Heatcraft Refrigeration Products 25000102 User Manual
Installation and Operation
Manual
Bulletin No. H-IM-PCS October 2004 Part Number 25000102
(Replaces H-IM-72B, October 2004)
Parallel
Compressor
Systems
Installation and Operations Manual
Table of Contents
Introduction .............................................................................................................. 3
Inspection
Unit Designation
Model Denition
System Warranty ....................................................................................................... 4
Rigging
Location of Equipment - INDOOR
Clearances
Floor & Foundation Requirements
Vibration Mounts
Figure 1. Vibration Pad & Spring Isolator
Figure 2. Vibration Pad Locations
Location of Equipment - OUTDOOR ........................................................................ 5
Ground Mounting
Roof Mounting
Unit Vibration Isolation
Compressor Spring Vibration Isolators
Figure 3. Spring Mount
Unit Access ................................................................................................................6
Vertical Clearance
Lateral Clearance
Decorative Fences
Units in Pits
Multiple Units
Ventilation Requirements ........................................................................................7
Electrical
Refrigerant Piping
Suction P-Traps
Figure 4. P-Trap requirements
Figure 5. P-Trap construction
Figure 6. Double Suction Risers ............................................................................... 8
Figure 7. Inverted Trap
Refrigerant Line Insulation
Refrigerant Line Support
Figure 8. Pipe Support
Expansion Loops ....................................................................................................... 9
Figure 9. Osets
Table 1. Expansion Chart
Table 2. Pressure Loss of Liquid Refrigerants ....................................................... 10
Table 3. Equivalent Feet of Pipe
Table 4. Weight of Refrigerants in Copper Lines During Operation ................... 11
Table 5A. Recommended Line Sizes for R-404A and R-507 ................................ 12
Table 5B. Recommended Line Sizes for
R-404A and R-507 (continued) ..............................................................13
Table 6A. Recommended Line Sizes for R-22 ........................................................ 14
Table 6B. Recommended Line Sizes for R-22 (continued) ................................... 15
Table 7. Recommended Remote Condenser Line Sizes ....................................... 16
Leak Checking, Evacuation, and Start-up ............................................................. 17
Refrigerant Distribution ........................................................................................ 18
O-Cycle
Electric Defrost
Priority I Hot Gas Defrost
Head Pressure Control System
Electronic Control System ...................................................................................... 19
System Balancing
System Superheat (NOTE: Superheat is not preset at factory)
Evaporator Superheat
Alternative Superheat Method
Compressors ...........................................................................................................20
Copeland Compressors
Table 8. 3D/4D/6D Solid State Modules
Table 9. Typical Voltage Ranges
Table 10. Unloader Factors
Table 11. Oil Safety Switch ..................................................................................... 21
Table 12. Oil Charges
Approved Copeland Lubricants
Carlyle Compressors
Approved Carlyle Lubricants
Oil Pressure
Table 13. O6D/E Oil Pressure History
2 Part # 25000102
© 2007 Heatcraft Refrigeration Products LLC
Table 14. Oil Safety Switch ..................................................................................... 22
Table 15. Part Load Performance Multipliers
Table 16. Required Dierential Pressure
Three-Phase Voltage Monitor
Sight Glass & Moisture Indicator ........................................................................... 23
Figure 10. Sight Glass
Safety Relief Devices
Figure 11. Direct Type Relief Valves
Figure 12. 3-Way Relief Valve
Table 17. Henry Relief Valve Capacity Ratings .....................................................24
Table 18. Discharge Piping Table
Series P100 Pressure Control ................................................................................. 25
Figure 13. P100 Pressure Controls
Auto Reset Models
Manual Reset Models
Liquid Level Switch
S-9400 Level Switch Series
Table 19. Level Switch Table
Figure 14. S-9400
S-9400 Operation
Module Replacement .............................................................................................26
Figure 15. Module Replacement
Oil Control
Low Pressure Oil System
Figure 16. Low Pressure Oil System
Oil Separators
Table 20. AC&R Models...........................................................................................27
Temprite Models
Temprite Valve Adjustment
Table 21. Temprite Models
Figure 17. Temprite Oil System
Oil Level Regulators
Table 22. AC&R Model Regulators .........................................................................28
Troubleshooting Oil System
Liquid Filter-Driers & Suction Filters
Table 23. Sporlan Valve Company
Table 24. Alco Controls
Suction Filter ........................................................................................................... 29
Compressor Motor Burnout Clean-up Procedure
Sporlan Valve Company
