Turboair ADR042 User manual

Turbo air Speeds Up the Pace of Innovation
Part No. KUCTB2503
Refrigeration System
Installation & Operation Manual
Please read this manual completely before attempting to install or operate this equipment !
Unit Cooler
Condensing Unit

2
CONTENTS
Safety Information …………………………………… 3
Inspection ……………………………………………… 3
Locating Unit Cooler ………………………………… 4
Unit Cooler Piping …………………………………… 6
Expansion Valve Selection ………………………… 7
Defrost ………………………………………………… 10
Locating and Mounting Condensing Unit ……… 12
System Operation …………………………………… 13
Unit Cooler Troubleshooting ……………………… 15
System Troubleshooting …………………………… 17
Field Wiring …………………………………………… 19

3
Safety Information
Be sure all power sources are turned off before checking the electric wiring or
appliances to avoid electric shock.
Do not run fan if cover or case is removed. This is to avoid electric shock.
All units are pressurized with dry air or nitrogen gas. All units must be evacuated
before charging the system with refrigerant. Keep finger away from moving parts.
Avoid touching refrigerant lines. Some parts are very hot and can cause burns.
Avoid contacting sharp edges or coil surface that are a potential injury hazard.
Avoid touching the units or electric box in wet hands to prevent electric shock.
Please call the specialized installation company or trained personnel when you installing,
moving, operating of the unit.
Field wiring must confirm to the requirements of units’ electric specification.
Inspection
A person at the job site to receive material holds responsibility. Each shipment should
be carefully inspected against the bill of lading. The shipping receipt should not be
signed before careful inspection. Check carefully for concealed damage. Any shortage
or damages should be reported to the delivering carrier. Damaged material becomes the
delivering carrier’s responsibility, and should not be returned to Turbo air unless prior
approval is given. Check the serial tag information with invoice. Report any
discrepancies to Turbo air sales representatives.

4
Locating Unit Cooler.
Minimum space required for Unit Cooler.
Figure 1. One evaporator
H
H
H
Figure 2. Two or more evaporators
H2H
H H
H
※H=Space Required, Unit Cooler Height
Recommended location methods of Unit Cooler.
1. Avoid placing Unit Cooler close to doors. Install like Figure 3 or Figure 4.
2. Avoid having them face each other when installing multiple units. Install like Figure 5
3. Recommended placement when installing multiple units see Figure 6.
( H= Sapce Required, Unit Cooler Height )
Figure 3
door
Figure 4
door
Figure 5
door
Figure 6
door
2H
2H

5
Locate evaporators so that air pattern
covers all of the room. Do not restrict the
inlet or outlet air stream. When installed,
there should be 12”clearance from
bottom of the unit. Always avoid
placement of unit coolers directly above
doors and door openings.
Most evaporators can be mounted with
rod hangers, lag screws or bolts. (use
3/8” and 5/8” stainless steel bolts) Refer
to Figure 7. Mount the unit level so that
condensate drains properly. When using
rod hangers, allow adequate space
between the top of the unit and the
ceiling. (NSF Standard 7). The area
above the unit cooler must be sealed or
exposed in such away to allow hand
cleaning without the use of tools. When
lagging or bolting unit flush to the
ceilings, seal the joint between the top
and the ceiling with an NSF listed sealant.
Ends of open hanger channels must be
sealed to prevent accumulation of foreign
material.
Refer to Figures 1 through 4. Air flow
distance must be considered when
coolers or freezers will not accommodate
all required evaporators on one wall.
Refer to Figure 7. Traps on low
temperature units must be outside of
refrigerated enclosures. Traps subject to
freezing temperatures must be wrapped
with heat tape and insulated.
Figure 7. Unit Cooler Installation Diagram.
BOLTS
LOCK NUTS
NUTS
PIPE HEATER

