REMEHA GAHP-A Installation, User And Maintenance Manual
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REMEHA GAHP-A Installation, User And Maintenance Manual

REMEHA GAHP-A Installation, User And Maintenance Manual

Air-water gas absorption heat pump
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GAHP-A
air-water gas absorption heat pump
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Summary of Contents for REMEHA GAHP-A

  • Page 1 Installation, user and maintenance manual GAHP-A air-water gas absorption heat pump powered by natural gas and renewable energy...
  • Page 2 Revision: A Code: D-LBR637...

  • Page 3: Table Of Contents

    Installation, user and maintenance manual – GAHP-A Index of Contents sAfetY And sYMBoLs �����������������������������������������������������������������������������������4 SYMBOLS ......................................4 SAFETY ......................................4 oVeRVIeW And teCHnICAL feAtURes ��������������������������������������������������������8 Conformity to CE standards ..............................8 GENERAL FEATURES ..................................8 TECHNICAL DATA ..................................9 DIMENSIONS ....................................13 ELECTRICAL DIAGRAM OF THE APPLIANCE ........................18...

  • Page 4: Safety And Symbols

    And sYMBoLs This Installation, user and maintenance manual is a guide to the installation and opera- tion of the Air-Water gas absorption heat pump "GAHP-A". This manual is specifically intended for: • final users for the operation of the appliance according to their own requirements;...
  • Page 5 Installation, user and maintenance manual – GAHP-A The unit uses a water/ammonia absorption cycle for hot water production. The ammonia is in water solution inside a sealed circuit tested for tightness by the manufacturer. In case of refrigerant leaks, switch off the electrical power and gas supplies only if this can be done in total safety.
  • Page 6 The appliance has a sealed circuit classified as pressure equipment, i.e. with internal pres- sure higher than atmospheric pressure. The fluids contained in the sealed circuits are harmful if swallowed or inhaled, or if they come into contact with the skin. Do not carry out any operation on the sealed circuit or on its valves.
  • Page 7 Installation, user and maintenance manual – GAHP-A • shut off the appliance immediately (if possible and if no dangerous condition ex- ists) through the controls and wait for the end of the cooling down cycle (around 7 minutes); • immediately get in touch with Technical Assistance.

  • Page 8: Overview And Technical Features

    ) to produce hot water, using atmospheric air as renewable energy source. The water/ammonia thermodynamic cycle used in the unit GAHP-A is realized in a her- mitically sealed circuit, directly verified by the manufacturer to ensure the perfect tight- ness of all joints, thus making refrigerant top-ups completely unnecessary.

  • Page 9: Technical Data

    Installation, user and maintenance manual – GAHP-A • Air heat exchanger with single-row finned coil, manufactured with steel pipes and aluminium fins. • Automatic microprocessor-controlled two-ways defrosting valve. Control and safety components • S61 electronic board with integrated microprocessor, LCD display and control knob, complete with Mod10 auxiliary card to control thermal capacity and prima- ry pump modulation (see Figures 5.1 Electronic board S61 →...
  • Page 10 As an option, a version for operation down to -30 °C is available. Free field, frontal, directionality factor 2. PCI 29.25 MJ/m3 (1013 mbar – 15 ° C). table 2�2 – GAHP-A HT technical data GAHP-A HT S oPeRAtIon WHen HeAtInG G.U.E.
  • Page 11 Installation, user and maintenance manual – GAHP-A GAHP-A HT S maximum °C Ambient air temperature (dry bulb) minimum °C -20 (7) Thermal differential nominal °C methane G20 (nominal) m3/h 2,72 (3) methane G20 (MIN) m3/h 1,34 G25 (nominal) m3/h 3,16 (9)
  • Page 12 FILLING RATIO 0,146 NH3/l FLUID GROUP GROUP 1° table 2�4 – Network gas pressure e3-Gs; e3-Ws; e3-A; GAHP-Gs; GAHP-Ws; GAHP-A Gas supply pressure Product categories Countries of destination G20 [mbar] G25 [mbar] G30 [mbar] G31 [mbar] G25�1 [mbar]...

