McLean SPECTRACOOL G57 User manual
© 2012 Pentair Technical Products 89055585
Rev. F P/N 10-1008-243
Protecting Electronics.
Exceeding Expectations.™
Pentair Technical Products
2100 Homan Way
Anoka, MN 55303
+1-763-323-8200
+1-763-576-3200
www.McLeanCoolingTech.com
INSTRUCTION MANUAL
SPECTRACOOL™
Air Conditioner
G57
© 2012 Pentair Technical Products 89055585
- 2 -
TABLE OF CONTENTS
RECEIVING THE AIR CONDITIONER .............................................................................................................................................................. 3
HANDLING AND TESTING THE AIR CONDITIONER ................................................................................................................................. 3
DIMENSIONAL DRAWINGS ............................................................................................................................................................................. 4
20000 BTU/Hr. (G572026GXXX, G572026G2XX) ............................................................................................................................. 4
20000 BTU/Hr. (G572046G15X) ............................................................................................................................................................ 4
HOW TO READ MODEL NUMBERS ............................................................................................................................................................... 5
INSTALLATION INSTRUCTIONS ..................................................................................................................................................................... 5
TECHNICAL INFORMATION ............................................................................................................................................................................ 7
Sequence of Operation ........................................................................................................................................................................... 7
Heating .................................................................................................................................................................................................. 7
Cooling .................................................................................................................................................................................................. 7
Standard and Optional Component Operation ............................................................................................................................. 7
Thermostat ........................................................................................................................................................................................... 7
Head Pressure Control ..................................................................................................................................................................... 7
Contactor .............................................................................................................................................................................................. 8
Freezestat ............................................................................................................................................................................................. 8
Time Delay Relay ................................................................................................................................................................................ 8
200 V to 230 V Transformer (G572026G2XX only) .................................................................................................................. 8
Phase Monitor (G572046GXXX only) .......................................................................................................................................... 8
460 V to 230 V Transformer (G572046GXXX only) .................................................................................................................. 8
230 V to 10 V Transformer (optional) .......................................................................................................................................... 8
230 V to 24 V Transformer and Relay (optional) ...................................................................................................................... 8
Refrigerant Properties Chart (R407c).................................................................................................................................................. 9
Unit Characteristics .................................................................................................................................................................................10
Functional Data ........................................................................................................................................................................................10
Wire Diagrams and Schematics ..........................................................................................................................................................11
G57 208V 1-Phase Generic Wire Diagram (actual unit options may vary) ..................................................................11
G57 208V 1-Phase Generic Schematic (actual unit options may vary) ........................................................................12
G57 230V 1-Phase Generic Wire Diagram (actual unit options may vary) ..................................................................13
G57 230V 1-Phase Generic Schematic (actual unit options may vary) ........................................................................14
G57 400/460V 3-Phase 50/60hz Generic Wire Diagram (actual unit options may vary) ........................................15
G57 400/460V 3-Phase 50/60hz Generic Schematic (actual unit options may vary) ..............................................16
SERVICE DATA ...................................................................................................................................................................................................17
Components List ......................................................................................................................................................................................17
MAINTENANCE .................................................................................................................................................................................................18
Compressor ...............................................................................................................................................................................................18
Inlet Air Filter .............................................................................................................................................................................................18
How To Remove, Clean or Install a New Inlet Air Filter ..............................................................................................................18
Condenser and Evaporator Air Movers ............................................................................................................................................19
Refrigerant Loss........................................................................................................................................................................................19
TROUBLE SHOOTING ......................................................................................................................................................................................20
Basic Air Conditioning Trouble Shooting Check List ..................................................................................................................20
Symptoms and Possible Causes: ........................................................................................................................................................21
WARRANTY ........................................................................................................................................................................................................22
RETURN AND REPAIR POLICY ......................................................................................................................................................................22
LIMITATION OF LIABILITY ..............................................................................................................................................................................23
© 2012 Pentair Technical Products89055585 - 3 -
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 McLean Cooling Technology -- within 15
days of delivery. Save the carton and packing material and request an inspection. Then le a claim with the delivering
carrier.
Pentair Technical Products 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. 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 7 for specics on how the unit operates when powered up.
