Installation manual
IM 1029-2 Magnitude™ Frictionless Centrifugal Chillers – Model WMC 9
Physical Data and Weights
With positive pressure systems, the pressure variance with temperature is always predictable, and the vessel
design and pressure relief protection are based upon pure refrigerant characteristics. R-134a requires ASME
vessel design, inspection and testing and uses spring-loaded pressure relief valves. When an over-pressure
condition occurs, spring-loaded relief valves purge only that quantity of refrigerant required to reduce the
pressure to the valve’s set pressure and then close. See Relief Valves section for additional information.
Evaporator
Refrigerant-side design pressure is 200 psi (1380 kPa). Water-side is 150 psi (1034 kPa).
Table 2, Evaporator Physical Data
WMC Model
Evaporator
Code
Tube
Length
Unit Refrigerant
Charge
lb. (kg)
Evaporator
Water
Volume, gal (L)
Number of
Relief
Valves
145S,
E2209
9 ft.
500 (227)
38 (145)
1
145D
E2209
9 ft. 600 (272) 38 (145) 1
150D E2212
12 ft. 800 (363) 45 (170) 1
250D
E2609
9 ft. 600 (272) 61 (231) 1
290D E2612
12 ft. 1100 (500) 72 (273) 1
400D E3012
12 ft. 1240 (562) 88 (336) 1
Notes:
1. Refrigerant charge is for the entire unit and is approximate since the actual charge will depend on other variables. Actual charge will
be shown on the unit nameplate.
2. Water capacity is based on standard tube configuration and standard dished heads.
Condenser
Refrigerant-side design pressure is 200 psi (1380 kPa). Water-side design is 150 psi (1034 kPa).
Table 3, Condenser Physical Data
WMC Model
Condenser
Code
Tube
Length
Maximum
Pumpdown
Capacity lb. (kg)
Water
Volume
gal. (L)
Number of
Relief Valves
145S, 145D
C2009
9 ft.
724 (328)
47 (147)
2
150D
C2012
12 ft. 971 (440) 62 (236) 2
250D
C2209
9 ft.
883 (401)
61 (231)
2
290D
C2212
12 ft.
1174 (533)
72 (273)
2
400D
C2612
12 ft.
1676 (760)
111 (419)
2
Notes:
1. Condenser pumpdown capacity based on 90% full at 90°F.
2. Water capacity based on standard configuration and standard heads and can be less with lower tube counts.