17DA
Table of contents
Loading...
Number One
AirConditbning
Mater
Division of
Carrier Corporation
e
Carrier Parkway • Syracuse. N.Y. 13221
Open Centrifugal Refrigeration Machines
Centrifugal liquid chillers are designed to provide safe
and reliable service when operated within design speci
fications. When operating this equipment, use good
judgment and safety precautions to avoid damage to
equipment and property or injury to personnel.
Be sure you understand and follow the procedures and
safety precautions contained in the machine instructions
as well as those listed in this guide.
A DANGER
DO NOT USE OXYGEN to purge lines or to pressurize a
machine for any purpose. Oxygen gas reacts violently
with oil, grease and other common substances.
NEVER EXCEED specified test pressures. VERIFY the
allowable test pressure by checking the instruction
literature and the design pressures on the equipment
nameplate.
DO NOT VALVE OFF any safety device.
BE SURE that all pressure relief devices are properly
installed and functioning before operating any machine.
A WARNING
DO NOT USE eyebolts or eyebolt holes to rig machine
sections or the entire assembly.
DO NOT work on high voltage equipment unless you are
a qualified electrician.
DO NOT WORK ON electrical components, including
control panels, switches, starters or oil heater until you
are sure ALL POWER IS OFF and no residual voltage
can leak from capacitors or solid-state components.
LOCK OPEN AND TAG electrical circuits during servic
ing. IF WORK IS INTERRUPTED, confirm that all
circuits are de-energized before resuming work.
DO NOT syphon refrigerant by mouth.
AVOID SPILLING liquid refrigerant on skin or getting it
into the eyes. USE SAFETY GOGGLES. Wash any spills
from the skin with soap and water. If any enters the
eyes, IMMEDIATELY FLUSH EYES with water and
consult a physician.
NEVER APPLY an open flame or live steam to a
refrigerant cylinder. Dangerous overpressure can result.
When necessary to heat refrigerant, use only warm
(110 F/43 C) water.
DO NOT REUSE disposable (nonreturnable) cylinders
nor attempt to refill them. It is DANGEROUS AND
ILLEGAL. When cylinder is emptied, bleed off remain
ing gas pressure, loosen the collar and unscrew and
discard the valve stem. DO NOT INCINERATE.
CHECK THE REFRIGERANT TYPE before charging
machine. High pressure refrigerant in a low pressure
machine can cause vessels to rupture if the relief devices
cannot handle the refrigerant volume.
DO NOT ATTEMPT TO REMOVE fittings, covers, etc.
A SAFETY GUIDE
while machine is under pressure or while machine is
running. Be sure pressure is at zero psig before breaking
any refrigerant connection.
CAREFULLY INSPECT all relief valves, rupture discs
and other relief devices AT LEAST ONCE A YEAR. If
machine operates in a corrosive atmosphere, inspect the
devices at more frequent intervals.
DO NOT ATTEMPT TO REPAIR OR RECONDITION
any relief valve when corrosion or build-up of foreign
material (rust, dirt, scale, etc.) is found within the valve
body or mechanism. Replace the valve.
DO NOT VENT refrigerant relief valves within a
building; vent to outside. The accumulation of refriger
ant in an enclosed space can displace oxygen and cause
asphyxiation.
DO NOT install relief valves in series or backwards.
USE CARE when working near or in line with a.
compressed spring. Sudden release of the spring can
cause it and objects in its path to act as projectiles.
A CAUTION
DO NOT STEP on refrigerant lines. Broken lines can
whip about and cause personal injury.
DO NOT climb over a machine. Use platform, catwalk or
staging. Follow safe practices when using ladders.
USE MECHANICAL EQUIPMENT (crane, hoist, etc.) to
lift or move inspection covers or other heavy compo
nents. Even if components are light, use such equipment
when there is a risk of slipping or losing your balance.
DO NOT WELD OR FLAME CUT any refrigerant line or
vessel untü all refrigerant has been removed from the
vessel.
BE AWARE that certain automatic start arrangements
CAN ENGAGE THE STARTER. Open the disconnect
ahead of the starter in addition to shutting off the
machine or pump.
USE only repair or replacement parts that meet the code
requirements of the original equipment.
DO NOT VENT OR DRAIN water boxes containing
industrial brines, liquid, gases or semisolids without
permission of your Process Control Group.
DO NOT LOOSEN water box cover bolts until the water
box has been completely drained.
DOUBLE-CHECK that coupling nut wrenches, dial
indicators or other items have been removed before
rotating any shafts.
DO NOT LOOSEN a packing gland nut before checking
that the nut has a positive thread engagement.
PERIODICALLY INSPECT all valves, fittings and piping
for corrosion, rust, leaks or damage.
PROVIDE A DRAIN connection in the vent line near
each pressure relief device to prevent a build-up of
condensate or rain water.
© Carrier Corporation 1978
Form 17DA-2SS
CONTENTS
PAGE
INTRODUCTION 2
General 2
Factory Test 2
Job Data 2
Essential Tools 3
INSPECT AND ADJUST 3
Machine Room 3
Drive Arrangement 3
Piping 3
Wiring 3
Auxiliary Equipment Wiring 3
Turbine Drive Wiring 3
Gas Engine Drive Wiring 3
Safety Controls 3
Motor Drive 4
Turbine or Gas Engine Drive 4
Pumpout System 4
LEAK TEST AND DEHYDRATION 4
CHARGE MACHINE WITH WATER 4
CHARGE MACHINE WITH OIL 5
FINAL PREOPERATION ALIGNMENT
CHECK 5
OPERATE DRIVE 5
SET PURGE VALVES AND SWITCHES 5
CHECK WATER SUPPLY 5
CHECK AIR SUPPLY, PNEUMATIC
MACHINES 5
START-UP 5
Preoperation Settings 5
Drive Operation 5
Compressor Operation 5
Charge Refrigerant 6
HOT ALIGNMENT CHECK AND
DOWELING 7
INSTRUCT CUSTOMER OPERATOR 7
INTRODUCTION
General — All persons concerned with the start-up
and operation of the centrifugal refrigeration
machine should be familiar with the equipment
involved. This instruction book is intended to
cover general rules for start-up procedures.