6
Unit Cooler Piping.
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 only a suitable silver solder alloy on
suction and liquid lines. All piping must
be adequately supported to prevent
vibration and breaking.
Tube clamps should have a gasket
surface to prevent abrasion.
The system as supplied by Turbo air was
thoroughly cleaned and dehydrated at the
factory.
Foreign matter may enter the system by
way of the evaporator to condensing unit
piping.
Therefore, care must be used during
installation of the piping to prevent
entrance of foreign matter.
Use only refrigeration grade copper
tubing properly sealed against
contamination.
Figure 8. Suction piping installation on an
evaporator.
Figure 9. suction piping installation on
multiple evaporators.
Figure 10. Installation of expansion valve
bulb.
Refer to Figure 8 through 9. Suction line
risers must be carefully selected, have an
oil trap at the bottom and at 15 foot
intervals up the riser. They should be the
same size as the vertical riser connected
to its outlet. Riser should not be larger in
diameter than horizontal runs.
Refer to Figure 10.
Expansion valves are supplied with clamp
for securing bulb to the suction line. The
bulb must be secured at the evaporator
outlet, on the side of a horizontal run of
suction line, before any trap.

7
Do not over tighten bulb clamps or
deform the bulb in anyway. Install all
refrigeration system components in
accordance with applicable local and
national codes and in conformance with
good practice required for the proper
operation of the system.
All piping must be protected where it
passes through walls or ceilings.
Precautions should be taken to see that
the piping does not touch any structural
the transmission of vibration into the
building.
The piping chase must be thoroughly
sealed to protect the tube and prevent
ambient air from entering the refrigerated
space. Seal around the drain line where it
passes through the wall. Air leaks can
cause equipment problems. Damage the
structure and product, increase load,
increase operating cast, and can cause a
safely hazard. Eliminate all air leaks.

8
Expansion valve selection.
Expansion valve selection for each model (Table 1)
Table 1 refer to Sporlan and Alco, other expansion valve be referred to their catalogue.
Table 1. Expansion Valve Specs by Model.
MODEL
CAPACITY
(BTUH)
Refrigerant
Evap. Temp
(°F/°C)
EXPANSION VALVE
SPORLAN ALCO
ADR042 4200
R-404A 25 / -4
SBFSE-A-C HFESC-1/4-SC
ADR068 6800 SBFSE-A-C HFESC-1/2-SC
ADR073 7300 SBFSE-A-C HFESC-1/2-SC
ADR109 10900 SBFSE-A-C HFESC-1-SC
ADR136 13600 SBFSE-A-C HFESC-1 1/4-SC
ADR163 16300 SBFSE-B-C HFESC-1 1/4-SC
ADR196 19600 SBFSE-B-C HFESC-1 1/2-SC
ADR218 21800 SBFSE-B-C HFESC-1 1/2-SC
ADR273 27300 SBFSE-C-C HFESC-2-SC
ADR393 39300 SBFSE-C-C HFESC-3 1/2-SC
LED042 4200
R-404A -20 /-29
SBFSE-A-Z HFESC-1/2-SZ
LED068 6800 SBFSE-A-Z HFESC-1-SZ
LED082 8200 SBFSE-A-Z HFESC-1-SZ
LED094 9400 SBFSE-A-Z HFESC-1-SZ
LED126 12600 SBFSE-B-Z HFESC-1 1/4-SZ
LED147 14700 SBFSE-B-Z HFESC-1 1/2-SZ
LED168 16800 SBFSE-B-Z HFESC-2-SZ
LED189 18900 SBFSE-B-Z HFESC-2-SZ
LED210 21000 SBFSE-B-Z HFESC-2-SZ
LED252 25200 SBFSE-B-Z HFESC-3 1/2-SZ
LED300 30000 SBFSE-B-Z HFESC-3 1/2-SZ
MODEL
CAPACITY
(BTUH)
Refrigerant
Evap. Temp
(°F/°C)
EXPANSION VALVE
SPORLAN
ADM131 13100
R-404A 25 / -4
SBFSE-A-C
ADM162 16200 SBFSE-A-C
ADM248 24800 SSE3C

