Stulz CeilAir CW - Page 5

5OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
CONTENTS
2.7.6.4 Remote Temperature Sensor (ATech)
................................................................................46
2.7.6.5 Remote Temperature/Humidity Sensor
(E
2
) ..........................................................................47
2.8 System Charging Procedures ...... 47
2.8.1 Water/Glycol Systems ...................... 47
2.8.1.1 Pump ........................................................ 47
2.8.2 DX Unit Charging Requirements ...... 48
2.8.3 Remote Air-Cooled Systems (AR/AHU)
..................................................................... 48
2.8.4 R407C/R410A Refrigerant .............. 48
2.8.5 Estimating Refrigerant Charge ........ 49
2.8.6 Preparing System for Charging........ 50
2.8.6.1 Evacuate the System ............................51
2.8.7 Refrigerant Charging Procedures .... 52
2.8.7.1 Initial System Charge ............................ 52
2.8.7.2 Fine Tuning the System Charge ..........52
2.8.7.3 0 ºF Fan Cycling and -20 ºF Variable
Speed Control ......................................................53
2.9 Refrigerant Characteristics ......... 54
2.9.1 Pressure/Temperature Settings ...... 54
2.9.2 Saturated Refrigerant Pressure Tables . 56
2.10 System Settings and Adjustments
.............................................................. 57
2.10.1 Low/High Pressure Limit Switch ...57
2.10.1.1 R407C Pressure Switch Settings .....57
2.10.1.2 R410A Pressure Switch Settings .....57
2.10.2 Head Pressure Controls—Air Cooled
Systems ...................................................... 57
2.10.2.1 Condenser Fan Cycling (Condenser
Model SCSAA, 0 °F) ...........................................57
2.10.2.2 Condenser Multi-Speed Fan Switch
(Model HESCAA , 0 °F) ......................................57
2.10.2.3 Variable Condenser Fan Speed
(Condenser Model SCSSA, -20 °F) .................58
2.10.2.4 Intelligent Control (Condenser Model
SCSEC Only, -20 °F) .......................................... 58
2.10.2.5 Flooded Head Pressure Control
(Condenser Model SCSAA With Fan Cycling,
-30 °F) ...................................................................58
2.10.2.6 Flooded Head Pressure Control
(Condenser Model HESCAA, -30 °F) ..............59
2.10.3 Head Pressure Controls (Water- or
Glycol-Cooled Systems) ............................ 59
2.10.3.1 Pressure Valves Rated 150 psig (1.03
MPa) ....................................................................... 59
2.10.3.2 Pressure Valves Rated 350 psig and
450 psig (2.41 and 3.10 MPa) ........................... 59
2.10.4 Humidifier Adjustment ................... 59
2.10.5 Blower Adjustment ......................... 60
2.10.5.1 Belt Drive Blower .................................60
2.10.5.2 EC Fan (Optional) ................................ 61
2.10.6 Thermal Expansion Valve ................ 61
2.10.7 Hot Gas Reheat (Optional) .............. 61
2.10.8 Hot Gas Bypass (Optional) ............. 62
2.10.8.1 Snap Acting Hot Gas Bypass ............. 62
2.10.8.2 Full Floating Hot Gas Bypass ............62
3.0 COMMISSIONING, OPERATION,
AND DECOMMISSIONING ......................64
3.1 Commissioning the Unit ............... 64
3.1.1 Commissioning Steps ....................... 64
3.2 Operating the Unit ........................ 65
3.2.1 Shut-down Procedure ...................... 65
3.2.2 Start-up Procedure ........................... 65
3.3 Programming the Thermostat ...... 66
3.3.1 ATech Controller .............................. 66
3.3.2 E² Controller ...................................... 66
3.4 Decommissioning the Unit ........... 66
3.4.1 Recovering Refrigerant .................... 67
3.4.2 Labeling Decommissioned Equipment
..................................................................... 67
4.0 MAINTENANCE .................................68
4.1 Periodic General Maintenance ..... 68
4.1.1 A/C Unit ............................................. 69
4.1.1.1 Compressor ............................................ 69
4.1.1.2 Heater ...................................................... 69
4.1.1.3 Air Filters ................................................. 69
4.1.1.4 Blower ...................................................... 69
4.1.1.5 Coils ......................................................... 70
4.1.1.6 Drain Pan .................................................70
4.1.1.7 Condensate Pump ................................. 70
4.1.1.8 Humidifier ............................................... 70
4.1.2 Condenser/Condensing Unit ........... 70
4.2 Troubleshooting ............................ 71