© 2012 Pentair Technical Products 89055585
- 4 -
DIMENSIONAL DRAWINGS
20000 BTU/Hr. (G572026GXXX, G572026G2XX)
$&&(66+2/(72
>@2''5$,1678%
&/($1$%/(5(86$%/(
$/80,180,1/(7),/7(5
%(+,1'5(029$%/(3$1(/
(1&/2685(
$,5,1
$0%,(17
$,5,1
:$50
$,5287
5(029$%/(
+$1*,1*
7$%6
&22/
$,5287
127(
$33529(727<3(5;
02817,1**$6.(76833/,('1276+2:1
$&&(663$1(/)25
237,21$/+($7(5
81&
02817,1*+2/(6
32:(5,1/(7
&22/,1*
7+(50267$7
+($7
7+(50267$7
237,21$/
88040022
20000 BTU/Hr. (G572046G15X)
$&&(663$1(/
)25+($7(5
81&
02817,1*+2/(6
32:(5,1/(7
&22/,1*
7+(50267$7
+($7
7+(50267$7
$&&(66+2/(72
2''5$,1678%
&/($1$%/(5(86$%/(
$/80,180,1/(7),/7(5
%(+,1'5(029$%/(3$1(/
127(
$33529(727<3(5
02817,1**$6.(76833/,('1276+2:1
(1&/2685(
$,5,1
$0%,(17
$,5,1
:$50
$,5287
5(029$%/(
+$1*,1*
7$%6
&22/
$,5287
89059779
WARM
AIR OUT
AMBIENT
AIR IN
ACCESS HOLE TO .375 [9.5]
OUTSIDE DIAMETER DRAIN STUB
NOTE:
1. APPROVE TO TYPE 3R, 4, 4X 12
2. MOUNTING GASKET SUPPLIED (NOT SHOWN)
ACCESS PANEL FOR
OPTIONAL HEATER
1/4 - 20 MOUNTING
HOLES (16)
ENCLOSURE
AIR IN
POWER INLET
COOL
THERMOSTAT
COOL AIR
OUT
REMOVABLE
HANGING TABS
HEAT
THERMOSTAT
(OPTIONAL)
CLEANABLE, REUSABLE,
ALUMINUM INLET FILTER
BEHIND REMOVABLE PANEL
WARM
AIR OUT
AMBIENT
AIR IN
ACCESS HOLE TO .375 [9.5]
OUTSIDE DIAMETER DRAIN STUB
NOTE:
1. APPROVE TO TYPE 3R, 4, 12
2. MOUNTING GASKET SUPPLIED (NOT SHOWN)
ACCESS PANEL FOR
OPTIONAL HEATER
1/4 - 20 MOUNTING
HOLES (16)
ENCLOSURE
AIR IN
POWER INLET
COOL
THERMOSTAT
COOL AIR
OUT
REMOVABLE
HANGING
TABS
HEAT
THERMOSTAT
(OPTIONAL)
CLEANABLE, REUSABLE,
ALUMINUM INLET FILTER
BEHIND REMOVABLE PANEL
© 2012 Pentair Technical Products89055585 - 5 -
HOW TO READ MODEL NUMBERS
G57 20 2 6 G150
12345
1. Identies the type/family of air conditioner and the approximate height (i.e. G57 = Global family about
57 inch high).
2. This is the air conditioner’s listed capacity in BTU/Hr. at rated conditions. (i.e. 20 = 20,000 BTU/Hr. at
131/131 F)
3. 2 = 208 or 230 Volt, 4 = 460 Volt.
4. 6 = 50/60 Hz or 60 Hz only.
5. Unique set of numbers for each air conditioner which identies the accessories on a model. All –G2XX
models are 208 Volt 60 Hz.
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.
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. 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.
7. Set thermostat for required cabinet temperature. Refer to Sequence of Operation on page 7 for
thermostat adjustment and operation.
© 2012 Pentair Technical Products 89055585
- 6 -
88028328 89061034
SURFACE MOUNT SURFACE MOUNT (3-PHASE VOLTAGE)
89045267
PARTIAL RECESS MOUNT
Figure 1
Cutout Dimensions
© 2012 Pentair Technical Products89055585 - 7 -
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 o.
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 specic 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 G57 air conditioner uses our standard 10-1061-16 thermostat. The thermostat setpoint equals the
temperature that the air conditioner turns o. The thermostat has a 10 F dierential 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 o at 80 F
For heating (55-65 F range):
• Thermostat setpoint = 55 F
• Heating turns on at 55 F
• Heating turns o 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 can not 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 pressure of 170 psig, the condenser fans will power o. At a saturated condenser
pressure of 240psig, the condenser fans will power on.
© 2012 Pentair Technical Products 89055585
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Contactor
The contactor on this model uses a 230 V coil.
Freezestat
The freezestat shuts down the compressor during a frozen evaporator coil condition. The freezestat will
automatically reset when the frozen coil has thawed suciently.
Time Delay Relay
The time delay relay keeps the unit from short cycling after the freezestat resets following a frozen evaporator
coil condition.
200 V to 230 V Transformer (G572026G2XX only)
The 230 V from this transformer powers the compressor, fans, contactor and optional transformers.