9
ADM321 32100 SSE3C
ADM370 37000 SSE4C
ADM480 48000 SSE4C
ADM567 56700 SSE6C
ADM638 63800 SSE6C
MED105 10500
R-404A -20 /-29
SBFSE-A-Z
MED144 14400 SBFSE-B-Z
MED207 20700 SSE-3-Z
MED275 27500 SSE-4-Z
MED317 31700 SSE-4-Z
MED410 41000 SSE-6-Z
MED513 51300 SSE-7-Z
MED547 54700 SSE-7-Z
MLD103 10300 SBFSE-A-Z
MLD165 16500 SBFSE-B-Z
MLD220 22000 SSE-3-Z
MLD253 25300 SSE-3-Z
MLD332 33200 SSE-4-Z
MLD388 38800 SSE-6-Z
MLD442 44200 SSE-6-Z
TTA056 5600
R-404A 25 / -4
SBFSE-A-C
TTA084 8400 SBFSE-A-C
TTA112 11200 SBFSE-A-C
TTA141 14100 SBFSE-B-C
TTA175 17500 SBFSE-B-C
TTE049 4900
R-404A -10 /-23
SBFSE-A-Z
TTE074 7400 SBFSE-A-Z
TTE099 9900 SBFSE-A-Z
TTE124 12400 SBFSE-B-Z
TTE138 13800 SBFSE-B-Z
MODEL
CAPACITY
(BTUH)
Refrigerant
Evap. Temp
(°F/°C)
EXPANSION VALVE
SPORLAN
TCA058 5800
R-404A 25 / -4
SBFSE-A-C
TCA087 8700 SBFSE-A-C
TCA106 10600 SBFSE-A-C

10
TCA140 14000 SBFSE-B-C
TCA178 17800 SBFSE-B-C
TCA197 19700 SBFSE-B-C
TCA213 21300 SBFSE-C-C
TCA284 28400 SBFSE-C-C
TCA356 35600 SBFSE-C-C
TCE058 5800
R-404A 25 / -4
SBFSE-A-Z
TCE087 8700 SBFSE-A-Z
TCE106 10600 SBFSE-A-Z
TCE140 14000 SBFSE-B-Z
TCE178 17800 SBFSE-B-Z
TCE197 19700 SBFSE-B-Z
TCE213 21300 SBFSE-B-Z
TCE284 28400 SBFSE-B-Z
TCE356 35600 SBFSE-B-Z
Table 2. Recommended line size for suction diameter. ( R-404A)
SYSTEM
CAPACITY
BTUH
SUCTION TEMPERATURE
+30。F +20。F +10。F -10。F
30’
75’
100’
150’
30’
75’
100’
150’
30’
75’
100’
150’
30’
75’
100’
150’
3000 3/8 3/8 1/2 1/2 3/8 1/2 1/2 1/2 1/2 1/2 1/2 5/8 1/2 5/8 5/8 5/8
4000 3/8 3/8 1/2 1/2 1/2 1/2 1/2 5/8 1/2 1/2 5/8 5/8 1/2 5/8 5/8 7/8
6000 1/2 1/2 5/8 5/8 1/2 5/8 5/8 7/8 1/2 5/8 5/8 7/8 5/8 5/8 7/8 7/8
9000 1/2 5/8 7/8 7/8 5/8 7/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 7/8 7/8
12000 1/2 5/8 7/8 7/8 5/8 7/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 7/8 1 1/8
15000 5/8 5/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 7/8 1 1/8 7/8 7/8 1 1/8 1 1/8
18000 5/8 7/8 7/8 7/8 7/8 7/8 7/8 1 1/8 7/8 7/8 1 1/8 1 1/8 7/8 1 1/8 1 1/8 1 1/8
24000 5/8 7/8 7/8 7/8 7/8 7/8 1 1/8 1 1/8 7/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 3/8
30000 7/8 7/8 7/8 1 1/8 7/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 3/8 1 1/8 1 1/8 1 3/8 1 3/8
36000 7/8 7/8 1 1/8 1 1/8 7/8 1 1/8 1 1/8 1 3/8 1 1/8 1 1/8 1 3/8 1 3/8 1 1/8 1 3/8 1 3/8 1 3/8
42000 7/8 1 1/8 1 1/8 1 3/8 1 1/8 1 1/8 1 3/8 1 3/8 1 1/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 1 5/8
48000 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8
54000 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8
60000 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8
66000 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8
SYSTEM
CAPACITY
BTUH
SUCTION TEMPERATURE
-20。F -30。F -40。F LIQUID LINE SIZE
30’
75’
100’
150’
30’
75’
100’
150’
30’
75’
100’
150’
30’
75’
100’
150’
3000 1/2 5/8 5/8 5/8 1/2 5/8 5/8 7/8 5/8 5/8 7/8 7/8 3/8 3/8 3/8 3/8

