Quantech
154
Form QTC3-NM1
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 congurations
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 dierential o 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 dierential
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
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