Installation and maintenance Filling and purging the domestic hot water system ..............29 instructions Check and gas setting ......... 29 Checking the heating mode ......... 32 Contents Checking the domestic hot water generation ..32 Checking leak-tightness ........32 Safety ..............3 9.10 Thoroughly flushing the heating installation Intended use ............
Safety Qualification The person carrying out the work described Intended use here must have completed professional train- The product is intended as a heat gener- ing. The competent person must demon- ator for open heating installations and for do- strably have all of the knowledge, skills and mestic hot water generation.
Page 4
▶ Do not use any electrical switches, mains To ensure that the combustion air supply is plugs, doorbells, telephones or other com- sufficient during open-flued operation: munication systems in the building. ▶ Ensure that the air supply to the product's ▶...
1.3.7 High temperatures To prevent burns: You can find a list of relevant standards at: ▶ Only carry out work on components once https://www.glow-worm.co.uk/standards they have cooled down. To prevent material damage that is caused by heat transfer: ▶ Only solder connectors if the connectors are not yet screwed to the service valves.
To register your Glow-worm appliance visit: https://self-service.glow-worm.co.uk/warranty-registration Glow-worm is a licensed member of the Benchmark Scheme. Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s instructions by a competent person approved at the time...
Technical data Technical data – General 24c-AS/1 (H-GB) 28c-AS/1 (H-GB) Designated country (designation in accordance with ISO 3166) GB, IE GB, IE Permissible gas categories ll2H3P ll2H3P CE number 0063CU3005 0063CU3005 92 % 93 % Product-side gas connection 1/2" 1/2" Product-side flow/return heating connections 3/4"...
Page 8
24c-AS/1 (P-GB) 28c-AS/1 (P-GB) Nominal efficiency in partial load mode (30%) 104.3 % 105.5 % NOx class Nitrogen oxide emissions, NOx weighted (Hs) (G20) 19.54 mg/kW⋅h 18.39 mg/kW⋅h CO emissions 140.2 ppm 141.3 ppm Net weight 25.6 kg 26.5 kg Technical data –...
Page 9
24c-AS/1 (H-GB) 28c-AS/1 (H-GB) Remaining pump head (at nominal circulation water volume) 0.027 MPa 0.017 MPa (0.270 bar) (0.170 bar) Contents of the heating expansion vessel 24c-AS/1 (P-GB) 28c-AS/1 (P-GB) Maximum heating flow temperature (factory setting – D.71) 75 ℃ 75 ℃...
Page 10
24c-AS/1 (P-GB) 28c-AS/1 (P-GB) Maximum electrical power consumption 90 W 90 W Standby electrical power consumption 1.7 W 1.7 W IP rating IPX5 IPX5 Installation and maintenance instructions Compact 0020313973_01...
Permissible operating pressure for do- Product article number mestic hot water mode Article num- Gas Council Heating mode Number Heat input range Compact 24c-AS/1 (H-GB) 0010040105 47-019-63 Nominal heat output range (75/55 °C) Compact 28c-AS/1 (H-GB) 0010040106 47-019-64 Condensing nominal heat output range...
Product design 5.5.2 Overheating Safety The boiler software is designed to recognise the potential for an overheat lockout and will shutdown before this happens. To restart the boiler, press the button more than 3s. If the boiler fails to resume normal operation and all external controls are calling for heat, then call your Installation/ Servi- cing company or Glow worm service.
Set-up Installation site If the boiler is to be installed in a timber frame building it Checking the scope of delivery should be fitted in accordance with the current version of the Institute of Gas Engineers document IGE/UP/7. If in doubt Quantity Designation seek advice from local gas undertaking or the manufacturer.
Air/flue pipe 6.5.1 Regulation Different flue outlet configurations can be carried out. – Consult the installation manual for air/flue gas systems for more information about the other possibilities and associated accessories. Minimum fall 44 mm/m – Standard flue terminal kits have an in-built fall back to the boiler to drain the condensate.
Page 15
6.5.2 Position of the air/flue terminal 6.5.2.1 Positioning the terminal of a fan-supported flue system Installation site Dimensions Adjacent to a boundary. 300 mm The dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is 25 mm extended to clear any overhang.
