HIU compactINDIRECT, compact residential unit, hydraulic interface unit for
hot water production by continuous flow principle and transfer of heat to low-
temperature heating. Installation as flush mounted version with flush box or as
surface-mounted version with cover. The pipe connection to the residential unit
hydraulic interface unit is created using a patented installation system with pre-
installation bracket. Option to connect the pre-installation bracket from the floor.
Consisting of:
• Copper-soldered asymmetrical stainless steel plate heat exchanger
• Second heat exchanger for system separation on the secondary heating circuit
•HERZ pressure and temperature controller for central regulation of the hot water
temperature
•Fixed value control with setting range 20°C – 50°C consisting of zone valve,
thermostat with contact sensor, safety thermostat and circulating pump
•Constant readiness for hot water production even in summer, operating mode
due to temperature-regulated bypass switching, permanently set to 45°C
• Cold water meter adapter 80 mm – G 3/4" made of dezincification-resistant brass,
also suitable for continuous operation
• Heat meter adapter 110 mm – G 3/4" made of dezincification-resistant brass, also
suitable for continuous operation
• Diaphragm expansion tank secondary
• Diaphragm safety valve 3 bar secondary
• Strainer with fine mesh in primary supply line
• Strainer with fine mesh in secondary return line
• Differential pressure controller with integrated control valve, shut off
valve and zone valve in the secondary circuit
• Differential pressure controller (25 - 60 kPa) in the primary circuit
• Empty weight module: 27 kg
• Connection: Male thread 3/4" flat sealing
• Nominal pressure: 16 bar primary / 3 bar secondary
• Max. supply temp. HIU compactINDIRECT: 70 °C
• Max. supply temp. HIU compactINDIRECT with TSR*: 85 °C
• Min. flow pressure mains cold water: 2,8 bar
• Circulation pump space heating: Wilo Para RS 15/6 (SCU) or similar
• Circulation pump domestic hot water circulation: Wilo Star-Z NOVA or similar
11 l/min
• HIU compactINDIRECT without TSR*: 1402138
• HIU compactINDIRECT with TSR*: 1402135
• Domestic hot water circulation set: 1402473
• Flush cabinet short, 120 mm deep: 1402451
• Front frame with door short: 1402452
• Cover HIU compactINDIRECT: 1402457
• Pre-assembly strip HIU compactINDIRECT: 1402449
• Adapter piece for heat meter sensor M 10 x 1 mm: 1402246