nvent SPECTRACOOL G521216G Series User manual

© 2019 nVent 89063270
Rev. I P/N 89062700
SPECTRACOOL™
Air Conditioner
G52 neMA 4X WAshdoWn Model
INSTRUCTION MANUAL

© 2019 nVent 89063270
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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
DIMENSIONAL DRAWING ............................................................................................................................................................... 4
HOW TO READ MODEL NUMBERS................................................................................................................................................. 4
INSTALLATION INSTRUCTIONS..................................................................................................................................................... 5
TECHNICAL INFORMATION............................................................................................................................................................ 6
Sequence of Operation................................................................................................................................................................................... 6
Heating .................................................................................................................................................................................................... 6
Cooling..................................................................................................................................................................................................... 6
Standard and Optional Component Operation............................................................................................................................................. 6
Thermostat.............................................................................................................................................................................................. 6
Head Pressure Control........................................................................................................................................................................... 6
Contactor (115V 12000 BTU/Hr. Units only)........................................................................................................................................ 6
Contactor (460V Units only) .................................................................................................................................................................. 7
Overload (460V Units only) .................................................................................................................................................................... 7
Phase Monitor......................................................................................................................................................................................... 7
460V to 230V Transformer .................................................................................................................................................................... 7
115V to 10V or 230V to 10V Transformer (optional) .......................................................................................................................... 7
115V to 24V or 230V to 24V Transformer and Relay (optional)......................................................................................................... 7
Refrigerant Properties Chart (R134a) ........................................................................................................................................................... 7
12000 BTU/Hr. Unit Characteristics.............................................................................................................................................................. 8
Functional Data............................................................................................................................................................................................... 8
Wire Diagrams and Schematics.................................................................................................................................................................... 9
G521216GXXX Generic Schematic (actual unit options may vary) ................................................................................................... 9
G52 All Other Generic 1-Phase Schematic (actual unit options may vary) ..................................................................................... 10
G52 Generic 3-Phase Schematic (actual unit options may vary)..................................................................................................... 11
G521216GXXX Generic Wire Diagram (actual unit options may vary) ............................................................................................ 12
G52 All Other Generic 1-Phase Wire Diagram (actual unit options may vary) ................................................................................ 13
G52 Generic 3-Phase Wire Diagram (actual unit options may vary) ............................................................................................... 14
SERVICE DATA ............................................................................................................................................................................... 15
Components List .......................................................................................................................................................................................... 15
MAINTENANCE..............................................................................................................................................................................16
Compressor................................................................................................................................................................................................... 16
Inlet Air Filter ................................................................................................................................................................................................. 16
How To Remove, Clean or Install a New Inlet Air Filter ............................................................................................................................. 16
Condenser and Evaporator Air Movers....................................................................................................................................................... 17
Refrigerant Loss............................................................................................................................................................................................ 17
F-GAS INFORMATION....................................................................................................................................................................17
TROUBLE SHOOTING ....................................................................................................................................................................18
Basic Air Conditioning Trouble Shooting Check List - Thermostat Version............................................................................................ 18
Symptoms and Possible Causes: ............................................................................................................................................................... 19

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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 Equipment Protection -- within
15 days of delivery. Save the carton and packing material and request an inspection. Then le a claim with the
delivering carrier.
nVent Equipment Protection 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 wire the unit to a properly grounded
power supply using copper conductors only. Power supply wiring should be restrained after eld installation to
ensure no contact with internal fan. Minimum circuit ampacity should be at least 125% of the amperage shown
on the unit nameplate. 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. 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 impellers start.
See Sequence of Operation on page 6 for specics on how the unit operates when powered up.