11
4000 1/2 5/8 5/8 5/8 5/8 5/8 7/8 7/8 5/8 5/8 7/8 7/8 3/8 3/8 3/8 3/8
6000 5/8 7/8 7/8 7/8 5/8 7/8 7/8 7/8 7/8 7/8 1 1/8 1 1/8 3/8 3/8 3/8 3/8
9000 5/8 7/8 7/8 1 1/8 7/8 7/8 7/8 1 1/8 7/8 7/8 1 1/8 1 1/8 3/8 3/8 3/8 3/8
12000 7/8 7/8 1 1/8 1 1/8 7/8 7/8 1 1/8 1 1/8 1 1/8 7/8 1 3/8 1 3/8 3/8 3/8 3/8 3/8
15000 7/8 1 1/8 1 1/8 1 1/8 7/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 3/8 1 3/8 3/8 3/8 3/8 1/2
18000 7/8 1 1/8 1 1/8 1 3/8 7/8 1 1/8 1 1/8 1 3/8 1 1/8 1 1/8 1 3/8 1 3/8 3/8 3/8 1/2 1/2
24000 1 1/8 1 1/8 1 1/8 1 3/8 1 1/8 1 1/8 1 3/8 1 3/8 1 1/8 1 1/8 1 5/8 1 5/8 3/8 1/2 1/2 1/2
30000 1 1/8 1 1/8 1 3/8 1 3/8 1 1/8 1 3/8 1 3/8 1 3/8 1 1/8 1 3/8 1 5/8 1 5/8 1/2 1/2 1/2 5/8
36000 1 1/8 1 3/8 1 3/8 1 5/8 1 3/8 1 3/8 1 3/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1/2 1/2 1/2 5/8
42000 1 3/8 1 3/8 1 3/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1/2 1/2 5/8 5/8
48000 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1/2 1/2 5/8 5/8
54000 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1/2 1/2 5/8 5/8
60000 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1/2 1/2 5/8 5/8
66000 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1 3/8 1 3/8 1 5/8 1 5/8 1/2 1/2 5/8 5/8
1. All line size are basic for O.D type L copper tube. The above table is maximum suction size and
riser size should not exceed horizontal size.
2. Suction line size should be selected at pressure drop equivalent to 2。F, and reduce estimate
of system capacity accordingly.
3. For easy oil return, use U trap in suction line.
4. Consider double suction risers, if capacity control can reduce capacity 35%below.
DEFROST
Once ice forms in an evaporator coil it keeps building more ice and eventually will lead
to equipment failure if not manually defrosted.
Some symptoms of ice forming in the coil are:
1. loss of air circulation and air throw
2. loss of room temperature.
3. no off-cycle time.
4. flood back.
5. water spitting out of the fans or coil on air defrost systems.
Long term ice formation will crush the refrigerant tubes in the coil causing leaks and
major equipment problems. If ice formation is suspected, carefully check the interior
rows of the coil with a good light. Ice formation usually starts at the bottom of the coil
in the middle rows and can be difficult to detect.
For most applications, two to four defrost cycles per day should be adequate. The
defrost requirements will vary on each installation so the defrost settings should be
determined by observing the system operation.
Air defrost
The normal “off cycle” of the compressor may be adequate to keep the evaporator