Phase Monitor (G572046GXXX only)
The phase monitor protects the compressor from reverse operation. When both lights on the monitor are lit
constant, the power to the unit has been wired correctly and the compressor will operate as designed.
If both lights on the monitor are not lit constant, swap the power leads at the terminal block until both lights
are lit constant.
Factory Settings:
Top dial set at 480 V for 60 Hz operation (Reset to 440 V for 50 Hz operation)
Middle dial set at 5 seconds
Bottom dial set at -20%
460 V to 230 V Transformer (G572046GXXX only)
The 230 V from this transformer powers the fans, contactor and optional transformers. 460 V is only used to
run the compressor.
230 V to 10 V Transformer (optional)
This transformer powers the thermal display only.
230 V to 24 V Transformer and Relay (optional)
This transformer and relay are used to start/stop the unit by using a customer supplied, remote mounted door
switch.
© 2012 Pentair Technical Products89055585 - 9 -
Refrigerant Properties Chart (R407c)
°F °C Bubble Pt Dew Point °F °C Bubble Pt Dew Point
-40 -40 2.9 4.5 60 15.6 117.7 96.8
-35 -37.2 5.2 0.7 65 18.3 128.7 106.7
-30 -34.4 7.9 1.7 70 21.1 140.2 117.2
-25 -31.7 10.7 4 75 23.9 152.5 128.4
-20 -28.9 13.9 6.5 80 26.7 165.5 140.4
-15 -26.1 17.3 9.3 85 29.4 179.2 153.1
-10 -23.3 21.1 12.4 90 32.2 193.6 166.5
-5 -20.6 25.2 15.8 95 35 208.8 180.8
0 -17.8 29.6 19.5 100 37.8 224.9 195.8
5 -15 34.4 23.6 105 40.6 241.8 211.8
10 -12.2 39.6 28 110 43.3 259.6 228.7
15 -9.4 45.2 32.7 115 46.1 278.2 246.5
20 -6.7 51.3 37.9 120 48.9 297.8 265.3
25 -3.9 57.8 43.6 125 51.7 318.3 285.2
30 -1.1 64.7 49.6 130 54.4 339.9 306.1
35 1.7 72.2 56.2 135 57.2 362.4 328.2
40 4.4 80.2 63.2 140 60 386 351.4
45 7.2 88.7 70.7 145 62.8 410.7 375.9
50 10 97.8 78.8 150 65.6 436.5 401.7
55 12.8 107.5 87.5
© 2012 Pentair Technical Products 89055585
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Unit Characteristics
Model
G57-2026-G2XX G57-2026-G1XX G57-2046-GXXX
Dimensional Data
Height 57.69” / 1465.4 mm
Width 20.78” / 527.8 mm
Depth 15.28” / 388.1 mm
Unit Weight 219 lbs / 99 kg 197 lbs / 89 kg 207 lbs / 94 kg
Unit Protection Rating Type 12/4/4X/3R
Cooling Data
Refrigerant R407c
Refrigerant Charge 50 oz. 48 oz.
Cooling Capacity at 95 F Enclosure 95
F Ambient (BTU/Hr./W) 18000 16500/18000 17000/18800
Cooling Capacity at Max Conditions
(BTU/Hr./W) 20500 19000/20500 18800/20500
Maximum Ambient Temp 131 F / 55 C
Minimum Ambient Temp -40 F / -40 C
Enclosure Airow 513 / 600 CFM
External Airow 940 / 1070 CFM
Condensate Management Hose discharge / Optional powered C/E
Heating Data
Capacity 3000 W N/A
Electrical Data
Rated Voltage (50/60 Hz) 208 V 230 V 400/460 V 3 phase
Rated Frequency 60 Hz 50 / 60 Hz
Voltage Range +/- 10% of rated
Cooling Amps at Max Conditions 23.5 19.0/22.0 6.0/6.8
Heating Amps 15.0 13.5 NA
Compressor RLA / LRA 13.6/63.0 13.6/63.0 4.3/27.0
Evaporator Fan RLA* 0.8/1.1 0.8/1.1 0.8/1.1
Condenser Fan RLA* 0.8/.86 0.8/.86 0.8/.86
*@230 VAC
Functional Data
Unit Evaporator. Air
In(°F) Amps(A) Condenser
Delta(°F)
Evaporator
Delta(°F)
G572026G1XX 65-80 9.1-12.2 19-32 19-34
80-100 11.1-15.2 26-35 20-34
G572026G2XX 65-80 11.2-14.1 20-32 28-34
80-100 13.1-17.5 26-37 27-34
G572046GXXX 65-80 3.0-4.5 21-32 24-35
80-100 3.5-5.5 26-35 18-30
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