nvent VA14 User manual

© 2022 nVent Electrical Products China 89220028
Rev. B P/N 90452821
V-SERIES
Air Conditioner
VA14 Model
INSTRUCTION MANUAL

© 2022 nVent Electrical Products China 89220028 - 2 -
WARRANTY AND RETURN POLICY
https://hoffman.nvent.com/en/hoffman/warranty-information
TABLE OF CONTENTS
WARRANTY AND RETURN POLICY ............................................................................................................................................2
RECEIVING THE AIR CONDITIONER ..........................................................................................................................................3
HANDLING AND TESTING THE AIR CONDITIONER..................................................................................................................3
HOW TO READ MODEL NUMBERS.............................................................................................................................................3
INSTALLATION INSTRUCTIONS .................................................................................................................................................4
Dimensional Drawing ................................................................................................................................................................................ 4
Mounting Cutout Dimensions.................................................................................................................................................................... 5
TECHNICAL INFORMATION........................................................................................................................................................6
Sequence of Operation .............................................................................................................................................................................. 6
Heating (optional)............................................................................................................................................................................... 6
Cooling................................................................................................................................................................................................ 6
Standard and Optional Component Operation.......................................................................................................................................... 6
Thermostat......................................................................................................................................................................................... 6
Head Pressure Control (optional)...................................................................................................................................................... 6
For cooling (35°C range):................................................................................................................................................................... 6
For heating (13°C range): .................................................................................................................................................................. 6
Unit Characteristics................................................................................................................................................................................... 7
WIRE DIAGRAMS .........................................................................................................................................................................8
VA14 Generic Wire Diagram (actual unit options may vary)..................................................................................................................... 8
Schematics................................................................................................................................................................................................. 9
Components List........................................................................................................................................................................................ 9
MAINTENANCE..........................................................................................................................................................................10
Compressor ............................................................................................................................................................................................. 10
Inlet Air Filter........................................................................................................................................................................................... 10
How To Remove, Clean or Install a New Inlet Air Filter......................................................................................................................... 10
Condenser and Evaporator Air Movers................................................................................................................................................... 11
Refrigerant Loss ...................................................................................................................................................................................... 11
TROUBLE SHOOTING................................................................................................................................................................12
Basic Air Conditioning Trouble Shooting Check List.............................................................................................................................. 12
Symptoms and Possible Causes:............................................................................................................................................................ 13

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RECEIVING THE AIR CONDITIONER
Inspect the air conditioner. Check for concealed damage that may have occurred during shipment. Look for
dents,scratches, loose assemblies, evidence of oil, etc. Damage evident upon receipt should be noted on the
freight bill. Damage should be brought to the attention of the delivering carrier -- NOT to nVent Electrical Products
China -- within 15 days of delivery. Save the carton and packing material and request an inspection. Then le a
claim with the delivering carrier.
nVent Electrical Products China cannot accept responsibility for freight damages; however, we will assist you in
any way possible.
HANDLING AND TESTING THE AIR CONDITIONER
If the air conditioner has been in a horizontal position, be certain it is placed in an upright, vertical or mounting
position for a minimum of ve (5) minutes before operating.
Do not attempt to operate the air conditioner while it is horizontal
or on its side, back or front. The refrigeration compressor is lled
with lubricating oil. This will cause permanent damage to the air
conditioner and also voids the warranty.
CAUTION
TEST FOR FUNCTIONALITY BEFORE MOUNTING THE AIR CONDITIONER TO THE ENCLOSURE.
Refer to the nameplate for proper electrical current requirements, and then connect the power cord to a properly
grounded power supply. Minimum circuit ampacity should be at least 125% of the amperage shown in the
design data section for the appropriate model. No other equipment should be connected to this circuit to prevent
overloading.
Immediately after applying power the evaporator blower (enclosure air) should start running. Operate the air
conditioner with the compressor running for ve (5) to ten (10) minutes. No excessive noise or vibration should
be evident during this run period. You will need to set the cooling thermostat below the ambient temperature to
operate the compressor.
Condenser air temperatures should be warmer than normal room temperatures within a few minutes after the
condenser impeller starts.
See sequence of operation for specics on how the unit operates when powered up.
HOW TO READ MODEL NUMBERS
VA14 30 25 G052 A
1 2 3 4 5 6
1. Identies the type/family of air conditioner and the approximate height (i.e.VA14 = Value family
about 1301mm to 1400mm high).
2. This is the air conditioner’s listed capacity in Watt at rated conditions. (i.e. 30 = 3000 Watt at 35°C
ENCLOSURE 35°C ambient.)
3. 2 = 220/230 Volt,5=50Hz.
4. Identies the construction material and refrigerant of air conditioner.(i.e.G=Galvanized Sheet Metal
and R134a).
5. Unique set of numbers for each air conditioner which identies the accessories on a model.
6. A=The updated version