  • Page 13: Dimensions

    Installation, user and maintenance manual – GAHP-A 2�4 dIMensIons figure 2�1 – Dimensions (low noise version) Front and side views (dimensions in mm). figure 2�2 – Service plate LeGend Gas fitting Ø ¾” F Inlet water fitting Ø 1¼” F Outlet water fitting Ø...
  • Page 14 figure 2�3 – Internal components - left side view                                ...
  • Page 15 Installation, user and maintenance manual – GAHP-A figure 2�4 – Internal components - front view                         ...
  • Page 16 figure 2�5 – Internal components - right side view                                ...
  • Page 17 Installation, user and maintenance manual – GAHP-A table 2�5 – Internal components DESCRIPTION Manual reset of the flue exhaust thermostat Sensing element of the flue exhaust thermostat DN80 flue exhaust connection PT1000 flue exhaust temperature probe Flame sensing / ignition electrodes...

  • Page 18: Electrical Diagram Of The Appliance

    2�5 eLeCtRICAL dIAGRAM of tHe APPLIAnCe figure 2�6 – Wiring diagram of the unit with standard/ low noise fan (S)

  • Page 19: Transportation And Positioning

    Installation, user and maintenance manual – GAHP-A tRAnsPoRtAtIon And PosItIonInG LIftInG And PLACInG tHe APPLIAnCe Into PosItIon On receiving the appliance at the installation site, before placing into final position, check there are no signs of transportation damages of the external panels or packaging.
  • Page 20 • The front of the appliance must have a minimum clearance of 80 cm from walls or other fixed constructions; the right and left sides must have a minimum clear- ance of 45 cm; the minimum rear clearance from walls is 60 cm. (see Figure 3.2 Clearances →...
  • Page 21 Installation, user and maintenance manual – GAHP-A Place the appliance preferably far from environments where silence is required, such as bedrooms, meeting rooms, etc. Evaluate the noise impact of the appliance with respect to the installation site: avoid placing the appliance in locations (such as corners of buildings) where noise could be amplified (reverberation effect).

  • Page 22: Hydraulic Installation

    HYdRAULIC InstALLAtIon 4�1 GeneRAL InstALLAtIon PRInCIPLes Installation of the appliance may only be carried out by professionally qualified personnel by i.e. firms qualified according to the current legislation of the country of installation. "Professionally qualified personnel" means personnel with specific technical competence in the sector of heating/cooling installations and gas appliances.

  • Page 23: Hydraulic Connections

    Installation, user and maintenance manual – GAHP-A 4�2 HYdRAULIC ConneCtIons General indications The hydraulic installation may be realized using pipes in stainless steel, black steel, cop- per or crosslinked polyethylene for heating/cooling applications. All water pipes and pipe connections must be properly insulated in compliance with current regulations to prevent heat losses and outer condensation.

  • Page 24: Condensate Discharge

    The gas supply pressure must be in the range given in Table 2.4 Network gas pressure → 12. Supplying gas to the appliance at pressures higher than those indicated above can dam- age the gas valve, resulting in dangerous situations. LPG systems must be equipped with a first stage pressure reducer close to the LPG stor- age tank, in order to reduce the gas pressure to 1,5 bar, and a second stage pressure re- ducer, close to the unit, in order to reduce pression from 1,5 bar to the value correspond-...

  • Page 25: Water Quality

    Corrugated hose The condensate discharge to the sewer must be: • sized so as to discharge the maximum condensation flow (see Table 2.1 GAHP-A LT technical data → 9 or Table 2.2 GAHP-A HT technical data → 10); • made of materials resistant to acidity with pH 3 to 5;...
  • Page 26 The presence of free chlorine in the water, in particular, can jeopardize parts of the instal- lation and Remeha units. Therefore, please make sure that free chlorine content and total hardness are compliant with the allowable ranges reported in Table 4.1 Chemical and physical parameters of water →...
  • Page 27 (for calculation of internal pressure drops of the appliance, refer to the Table 2.1 GAHP-A LT technical data → 9 or Table 2.2 GAHP-A HT technical data → 10).

  • Page 28: Filling Of Hydraulic Circuit

    • then parameter 182 in menu 4 must be set to “1” (at the installer’s care). 4�6 fILLInG of HYdRAULIC CIRCUIt After having completed all hydraulic, gas and electrical connections, the installer can proceed filling the hydraulic circuit, observing the following steps: Activate the automatic air purging valves of the plant and open all thermostatic valves.
  • Page 29 Installation, user and maintenance manual – GAHP-A figure 4�3 – Fume outlet LeGend Curve 90° Ø 80 Pipe Ø 80 Lg.300 mm w/terminal rain cover...

  • Page 30: Electrical Installation

    eLeCtRICAL InstALLAtIon Before connecting power supply, the appliance must be placed in its final position. Before making electrical connections, make sure not to work on live elements. Electrical safety is ensured only when the appliance is correctly connected to an efficient grounding system, realized according to current safety regulations.

