RT-SVX072A-EN
133
Table 60. Startup checklist for 90–130 ton air-cooled units (continued)
Completed?
4
Verify compressor operation, voltage and amperage matches name plate information (please document on log
sheet)
Yes No
5
Operating log completed
Yes No
6
All panels & doors secured
Yes No
7
Complete all required documentation
Yes No
Critical Control Parameters and Dry Bulb Changeover Map
Table 61. Critical control parameters
Description
Suggested
Parameter
Economizer Settings
Region
1
Region
2
Region
3
Region
4
Region
5
Region
6
Region
7
Supply Air Temperature Control Setpoint
55°F
Supply Air Temperature Deadband
8°F
Supply Air Pressure Setpoint
1.8" w.c.
Supply Air Pressure Deadband
0.1" w.c.
Building Static Pressure Setpoint
0.03" w.c.
Building Static Pressure Deadband
0.04" w.c.
Standby Freeze Avoidance
20%
Relief Enable Setpoint
10%
Economizer Minimum Position Setpoint
10%
Fixed Dry Bulb Economizer C/O Type a
(Moist)*
TOA >
65°F
TOA >
65°F
TOA >
65°F
TOA >
65°F
TOA >
70°F
TOA >
70°F
TOA >
70°F
Fixed Dry Bulb Economizer C/O Type b (Dry)
*
TOA > 75°F
Fixed Dry Bulb Economizer C/O Type c
(Marine)*
TOA >
75°F
TOA >
75°F
TOA >
75°F
Fixed Reference (Enthalpy Changeover)
HOA > 28 Btu
Differential Comparative (Enthalpy
Changeover)
HOA > HRA
Notes:
1. See map in next figure for dry bulb changeover.
Examples:
- Minneapolis, Minnesota is in “Region 6" and resides in “Moist” subregion, thus designation is 6b. Economizer changeover setting should be
75°F.
- Charleston, South Carolina is in “Region 3" and resides in “Moist” subregion, thus the designation is 3c. Economizer changeover setting
should be 65°F.
2. Go to SETUP menu and input setting for parameters listed in the table above.
3. Use the Dry bulb changeover map to determine region of country based on unit site location.
4. Fixed speed compressor units 8°F deadband.
5. eFlex™ compressor units 4°F deadband.
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