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DIMENSIONAL DRAWING
HOW TO READ MODEL NUMBERS
G52 12 2 6 G053
12345
1. Identies the type/family of air conditioner and the approximate height (i.e. G52 = Global family
about 52 inch high).
2. This is the air conditioner’s listed capacity in BTU/Hr. at rated conditions. (i.e. 12 = 12,000 BTU/Hr.
at 131/131 F)
3. 1 = 115 Volt, 2 = 230 Volt, 4 = 460 Volt.
4. 6 = 50/60 Hz or 60 Hz only.
5. Unique set of numbers for each air conditioner which identies the accessories on a model.
89062066

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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, see
Figure 1.
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. To avoid cross-threading mounting inserts, start bolts by hand before tightening with a wrench or
ratchet driver.
5. Allow unit to remain upright for a minimum of ve (5) minutes before starting. CAUTION! Air
conditioner must be in upright position during operation.
6. Refer to the nameplate for electrical requirements. Wire the unit to a properly grounded power
supply. For 3 phase units, once power is applied, verify that phase monitor light is illuminated
which indicates correct electrical phasing. Electrical circuit should be fused with slow blow or
HACR circuit breaker.
7. Some air conditioners require a remote mounted thermostat. Wire the thermostat outputs to the
appropriate terminals on the 24 VAC terminal strip by noting the locations on the correct wiring
diagram.
8. Set thermostat for required cabinet temperature. Refer to Sequence of Operation on page 6 for
thermostat adjustment and operation.
Figure 1
Cut-out Drawing

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TECHNICAL INFORMATION
SEQUENCE OF OPERATION
The air conditioner comes standard with two internally mounted thermostats. There are two modes of operation;
heating and cooling. During heating and cooling modes, the evaporator fan will be running.
HEATING
When the enclosure temperature is below the heating thermostat setpoint, power is applied to the
heaters. When the enclosure temperature is 10 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 or through a contactor if unit requires one.
The condenser impellers 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
impellers 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 70 F. 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 G52 air conditioner uses our standard 10-1061-16 thermostat. The thermostat setpoint equals the
temperature that the air conditioner turns off. The thermostat has a 10 F differential from setpoint until it
calls for cooling or heating. An example of operation is shown below.
FOR COOLING (75-100 F RANGE):
• Thermostat setpoint = 80 F
• Cooling turns on at 90 F
• Cooling turns off at 80 F
FOR HEATING (55-65 F RANGE):
• Thermostat setpoint = 55 F
• Heating turns on at 55 F
• Heating turns off at 65 F
NOTE: For testing purposes only, the thermostat stop screw may be removed (on units so
equipped) to allow settings below 70 F. After testing, replace the stop screw and verify that the
thermostat cannot be set below 70 F. Extended operation below 70 F can cause coil freeze ups
resulting in reduced load and/or unit damage.
HEAD PRESSURE CONTROL
Unit is set at the factory, no adjustment necessary.
At a saturated condenser temperature of 85 F (95 psig), the condenser fans will power off. At a saturated
condenser temperature of 118 F (165 psig), the condenser fans will power on.
CONTACTOR (115V 12000 BTU/HR. UNITS ONLY)
The contactor on this model uses a 115V coil.