  • Page 31: Electrical Power Supply

    Installation, user and maintenance manual – GAHP-A CODE DESCRIPTION Fuse F 10A Fuse T 2A Fuse T 3.15A FAN (BK, WH, BR) Fan output FS5 (24V AC) Controller power 24-0-24 Vac IGN.BOX (L, N) Flame controller power 230 V AC CAN BUS jumper Jumper N.O.

  • Page 32: Wiring Of An On/Off Circulation Pump

    Connect power supply with the cable indicated at point 1, fitting close to the appli- ance a two-pole isolator switch with 3 mm distance between contacts (see detail «GS» in Figure 5.3 Electrical wiring diagram → 32) and two 5A fuses type T or a 10A magnetothermic breaker.
  • Page 33 Installation, user and maintenance manual – GAHP-A figure 5�4 – Electrical wiring diagram LeGend circuit board closed jumper N.O. CONTACT N.O voltage free contacts unit terminal block phase neutral Components NOT SUPPLIED water pump <700W Example of pump/appliance electrical connection with 230 Vac pump (with absorbed power of < 700 W), controlled directly by the appliance.
  • Page 34 If several appliances are connected on the same hydraulic circuit, it is always necessary to provide a safety transformer (SELV secondary) with relevant relay; make connections according to the diagram in Figure 5.6 Electrical wiring diagram → 35.
  • Page 35 Installation, user and maintenance manual – GAHP-A figure 5�6 – Electrical wiring diagram Example of pump/appliance electrical connection with 230 Vac pump, controlled directly by the appliance through a relay and a SELV safety transformer...

  • Page 36: Wiring Of A Modulating Pump

    5�3 WIRInG of A ModULAtInG PUMP In order to further optimize the operation of the appliance it is possible to use for the pri- mary circuit a modulating pump WILO STRATOS PARA (check Section ACCESSORIES → 66) for which the dedicated electronic card Mod10 has been developed. No other modulating pumps are supported.
  • Page 37 Installation, user and maintenance manual – GAHP-A figure 5�7 – Wiring diagram for connection of Wilo variable rate pumps LeGend Bipolar pump power switch Fuse Hot water circulation pump (primary circuit) Pump signal 0-10V wire colours brown connect to -ve...

  • Page 38: On/Off Permissive

    figure 5�8 – Wiring diagram for hooking up the Wilo variable rate pump powered by the unit LeGend Hot water circulation pump (primary circuit) Unit terminal block Pump signal 0-10V wire colours brown connect to -ve white connect to +ve black isolate blue isolate Wiring diagram for hooking up the Wilo variable rate pump powered by the unit...

  • Page 39: Can Bus Cable Connection

    Installation, user and maintenance manual – GAHP-A figure 5�9 – Electrical wiring diagram LeGend Electronic board Common Terminal consensus warming Components NOT SUPPLIED ON/OFF command switch electrical connections of ON/OFF command switch 5�5 CAn BUs CABLe ConneCtIon This paragraph describes how to connect one or more appliances to a controller through the CAN BUS cable.
  • Page 40 The following table gives details of some types of CAN BUS cables, grouped according to the maximum distance covered by each single type. table 5�2 – CAN BUS cables type CABLe nAMe sIGnAL / CoLoR MAx LenGtH note Honeywell sds 1620 BELDEN 3086A H= BLACK L= WHITE...
  • Page 41 Installation, user and maintenance manual – GAHP-A Pull back the shielding on the jacket; apply isolating tape to the end of the shield- ing as pulled back (detail A, Figure 5.11 CAN BUS cable connection → 40). terminal node of the network connect the three coloured If the appliance is a wires to the orange connector as shown in detail "A"...
  • Page 42 figure 5�13 LeGend S61 controller...

  • Page 43: How To Reset The Flame Controller From Remote

    Installation, user and maintenance manual – GAHP-A figure 5�14 LeGend S61 controller 5�6 HoW to Reset tHe fLAMe ContRoLLeR fRoM ReMote The flame controller reset can be controlled remotely by installing a button (not sup- plied) to the flame controller inside the unit’s electrical panel.
  • Page 44 Connect the button as instructed below. You will need: the appliance disconnected from the electricity supply The cable required to connect the reset button must be 3x0.75mm Cut a suitable length of cable. Connect the cable to the blind terminals A (see Figure 5.15 Button connection for flame controller reset →...
  • Page 45 Installation, user and maintenance manual – GAHP-A figure 5�15 – Button connection for flame controller reset...