Superior Valve Company ........................................................................................ 30
Table 25. Type F Filter
Table 26. Type DF (for clean-up)
Alco Controls
Table 27. Type AF Filter
Table 28. Type AFD (for clean-up)
Head Pressure Control
Valve Functions
Liquid Drain Control Method ................................................................................. 31
Recommended Valve Settings
Table 29. Pressure Range, Set Point & Change per Turn
Field Adjustment
Hot Gas Bypass Regulator Adjustment
Sporlan Valve Company
Valve Setting and Adjustment
Alco Controls ...........................................................................................................32
Valve Setting and Adjustment
Control Settings
Table 30. Control settings for R-404A/R-507
Table 31. Control settings for R-22
Low Pressure Switch Setting for RMCC
General Maintenance Schedule.............................................................................33
SERVICE DIAGNOSIS CHART .............................................................................34-35
Service Record ........................................................................................................ 36
System Reference Data
Parallel Compressor Systems
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 identied 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 Denition:
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 Compressors
3 - 3 Compressors
4 - 4 Compressors
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/O-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 - R-22
4 - R-134A
6 - R-404A, R-507
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
®
Parallel Compressor Systems Installation & Operations Manual, October 2004 3
Installation and Operations Manual
System Warranty
This equipment is designed to operate properly and produce
the rated capacity when installed in accordance with good
refrigeration practice.
The following conditions should be adhered to when installing
this unit to maintain the manufacturers warranty:
(a) System piping must be in accordance with good
refrigeration practices
(b) Inert gas must be charged into the piping during
brazing
(c) The power supply to the unit must meet the following
conditions:
• All voltages must be +/- 10% of the n a m e p l a t e
ratings
• Phase (voltage) imbalance cannot exceed 2%
(d) All control and safety switch circuits must be properly
connected according to the wiring diagram
(e) The factory installed wiring must not be changed without
written factory approval
Rigging
Warning: Careful considerations for lifting should be made
before the unit is lifted by any means. The only part of the unit
designed to carry any of the lifting load is the welded channel
base. The unit may be lifted at the base with a forklift or by
Figure 1. Vibration Pad and Spring Isolator
means of cables at the four corners of the base. If cables are
used, the lifting cables should be prevented from contacting
any of the unit piping or electrical components.
Location Of Equipment - Indoor
Clearances
The parallel systems should be located so they are level and
easily serviced. The minimum suggested clearance around
the units should be 24 inches at the rear and 42 inches in the
front of panel (or as required by National or Local Codes). For
parallel system units placed end to end, 24 inches between
units is suggested.
Floor & Foundation Requirements
The total weight of a single unit will vary between 1200 pounds
and 10,000 pounds. Allowances must be made for the parallel
rack and all other equipment installed in the same area as the
parallel units. The location and installation of all equipment
should be in accordance with all local and national code
requirements.
While each unit is constructed with a welded steel base frame
adequately designed to withstand vibration, the natural
pulsating action of the interconnected motor-compressors
may cause considerable noise and vibration if the unit is not
mounted on a rm level surface and isolated from the structure
of the building.
Vibration Mounts
In ordinary ground level or basement installations, all that is
necessary to assure a vibration-free installation is to place the
unit on the concrete oor with the wae-surfaced resilient pads
supplied. See Figure 2 for suggested pad locations. Mezzanine
and other installations require some special considerations.
The equivalent of 6 inch thick properly reinforced concrete
floor must be provided for mounting parallel units above
grade. It is recommended that the suggestions previously
given for rigid oor construction on above-grade installations
be closely adhered to. If this is not possible, special vibration
NOTE: Turn each leveling nut until the tip casting
rises 1/4” to 3/8” above the bottom
casting. MOUNT ADJUSTMENT SHOULD
NEVER EXCEED 3/4”.
Figure 2. Vibration Pad Locations
4 Part # 25000102
Parallel Compressor Systems
absorbing spring mounts (optional equipment) must be placed
under the base frame of each unit. See Figure 1 for view of
Spring Isolator. The spring mounts are placed under the unit
and the unit carefully lowered on to the mounts. Note that no
other mounting hardware is required and any unevenness in
the oor or uneven weight distribution may be compensated
for by turning the spring mount leveling nuts with an openend wrench. This adjustment should be made after all piping
is installed and the system is charged with refrigerant.