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INSTALLATION INSTRUCTIONS
1. Inspect the air conditioner and verify correct functionality before mounting the air conditioner. See
HANDLING AND TESTING THE AIR CONDITIONER on page 3.
2. Using the mounting gasket kit provided with the unit, install gaskets to the air conditioner, Figure
22.
3. Mount air conditioner on enclosure taking care not to damage the mounting gasket. The mounting
gasket is the seal between the air conditioner and the enclosure. Avoid dragging the air conditioner
on the enclosure with the mounting gasket attached as this could cause rips or tears in the gasket
and risk losing the water tight seal.
4. Allow unit to remain upright for a minimum of ve (5) minutes before starting. CAUTION! Air
conditioner must be in upright position during operation.
5. Refer to the nameplate for electrical requirements. Wire the unit to a properly grounded power
supply. Electrical circuit should be fused with slow blow or HACR circuit breaker.
6. Set thermostat for required cabinet temperature. Refer to Sequence of Operation on page 6 for
thermostat adjustment and operation.
DIMENSIONAL DRAWING
Figure 1 (External mounting dimensional drawing)

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MOUNTING CUTOUT DIMENSIONS
435.0
406.4(6)
1337.6
340.0364.8
489.0
41.8250.8250.8250.8250.8250.8
Ø8(12x)
381.0
391.0
16.2
External Mounting
Figure 2
CUTOUT INSTRUCTIONS
(As viewed from outside of enclosure)
NOTE: Dashed lines represent air conditioner.

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TECHNICAL INFORMATION
SEQUENCE OF OPERATION
The air conditioner comes standard with one internally mounted thermostat. There is one mode of operation; only
cooling. During cooling mode the evaporator fan will be running.
HEATING (OPTIONAL)
When the enclosure temperature is below the heating thermostat setpoint, power is applied to the heater.
When the enclosure temperature is 5°C degrees above the setpoint the heater is powered off.
COOLING
When the enclosure temperature is above the cooling thermostat setpoint, power is applied through
the thermostat. The compressor is then energized either directly. The condenser impeller will start
immediately if the unit is not equipped with an optional head pressure control switch. If the unit is
equipped with an optional head pressure control switch, the condenser impeller will start once the
refrigerant pressure reaches the setting of the switch. Component specic information is listed below.
Operating the air conditioner below the minimum ambient temperature or above the maximum ambient
temperatures indicated on the nameplate voids all warranties. DO NOT set the enclosure thermostat to a
temperature lower than 21°C. Doing so can increase the likelihood of frost buildup on the evaporator coil.
The moisture that the enclosure air can contain is limited. If moisture ows from the drain tube
continuously, this can only mean that ambient air is entering the enclosure. Be aware that frequent
opening of the enclosure’s door admits humid air that the air conditioner must then dehumidify.
STANDARD AND OPTIONAL COMPONENT OPERATION
THERMOSTAT
The VA14 air conditioner uses our standard 3204580 thermostat. The thermostat setpoint equals the
temperature that the air conditioner turns off. The thermostat has a 5°C differential from setpoint until it
calls for cooling or heating. An example of operation is shown below.
FOR COOLING (35°C RANGE):
• Tstat setpoint = 35°C
• Cooling turns on at 40°C
• Cooling turns off at 35°C
FOR HEATING (13°C RANGE):
• Tstat setpoint = 13°C
• Heating turns on at 13°C
• Heating turns off at 18°C
NOTE: For testing purposes only, the thermostat stop screw may be removed (on units so
equipped) to allow settings below 21°C. After testing, replace the stop screw and verify that
the thermostat can not be set below 21°C. Extended operation below 21°C can cause coil
freeze ups resulting in reduced load and/or unit damage.
HEAD PRESSURE CONTROL (OPTIONAL)
Unit is set at the factory, no adjustment necessary.
At a saturated condenser temperature of 48°C (1.14 MPa), the condenser fan will power on. At a
saturated condenser temperature of 29°C (0.66 MPa), the condenser fan will power off.