12
coil clear of frost. In other applications, a
defrost timer may be necessary to help
assure a clear coil in a medium
temperature environment, “Air defrost” is
initiated by the timer, but the evaporator
fans continue to operate to facilitate the
melting of frost on the fan surface. Other
types of defrost schemes require that the
fans on the evaporator shut off during the
defrost period.
Electric defrost
The recommended electric defrost
circuitry is typically using a defrost
heater.
During defrost cycle, compressor and fan
are stopped automatically by the timer at
predetermined times.
In generally, electric defrost uses defrost
timer for preventing over heating.
There are two kinds defrost timers.
Turbo air uses bimetal method.
During the defrost cycle, if the room
temperature rises above the desired
setting, defrost heater will turn off
automatically and if the room temperature
drops lower than desired temperature,
Defrost heater will turn off.
If the defrost time finished, defrost timer
will turn on and the compressor and fans
will run continuously.
At this time, fan power is supplied later
than compressor power by fan delay
thermostat. If it does not, a partial defrost
results and the residual water and slush
will re-freeze into ice during the next
cycle. Ice removal will require a manual
defrost.
Defrost Thermostat
Bimetal Disc Type
Turbo air uses Klixon type thermostat
made by Texas Instruments Company.
This thermostat terminates defrost at
50℉(10℃) and prevents the fans from
running when the coil temperature is
above 40℉(4.4℃). And defrost
termination/fan delay thermostat
terminates defrost at 55℉(12.8℃) after
defrost is finished.
This will allow fan delay time for
eliminating the residual water and slush
in the evaporator coil.
Fan delay time can be eliminated by
jumping the fan switch contacts. This will
allow the fans to start immediately after
defrost termination. This will disable the
fan delay.
When the coil temperature reaches
approximately 40℉(1.7℃), fan delay is
sends a signal to the control circuit, and
it will run fan motor. If you wish to
control fan delay time and defrost
termination time, adjust the position of
thermostat. If this method is used, it will
result in higher temperature.

13
Adjustable Type ( F25 Series )
The F25 Control terminates defrost and
delays evaporator fan operation following
a defrost cycle. The coil temperature
rises during the defrost cycle to the
control cut-out setting. At this setting the
defrost cycle terminates and refrigeration
starts. The fan remains off during the
initial start-up of the refrigeration cycle.
When the coil temperature drops to the
control cut-in setting, the fan is turned
on. The delayed fan operation prevents
warm moist air from being circulated into
the controlled space and danger of
increased vapor pressure and product
damage is eliminated.
Defrost Timer Setting
Turbo air uses 8145-20B type timer
made by Paragon company.
Timer should be set correctly. Determine
the number of defrosts per day and the
best time of day for it to occur. Insert
pins accordingly. Set the fail-safe time to
terminate the defrost a few minutes
beyond the estimated temperature
termination time. Air defrost termination
time is usually 30 to 50 minutes. The
colder the room, the longer the fail-safe
time required. Electric defrost systems
normally have a 25 to 40 minute fail-safe
time.
Head Pressure Control
A. Head Pressure Control Valve System (Standard Models)
The standard valve used on high pressure refrigerant systems controls the head
pressure at approximately 180 PSIG.
B. Fan Cycle Pressure Control System (Model “-A”)
Pressure Settings
Evaporator Temp.Range Fan No
Pressure Switch 1 (PSIG) Pressure Switch 2 (PSIG)
OFF ON OFF ON
High (40 to 0 °F) 1, 2 157 228 - -
Extended (30 to -25 °F) &
Extra Low (0 to -40 °F)
1 - - 100 157
2 157 228 100 157

