Heatcraft Refrigeration Products H-IM-72A User Manual

ParallelParallel

Parallel

ParallelParallel

CompressorCompressor

Compressor

CompressorCompressor

SystemsSystems

Systems

SystemsSystems

InstallationInstallation

Installation

InstallationInstallation

H-IM-72B October 1999 Part No. 25000102

Replaces H-IM-72A

Installation, Operation and

Maintenance Guide

Parallel Compressor Systems

HEATCRAFT INC. REFRIGERATION PRODUCTS DIVISION

2175 WEST PARK PLACE BLVD., STONE MOUNTAIN, GA 30087 • 770-465-5600 • FAX [phone]

WWW.HEATCRAFTRPD.COM • E-MAIL: [e-mail]

1

Table of Contents

Introduction
Inspection
Unit Designation

Model Definition................................................................................ 3

System Warranty
Rigging
Location of Equipment - INDOOR
Clearances
Floor & Foundation Requirements
Vibration Mounts
Figure 1. Vibration Pad & Spring Isolator

Figure 2. Vibration Pad Locations ..................................................... 4

Location of Equipment - OUTDOOR
Ground Mounting
Roof Mounting
Unit Vibration Isolation
Compressor Spring Vibration Isolators

Figure 3. Spring Mount ..................................................................... 5

Unit Access
Vertical Clearance
Lateral Clearance
Decorative Fences
Units in Pits

Multiple Units .................................................................................... 6

Ventilation Requirements
Electrical
Refrigerant Piping
Suction P-traps
Figure 4. P-trap requirements

Figure 5. P-trap construction............................................................. 7

Figure 6. Double Suction Risers
Figure 7. Inverted Trap
Refrigerant Line Insulation
Refrigerant Line Support

Figure 8. Pipe Support ...................................................................... 8

Expansion Loops
Figure 9. Offsets

Table 1. Expansion Char t ................................................................. 9

Table 2. Pressure Loss of Liquid Refrigerants

Table 3. Equivalent Feet of Pipe ..................................................... 10

Table 4. Weight of Refrigerants in Copper Lines During Operation . 11

Table 5A. Recommended Line Sizes for R-404A and R507 ........... 12

Table 5B. Recommended Line Sizes for

R-404A and R507 (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
Off cycle
Electric defrost
Priority I hot gas defrost

Head pressure control system ........................................................ 18

Electronic control system
System Balancing
System Superheat (NOTE: Superheat is not preset at factory)
Evaporator Superheat

Alternative Superheat Method ........................................................ 19

Compressors
Copeland Compressors
Table 8. 3D/4D/6D Solid State Modules
Table 9. Typical Voltage Ranges

Table 10. Unloader Factors............................................................. 20

Table 11. Oil Safety Switch
Table 12. Oil Charges
Approved Copeland Lubricants
Carlyle Compressors
Approved Carlyle Lubricants
Oil Pressure

Table 13. O6D/E Oil Pressure History ............................................. 21

2

Table 14. Oil Safety Switch
Table 15. Part Load Performance Mult.
Table 16. Required Differential Pressure

Three-Phase Voltage Monitor ......................................................... 22

Sight Glass & Moisture Indicator
Figure 10. Sight Glass
Safety Relief Devices
Figure 11. Direct Type Relief Valves

Figure 12. 3-way Relief Valve ......................................................... 23

Table 17. Henry Relief Valve Capacity Ratings

Table 18. Discharge Piping Table.................................................... 24

Series P100 Pressure Control
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 ........................................................................... 25

Module Replacement
Figure 15. Module Replacement
Oil Control
Low Pressure Oil System
Figure 16. Low Pressure Oil System

Oil Separators................................................................................. 26

Table 20. AC & R Models
Temprite Models
Temprite Valv e Adjustment
Table 21. Temprite Models
Figure 17. Temprite Oil System

Oil Level Regulators .......................................................................27

Table 22. A C & R Model Regulators
Troubleshooting Oil System
Liquid Filter-Driers & Suction Filters
Table 23. Sporlan Valve Co.

Table 24. Alco Controls ................................................................... 28

Suction Filter
Compressor Motor Burnout Clean-up Procedure

Sporlan Valve Company ................................................................. 29

Superior Valve Company
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 .............................................................................. 30

Liquid Drain Control Method
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 ......................................................... 31

Alco Controls
Valve Setting and Adjustment
Control Settings
Table 30. Control settings for R404A (507)
Table 31. Control settings for R22

Low Pressure Switch Setting for RMCC.......................................... 32

General Maintenance Schedule...................................................... 33

SERVICE DIAGNOSIS CHART ................................................. 34-35

Service Record

System Reference Data..................................................................36

© Heatcraft 1999

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: Accessor y 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

3

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
nameplate 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:

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 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.

Careful considerations for lifting should be made

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.

Figure 1. Vibration Pad and Spring Isolator

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 motor­compressors may cause considerable noise and vibration if
the unit is not mounted on a firm 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 floor with the waffle-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 floor construction
on above-grade installations be closely adhered to. If this is
not possible, special vibration 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
floor or uneven weight distribution may be compensated for
by turning the spring mount leveling nuts with an open-end
wrench. This adjustment should be made after all piping is
installed and the system is charged with refrigerant.

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

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 offices.

• 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 flat 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.

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 deflection and
attendant vibration transmission.

Due to the weights involved, a structural analysis by a
qualified engineer may be required before mounting. Also,
for sound sensitive applications, unit vibration isolators
should be used.

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

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.

5

UNIT ACCESS

Always provide sufficient 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 flow 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 sufficient free area to
allow adequate air flow 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

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 off by the compressor
casting and the discharge tubing. The correct formula for
calculating the ventilation requirement of the Indoor Parallel
unit is:

CFM =

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
specified on the unit data plate.