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CONTACTOR (460V UNITS ONLY)
The contactor on this model uses a 230V coil.
OVERLOAD (460V UNITS ONLY)
Set overload reset setting to automatic “A” and trip point dial to 3.0A.
PHASE MONITOR
This product is equipped with Phase/Voltage Protection. Please verify correct phasing and voltage before
operating. Note the fans may still operate if phasing is incorrect, but the compressor will not, so the unit
will not cool. Illuminated light on Phase Monitor indicates phase is correct.
If the light is not illuminated, disconnect power from the unit and swap any two power leads at the
terminal block. This should correct the phasing. The light should now illuminate when power is reapplied.
460V TO 230V TRANSFORMER
The 230V from this transformer powers the fans, contactor and optional transformers. 460V is only used
to run the compressor.
115V TO 10V OR 230V TO 10V TRANSFORMER (OPTIONAL)
This transformer powers the thermal display only.
115V TO 24V OR 230V TO 24V TRANSFORMER AND RELAY (OPTIONAL)
This transformer and relay are used to start/stop the unit thru a customer supplied, remote mounted door
switch.
REFRIGERANT PROPERTIES CHART (R134A)
°F °C Pressure °F °C Pressure
-40 -40 -14.7 60 15.6 58
-35 -37.2 -12.3 65 18.3 64
-30 -34.4 -9.7 70 21.1 71.5
-25 -31.7 -6.8 75 23.9 78
-20 -28.9 -4 80 26.7 86.7
-15 -26.1 085 29.4 95
-10 -23.3 290 32.2 105
-5 -20.6 495 35 113.3
0-17.8 7.5 100 37.8 125
5-15 9105 40.6 135
10 -12.2 12 110 43.3 146.7
15 -9.4 15 115 46.1 157.5
20 -6.7 18.5 120 48.9 170
25 -3.9 22 125 51.7 185
30 -1.1 26 130 54.4 197.5
35 1.7 30 135 57.2 213.3
40 4.4 35 140 60 230
45 7.2 40 145 62.8 246.7
50 10 45.5 150 65.6 263.8
55 12.8 51.5

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12000 BTU/HR. UNIT CHARACTERISTICS
Model
G521216GXXX G521226GXXX G521246GXXX
Dimensional Data
Height 53.63” / 1362mm
Width 17.12” / 435 mm
Depth 13.42” / 341mm
Unit Weight 135 lbs / 61 kg
Unit Protection Rating Type 12/4/4X/3R
Cooling Data
Refrigerant R134A
Refrigerant Charge 38 oz.
Cooling Capacity at 95 F Enclosure
95 F Ambient (BTU/Hr./W) 7900/8300 6900/7500
Cooling Capacity at Max Conditions
(BTU/Hr./W) 9700/10000 9000/9400
Maximum Ambient Temp 131 F / 55 C
Minimum Ambient Temp -40 F / -40 C
Enclosure Airow 294/310 CFM
External Airow 391/404 CFM
Condensate Management Hose discharge / Optional powered C/E
Heating Data
Capacity 2000W
Electrical Data
Rated Voltage (50/60 Hz) 115V 230/208-230V 400/460V
Rated Frequency 50 / 60 Hz
Voltage Range +/- 10% of rated
Cooling Amps at Max Conditions 16.1 / 21.0 9.1 / 10.6 - 9.5 3.7
Heating Amps 17.3 9.6 5.0
Compressor RLA / LRA 9.8 / 57.0 4.9 / 38.0 2.9 / 16.0
Evaporator Fan RLA* .5 .3 .3
Condenser Fan RLA* .5 .3 .3
FUNCTIONAL DATA
Unit Evaporator. Air
In(°F) Amps(A) Condenser Delta(°F) Evaporator Delta(°F)
G521216G05X 65-80 9.2-12.0 24-34 22-32
80-100 11.0-15.8 28-38 24-34
G521226G05X 65-80 4.5-6.2 18-27 23-33
80-100 5.2-7.4 21-32 27-31
G521246G05X 65-80 2.3-3.4 21-32 22-32
80-100 2.4-3.7 26-40 26-35

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WIRE DIAGRAMS AND SCHEMATICS
G521216GXXX GENERIC SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY)

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G52 ALL OTHER GENERIC 1-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY)

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G52 GENERIC 3-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY)

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G521216GXXX GENERIC WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY)
89081449

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G52 ALL OTHER GENERIC 1-PHASE WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY
VARY)
89081442

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G52 GENERIC 3-PHASE WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY)