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UNIT CHARACTERISTICS
Model
VA143025GXXXA VA144025GXXXA
Dimensional Data
Height(mm) 1338 1338
Width(mm) 435 435
Depth(mm) 300 320
Unit Weight(kg) 66 72
IP Code IP56 internal loop
IP34 external loop IP56 internal loop IP34 external loop
Cooling Data
Refrigerant R134a R134a
Refrigerant Charge (g) 1000 1200
Cooling Capacity (W ),L35 L35 3176 3815
Cooling Capacity (W ),L35 L50 2534 3539
Maximum Ambient Temp (°C) 55 55
Minimum Ambient Temp (°C)
(Indoor/Outdoor) 20/-40 20/-40
Enclosure Airow (m3/h) 580 870
External Airow (m3/h) 1305 1300
Condensate Management Hose discharge / Optional powered C/E Hose discharge / Optional powered C/E
Heating Data (Outdoor Models)
Capacity (W ) 2000 2000
Electrical Data
Rated Voltage (V ) 230 230
Rated Frequency (Hz) 50 50
Voltage Range (V ) 207-253 207-253
Power Consumption L35 L35 (W) 1326 2107
Cooling Amps at Max Conditions (A) 7.9 11.2
Starting Current (A) 26 36
Pre-fuse T (A) 20 20
Performance Factor L35 L35 2.4 2
Sound Level
At 1 M(dBA) 71 71

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WIRE DIAGRAMS
VA14 GENERIC WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY)
WHT7
BLK14
BLK12
AMB.
ENC.
COMPRESSOR
WHT16
BLK15
COMP HTR
BLK20
T-STAT
COOLING
43
6
YEL10
BRN
BLU19 BLK12
YEL10
BLK1
WHT7
WHT16
BLK20 OR BLK12
#1 BRN
GRN/YEL
CAPACITOR
CAPACITOR
BLK
BLK
BLK
#2
#1
IMPELLER
ENCLOSURE
BLK
BLU
BLK
AMBIENT
IMPELLER
BLK
BLU
BRN
GRN/YEL
#2
R
CSYEL3
RED2
POWER BLOCK
BLU
GRN/YEL
WIRE DIAGRAM 90203763 REV C
T-STAT
HEATING
43
6
HEATER
BLK27
BLK28
BRN26
BLU29
BRN26
BLU29
MALF SWITCH
RED(COM) YEL(NO) BLU(NC)
1 3
2
LIMIT
SWITCHES
℃
WHT 18
BLK 17
TRANSFORMER
DOOR SWITCH
RELAY
COM
240V 24V 1
0
8 6
2
4
YEL65
BLK60
WHT61
WHT61
WHT64
L.O.
DIGIT TEMP.DISPLAY
AMBIENT
IMPELLER
BLK
BLU
BRN
GRN/YEL
#3
CAPACITOR
#3
BLK
BLK
L N PE

