Demir Dokum HK 50 M Service Bulletin
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HK 50 M – HK 10M – HK 100S SERVICE BULLETIN7.6. GAS CONNECTIONS- The device works with natural gas or LPG. Gas connections must be made in accordance with the relevantstandards. Following points must be observed before making connection:- The device to be connected and the gas type must be the same.- Connection pipes must be clean and not obstructed.- Gas connection pipes must be the same size or larger than the gas inlet (3/4"); the pressure dropduring this time must be less than the pressure drop between the gas line and the device.- After gas connections have been made, it must be checked that there are no leaks at the joints.- A suitable filter should be mounted on the gas inlet.- Make sure the gas valve or valves are open.- Use the correct gas for the unit (In LPG applications, LPG set must be installed in the device).7.7 ELECTRICAL CONNECTIONThe device comes with an electric power cord. In operations such as connection to electronic cardsthe power cable of the device must be disconnected from the wall outlet. For electrical connections:- Turn off the electricity to the device (A)- Remove the lower panel of the appliance and remove the front panel as shown in the figure. (B)- Open the instrument control panel forwards. (C)- Disconnect the control panel connections to access the electronic card of the device. (D)Make the required room thermostat, outdoor air sensor etc. connections according to the detailed electroniccard.Only the room thermostat(s), outdoor air sensor's and the pumps are connected to the correspondingterminals on the card.The HK 100 S models also have a communication cable.(Bus cable) relevant connections points are shown on the master card.The elements on the HK 50- HK 100 Master cardPB : Boiler pump terminal terminals (28-27)PZ 1 : High-temperature system pump terminals (26-25)PZ 2 : Recirculation or Pbas –Low temperature system pump terminals (24-23)VM : 3-way mixing valve terminals (22-21-20)Alarm signal terminals ( 19-18)SZ1 : High temperature system (zone) sensor terminals 1 (1-2)SB : Boiler (domestic water) sensor terminals (3-4)SZ2 : Low temperature system (zone) sensor terminals 1 (5-6)SE : Outdoor air sensor terminal (7-8) |
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