Location of Equipment - Outdoor
The mounting platform or base should be level and located
•
so as to permit free access of supply air.
Units must not be located in the vicinity of steam, hot air
•
or fume exhausts.
The unit should be mounted away from noise sensitive
•
spaces such as oces.
The unit must have adequate support to avoid vibration and
•
noise transmission into the building. Sound and structural
consultants should be retained for recommendations.
Ground Mounting
The unit must be set on a at and level foundation. A single
piece concrete slab with footings extending below the frost
line and raised approximately six inches above ground level
provides a suitable base. Raising the base above ground level
provides some protection from ground water and wind blown
matter. The concrete slab should be isolated from the building
structure. Finally, before tightening mounting bolts, recheck
the level of the unit.
Compressor Spring Vibration Isolators
On units with this option, the compressors are secured rigidly
to make sure there is no transit damage. Before operating the
unit, it is necessary to follow these steps:
1. Remove the upper nuts and washers
2. Discard the shipping spacers
3. Install the neoprene spacers (Spacers located in the electrical
panel or tied to compressor)
4. Replace the upper mounting nuts and washers
5. Allow 1/16 inch space between the mounting nut/washer
and the neoprene spacer
Figure 3. Spring Mount
Roof Mounting
Rooftop installations require adequate structural beams to
support the weight of the unit and service personnel. The
design of the beams/supports must minimize deection and
attendant vibration transmission.
Due to the weights involved, a structural analysis by a qualied
engineer may be required before mounting. Also, for sound
sensitive applications, unit vibration isolators should be used.
Unit Vibration Isolation
Under certain critical conditions, it is recommended that
vibration isolators, of a suitable type, be installed under the
base. The isolators must be designed for the operating weight
of the unit. Rubber-in-shear or spring type isolators (by others)
are available for this purpose.
Parallel Compressor Systems Installation & Operations Manual, October 2004 5
Installation and Operations Manual
Unit Access
Always provide sucient clearance for unit maintenance and
service. Minimum clearances for most situations are described
below (except 60 Inches of free space is required in front of the
control panel). Please note that these are minimums and more
clearance may be required by local codes.
Vertical Clearance
Overhead obstructions are not permitted. Vertical air discharge
from the condenser must have no obstructions that can cause
the discharge air to be recirculated back to the inlet side of
the unit.
Lateral Clearance (Walls or Obstructions)
The unit should be located so that air may circulate freely and
not be recirculated. For proper air ow and access, all sides of
the unit (except control panel end ) should be a minimum of
four feet (1.2 m) away from any wall or obstruction. It is preferred
that this distance be increased whenever possible. Care should
be taken to see that ample room is left for maintenance work
through access doors and panels. When the unit is in an area
where it is enclosed by three walls the unit must be installed
under the guidelines for unit installations in pits.
Decorative Fences
Fences may be installed closer than the four foot (1.2 m) lateral
minimum (except on the control panel end) requirement
whenever fences permit sucient free area to allow adequate
air ow to the unit. Once again, care should be taken to leave
ample room for unit service. Recommended service clearances
are listed above.
Units in Pits
The top of the unit should be level with the top of the pit. If the
top of the unit is not level with the top of the pit, a wider pit or
discharge stacks must be used to raise discharge air to the top
of the pit. This is a minimum requirement.
Multiple Units (Unit-to-Unit Clearance)
For units placed side by side, the minimum distance between
units is eight feet (2.4 m) to prevent air recirculation.
6 Part # 25000102
Parallel Compressor Systems
Ventilation Requirements
Indoor Units
If compressors or condensing units are located in a machine
room, adequate ventilation air must be provided to avoid
an excessive temperature rise in the room. To allow for peak
summer temperatures a 10°F temperature rise is recommended,
although a 15°F rise might be acceptable.
With compressors with remote condensers, approximately 10%
of the heat rejected is given o by the compressor casting and
the discharge tubing. The correct formula for calculating the
ventilation requirement of the Indoor Parallel unit is:
CFM = 10% of THR / hr
10° TD
The air intake should be positioned so that air passes over the
units. All State, Local, and National codes should be followed.
