McQuay AGS 206A, Operation Manual

Page: 25 / 66

OM AGSB-5 25
Table 13, Unit Controller Setpoints
Description Default Range PW
Unit
Unit Enable OFF OFF, ON O
Unit Mode COOL
COOL, COOL w/Glycol,
ICE w/Glycol, TEST
O
Control source SWITCHES SWITCHES, KEYPAD, NETWORK O
Available Modes COOL
COOL, COOL w/Glycol, COOL/ICE
w/Glycol, ICE w/Glycol, TEST
M
Cool LWT
44. 0
°
F 25.0(40.0) to 60.0
°
F
O
Ice LWT 25.0
°
F 20.0 to 38.0
°
F O
Startup Delta-T 10.0 degF 0.0 to 10.0 degF O
Stop Delta-T 3.0 degF 0.0 to 3.0 degF O
Stage Delta-T 2.0 degF 0.0 to 3.0 degF O
Max Pulldown 0.5 degF/min 0.1-5.0 degF/min M
Evap Recirculate 30 sec 0 to 300 sec M
Evap pump control #1 Only #1 Only, #2 Only, Auto M
LWT Reset Type NONE NONE, RETURN, 4-20mA, OAT M
Max Reset 0.0 degF 0.0 to 20.0 degF M
Start Reset Delta-T 10. 0 degF 0.0 to 20.0 degF M
Soft Load On On, Off M
Begin Capacity Limit 40% 20-100% M
Soft Load Ramp 20 min. 1-60 min. M
Demand Limit no No,yes M
Low Ambient Lock
55
°
F
35-70 degF M
Ice Time Dlay 12 hrs. 1-23 hrs. M
Clear ice Timer No No, Yes M
Display Units
°
F, psi
°
F, psi M
Language English English M
BAS Protocol NONE
NONE, BACnet, LonWorks,
CAREL, MODBUS, N2
M
Ident number 1 0=200 M
Baud Rate 19200 1200, 2400, 4800, 9600, 19200 M
Compressors
Sequence # Cir 1 1 1-3 M
Sequence # Cir 2 1 1-3 M
Sequence # Cir 3 1 1-3 M
Max Compressors On 3 1-3 M
Start-start timer 20 min 15-60 minutes M
Stop-start timer 5 min 3-20 minutes M
Number of Compressors 2 2-3 M
Pumpdown pressure 25.0 psi 10.0-30.0 psi M
Pumpdown time limit 120 sec 0-180 sec M
Light Load Stage Down Point 255 20-50% Slide M
Light Load Stage Down Delay 3 min. 3-30 min. M
Stage Up Delay 5 min. 0-60 min. M
Alarms
Low Evap Pressure-Unload 28 psi 0 to 45 psi M
Low Evap Pressure-Hold 30 psi 0 to 45 psi M
Low Oil Level Delay 120 sec 10-180 sec M
High Oil Press Diff Delay 15 sec 0-60 sec M
Min Lift Delay 30 sec 10-120 sec M
Low Subcooling 5 degF 0 to 10 degF M
High Discharge Temperature
200
°
F
150 to 200 F M
Evaporator Water Freeze 36
°
F 15(34) to 42
°
F M
Evap Flow Proof 3 sec 3 to 120 sec M
High Lift Delay 5 sec. 0-30 sec. M
Sensors
OAT sensor offset 0 degF -5.0 to 5.0 degF M
LWT sensor offset 0 degF -5.0 to 5.0 degF M
EWT sensor offset 0 degF -5.0 to 5.0 degF M
These parameters are remembered during power off, and are factory set to the Default value.