• An adequate power supply must be provided.

• Voltage fluctuations in excess of 10 percent
must be corrected.

• Overload relays (Carrier compressors only)
are selected in accordance with specified
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.

10% of THR/hr

10° TD

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
filter-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.

REFRIGERANT PIPING

The system as supplied by Heatcraft, was thoroughly cleaned
and dehydrated at the factor y. Foreign matter may enter the
system by way of the field 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.

Figure 5. P-Trap Construction

7

• In systems equipped with capacity control
compressors, or where multiple compressors
are used with one or more compressors
cycled off 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
different 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

• 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 flow and accumulate in the
"P" trap forming a liquid seal. This will force
all of the flow up the smaller riser, thereby
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

8

• 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" thickness
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 support 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.

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 flux 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 flux.

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. Offsets

In order to compensate for the expansion of the tubing, it is
necessary to estimate the amount of expansion and then
provide offsets or loops in the refrigerant piping. Normally the
area to be most concerned with is the straight line distance
from the fixture 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 Amount of Expansion (Inches)

1

O.D. "

7

/8 10 15 19 22 25 27 30 34 38

/2 11

1

/2 22

1

/2 3456

11/8 11 16 20 24 27 29 33 38 42
13/8 11 17 21 26 29 32 36 42 47
15/8 12 18 23 28 31 35 39 46 51
21/8 14 20 25 31 34 38 44 51 57
25/8 16 22 27 32 37 42 47 56 62

NOTE: Calculations for expansion and contraction should be based on the average coefficient 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 (coefficient) = 1.128 inches

(Reprinted from Copper & Brass Research Association)

9

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

10’ 15’ 20’ 25’ 30’ 40’ 50’ 75’ 100’

Refrigerant PSIG

°F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG °F

R12 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
R22 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

R502 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

R134A 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

R507, R404A 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.

Table 3. Equivalent Feet of Pipe

(Due to Valve and Fitting Friction)

Copper Tube,

O.D., Type "L"

1

5

/2

7

/8

/8 11/8 13/8 15/8 21/8 25/8 31/8 35/8 41/8 51/8 61/8

Globe Valv e (Open) 14 16 22 28 36 42 57 69 83 99 118 138 168
Angle Valv e (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 .75 1 1.5 2 2.5 3 3.5 4 5 6 7 9 11

90° Elbow or Reducing

Tee (Straight Through) 1 2 2 3 4 4 5 7 8 10 12 14 16

10

Table 4. Weight of Refrigerants in Copper Lines During Operation

(Pounds per 100 Lineal feet of type "L" tubing.)

Line Size Suction Line at Suction Temperature

O.D. Liquid Hot Gas

in Inches Refrigerant Line Line -40

12, 134a 4.0 .15 .01 .01 .02 .04 .06

3/8 22 3.9 .22 .02 .03 .04 .06 .08

R507, 502, 404A 3.4 .31 .03 .04 .06 .09 .13

12, 134a 7.4 .30 .01 .03 .04 .07 .11

1/2 22 7.4 .41 .03 .05 .07 .11 .15

R507, 502, 404A 6.4 .58 .04 .07 .13 .16 .24

12, 134a 11.9 .47 .02 .05 .07 .12 .17

5/8 22 11.8 .65 .05 .08 .12 .17 .25

R507, 502, 404A 10.3 .93 .07 .11 .17 .25 .35

12, 134a 24.7 .99 .05 .10 .15 .24 .36

7/8 22 24.4 1.35 .10 .16 .24 .36 .51

R507, 502, 404A 21.2 1.92 .15 .23 .37 .51 .72

12, 134a 42.2 1.70 .08 .17 .26 .41 .60

1 1/8 22 41.6 2.30 .17 .28 .42 .61 .87

R507, 502, 404A 36.1 3.27 .26 .39 .63 .86 1.24

12, 134a 64.2 2.57 .14 .26 .40 .61 1.91

1 3/8 22 63.5 3.50 .27 .42 .64 .93 1.33

R507, 502, 404A 55.0 4.98 .40 .58 .95 1.32 1.87

12, 134a 90.9 3.65 .20 .37 .57 .87 1.30

1 5/8 22 90.0 4.96 .37 .59 .90 1.33 1.88

R507, 502, 404A 78.0 7.07 .56 .82 1.35 1.86 2.64

12, 134a 158 6.34 .34 .64 .98 1.51 2.24

2 1/8 22 156 8.61 .65 1.03 1.57 2.30 3.26

R507, 502, 404A 134 12.25 .98 1.43 2.35 3.23 4.58

12, 134a 244 9.78 .52 .99 1.51 2.32 3.47

2 5/8 22 241 13.70 1.01 1.59 2.42 3.54 5.03

R507, 502, 404A 209 18.92 1.51 2.21 3.62 5.00 7.07

12, 134a 348 13.97 .75 1.41 2.16 3.31 4.96

3 1/8 22 344 18.95 1.44 2.28 3.45 5.05 7.18

R507, 502, 404A 298 27.05 2.16 3.15 5.17 7.14 9.95

12, 134a 471 18.90 .99 1.91 2.92 4.48 6.69

3 5/8 22 465 25.60 1.94 3.08 4.67 6.83 9.74

R507, 502, 404A 403 36.50 2.92 4.25 6.97 19.65 13.67

12, 134a 612 24.56 1.29 2.49 3.81 5.84 8.75

4 1/8 22 605 33.40 2.53 4.01 6.08 8.90 12.70

R507, 502, 404A 526 47.57 3.80 5.55 9.09 12.58 17.80

°F -20°F0°F +20°F +40°F

11