D-EOMHP00607-14EN - 1/66
Table of Content
Introduction ........................................................................................................................................... 5
1.1 Controller Features ............................................................................................................................ 6
2 System Outline ............................................................................................................................... 7
2.1 Communication components ............................................................................................................. 7
2.2 Unit I/O Mapping................................................................................................................................ 7
2.3 Unit Mode .......................................................................................................................................... 9
3 Unit Functions ................................................................................................................................ 9
3.1 HEAT, the Unit Mode ......................................................................................................................... 9
3.2 HEAT / COOL w/GLYCOL the Unit Mode ............................................................................................ 9
3.3 HEAT / ICE w/GLYCOL the Unit Mode ................................................................................................ 9
3.4 Calculations ........................................................................................................................................ 9
3.4.1 Evaporator Delta T ...................................................................................................................... 9
3.4.2 LWT Slope ................................................................................................................................. 10
3.4.3 Pull-down Rate.......................................................................................................................... 10
3.4.4 LWT Error .................................................................................................................................. 10
3.4.5 Unit Capacity ............................................................................................................................. 10
3.4.6 Control Band ............................................................................................................................. 10
3.4.7 Staging Temperatures ............................................................................................................... 10
3.5 Unit States ........................................................................................................................................ 11
3.6 Unit Status ........................................................................................................................................ 11
3.7 Power Up Start Delay ....................................................................................................................... 12
3.8 Evaporator Pump Control................................................................................................................. 12
3.9 Evaporator Pump configuration ....................................................................................................... 13
3.9.1 Primary/Standby Pump Staging ................................................................................................ 13
3.9.2 Auto Control ............................................................................................................................. 13
3.10 LWT Target ....................................................................................................................................... 13
3.10.1 Leaving Water Temperature (LWT) Reset ................................................................................ 13
3.10.2 Leaving Water Temperature (LWT) Override ........................................................................... 14
3.10.3 4-20mA Reset ........................................................................................................................... 14
3.10.4 OAT Reset ................................................................................................................................. 14
3.11 Unit Capacity Control ....................................................................................................................... 15
3.11.1 Compressor Staging in Cool Mode ........................................................................................... 15
3.11.2 Compressor Staging in Heat Mode ........................................................................................... 15
3.11.3 Compressors Staging Delay ...................................................................................................... 15