Electrical
To insure the proper operation of equipment and reduce the
possibility of interruption of refrigeration due to electrical
power failure, the following precautions must be observed:
• All electrical work must be done in accordance with the
National Electrical Code and existing local codes
• The power supply must be the same as specied on the unit
data plate
• An adequate power supply must be provided
• Voltage uctuations in excess of 10 percent must
be corrected
• Overload relays (Carrier compressors only) are selected
in accordance with specied limits as determined by the
motor-compressor manufacturer. They must not be changed
in size or shorted-out
• Control panels must be provided with a single phase, 60
Hertz supply. See the unit wiring diagram for the voltage
requirement
• Before starting up a parallel unit, insure that all fuses and
motor-protective devices are in place and that all wiring is
secure. A complete wiring diagram for troubleshooting the
unit will be found inside the control panel cover
Refrigerant Piping
The system as supplied by Heatcraft, was thoroughly cleaned
and dehydrated at the factory. Foreign matter may enter the
system by way of the eld piping required. Therefore, care must
be used during installation of the piping to prevent introduction
of foreign matter.
Install all refrigeration system components in accordance with
all applicable local and national codes and in conformance
with good practice required for the proper operation of the
system.
Proper size refrigeration lines are essential to good refrigeration
performance. Suction lines are more critical than liquid or
discharge lines. Oversized suction lines may prevent proper oil
return to the compressor. Undersized lines can rob refrigeration
capacity and increase operating cost. Consult the line sizing
charts in this manual for proper pipe sizes.
The following procedures should be followed:
1. Do not leave dehydrated compressors or lter-driers open
to the atmosphere
2. Use only refrigeration grade copper tubing, properly sealed
against contamination
3. Suction lines should slope 1/4” per 10 feet towards the
compressor
4. Discharge lines should slope 1/4” per 20 feet toward the
condenser
Suction P-Traps
• Provide P-Traps at the base of each suction riser of four (4)
feet or more to enhance oil return to the compressor. Use a
P-Trap for each 20 feet section of riser. See Figure 4 below:
Figure 4. P-Trap Requirements
*The P-Trap should be the same size as the horizontal line
See Figure 5 below
Figure 5. P-Trap Construction
Parallel Compressor Systems Installation & Operations Manual, October 2004 7
Installation and Operations Manual
In systems equipped with capacity control compressors,
•
or where multiple compressors are used with one or more
compressors cycled o for capacity control, double suction
risers should be installed. See Figure 6 below. The two
lines should be sized so that the total cross-section area
is equivalent to the cross section area of a single riser that
would have both satisfactory gas velocity and acceptable
pressure drop at maximum load conditions. The two lines
normally are dierent in size, with the larger line trapped as
shown. The smaller line must be sized to provide adequate
velocities and acceptable pressure drop when the entire
minimum load is carried in the smaller riser.
Figure 6. Double Suction Risers
•
When brazing refrigerant lines, an inert gas should
be passed through the line at low pressure to prevent
scaling and oxidation inside the tubing. Dry nitrogen is
preferred.
•
Use long radius ell’s for lower pressure drop.
•
Provide expansion loops in long straight refrigerant
lines that are subject to expansion and contraction. See
Expansion Loops in this manual for more information.
Refrigerant Line Insulation
Insulate suction lines from the evaporators to the parallel
•
unit with minimum 3/4” thick ness closed-cell type
insulation on low temperature circuits. Insulate suction
lines on medium temperature circuits with minimum 1/2”
thick insulation to prevent condensation.
Long liquid lines run in areas exposed to high temperatures
•
should be fully insulated with minimum 1/2” insulation.
Suction and liquid lines should never be taped or
•
soldered together.
Refrigerant Line Support
Strap and suppor t tubing to prevent excessive line
•
vibration and noise. All tubing clamps should have an
insulating material (i.e. Hydra Sorb bushing) to prevent
metal to metal contact.
In operation, at maximum load conditions gas and
•
entrained oil will be flowing through both risers. At
minimum load conditions, the gas velocity will not be
high enough to carry oil up both risers. The entrained oil
will drop out of the refrigerant gas ow and accumulate
in the “P” trap forming a liquid seal. This will force all of the
ow up the smaller riser, there by raising the velocity and
assuring oil circulation through the system.
