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HEATCRAFT INC.
Parallel Compressor Units
INTRODUCTION
Parallel Compressor systems are central refrigeration units
employing 2 to 8 parallel piped compressors, a control
panel, and receiver mounted on one common base frame.
The system may be designed for either Indoor or Outdoor
use. The Outdoor design may include the condenser
mounted and piped.
The selection and design of the system is based on the
needs of the individual customer. The most important point
in planning an installation of the Heatcraft parallel system is
the proper selection of the system components for the
particular application.
Component parts have been selected for their dependability
and availability to keep service problems to a minimum.
Simplicity of design has also made the Heatcraft parallel
system one of the easiest to service and install. The
simplicity and compactness of the Heatcraft design make
the addition of hot gas defrost and/or heat reclaim a simple
and economical feature.
In the following pages will be found explanations of system
components, wiring and piping diagrams, control settings,
and operational guides.
INSPECTION
Unit inspection should be assigned to a dependable
individual. Inspect the parallel system and any accessories
shipped with them for damages or shortages before and
during unloading. All items on bill of lading should be
accounted for prior to signing the shipping receipt. Note any
shortages or damage on carrier’s delivery receipt (Specify
the extent and type of damage found). Unit should be
inspected carefully for concealed damage. Notify the
Heatcraft sales representative and the carrier of the damage
immediately. Request an immediate joint inspection with the
carrier (Do not repair the unit until inspected by carrier’s
representative). Care should be exercised when uncrating
units to prevent damage.
The system is shipped with a holding charge of dry nitrogen.
Check to see that pressure is still in the unit upon receipt.
Report lack of pressure immediately to the Heatcraft service
department.
NOTE: Accessory items such as drier cores,
mounting pads, modems, etc. may be packaged
in a separate carton. Be sure that you receive
all items.
UNIT DESIGNATION
Units are identified by letter, brand, compressor type,
quantity of compressors, horsepower, condenser type,
control voltage, defrost type, refrigerant / range, unit voltage
and application. Unless otherwise requested by the
customer all refrigeration circuits are numbered from one to
the highest and from left to right while facing the electrical
panel.
Model definition:
1st digit - Brand (B, C, H, or L)
2nd digit - Compressor Type
H - Hermetic
R - Reciprocating
S - Screw
O - Open
Z - Scroll
C - Compound
3rd digit - Unit Construction
R - Remote Condenser
U - Attached Condenser
H - Hybrid
M - Multi-compressor Platform
F - Frame Hybrid (Frame + Standard Unit)
4th digit - Compressor Quantity
2 - 2 compressor
3 - 3 compressor
4 - 4 compressor
Etc.
5th, 6th, & 7th digit - Horsepower
030 - 30 HP
075 - 75 HP
100 - 100 HP
Etc.
8th digit - Condenser Type
A - Air
W - Water
E - Evaporative
9th digit - Control Voltage
A - 115/1/60
B - 208-230/1/60
C - 24/1/60
10th digit - Defrost Type
A - Air / Off Cycle
E - Electric
G - Hot Gas
M - Multiple
W - Water
11th digit - Temperature Range
L - Low
M - Medium
H - High
C - Combination
X - Ultra Low
12th digit - Refrigerant Type
2 - R22
4 - R134a
6 - R404a, R507
8 - Multiple
13th digit - Unit Voltage
C - 208 - 230/3/60
D - 460/3/60
E - 575/3/60
J - 208/3/60
K - 230/3/60
M - 380/3/60
14th digit - Application
1 - Indoor
2 - Outdoor