SystemAir HHFlex C, Operating Instructions Manual, Page: 3 / 47

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4.3 Fan speed control 22
4.3.1 Fixed Fan Speed Control 22
4.3.2 High / low speed operation 22
4.3.3 Air Flow Control 22
4.3.4 High / low air flow operation 22
4.3.5 Supply Duct Pressure Control 22
4.3.1 Supply and exhaust Duct Pressure Control 23
4.3.2 Indoor Air Quality Control 23
4.4 Heat Recovery Monitoring 23
4.4.1 Low Supply Air Temperature Monitoring 23
4.4.2 High Supply Air Temperature Monitoring 23
4.4.3 Frost Protection without Pre-Heating 23
4.5 Filter Monitoring equipped with a pressure sensor 24
4.1 Dry outdoor filter control equipped with a pre-heater 24
4.2 Occupancy Management 24
4.3 Stand alone mode 24
4.3.1 Internal Clock 24
4.3.2 Operation Time Extension 24
4.4 Remote mode 24
4.5 Building Fire Management 25
5 HHFlex – OPTIONAL CONTROL FUNCTIONS 25
5.1 Air Dampers 25
5.2 Hot-water reheating Coil 25
5.3 Water Coil Frost Protection (TA01) 26
5.4 Warm Up at Unit Start Up 26
5.5 Unit Frost Protection 26
5.6 Chilled-water Cooling Coil 26
5.6.1 Temperature Control 26
5.8 Change-over water Coil for Heating and Cooling 27
5.8.1 Heat/Cool Thermostat (TS01) 27
5.8.2 Temperature Control 27
5.8.3 Water Coil Frost Protection (TA05) 27
5.8.5 Warm Up at Unit Start Up 28
5.8.6 Unit Frost Protection 28
5.8.7 Defrost of heat-pump 28
5.8.8 Backup electric heater 28
5.9 Electrical reheating Coil 29
5.9.1 Temperature Control 29
5.9.2 Overheating protection (TA04) 29
5.9.3 Cool down at unit stop 29
5.10 Electrical pre-heating Coil 30
5.10.1 Heat Recovery Frost Protection 30
5.10.2 Overheating protection (TA03) 30
5.10.3 Cool down at unit stop 30
5.11 Hot water pre-heating Coil 31
5.11.1 Heat Recovery Frost Protection 31
5.11.2 Water Coil Frost Protection (TA01) 31
5.11.3 Warm Up at Unit Start Up 31
5.11.4 Unit Frost Protection 31
5.12 Direct-expansion coil 32
5.12.1 Condensing unit/reversible unit with staged capacity 32
5.12.2 Condensing unit/reversible unit with variable capacity 32
5.13 Water pump anti-blocking system 32