Table of Contents
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Section 1 • General Information
Refrigeration Compressor Unit Model Designations
The compressor unit model designation can be found on the nameplate. For nameplate location, see Component
Identification section on page 1-4.
Compressor Model
VSM/VSMC = Vilter
TM
Single Mini-Screw
VSS/VSSC= Vilter
Single
TM
Screw
VRS= Vilter
Twin Screw
TM
VSH /VSSH= Vilter
TM
Single Screw Heat Pump
Refrigerant Service
A = R-717 (Ammonia)
B = R-407A
C = R-744 (CO2)
E = R-134a
F=R-407F
H = R-404A
J = R-410A
K=R-407C
M = R-22
P = R-290 (Propane)
R = R-1270 (Propylene)
Z = R-507
*
Suction Connection
3, 4, 6, 8 = 3", 4", 6", 8"
A = 10"
B = 12"
C = 14"
1 – 2
Compressor Size
CFM- Nominal CFM
displacement of the
compressor at 3600
rpm
VSM - 301 - A - HP - E - 16H - N - PL - R - S - 3 - XCHR
Driver
V =Variable
N= No Economizer,
Frequency Drive
Economizer Ports
E =Electric Motor
Drive
Connection, Ports Piped
G =Engine Drive
F= Economizer Flanges,
Flanged Port Covers
(piping by others)
**
Blank
No special
features
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Application
HP=High Stage,
with Oil Pump
HN=High Stage,
No Oil Pump (SOI
= Suction Oil
Injection)
*H=Horizontal
V=Vertical
B = Booster
SH=Special Horizontal
S = Swing
SV=Special Vertical
Economizer
Plugged
Liquid Injection Cooling & Port:
E= Economizer
to Single Flange
Custom Features
X[letter(s)] = Special Feature(s):
C=Cartridge-Style Reliefs
E=Special Electrical Codes
F=Fixed Slide
H=Hazardous Area Req.
Separator Type
16= 16-inch diameter
20= 20-inch diameter
24= 24-inch diameter
30= 30-inch diameter
36= 36-inch diameter
42= 42-inch diameter
48= 48-inch diameter
54= 54-inch diameter
60= 60-inch diameter
**
*
Oil Cooler
PL=Plate
ST=Shell and Tube
LH = High Port
LM = Medium Port
LL = Low Port
L2 = High and Medium Ports
L1 = Medium and Low Ports
VP= V-Plus Pumped Liquid
R= Remote
L=Dual coolers (LI or PL)
R=CRN Units
S=Special Separator Features
V=Specific Vendor
Oil Cooling
Medium
R = Refrigerant
W =Water
G =Glycol
A=Air
Oil Filter
S=Single Filter
D=Dual Filter
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Table of Contents
Troubleshooting