When connecting more than one suction line to a main
•
trunk line, connect each branch line with an inverted trap.
See Figure 7 below:
Figure 7. Inverted Trap
Figure 8. Pipe Support
Straight runs should be supported near each end.
•
Long runs require additional supports.
•
A general guide is:
•
3/8” to 7/8” every 5 feet
•
1-1/8” to 1-3/8” every 7 feet
•
1-5/8” to 2-1/8” every 10 feet
•
When changing directions, supports should be placed a
•
maximum of 2 feet in each direction.
Piping attached to a vibrating object (such as a compressor
•
or compressor base) must be supported in such a manner
that will not restrict the movement of the vibrating object.
Rigid mounting will fatigue the copper tubing.
Use only a suitable silver solder alloy on suction and liquid
•
lines.
Limit the soldering paste or ux to the minimum required
•
to prevent contamination of the solder joint internally. Flux
only the male portion of the connection, never the female.
After brazing, remove excess ux.
8 Part # 25000102
Parallel Compressor Systems
Expansion Loops
Suction, liquid and remote condenser lines are subject to
expansion and contraction and proper piping techniques
must be employed (especially on hot gas lines) to prevent line
breakage. This is critical on long straight runs of generally 70’ or
more where expansion loops must be provided and hangers
should allow for longitudinal movement of the piping.
On a refrigeration system with gas defrost, the refrigerant lines
expand and contract with temperature changes. The suction
line normally has the greatest movement since it has the
largest temperature change during defrost. If the expansion
and contraction is not planned for during the installation of
refrigeration lines, kinking and breaking of the lines could
occur.
Figure 9. Osets
In order to compensate for the expansion of the tubing, it
is necessary to estimate the amount of expansion and then
provide osets or loops in the refrigerant piping. Normally the
area to be most concerned with is the straight line distance
from the xture to the parallel compressor unit.
A simple form of expansion loop can be made of soft tempered
copper tube by bending it to the correct size and shape. A
neater type is made by assembling hard tube with solder elbows
as in Figure 9. The correct proportions of such expansion loops
to meet various conditions are shown in Table 1.
In compensating for expansion and contraction, two items
are very important:
Liquid and suction lines can not be joined together and
•
should not touch at any point
Pipe hangers must be located and installed in such a
•
manner as not to restrict the expansion and contraction
of the tubing. All tubing clamps should have an insulating
material (i.e. Hydra Sorb bushing) to prevent metal to metal
contact
Table 1. Expansion Chart
Table of Values for “L”
Ref. Line
OD (in.)
7/8 10 15 19 22 25 27 30 34 38
1-1/8 11 16 20 24 27 29 33 38 42
1-3/8 11 17 21 26 29 32 36 42 47
1-5/8 12 18 23 28 31 35 39 46 51
2-1/8 14 20 25 31 34 38 44 51 57
2-5/8 16 22 27 32 37 42 47 56 62
NOTES: Calculations for expansion and contraction should be based on the average coecient of expansion of copper which is .0000094
per degree Fahrenheit between 77°F and 212°F. Example, the expansion for each 100 feet of length of any size of tube heated from room
temperature of 70°F to 170°F, a rise of 100°F, is:
100°F (rise °F) X 100 (linear feet) X 12 (inches) X.0000094 (coecient) = 1.128 inches
(Reprinted from Copper & Brass Research Association)
Parallel Compressor Systems Installation & Operations Manual, October 2004 9
1/2 1 1-1/2 2 2-1/2 3 4 5 6
Amount of Expansion (in.)
