Johnson Controls
158
Form 150.72-ICOM6
Issue date: 12/19/2023
Section 7: Unit controls
Table 18:
Program key limits and default
Program value
Mode
Low limit
High limit
Default
Discharge pressure cutout
—
325 psig
575 psig
570 psig
22.41 barg
39.64 barg
39.30 barg
Suction pressure cutout
Water cooling
87.0 psig
120.0 psig
87.0 psig
6.00 barg
8.27 barg
6.00 barg
Glycol cooling
82.0 psig
120.0 psig
87.0 psig
5.65 barg
8.27 barg
6.0 barg
Low ambient temperature cutout
Standard ambient
33.0 psig
120.0 psig
44.0 psig
2.28 barg
8.27 barg
3.03 barg
Low ambient
25.0ºF
60.0ºF
25.0ºF
-3.9ºC
15.6ºC
-3.9ºC
VSD fan
-10.0ºF
60.0ºF
25.0ºF
-23.3ºC
15.6ºC
-3.9ºC
All other configurations
0.0ºF
60.0ºF
25.0ºF
-17.8ºC
15.6ºC
-3.9ºC
Leaving chilled liquid
temperature cutout
Water cooling
—
—
36°F
2.2°C
Glycol cooling
8.0ºF
36.0ºF
36.0ºF
-13.3ºC
2.2ºC
2.2ºC
Low temperature
glycol cooling
-1.0ºF
36.0ºF
36.0ºF
-18.3ºC
2.2ºC
2.2ºC
Anti-recycle timer
—
300 s
600 s
600 s
Fan control on pressure
—
360 psig
485 psig
385 psig
24.8 barg
33.4 barg
26.5 barg
Fan differential off pressure
—
80 psid
160 psid*
125 psid
5.51 bard
11.03 bard*
8.62 bard
Total number of compressors
Single system
2
3
3 comps
Dual system
4
6
6 comps
Number of fans per system
—
2
6
3 fans
Unit/system trip volts
Current feedback
0.5 V
4.5 V
2.5 V
Remote unit ID
—
0
7
0
Duty/standby pump change over
—
1
30
30
Three-way valve RLH temperature
setpoint
—
55.0°F
65.0°F
60.0°F
—
12.8°C
18.3°C
15.6°C
Three-way valve pressure differential
setpoint
—
100 psig
140 psig
100 psig
—
6.89 barg
9.65 barg
6.89 barg
Three-way valve voltage setpoint
—
4.0 V
7.0 V
5.0 V
Three-way valve on time
—
180 s
600 s
300 s
Anti-vacuum suction pressure cutout
—
3 psig
20 psig
10%
programmed
suction cutout
—
0.21 barg
1.38 barg
Anti-vacuum delay time
—
3 s
30 s
6 s
VSD fan low pressure limit
—
247 psig
345 psig
247 psig
—
17.03 barg
23.78 barg
17.03 barg
VSD fan high pressure limit
—
350 psig
450 psig
450 psig
24.13 barg
31.03 barg
31.03 barg