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SCHEMATICS
CONDENSER IMPELLER
W/OPT.HEAD
PRESS.CTRL
RUN CAP
COOLING TSTAT
HEATING TSATA&
HEATER(OPT)
COMPR
HEATER(OPT)
ENCLOSURE
IMPELLER
RUN CAP
L2
BLU
L1
BRN
M
M
PE
R
CUSTOMER
SWITCH
24V
230V
COMPRESSOR
&
OVERLOAD
RUN CAP
M
CONDENSER IMPELLER
RUN CAP
M
SERVICE DATA
COMPONENTS LIST
Part Description Part Number
VA143025GXXXA VA144025GXXXA
Capacitor, Compressor, Run 90233801 90391743
Capacitor, Condenser Impeller 3218246 3218246
Capacitor, Evaporator Impeller 3218246 3218288
Coil, Condenser 90203731 90203733
Coil, Evaporator 90203734 90203734
Compressor 89107889 90391742
Filter, Air, Reusable 90203767 3218252
Filter/Dryer 3208853 3208853
Head Pressure Control Switch (option) 90206992 90206992
Impeller, Condenser 3206049 3206049
Impeller, Evaporator 33206049 3218286
TXV 90256249 90256249
Thermostat, SPDT, 55-100F 3204580 3204580
Display(option) 90164848 90164848
T-Black 769-603/004/000 90164849 90164849
T-Black 769-103 90164850 90164850

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MAINTENANCE
COMPRESSOR
The compressor requires no maintenance. It is hermetically sealed, properly lubricated at the factory and should
provide years of satisfactory operating service.
INLET AIR FILTER
Proper maintenance of the inlet air lter, located behind the front cover, will assure normal operation of the air
conditioner. If lter maintenance is delayed or ignored, the maximum ambient temperatures under which the unit
is designed to operate will be decreased.
If the compressor’s operating temperature increases above designed conditions due to a dirty or clogged
lter (or plugged condenser coil), the air conditioner’s compressor will stop operating due to actuation of the
thermal overload cut-out switch located on the compressor housing. As soon as the compressor temperature
has dropped to within the switch’s cut-in setting, the compressor will restart automatically. However the above
condition will continue to take place until the lter or coil has been cleaned. It is recommended that power to
the air conditioner be interrupted intentionally when abnormally high compressor operating temperature causes
automatic shut-down of the unit. The above described shut-down is symptomatic of a clogged or dirty lter, thus
causing a reduction in cooling air ow across the surface of the compressor and condenser coil.
Do not run the air conditioner for extended periods of time with the lter removed. Particles of dust, lint, etc., can
plug the ns of the condenser coil which will give the same reaction as a plugged lter. The condenser coil is not
visible through the lter opening, so protect it with a lter.
Continued operation under the above conditions can and will damage and shorten compressor life. The air
conditioner is available with an easily removable inlet lter to facilitate necessary cleaning. There should be no
reason to neglect this necessary maintenance.
HOW TO REMOVE, CLEAN OR INSTALL A NEW INLET AIR FILTER
RP aluminum washable air lters are designed to provide excellent ltering eciency with a high dust holding
capacity and a minimum amount of resistance to air ow. Because they are constructed entirely of aluminum
they are lightweight and easy to service. To achieve maximum performance from your air handling equipment, air
lters should be cleaned on a regular basis.
The inlet air lter is located behind the front cover. To access lter,pull ring protruding from slot in bottom of front
cover. The lter may now be cleaned or new lter installed.
Cleaning Instructions:
1. Flush the lter with warm water from the exhaust side to the intake side. DO NOT USE CAUSTICS.
2. After ushing, allow lter to drain. Placing it with a corner down will assure complete drainage.