Page 16
Installation site Dimensions The dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is 25 mm extended to clear any overhang. External flue joints must be sealed with suitable silicon sealant. Above adjacent ground or balcony.
Page 17
6.5.3 Flue Configuration Description 6.5.3.2 Terminal protection 6.5.3.1 Horizontal Concentric Flue ⌀ 60/100 mm or ⌀ 80/125 mm (C13 type installation) A terminal guard is required if persons could come into con- tact with the terminal or the terminal could be subject to dam- age.
⌀ 60/100 Note 24c-AS/1 28c-AS/1 The flue connecting from the appliance to the flue Max. length (L) 10 m 10 m system must be supplied from the manufacturer of including 1 elbow including 1 elbow the boiler. Equivalence to 1 C43 flue systems must not be a 'pressurised sys- elbow 90°...
Note the total weight of the product. (→ Page 7) Only use fixing material that is permitted for the wall. – Screws with a minimum diameter of 6 mm If required, ensure that mounting apparatus on-site has sufficient load-bearing capacity. Wall-mount the product as described.
Installation Warning. Risk of adverse health effects caused by Danger! impurities in the potable water. Risk of scalding and/or risk of material Sealing residues, dirt or other residues in the damage due to incorrect installation lead- pipelines may adversely affect the quality of ing to escaping water.
Flushing the heating installation for the first Connecting the condensate discharge hose time ("cold") Danger! Note Risk of death from escaping flue gases! The complete heating system must be flushed The siphon's condensate discharge hose at least twice: Once with cold water and once must not be tightly connected to waste-water with hot water in accordance with the following pipework because, otherwise, the internal...
Page 22
7.5.2 Direct connection to external soil and vent 7.5.5 External termination into soakaway stack Ø32mm ≤ 3 m < 500 mm Ø22mm ≤ 3 m 100 mm Ø 32mm Ø12 7.5.3 External termination to gulley or hopper Ground (either/or) Bottom of sealed tube Seal Limestone chippings Plastic tube,...
7.5.7 External termination into rain water down Connecting the drain pipework for the pipe expansion relief valve ≤ 3 m Ø22mm Ø 32mm NB only combined foul/rainwater drain Ensure that the pipeline is visible. Connect the expansion relief valve (1) to a suitable 7.5.8 Additional methods of introducing air breaks discharge siphon.
– 7.9.2 Cable route The combustion air must not be taken from the install- ation site. ▶ Install the air/flue pipe using the set-up instructions. Electrical installation Only qualified electricians may carry out the electrical install- ation. The product must be earthed. Danger! Risk of death from electric shock! 230V...
Page 25
To avoid short circuits resulting from loose individual wires, fit conductor end sleeves on the stripped ends of the conductors. Screw the respective plug to the connection cable. Check whether all conductors are inserted mechanic- ally securely in the plug terminals. Remedy this if ne- cessary.
Page 26
Alternatives 4 ‒ Connecting the 230 V low voltage room temperature control: 230V~ ▶ Connect the control to the L main plug and to the RT plug. ▶ Remove the bridge from the 24V=RT plug. Close the electronics box. Installation and maintenance instructions Compact 0020313973_01...
Operation Calling up status codes Call up the installer level. (→ Page 27) Calling up the installer level to select the status codes S. menu. Press repeatedly until the symbol flashes. Confirm by pressing ◁ to set the competent person access The display alternates between the current status code, the current heating flow temperature and the code and confirm by pressing...
Start-up Total Water hardness at specific system volume heating > 20 l/kW output ≤ 20 l/kW During initial start-up, the operating data may initially deviate > 50 l/kW ≤ 50 l/kW from the specified nominal data. mol/ mol/ mol/ CaCO₃ m³...
Filling the heating installation Purging the heating installation Start the check programme P.00. (→ Page 27) Note Check programmes (→ Page 51) After each start-up, the product works at reduced ◁ on is shown in the display. output when starting in order to facilitate the heat transfer effect.