  • Page 46: Commissioning And First Start

    CoMMIssIonInG And fIRst stARt UP Before proceeding with the operations described in this section, the installer is invited to read Paragraph 2.1 Conformity to CE standards → 8. Please refer to Paragraph 7.1 SWITCHING ON AND OFF → 52 for switching the appliance on and off. 6�1 PRoCedURe foR fIRst stARt UP The complete procedure for the first start up of the appliance must be carried out by an...
  • Page 47 Installation, user and maintenance manual – GAHP-A Plant conditions that are hazardous for people or for the appliance. If any of the follow- ing hazardous situations arises, the Technical Assistance must not carry out the "first start up": • appliance installed indoors;...
  • Page 48 table 6�1 – Menu 4 PARAMeteR desCRIPtIon settInG VALId RAnGe defAULt RAnGe UNIT ID CODE: unequivocally identifies each machine connected in a CAN network; it is to be set with a different The value to be set for this parameter is the For single unit = 0 4.40 0 to 478...
  • Page 49 Installation, user and maintenance manual – GAHP-A figure 6�1 – Gas valve LeGend Plug Key Torx TX40 screw adjustment CO2 gas pressure intake Gas valve Honeywell VK 4115V If the pressure measured by the pressure gage is not complying with the value re- ported in Table 2.4 Network gas pressure →...

  • Page 50: Change Of Gas Type

    example (G20 gas): if at point 4 a content of CO equal to 9.2% was detected, at point 6 there must be a value of (9.2%-0.4) with tolerance of +0.3 -0.0 on the delta value, i.e. a value in the range of 8.8-8.5%. →...
  • Page 51 Installation, user and maintenance manual – GAHP-A → 51) with those Replace the nozzle and o-ring C (see Figure 6.2 Gas changeover of the diameter suited to the new type of gas (see Table 6.2 Gas nozzles and con- tent of CO2 → 51). The nozzle code is stamped on the nozzle itself.

  • Page 52: Normal Operation

    noRMAL oPeRAtIon 7�1 sWItCHInG on And off Efficient operation and long life of the appliance depend largely on its correct use! Before activating the appliance, check that: • the gas valve is open; • the appliance is powered electrically: the general electrical switch (GS) must be in the «ON»...
  • Page 53 Installation, user and maintenance manual – GAHP-A figure 7�1 – On-board controller LeGend   4 digit display Knob  CAN port Mod10 controller   S61 + Mod10 description of menu of s61 controller The parameters and settings of the appliance are grouped in the menus shown on the controller’s display:...
  • Page 54 connected, have already been set during installation. In any case, to set new values for the parameters, see Paragraph Programming of hydraulic parameters. Menus 4, 5, 6 and 7 exclusively concern the installation technician and authorized Techni- cal Assistance. Menu 8 may currently be selected, but not used. display and knob Upon activation, all of the LEDs of the display light up for approximately three seconds, and then the name of the board, S61, appears.

  • Page 55: Operating Settings

    Installation, user and maintenance manual – GAHP-A turn the knob to scroll through content (menus, parameters, ac- In the same way: tions), press the knob to select/confirm the content (access a menu, display/set a parameter, execute an action, quit or return to the previous level). For example, to quit the menus, turn the knob to scroll through menus "0.", "1.", "2."...
  • Page 56 • Hot water thermostat control, parameter 160. This parameter takes two values: "0" and "1". Value "0" indicates that the appliance's "activation/deactivation" tempera- ture is to be read by the water probe at the appliance’s INTAKE. Value "1" indicates that the appliance’s "activation/deactivation" temperature is to be read by the wa- ter probe at the appliance’s OUTLET.

  • Page 57: Displaying And Resetting Operating Codes

    Installation, user and maintenance manual – GAHP-A To exit the menu, turn the knob clockwise until E is displayed, then press it to confirm. For details regarding the codes displayed by the appliance during operation, see Paragraph 1 OVERVIEW AND OPERATING CODES/TROUBLESHOOTING → 64.
  • Page 58 table 7�4 – Menu 2 ACtIon ReQUIRed foR exeCUtIon sHoWn on dIsPLAY As Reset flame controller arrest 2. 20 Reset other operating codes 2. 21 Manual defrost 2. 22 Timed forcing to minimum power 2. 23 Timed forcing to maximum power 2.