14
Locating and Mounting Condensing Unit
Locating Condensing Unit.
Condensing Unit must be located and
installed where there is an unrestricted
area. Avoid areas where there are
corrosive vapors or flammable materials.
Avoid locating units too close to walls.
Fan intake and discharge air space should
be at least 1m and 2m from wall. Other
sides should be at least 0.5m from wall.
No impediments should be located in
front of condensing units intake and
discharge.
If above is not followed correctly noise
and inadequate air flow may result.
Condensing units should be located away
from general public and the street.
Make sure units are kept horizontal.
Mounting Condensing Unit.
Mounting base should be concrete or
steel sufficient to support between 2 to 5
times the weight of condensing unit.
Condensing units must be mounted using
pads to avoid vibration or shifting.
The anchor bolts should be used to fix
the unit and tightened with spring washer
and nuts.
Spring Mounted Compressor.
Semi-hermetic compressor unit use the mounting assembly shown in Figure 11, the
shipping spacer is to be in place during shipment to insure maximum support for the
compressor body during transit.
Before the unit is put in operation, the shipping spacer should be removed and discarded.
Before operating the unit, it is necessary to follow these steps.
1. Remove the upper nuts and washers.
2. Remove and discard the shipping spacers.
3. Install the rubber spacer. (rubber spacer tied to compressor.)
4. Replace the upper mounting nuts and washers.
5. Allow 1/16” between the upper nut and the rubber spacer as
Figure 11
.

15
Figure 11. Spring Mount.

16
System Operation.
Evaporator Superheat.
Evaporator superheat is generated from
the compressor suction line reducing
system efficiency.
Normally 6℉to 12℉is acceptable on
most refrigeration systems. Preferably,
6℉to 8℉on low temperature systems
and 8℉to 10℉on medium temperature
systems are desired. For systems
operating at higher temperatures, the
superheat can be adjusted to 12℉to 15℉
as required.
The method of measuring evaporator
superheat is found by P-T method.
Obtain evaporator superheat by
measuring the suction line temperature at
the expansion valve bulb. Obtain pressure
at a Schrader fitting in the evaporator
suction connection area, near the
expansion valve bulb, and convert to
temperature with a P-T chart.
Subtract the converted temperature from
the measured temperature and the
difference is superheat at the
evaporator. Obtain the desired
superheat by adjusting the expansion
valve.
Evaporator superheat greater than 14℉
can substantially reduce system capacity,
while superheat less than 4℉has the
potential for flood back.
Compressor Superheat.
Compressor superheat has an effect on
system capacity and efficiency.
Compressor superheat affects
compressor life and recommends a
minimum of 20℉superheat at the
compressor. Too low a compressor
superheat can permit liquid return to the
compressor causing damage.
Too high a compressor superheat can
cause high discharge temperature,
resulting in lubricant breakdown,
compressor overheating and can lead to
compressor damage or failure.
Compressor superheat can be changed by
adjusting the expansion valve, adding a
suction-liquid line heat exchanger.
Obtain compressor superheat by
measuring the suction line temperature
about 6 to 12 inches from the compressor
service valve.
Obtain pressure at the suction service
valve and convert to temperature with a
P-T chart. Subtract the converted
temperature from the measured
temperature and the difference is
superheat at the compressor.

17
Refrigerant Charging.
When charging a system with refrigerant
that is in a vacuum with vacuum pump,
the above process is very important to
remove moisture inside system. The
moisture can cause system damage or
failure.
Charge refrigerant into a system through
a filter/drier in the charging line. This
extra drier will insure that all refrigerant
supplied to the system is clean and dry.
Weigh the refrigerant drum before
charging so an accurate record can be
kept of the weight of refrigerant put in
the system. Liquid refrigerant can be
added directly into the receiver tank and
charging 90% of system refrigerant
capacity.
Start the system and finish charging until
the sight glass indicates a full charge and
the proper amount have been weighed in.
If the refrigerant must be added to the
system through the suction side of the
compressor, charge in vapor form only.
Liquid charging must be done in the high
side only and with liquid metering devices.
If R-404A is used, liquid must be charged
and read up refrigerant explanatory.
Start-up.
Use the following operating procedure after the installation has been completed,.
1) Check all electrical and refrigerant connections. Check if the electrical status is
in manual and if there are no holes in the refrigerant lines. Start-up
2) Check all fans on the evaporator and condensing unit to be sure they are
operational and turning the proper direction.
3) Check high and low pressure switch, pressure regulating valves, and adjust if
necessary.
4) Continue charging until system has sufficient refrigerant for proper operation.
Do not overcharge. Bubbles in a sight glass may be caused by a restriction as
well as a shortage of refrigerant. Check service valve and open if refrigerant is
sufficiently charged and you still have bubbles in the sight glass.
5) Observe system and do not leave unit unattended until the system has reached
normal operating conditions.
WARNING : SCROLL COMPRESSOR IS DIRECTIONAL
DEPENDENT. IF NOISY, SWITCH ANY TWO SUPPLY LINES.