Because of machine variations it is not possible
to prepare an instruction book covering all minor
details. This instruction book will fulfill normal
requirements. Additional information may be ob
tained by application to Carrier Machinery and
Systems Division Service Supervisor in the nearest
district office.
Special attention should be given to precaution
ary instructions emphasized in this book to avoid
start-up difficulties. These precautions are, in
general, applicable to all sizes of 17DA centrifugal
refrigeration machines.
Instructions for the prime mover if not in
cluded with Carrier Air Conditioning instructions
should be obtained from the manufacturer.
Factory Test — Prior to shipment, the compressor
is completely assembled and tested. Performance as
to lubrication, speed balance and general mechani
cal operation has been determined to be
satisfactory.
Job Data — consists of:
1. 17DA Start-Up Instructions
2. Blueprints showing:
a. Machine assembly
b. Machine wiring
c. Machine piping
d. Special controls, if any, and related wiring
3. 17DA Installation Instructions
4. 17DA Operation and Maintenance Instructions
%
5. Manufacturer’s Installation and Start-Up In
structions for:
a. Drive
b. Gear (if applicable)
Table 1 — Essential Tools
ITEM USE
1. Mechanic's tools
2. Día! indicators
3. Volt-ohmmeter 3. Calibrate controls
4. Drum charging valve
5. 5/8-inch SAE X 3/4-inch MPT adopter
6. 5 to 10 ft length of 5/8-lnch soft copper tubing with 5/8-inch
flare nut on each end
7. Halide leak detector or electronic leak detector'
8. Low-pressure indicator such as:
a. Absolute pressure manometer or
b. Vacuum indicator
9. Portable dehydration vacuum pump — 5 or 7.5 cfm capacity
10. 1/2-inch flare plug
1. Machine piping connections, control calibration
2. Check alignment
4, Refrigerant charging connection
5. Cooler charging valve
6. Charging line
7. Leak testing machine
8. Check machine dehydration
9. Dehydrating machine
10. Block purge suction line during leak testing
Essential Tools — See Table 1 for tools and
materials required to perform initial start-up.
INSPECT AND ADJUST
Machine Room — All installation work as outlined
in 17DA Installation Instructions book should be
completed, and all construction debris must be
removed from the immediate area of the
machinery prior to initial start-up of the machine.
Drive Arrangement — Inspect drive mounting,
location, couphng, speed rating, etc., for agreement
with job blueprints and specifications. Gear assem
bly (if used) must agree with installation recom
mendations outlined in gear manufacturer’s
instructions.
Piping — Check the following installations:
1. Refrigerant pumpout system
2. External or auxiliary oil system
3. All bypass lines and valves
4. Turbine drive piping, i.e.
a. Blowdown valves for each turbine stage
installed per manufacturer’s instructions.
b. Oil lubrication piping for speed control
installed in agreement with blueprints.
c. Steam supply Une condensate traps properly
installed to keep condensate out of turbine.
d. Proper supports on steam supply and ex
haust line to prevent stress or strain on the
turbine at operating temperatures.
5. Gas engine drive piping — Check the following
piping for agreement with job blueprints:
a. Gas pressure reducing valves with shutoff
valves.
Engine coolant piping with coolant thermo
b.
static valve installed so that water flows in
direction marked on valve.
c.
Oil cooler package piping
Exhaust piping
d.
WARNING: Exhaust piping is critical.
Refer to drive manufacturer’srecominendations for installation of exhaust piping.
Wiring — Refer to job wiring blueprints. All wiring
must agree with these prints.
AUXILIARY EQUIPMENT WIRING - Check the
following:
1. Brine pump
2. Condenser water pump
3. CooHng tower fan motor
4. Auxiliary oil pump
5. Oil heater
6. Overload selections in all motor starters. Over
load values must agree with motor nameplate
data.
TURBINE DRIVE WIRING - Check the
following:
1. Turbine solenoid trip mechanism.
Auxiliary oil pump if used. Check pump starter
2.
for proper voltage, amperage, and overload
setting. Operate pump to determine direction
of rotation. Do not operate dry of oil.
3.
Check job drawings for other electrical devices
used with the turbine. Ensure that their wiring
agrees with the job wiring blueprints.
GAS ENGINE DRIVE WIRING - All wiring must
agree with job wiring blueprints. Refer to engine
manufacturer’s instructions for starting techniques.
Safety Controls — It is good machinery practice to
preset safety controls using standard temperature
sources; i.e., ice baths, warm circulating oil baths
with standard calibrated thermometers. All con
trols must be rechecked during machine operation
and given final calibration as required. See Table 2
Control Settings and Fig. 1 17DA Safety Instru
ment Panel.
Check the following safety controls as shown
on job blueprints:
1. Main drive de-energizing devices, i.e.
a. Starter holding coil
b. Turbine solenoid trip, etc.
2. Brine low-temperature cutout
3. Refrigerant low-pressure cutout
Loading...