Page 30
Measure the gas flow rate at the gas meter. ▶ Compare the measured values with the corresponding values in the table. Turn the screw on the gas pressure measuring point Validity: Compact 24c-AS/1 (H-GB) OR Compact 24c-AS/1 (P-GB) (1) anti-clockwise. Qnw from – H gas in m³/h P gas in m³/h...
Page 31
▶ If the value is still outside of the permissible range, Caution. do not start up the product and, instead, report this Risk of material damage and oper- to customer service. ating faults caused by incorrect gas Result 2: connection pressure/gas flow pres- If the value is inside the permitted range: sure.
Note The actual reading on the digital pressure gauge should ideally be 0,05 MPa (0,5 bar) plus an additional pressure corresponding to the highest point of the system above the base of the boiler – 10 m head equals an additional 1 bar reading on the pressure gauge.
Page 33
10.1.2.2 Pump diagram - pressure loss graph (factory setting for the Qmax (ΔT = 20 °C) bypass valve) Validity: Compact 24c-AS/1 (H-GB) OR Compact 24c-AS/1 (P-GB) Installation volume flow in l/h Remaining pump head in hPa (mbar) 10.1.3 Setting the bypass valve Remove the front casing.
10.1.4 Setting the heating and domestic hot water temperature Condition: If installing a control is not intended ▶ Set the desired heating flow and domestic hot water tem- perature on the product (→ Operating instructions for the product). Condition: If installing a control is intended ▶...
12 Inspection and maintenance Compare the measured value with the corresponding value in the table. ▶ Adhere to the minimum inspection and maintenance in- Setting the CO₂ con- Removed Fitted front tervals. tent front casing casing ▶ Carry out maintenance work on the product at an earlier Natural gas H Natural gas H point if the results of the inspection that was carried out...
12.4 Moving the expansion vessel to the Use only new seals. maintenance position on the hydraulic block 12.5.2 Removing the compact thermal module Danger! Risk of death and risk of material damage caused by hot flue gas. The seal, insulating mat and self-locking nuts on the burner flange must not be damaged.
Page 37
12.5.3 Cleaning the heat exchanger Undo the four nuts (1) on the burner flange (2). Remove the entire compact thermal module (1) from Clean the heating coil (2) on the heat exchanger (4) the heat exchanger. using water or, if required, vinegar (to a maximum of 5% acid).
Page 38
Result: Connect the gas pipe using a new seal. Open the gas stopcock. Insulating mat damaged ▶ Check the product for tightness. (→ Page 32) Replace the insulating mat (→ Spare parts instruc- tions for the burner flange insulating mat). Check the gas connection pressure/gas flow pressure.
Page 39
Ensure that the hole for the restrictor for the reference pressure pipe (1) is not blocked (E). Result: Hole for the restrictor for the reference pressure pipe is blocked ▶ Clean the hole by blowing it out using compressed air. Ensure that the reference pressure pipes (2) and (3) are not blocked.
▽ 13 Troubleshooting If the seal is no longer present or is damaged, re- place it. Fill the condensate siphon (E). 13.1 Querying the fault memory Reattach the condensate siphon. Call up the installer level. (→ Page 27) Connect the condensate discharge hose. to select the fault memory F.
Page 41
operation of the product. To receive information about the available original spare parts, contact the contact address provided on the back page of these instructions. ▶ If you require spare parts for maintenance or repair work, use only the spare parts that are permitted for the product.
14 Decommissioning 14.1 Temporary decommissioning Press the on/off button ◁ The display shows oF and then goes out. Close the gas stopcock. Disconnect the product from the mains power. 14.2 Permanently decommissioning Drain the product. (→ Page 40) Press the on/off button ◁...
Appendix Inspection and maintenance work The table below lists the manufacturer requirements with respect to minimum inspection and maintenance intervals. If na- tional regulations and directives require shorter inspection and maintenance intervals, you should observe these instead of the intervals listed. Each time inspection and maintenance work is carried out, carry out the required preparatory and com- pletion work.
