American Power Conversion DX Manuel D’Utilisation
35
NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting
The following graphic is an example of a two-Module System (with four compressors). The setpoint is
21.1°C (70°F) and the deadband is 2.2°C (4°F). Each compressor engages as the return air temperature
reaches its assigned segment of the deadband above the setpoint. When the return air temperature drops
back below the temperature assigned to a compressor, that compressor disengages.
21.1°C (70°F) and the deadband is 2.2°C (4°F). Each compressor engages as the return air temperature
reaches its assigned segment of the deadband above the setpoint. When the return air temperature drops
back below the temperature assigned to a compressor, that compressor disengages.
Caution: If the deadband setting is too narrow, it will cause the System to engage the
compressors in response to a small temperature change. Since the compressors must run for a
minimum period to avoid damage, this could over-cool the room.
compressors in response to a small temperature change. Since the compressors must run for a
minimum period to avoid damage, this could over-cool the room.
Caution: If the deadband setting is too wide, the System will not engage all of its cooling
capacity until the return air temperature is significantly above the setpoint.
capacity until the return air temperature is significantly above the setpoint.
21
°
°
(70 )
Return air temperature
21.6
°
°
(71 )
22.2
°)
°
(72
22.7
°)
°
(73
23.3
°)
°
(74
Compressor
# 1
Compressor
# 2
Compressor
# 3
Compressor
# 4
Cool Deadband Compressor Allocation
Two-Module System
n
a
04
37
a