Installation and Operations Manual
Table 2. Pressure Loss of Liquid Refrigerants
(In Liquid Line Risers - Expressed in Pressure Drop, PSIG, and Subcooling Loss, °F)
Liquid Line Rise in Feet
Refrigerant
R-12 5.4 2.8 8.1 4.2 10.7 5.4 13.4 6.9 16.1 8.3 21.5 11.3 26.9 14.3 40.3 22.4 53.7 31.0
R-22 4.8 1.6 7.3 2.3 9.7 3.1 12.1 3.8 14.5 4.7 19.4 6.2 24.2 8.0 36.3 12.1 48.4 16.5
R-502 4.9 1.5 7.3 2.2 9.7 3.0 12.1 3.7 14.6 4.5 19.5 6.0 24.3 7.6 36.4 11.5 48.6 14.8
R-134A 4.9 2.0 7.4 2.9 9.8 4.1 12.3 5.2 14.7 6.3 19.7 8.8 24.6 11.0 36.8 17.0 49.1 23.7
R-404A/R-507 4.1 1.1 6.1 1.6 8.2 2.1 10.2 2.7 12.2 3.3 16.3 4.1 20.4 5.6 30.6 8.3 40.8 11.8
Based on 110°F liquid temperature at bottom of riser
10’ 15’ 20’ 25’ 30’ 40’ 50’ 75’ 100’
PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F
Table 3. Equivalent Feet of Pipe
(Due to Value and Fitting Friction)
Copper Tube
OD, Type “L”
Globe Value (Open) 14 16 22 28 36 42 57 69 83 99 118 138 168
Angle Value (Open) 7 9 12 15 18 21 28 34 42 49 57 70 83
90° Turn Through Tee 3 4 5 6 8 9 12 14 17 20 22 28 34
Tee - Straight Through
or Sweep Below
90° Elbow or Reducing
Tee (Straight Through)
1/2 5/8 7/8 1-1/8 1-3/8 1-5/8 2-1/8 2-5/8 3-1/8 3-5/8 4-1/8 5-1/8 6-1/8
.75 1 1.5 2 2.5 3 3.5 4 5 6 7 9 11
1 2 2 3 4 4 5 7 8 10 12 14 16
10 Part # 25000102
Parallel Compressor Systems
Table 4. Weight of Refrigerants in Copper Lines During Operation
(Pounds per 100 Lineal Feet of Type “L” Tubing)
Line Size
OD (in.)
3/8
1/2
5/8
7/8
1-1/8
1-3/8
1-5/8
2-1/8
2-5/8
3-1/8
3-5/8
4-1/8
Refrigerant
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
12, 134A
22
R-507, 502, 404A
Liquid
Line
4.0
3.9
3.4
7.4
7.4
6.4
11.9
11.8
10.3
24.7
24.4
21.2
42.2
41.6
36.1
64.2
63.5
55.0
90.9
90.0
78.0
158
156
134
244
241
209
348
344
298
471
465
403
612
605
526
Hot Gas
Line
.15
.22
.31
.30
.41
.58
.47
.65
.93
.99
1.35
1.92
1.70
2.30
3.27
2.57
3.50
4.98
3.65
4.96
7.07
6.34
8.61
12.25
9.78
13.70
18.92
13.97
18.95
27.05
18.90
25.60
36.50
24.56
33.40
47.57
Suction Line at Suction Temperature
-40°F -20°F 0°F 20°F 40°F
.01
.02
.03
.01
.03
.04
.02
.05
.07
.05
.10
.15
.08
.17
.26
.14
.27
.40
.20
.37
.56
.34
.65
.98
.52
1.01
1.51
.75
1.44
2.16
.99
1.94
2.92
1.29
2.53
3.80
.01
.03
.04
.03
.05
.07
.05
.08
.11
.10
.16
.23
.17
.28
.39
.26
.42
.58
.37
.59
.82
.64
1.03
1.43
.99
1.59
2.21
1.41
2.28
3.15
1.91
3.08
4.25
2.49
4.01
5.55
.02
.04
.06
.04
.07
.13
.07
.12
.17
.15
.24
.37
.26
.42
.63
.40
.64
.95
.57
.90
1.35
.98
1.57
2.35
1.51
2.42
3.62
2.16
3.45
5.17
2.92
4.67
6.97
3.81
6.08
9.09
.04
.06
.09
.07
.11
.16
.12
.17
.25
.24
.36
.51
.41
.61
.86
.61
.93
1.32
.87
1.33
1.86
1.51
2.30
3.23
2.32
3.54
5.00
3.31
5.05
7.14
4.48
6.83
19.65
5.84
8.90
12.58
.06
.08
.13
.11
.15
.24
.17
.25
.35
.36
.51
.72
.60
.87
1.24
1.91
1.33
1.87
1.30
1.88
2.64
2.24
3.26
4.58
3.47
5.03
7.07
4.96
7.18
9.95
6.69
9.74
13.67
8.75
12.70
17.80
Parallel Compressor Systems Installation & Operations Manual, October 2004 11
Loading...