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Summary of Contents for Lennox LXRCC20
- Page 1 Application guide LXRCC20 Remote control Providing indoor climate comfort LXRCC20-AGU-0509-E...
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Page 3: Room Temperature Controller
Room Temperature LXRCC20 Controller for two-pipe fan coil units with electrical heater Outputs for on / off valve actuator and electrical heater Output for three-speed fan Control depending on the room or return air temperature Automatic heating / cooling changeover... -
Page 4: Automatic Changeover
Functions The controller acquires the room temperature with its integrated sensor or external room temperature sensor (QAA32) or external return air temperature sensor (QAH11.1) – if used – and maintains the setpoint by delivering control commands to the 2-point- valve. The switching differential can be 1 or 4 K in heating mode and 0.5 or 2 K in cool- ing mode. - Page 5 Heating mode Cooling mode Automatic changeover T [°C] T [°C] [°C] Cooling mode Water temperature Heating mode Room temperature setpoint Operating mode Manipulated variable “Valve“ Switching differential “Cooling“ Room temperature Switching differential “Heating“ Purging function The task of the changeover sensor is to initiate the change from heating to cooling mode even if the two-port valves are shut down for a longer period of time.
- Page 6 Cooling mode (chilled water) (DIP switch no.8 = OFF) T [°C] ½ SDC ½ SDC T[°C] Room temperature Room temperature setpoint Manipulated variable«Valve» Y21 Manipulated variable «Electric heating» SDH Switching differential ”Heating” Setpoint differential Xdz Dead zone SDC Switching differential ”Cooling” Energy saver The room temperature setpoint can be limited in increments of 1 K by making use of the minimum and maximum limitation facility.
- Page 7 Equipment combinations Type of unit Type reference Data sheet Temperature sensor QAH11.1 1840 Room sensor QAA32 1747 Changeover mounting kit ARG86.3 1840 Motoric on/off actuator SFA21... 4863 Thermal actuator (for radiator valve) STA21... 4893 Thermal actuator (for small valve 2,5 mm) STP21...
- Page 8 Dead zone in normal op- eration Setpoint differential Electrical heater Active in cooling mode Inactive in cooling mode Factory setting Accessories Description Type reference Adapter plate 120 x 120 mm for 4“ x 4“ conduit boxes ARG70 Adapter plate 96 x 120 mm for 2“ x 4“ conduit boxes ARG70.1 Adapter plate for surface wiring 112x130 mm ARG70.2...
- Page 9 Technical data Operating voltage AC 230 V + 10/-15 % Power supply Frequency 50/60 Hz Power consumption max. 6 VA Control outputs Q1, Q2, Q3 AC 230 V Rating max. 600 VA Control output Y11 (N.O. contact) AC 230 V Rating max.
- Page 10 Electromagnetic compatibility Emissions EN 50 081-1 Immunity EN 50 082-1 Safety class II to EN 60 730 Pollution class normal Degree of protection of housing IP30 to EN 60 529 Connection terminals Use solid wires or prepared General stranded wires. 2 x 0.4-1.5 mm or 1 x 2.5 mm Weight...
- Page 12 LENNOX DISTRIBUTION +33.4.72.23.20.00 info.dist@lennoxeurope.com Due to Lennox’s ongoing commitment to quality, the Specifications, Ratings and Dimensions are subject to change without notice and without incurring liability. Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury.
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