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SERVICE DATA
COMPONENTS LIST
Part Description Part Number
G521216GXXX G521226GXXX G521246G05X
Capacitor, Compressor, Start 10-1032-32 10-1032-08 NA
Capacitor, Compressor, Run 52-6032-06 52-6032-01 NA
Capacitor, Impellers (3) 52-6032-13 52-6032-14 52-6032-14
Coil, Condenser 52-6010-10 52-6010-10 52-6010-10
Coil, Evaporator 52-6010-11 52-6010-11 52-6010-11
Compressor 10-1016-88 10-1026-107 10-1026-113
Contactor, Compressor 10-1005-41 NA 89098321
Filter, Air, Reusable 89046270 89046270 89046270
Filter/Dryer 52-6028-06 52-6028-06 52-6028-06
Head Pressure Control Switch (option) 52-6104-26 52-6104-26 52-6104-26
Impeller, Condenser (2) 10-1091-123 10-1091-124 10-1091-124
Impeller, Evaporator 10-1091-123 10-1091-124 10-1091-124
Relay, Compressor Start 10-1042-17 10-1042-17 NA
Thermal Expansion Valve 10-1040-31 10-1040-31 10-1040-31
Thermal Overload, Compressor NA 10-1007-70 10-1007-79
Thermostat, SPDT, 55-100F 10-1061-16 10-1061-16 10-1061-16
Transformer, 460V NA NA 10-1006-149
Overload, Compressor NA NA 89098326
Relay, Phase Monitor NA NA 89097986

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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.
Under no circumstances should the access tting covers be loosened, removed or tampered with.
Breaking of seals on compressor access ttings during warranty period will void warranty on hermetic system.
Recharging ports are provided for the ease and convenience of reputable refrigeration repair service personnel for
recharging the air conditioner.
INLET AIR FILTER
Proper maintenance of the inlet air lter, located inside the ambient inlet shroud, 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 shutdown 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 inside the ambient inlet shroud. To access the lter, reach in the front lip of the
ambient inlet shroud. Gently push the lter up and over the “V” groove in the shroud and then allow the lter to
drop out of the shroud. 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 one of the condenser impeller motors (ambient impellers) should fail, it is not necessary to remove the air
conditioner from the cabinet or enclosure to replace the blower. The condenser blower 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 nVent 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.
Should the refrigerant charge be lost, access ports on the suction and discharge sides of the compressor are
provided for recharging and/or checking suction and discharge pressures.
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.
F-GAS INFORMATION
G521216GXXX
Refrigerant
Kühlmittel
Chłodziwo R134a
GWP 1430
Factory Charge
Füllmenge durch Hersteller
Opłata Fabryczna
1077 Grams
1077 Gramm
1077 Gramów
CO2Equivalent
CO2Equivalent
CO2Ekwilalent
1.54 Tons
1,54 Tonnen
1,54 Tony

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TROUBLE SHOOTING
BASIC AIR CONDITIONING TROUBLE SHOOTING CHECK LIST - THERMOSTAT
VERSION
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) impeller 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 phase monitor indicator light, is it Illuminated?
YES, proceed to step 4.
NO, possible problem:
» Incorrect electrical phasing
De-energize unit and swap
any two power leads
to unit. If problem still
persists, replace phase
monitor. Refer to phase
monitor section of this
manual for additional
information.
4. Check thermostat setting and adjust thermostat to the lowest setting. This should turn the
condenser impellers and the compressor on. Did condenser impellers and compressor come on
when the thermostat was turned on?
YES, proceed to step 5.
NO, possible problem:
» Tripped customer door switch
» Defective thermostat Replace part
5. Are all impellers and the compressor running? If not the unit will not cool properly.
6. Check condenser (Ambient or “HOT” air) impellers for airow. Is there airow?
YES, proceed to step 7.
NO, possible problem:
» Defective thermostat
» Open motor winding
» Stuck impeller motor
» Obstructed wheel
Repair or Replace
defective part
7. 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 8.
NO, possible problem:
» Defective thermostat
» Defective overload
» Defective relay
Repair or Replace
defective part

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8. 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
9. 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.
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
Bad run/start capacitor
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 Equipment Protection at 800-896-2665.

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NOTES