECTRONIC CONTROLLER Automatic controller functions LOGIC HIU INDIRECT 50 & 75 KW UNITS All the heating and domestic hot water functions offered by the Reset mixing/modulating valve to zero - Immediately after the Logic Indirect HIUs are controlled by a digital controller. power supply has been switched on, the position of the mixing/ modulating valves is reset to zero.
  • Page 11 INDIRECT ELECTRONIC CONNECTION 17 ELECTRICAL WIRING DHW temperature probe DHW Priority flow meter Flow temp. compensation return probe DHW production valve actuator Thermal safety relief valve Pressure switch Thermal safety thermostat Heating flow temperature probe 6 5 4 3 2 1 Heating valve actuator Earth Pump...

  • Page 12: Displayed Error Codes

    INDIRECT OPERATION 18 THE USER INTERFACE 21 DISPLAYED ERROR CODES The user interface built into the controls consists of:- Commissioning set up potentiometers (found at the top When an error occurs on these units, the unit will stop functioning right hand side of the control unit under a rubber cover a flame and a RED light will show on the control box at the same Customer unit rest button and a 4 LED light display.
  • Page 13 INDIRECT OPERATION 22 CONTINUED 22 OPTIONAL LOW CH Temperature operation ONLY. Where the low temperature (Underfloor heating) mode is active. Safety valve fault - Error 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.
  • Page 14 Similar to the indirect version, additional features. The Logic HIU Direct HT can be set to the Logic HIU Direct MT can be set to modulate the heating turn the primary demand on & off to compensate for changes flow circuit for greater efficiency and to compensate for in the external environment.

  • Page 15: Logic Hiu Direct Mt & Logic Hiu Direct Ht

    Max. Working pressure: Primary circuit: 10 bar regulation and can be fixed within application limits. Maximum temperature: 85°C Heating Set Point (Logic HIU Direct MT): 45 to 65°C Medium: Water Heating Set Point (Logic HIU Direct HT): Function not available Max.

  • Page 16: Technical Specification

    DIRECT SPECIFICATION 25 ITEM COMPONENT REFERENCE: LOGIC HIU DIRECT MT & LOGIC HIU DIRECT HT 1 Primary isolation valve (incorporating pressure test points) 11 Electronic control unit 2 Drain cock 12 Room controller (not supplied)* 3 Heat meter spacer piece - replaced by heat meter...
  • Page 17 DIRECT SPECIFICATION 27 SCHEMATIC LOGIC LOGIC HIU DIRECT 50 MT LOGIC HIU DIRECT 50 HT 28 UPM3 AUTO L COMMON HEATING SYSTEM Δ p (bar) H (m c.a.) H (m c.a.) G (m HEATING HEATING Flowrate - l/s FLOW RETURN 29 PRIMARY FLOW CHARACTERISTICS HEATING (CH) LOGIC HIU DIRECT 50 HT COMMON...
  • Page 18 DIRECT SPECIFICATION 30 HYDRAULIC CHARACTERISTICS DHW - HEAT EXCHANGER 50 MT & HT UNITS PRIMARY FLOW PATH COMMON Kv = 2.25 m HEATING SYSTEM HEATING HEATING Flowrate - l/s FLOW RETURN 31 DOMESTIC HOT WATER OUTPUT Domestic Hot Water Flow Rate @ 48°C - l/h LOGIC HIU - Installation &...
  • Page 19 DIRECT HARDWARE CONTENTS 32 LOGIC HIU DIRECT 50 MT OR LOGIC HIU DIRECT 50 HT 33 PRIMARY BALL VALVE SET Flow & Control Valves (with sample points). (Inc. sealing washer to appliance) CONTENT Item Qty Component 16 Bar primary inlet ball valves with integrated pressure sampling points ¾” BSP Union connection x 1”...
  • Page 20 Factory Settings Setting Capability Production settings Underfloor Low Temp Settings Dip Switch Settings Type Heating Heating Logic HIU Direct MT 50 to 75 42 to 60 Logic HIU Direct HT Max 85 42 to 60 OPTION Indirect only Do not change...
  • Page 21 ELECTRONIC CONNECTION DIRECT 38 ELECTRICAL WIRING DHW temperature probe DHW Priority flow meter Flow temp. compensation return probe DHW production valve actuator Thermal safety relief valve Pressure switch Pressure gauge CH Heating flow temperature probe 6 5 4 3 2 1 Heating valve actuator Earth Pump...
  • Page 22 DIRECT INSTALLATION OPERATION 39 THE USER INTERFACE 41 DISPLAY (MT ONLY) The user interface built into the controls consists of:- Actual Central heating (CH) Set Point Temperature Value display permanently Commissioning set up potentiometers (found at the top when in use or been set. right hand side of the control unit under a rubber cover Radiator Symbol On when setting and Customer unit rest button and a 4 LED light display.

  • Page 23: Displayed Error Codes

    DIRECT OPERATION 44 DISPLAYED ERROR CODES 45 DISPLAYED ERROR CODES When an error occurs on these units, the unit will stop Domestic water generation: DHW preheating functioning and display a RED light on the control box. At the same time a number relating to this fault will be displayed. function The function is enabled by setting dip switch 5 to the ON Central Heating outlet temperature probe fault...

  • Page 24: Installation

    We recommend that all connections ancillary equipment supplied in kit form by Ideal Boilers. The are fitted with isolation valves to allow any maintenance HIU must not be fitted outside.

  • Page 25: Commissioning

    INSTALLATION 50 COMMISSIONING 50 COMMISSIONING CONTINUED 23. Fit the case on to the unit. Hook the top taps in the cut outs FILLING THE CENTRAL HEATING SYSTEM provide (top left & right) and fit fixing screws through the case fixing tabs and the mounting case (bottom left and Check all the pipework and electrical connections are right) Ensure access doors are functional and operational.

  • Page 26: Maintenance

    MAINTENANCE 52 MAINTENANCE 55 TEMPERATURE PROBE REPLACEMENT All maintenance procedures should be carried out by an authorised technician. • Disconnect the probe cable, lightly folding the tab (C) and extracting the connector Regular maintenance guarantees better efficiency and helps to •...
  • Page 27 After concluding maintenance, refill the system and check the operations described in the chapter “Commissioning” and re-fit the cover. For information regarding spare parts or other technical information, please contact Ideal. Only genuine Ideal replacement components should be used. LOGIC HIU - Installation & Servicing / Users...
  • Page 28 FAULT FINDING 60 FAULT FINDING Fault Indications Possible Cause of Fault Operations to be Performed primary circuit isolating valve closed open the isolating valve modulating valve actuator connector disconnected reconnect actuator connector modulating valve actuator disconnected from reconnect actuator valve body modulating valve actuator faulty call qualified personnel to have it replaced DHW LED on...
  • Page 29 FAULT FINDING 61 FAULT FINDING Fault Indications Possible Cause of Fault Operations to be Performed 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...
  • Page 30 NOTES LOGIC HIU - Installation & Servicing / Users...
  • Page 31 NOTES LOGIC HIU - Installation & Servicing / Users...
  • Page 32 For details of courses please ring: ... 01482 498432 Ideal Boilers Ltd. pursues a policy of continuing improvement in the design and performance of its products. The right is therefore reserved to vary specification without notice.

This manual is also suitable for:

Logic hiu direct htLogic hiu indirect 50Logic hiu indirect 75

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