Page 44
Values Factory Code Parameter Unit Increment, select, explanation setting Min. Max. ℃ – – d.06 Target domestic hot wa- Current value ter temperature – – d.08 Status of the 230 V room Current value OF = Open (0 V, no heating mode) thermostat on = Closed (230 V, heating mode) ℃...
Page 45
Values Factory Code Parameter Unit Increment, select, explanation setting Min. Max. – – d.35 3-port valve position Current value 0 = Heating 40 = Mid-position (frost protection or filling) Hi = Domestic hot water – – d.36 Value for the domestic Current value l/min hot water flow rate...
Values Factory Code Parameter Unit Increment, select, explanation setting Min. Max. – – d.93 Setting the product code Increment = 1 The Device Specific Number (DSN) can be found on the data plate. – – d.94 Delete fault list 0 = No 1 = Yes –...
Code Meaning S.76 A service message is activated. Check the water pressure. S.88 The purge programme is active. S.91 The exhibition mode is activated. S.96 The self-test for the return temperature sensor is activated. Heat demands are blocked. S.98 The self-test for the flow/return temperature sensor is activated. Heat demands are blocked. Fault codes Note Since the code table is used for various products, some codes may not be visible for the product in question.
Page 48
Code/meaning Possible cause Measure ▶ F.22 Cable for the pump/for the wa- Check the cable for the pump/for the water pressure sensor. ter pressure sensor is loose/not System pressure too low connected/defective ▶ F.23 Pump blocked Check that the pump is working correctly. ▶...
Page 49
Code/meaning Possible cause Measure F.29 Reference pressure pipe not Check whether the reference pressure pipe is connected connected between the gas valve assembly and the restrictor for the Ignition and check faults during reference pressure pipe. operation – flame has gone out Check whether the reference pressure pipe is connected between the restrictor for the reference pressure pipe and the distribution pipe.
Page 50
Code/meaning Possible cause Measure ▶ F.68 Air in the gas supply (e.g. dur- Reset the unit once. ing initial start-up) Fault: Unstable flame signal ▶ Gas flow pressure too low Check the gas flow pressure. ▶ Incorrect air ratio Check the CO content at the flue gas analysis point.
Code/meaning Possible cause Measure ▶ F.86 The flow temperature sensor Check the flow temperature sensor. measures deviating values External safety shutdown ▶ 3-port diverter valve blocked Check the 3-port diverter valve. ▶ Condensate pump defective Replace the condensate pump. ▶ F.87 Igniter not connected Check the igniter's connection.
Wiring diagram Burner off X106 RT 24V eBUS eBUS – Burner 24V= 230V~ RT 230Vac 230Vac Main PCB Heating flow temperature sensor PCB for the control element Heating return temperature sensor Limit thermostat with contact for underfloor heating, Burner off Gas valve assembly (optional) Prioritising diverter valve...
Commissioning Checklist Benchmark Commissioning & Warranty Validation Service Record It is a requirement that the boiler is installed and commissioned to the manufacturers’ instructions and the data fields on the commissioning checklist completed in full. To instigate the boiler warranty the boiler needs to be registered with the manufacturer within one month of the installation.
Page 54
GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT NAME): Gas Safe registration number: Company name: Telephone number: Company email: Company address: Commissioning date: Heating and hot water system complies with the appropriate Building Regulations? Time, temperature control and boiler interlock provided for central heating and hot water Boiler Plus requirements (tick the appropriate box(s)) Weather compensation...
Page 55
SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER SERVICE/INTERIM WORK ON BOILER Date:...
Page 56
SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER SERVICE/INTERIM WORK ON BOILER Date:...
Commissioning Flow Chart PRIOR TO CO AND COMBUSTION RATIO CHECK NOTE The boiler manufacturer’s installation instructions should have been followed, gas type verified and gas THE AIR GAS RATIO VALVE IS FACTORY supply pressure/rate checked as required prior to commissioning. SET AND MUST NOT BE ADJUSTED As part of the installation process, especially where a flue has been fitted by persons other than the DURING COMMISSIONING UNLESS THIS...
Need help?
Do you have a question about the Compact 24c-AS/1 and is the answer not in the manual?
Questions and answers