  • Page 59: Manual Di Defrosting

    Installation, user and maintenance manual – GAHP-A To quit the menu, turn the knob clockwise until the "2. E" is displayed. Now press the knob to return to menu selection: "2.". To exit the menu selection and return to the normal visualisation of the parameters of the appliance, turn the knob clockwise until "E"...
  • Page 60 In case of precence of glycol, Remeha advices to use inhibited glycol. Galvanized pipes are not recommended, as they are not compatible with glycol.
  • Page 61 Installation, user and maintenance manual – GAHP-A If no smell of gas is detected, connect the appliance to the electricity supply mains via the external circuit breaker provided by the installation technician in the ap- propriate panel (set the "GS" circuit breaker to the "ON" position, see Figure 5.3 Electrical wiring diagram →...

  • Page 62: Maintenance

    8�1 GUIdeLInes foR tHe PReVentIVe MAIntenACe oPeRAtIons Check of the unit GAHP-A GAHP-Gs/Ws GAHP-AR Visually check of the general condition of the unit and of its air heat exchanger. √...
  • Page 63 Installation, user and maintenance manual – GAHP-A If the unit is subject to particularly heavy duty (for example in process plants or in other conditions of continuous operation), these maintenance operations must be more frequent. table 8�2 sCHedULed MAIntenAnCe oPeRAtIons...

  • Page 64: Operating Codes/Troubleshooting

    oPeRAtInG Codes/tRoUBLesHootInG oVeRVIeW And oPeRAtInG Codes/tRoUBLesHootInG table 1 – TABLE OF OPERATING CODES generated by the S61 electronic board (firmware version 3.023) CODES DESCRIPTION TRIP CONDITIONS RESET METHOD FAULT ON RESET CIRCUIT OF FLAME E 400 Fault on reset circuit of flame control unit. Contact authorised Technical Assistance.
  • Page 65 Installation, user and maintenance manual – GAHP-A CODES DESCRIPTION TRIP CONDITIONS RESET METHOD Reset may be performed from the controller (or from the S61 board u_36 code generated three times in 1 hour of E 436 BLOWER FAULT via menu 2, parameter 21). If the code persists, contact authorised operation.

  • Page 66: Accessories

    ACCessoRIes This section contains a list of the accessories that are available for the installation and use of the appliance. table 1 – Accessories ACCessoRIes name description Code notes Variable rate pump for cold and Wilo-Stratos Para 25-11. O-PMP004 hot water. CIRCULATION PUMPS Pompa Wilo-Stratos Para 30-12 O-PMP008...

  • Page 67: Appendix

    Installation, user and maintenance manual – GAHP-A APPendIx sAfetY deVICes PResCRIBed BY tHe Ped The PED (Pressure Equipment Device) prescribes that the unit is supplied with a hermetic circuit safety valve (pos. B in the Figure 1 Main safety devices of the unit → 67).

  • Page 68: Additional Safety Devices

    inspect the component (if the valve must be replaced, refer to Paragraph 3 SAFETY VALVE REPLACEMENT OPERATIONS → 69); re-mount the front and upper panel of the unit. AddItIonAL sAfetY deVICes The following additional safety devices are installed on the appliance: •...

  • Page 69: Safety Valve Replacement Operations

    Installation, user and maintenance manual – GAHP-A figure 2 – Inspection at generator limit thermostat Thermostat detail sAfetY VALVe RePLACeMent oPeRAtIons This operation must be performed by professionally qualified staff. Before proceeding, visually check the integrity of the unit hermetic circuit.
  • Page 70 figure 4 – Detail of safety valve mounted on unit LeGend Safety valve Inspection valve Sealed circuit                        Description of components involved in the operation Stop the unit and wait for the end of the switch-off cycle.
  • Page 71 Installation, user and maintenance manual – GAHP-A figure 6 – Removal of safety valve               Removal of safety valve mobile part → 71. Replace the o-ring as indicated in Figure 7 o-ring figure 7 –...

  • Page 72: Non-Condensable Or Non-Absorbable Gases

    figure 9 – Inspection valve assembly LeGend hold in place  turn clockwise   Assembly of removable part Test for the absence of ammonia using a phenolphthalein test strip. Mount the unit upper panel. WARNING! DO NOT START THE APPLIANCE WITHOUT THE SAFETY VALVE. non-CondensABLe oR non-ABsoRBABLe GAses Indirect control of the presence of non-condensable or non-absorbable gas in the hermetic circuit or internal corrosion phenomena...
  • Page 73 Installation, user and maintenance manual – GAHP-A...
  • Page 74 Thank you for choosing this high efficiency product which is designed & manufactured to exacting standards to offer many years of service. Backed by a comprehensive warranty, in the unlikely event that you need after-sales attention our customer service centre of- fers full support &...

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