3
1.0 Chiller Identification
The module information data plate is located inside the electrical box compartment of each module. When ordering service parts or inquiring for technical
assistance it is important to provide the model and serial number.
1.1 Water Cooled Model Number
ASP15X2H2A0-410a
ASP 15
X
2
H
2
A
O
-410a
ASP = Air Stack Packaged
15 = tons (10,15,20,30,60, -tons)
X or C = X: Copeland 410a Compressor
C : Trane Scroll
2 or 1 = 1: Dual Circuit Evaporator, 1: Single Circuit Evaporator
H = 460V
(Or: A = 208V
L = 230V
C = 575V
V = special)
2 = Multiple Module Power
1 = Direct Connect Power
A = Water Cooled (Or:
D = DX unit, R= Heat Pump, F= Free Cool, C=Condenser, L=Fluid Cooler)
O = ARI Version
410a = Refrigerant
1.2 Serial Number Identification
AJ-06-25
A = Decade built
I = 1990’s
J= 2000’s
A=2010’s
J = Year built
A= ’01, B= ’02, C=’03…J=’10
06 = June (month built)
01 = Jan.
02 = Feb.
25 = 25th module built
01 = 1st
02 = 2nd
2.0 Theory of Operation
The Airstack ASPX chillers provide chilled water to an external load based off of the return water temperature calculated on the module Master Control. When
the Entering Chilled Water sensor sends the signal to the Master Control that Cooling is needed, compressors will begin to start and produce Chilled Water. The
point at which the Entering Chilled Water temperature calls for compressors to start is determined by the Up - Setpoint, Lo-Setpoint and the Variable Setpoint
settings in the System Variables menu of the Master Control.
When the ECHW sensor is signaled that Chilled Water temperature has dropped below the set-point, compressors will begin to cycle off.
3.0 Water Treatment
Proper water treatment is essential to ensure the peak efficiency and performance of the Chiller. The evaporator side water quality should be kept within
the following parameters to prevent any damage to the heat exchangers. The use of hydrochloric, sulfuric, and muriatic acids as well as household bleach
can cause stress corrosion to the stainless steel in the heat exchangers. Use of these or any other unapproved chemicals is not covered under the Multistack
warranty.
Multistack
Water
Guidelines
PH
> 7 - < 9
TDS
< 1000 ppm (if glycol used this parameter will be exceeded)
Hardness
30 - 500 ppm
Alkalinity
30 - 500 ppm (if glycol used this parameter will be exceeded)
Chlorides
< 200 ppm
Sulphates
< 200 ppm