18
Unit Cooler troubleshooting.
Symptoms Possible causes Solution
Cooling is
insufficient.
(Room
temperature too
high.)
I
nsufficient refrigerant
A
dd refrigerant
T
oo much oil in unit cooler
C
heck the easy oil return
in
suction line.
S
uperheat too high
A
djust expansion valve.
R
oom thermostat set too high
A
djust thermostat
C
oil iced-up
M
anually defrost coil. C
heck
defrost time, period, controls.
D
efective distributor
R
eplace.
Uneven coil
frosting.
D
efective distributor
R
eplace
D
efective heater
R
eplace
D
efrost termination set too low
Adjust defrost termination setting
higher and move defrost
thermostat.
Ice build up in
coil quickly
F
in spaced too narrow
R
eplace coil
E
vaporating temperature too low
A
djust expansion valve
D
ecrease of air volume
C
heck fan and clean air filter
U
nit cooler capacity is too small
R
eplace unit cooler
Fan not
operating
M
ain switch open
C
lose switch
B
lown fuses
R
eplace fuses. C
heck for short
circuits or overload conditions
D
efective motor
R
eplace motor
D
efe
ctive timer or defrost
thermostat
R
eplace defective component
U
nit in defrost cycle
W
ait for completion of cycle
Coil does not get cold enough to
reset thermostat.
Adjust fan delay setting of
thermostat.
Ice accumulating
in drain panel
D
efective heater
R
eplace heater
D
rain line plugged
C
lean drain line
D
efective drain line heater
R
eplace heater
Defective timer or defrost
thermostat
R
eplace defective component.

19
Symptoms Possible causes Solution
Coil not clearing
of frost during
defrost cycle
C
oi
l temperature not getting above
freezing point during defrost.
C
heck heater operation
I
nsufficient defrost period
Adjust timer or more defrost
cycle
D
efrost cycle too short
Adjust defrost thermostat or
timer for longer cycle
D
efective timer or defros
t
thermostat
R
eplace defective component
Ice accumulating
on
ceiling ,around
evaporator, on
fan guard, or
blades.
D
efrost time is too long
Adjust defrost termination
thermostat.
Not delaying fans after defrost
period.
C
heck fan delaying thermostat
D
ef
ective defrost thermostat or
timer.
R
eplace defective component
T
oo many defrosts
R
educe the number of defrosts

20
System troubleshooting.
symptoms Possible causes Solution
Compressor
not running
M
ain switch open
C
lose switch
B
lown fuse
Check electrical circuits and
motor winding for shorts or
grounds.
Replace fuse after fault is
corrected.
L
oose wiring
C
heck all wire junctions. T
ighten
all terminal screws.
S
ystem cable shut down
R
eplace shutdown cable.
T
hermal overload tripped
Overloads are automatically
reset.
C
heck unit when unit come
back on line.
D
efective contactor or contactor coil
R
eplace or repair
S
ystem shut down by safety devices.
C
heck cause of shut down
L
iquid line solenoid not open
R
epair or replace coil
Noisy
Compressor
Flooding of liquid refrigerant into
crankcase
C
heck expansion valve setting
Improper piping support on suction or
liquid line.
R
elocate add hangers.
W
orn compressor.
R
eplace compressor
High
discharge
pressure.
N
on-condensable in system.
R
emove non-condensable.
T
oo much refrigerant
R
emove excess refrigerant
Discharge shut off valve partially
closed
O
pen valve
F
an not running
C
heck electrical circuit and fuse.
D
irty condenser coil
C
lean condenser coil
Low discharge
pressure.
F
aulty condenser temperature controls
C
heck head pressure control
S
uction shut off valve partially closed
O
pen valve
I
nsufficient refrigerant
C
heck leaks. Add charge.
L
ow suction pressure
See corrective steps for low
suction pressure.