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CONDENSER AND EVAPORATOR AIR MOVERS
Impeller motors require no maintenance. All bearings, shafts, etc. are lubricated during manufacturing for the life
of the motor.
If the condenser impeller motor (ambient impeller) should fail, it is not necessary to remove the air conditioner
from the cabinet or enclosure to replace the impeller. The condenser impeller is mounted on its own bulkhead
and is easily accessible by removing the front cover.
Operation of the air conditioner in areas containing airborne
caustics or chemicals can rapidly deteriorate lters, condenser
coils, blowers and motors, etc. Contact Pentair Equipment
Protection for special recommendations.
CAUTION
REFRIGERANT LOSS
Each air conditioner is thoroughly tested prior to leaving the factory to insure against refrigeration leaks. Shipping
damage or microscopic leaks not found with sensitive electronic refrigerant leak detection equipment during
manufacture may require repair or recharging of the system. This work should only be performed by qualied
professionals, generally available through a local, reputable air conditioning repair or service company.
If the unit requires recharging, replace the charging tube with a new one, recommended size of charging copper
tube is 6.35mm O.D. X 100mm L.
Refer to the data on the nameplate which species the type of refrigerant and the charge size in ounces.
Before recharging, make sure there are no leaks and that the system has been properly evacuated into a deep
vacuum.

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TROUBLE SHOOTING
BASIC AIR CONDITIONING TROUBLE SHOOTING CHECK LIST
1. Check manufacturer’s nameplate located on the unit for correct power supply.
2. Turn on power to the unit. The evaporator (Enclosure or “COLD” air) fan should come on. Is there
airow?
YES, proceed to step 3.
NO, possible problem:
• Open motor winding
• Stuck impeller motor
• Obstructed wheel
Repair or Replace
defective part
3. Check thermostat setting and adjust thermostat to the lowest setting. This should turn the
condenser fan and the compressor on. Did condenser fan and compressor come on when the
thermostat was turned on?
YES, proceed to step 4.
NO, possible problem:
• Defective thermostat Replace Part
4. Are all impellers and the compressor running? If not the unit will not cool properly.
5. Check condenser (Ambient or “HOT” air) impellers for airow. Is there airow?
YES, proceed to step 6.
NO, possible problem:
• Defective thermostat
• Open motor winding
• Stuck impeller motor
• Obstructed wheel
Repair or Replace
defective part
6. Carefully check the compressor for operation - motor should cause slight vibration, and the outer
case of the compressor should be warm. Is the compressor showing signs of this?
YES, wait 5 minutes, then proceed to step 7.
NO, possible problem:
• Defective thermostat
• Open motor winding
• Stuck impeller motor
• Obstructed wheel
Repair or Replace
defective part
7. Make sure the coils are clean. Then check evaporator “air in” and “air out” temperatures. If the
temperatures are the same:
• Possible loss of refrigerant
• Possible bad valves in the
compressor
Repair or Replace
defective part
8. To check for a bad thermostat, turn power to the unit off. Remove the upper access panel and
place both thermostat wires onto one terminal (replace upper access panel for safety). This will
activate the switch in the thermostat. Turn the power on and if all impellers and the compressor
come on,the thermostat needs to be replaced.

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SYMPTOMS AND POSSIBLE CAUSES:
SYMPTOM POSSIBLE CAUSE
Unit won’t cool
Clogged ns on coil(s)
Dirty lter
Impellers not running
Compressor not running
Compressor runs, but has bad valves
Loss of refrigerant
Compressor tries to start but won’t run
Low line voltage at start. Should be +/-10% rated voltage.
Compressor motor stuck
Bad contactor
Bad overload switch
Unit blows breakers Undersized breaker/fuse or not time delayed
Short in system
Getting water in enclosure
Drain plugged
Drain tube kinked
Enclosure not sealed (allowing humidity in)
Mounting gasket damaged
For additional technical support, contact nVent Electrical Products China at 400-820-1133.

© 2022 nVent Electrical Products China 89220028
Rev. B P/N 90452821