Pentair SPECTRACOOL 43 User manual

© 2013 Pentair Equipment Protection 89074138
Rev. J P/N 89068451
SPECTRACOOL™
Air Conditioner
n43 Model
INSTRUCTION MANUAL

© 2013 Pentair Equipment Protection 89074138
- 2 -
TABLE OF CONTENTS
RECEIVING THE AIR CONDITIONER...............................................................................................................................................................................3
HANDLING AND TESTING THE AIR CONDITIONER ......................................................................................................................................................3
HOW TO READ MODEL NUMBERS.................................................................................................................................................................................3
TECHNICAL INFORMATION ............................................................................................................................................................................................4
Sequence of Operation..........................................................................................................................................................................................................................4
Heating..........................................................................................................................................................................................................................................4
Cooling..........................................................................................................................................................................................................................................4
Standard and Optional Component Operation .....................................................................................................................................................................................4
Thermostat ...................................................................................................................................................................................................................................4
Remote Access Control (optional) ...............................................................................................................................................................................................4
Head Pressure Control ................................................................................................................................................................................................................4
Contactor ......................................................................................................................................................................................................................................4
Phase Monitor (N431246GXXX only) ............................................................................................................................................................................................5
460 V to 230 V Transformer (N431246GXXX only)........................................................................................................................................................................5
115V/230 V to 10 V Transformer (optional)..................................................................................................................................................................................5
115/230 V to 24 V Transformer and Relay (optional)...................................................................................................................................................................5
Schematics and Wiring Diagrams for Thermostat Control .................................................................................................................................................................6
N43 115V 1-Phase Generic Schematic (actual unit options may vary) ......................................................................................................................................6
N43 230V 1-Phase Generic Schematic (actual unit options may vary) ......................................................................................................................................6
N43 460V 3-Phase Generic Schematic (actual unit options may vary) ......................................................................................................................................7
N43 115V 1-Phase Generic Wire Diagram (actual unit options may vary).................................................................................................................................8
N43 230V 1-Phase Generic Wire Diagram (actual unit options may vary).................................................................................................................................9
N43 400/460V 3-Phase Generic Wire Diagram (actual unit options may vary) .......................................................................................................................10
DIMENSIONAL DRAWING.............................................................................................................................................................................................11
With Thermostats................................................................................................................................................................................................................................11
INSTALLATION INSTRUCTIONS....................................................................................................................................................................................12
REMOTE ACCESS CONTROL (optional)........................................................................................................................................................................13
INTRODUCTION ...................................................................................................................................................................................................................................13
ENERGIZING THE CONTROLLER........................................................................................................................................................................................................13
CONTROL STATUS INDICATION..........................................................................................................................................................................................................13
DISPLAYING AND CHANGING PROGRAM VARIABLES ......................................................................................................................................................................14
OPERATING PARAMETERS.................................................................................................................................................................................................................14
ALARM PARAMETERS.........................................................................................................................................................................................................................14
DISPLAYING TEMPERATURE SENSOR #2 .........................................................................................................................................................................................14
COMPRESSOR RESTART TIME DELAY ...............................................................................................................................................................................................14
ALARM OUTPUT CONTACT .................................................................................................................................................................................................................14
ALARM INPUT CONNECTION .............................................................................................................................................................................................................15
ALARM CONDITION DISPLAY..............................................................................................................................................................................................................15
AIR CONDITIONER UNIT COMMUNICATION FEATURES...................................................................................................................................................................15
USB Communication..................................................................................................................................................................................................................15
Ethernet Communication...........................................................................................................................................................................................................15
Software and MIB File Downloads.............................................................................................................................................................................................16
Using the PC Interface Tool .......................................................................................................................................................................................................16
USB COMMUNICATION MODE............................................................................................................................................................................................................16
Viewing Air Conditioner Unit Values..........................................................................................................................................................................................16
Changing Air Conditioner Unit Values.......................................................................................................................................................................................16
Viewing and Changing Ethernet Information............................................................................................................................................................................16
ETHERNET COMMUNICATION MODE ................................................................................................................................................................................................17
Viewing Air Conditioner Unit Values..........................................................................................................................................................................................17
Changing Air Conditioner Unit Values.......................................................................................................................................................................................17
Viewing and Changing Ethernet Information............................................................................................................................................................................17
Alarm Log Accessible with SNMP .............................................................................................................................................................................................17
Remote Access Control Pin-out..........................................................................................................................................................................................................18
Schematic and Wiring Diagram for Remote Access Control.............................................................................................................................................................19
N43 1-Phase Generic Schematic (actual unit options may vary).............................................................................................................................................19
N43 460V 3-Phase Generic Schematic for Remote Access Control (actual unit options may vary).......................................................................................20
N43 1-Phase Generic Wire Diagram for Remote Access Control (actual unit options may vary) ..........................................................................................21
N43 460V 3-Phase Generic Wire Diagram for Remote Access Control (actual unit options may vary) .................................................................................22
DIMENSIONAL DRAWINGS...........................................................................................................................................................................................23
N43 Generic Model Drawing With Remote Access Control...............................................................................................................................................................23
INSTALLATION INSTRUCTIONS WITH REMOTE ACCESS CONTROL..........................................................................................................................24
MAINTENANCE .............................................................................................................................................................................................................25
Compressor .........................................................................................................................................................................................................................................25
Inlet Air Filter.......................................................................................................................................................................................................................................25
How To Remove, Clean or Install a New Inlet Air Filter.....................................................................................................................................................................25
Condenser and Evaporator Air Movers ..............................................................................................................................................................................................26
Refrigerant Loss..................................................................................................................................................................................................................................26
Refrigerant Properties Chart (R 134a)................................................................................................................................................................................................27
Functional Data....................................................................................................................................................................................................................................27
Unit Characteristics.............................................................................................................................................................................................................................28
SERVICE DATA ...............................................................................................................................................................................................................29
Components List .................................................................................................................................................................................................................................29
N43-1216-GXXX Pressure Tables........................................................................................................................................................................................................30
N43-1226-GXXX Pressure Tables........................................................................................................................................................................................................31
N43-1246-GXXX Pressure Tables........................................................................................................................................................................................................32
TROUBLE SHOOTING....................................................................................................................................................................................................34
Basic Air Conditioning Trouble Shooting Check List - Thermostat Version .....................................................................................................................................34
Symptoms and Possible Causes - Thermostat Version.....................................................................................................................................................................35
Basic Air Conditioning Trouble Shooting Check List - Remote Access Control Version..................................................................................................................36
Symptoms and Possible Causes - Remote Access Control Version .................................................................................................................................................37
WARRANTY....................................................................................................................................................................................................................38
RETURN AND REPAIR POLICY .....................................................................................................................................................................................38
LIMITATION OF LIABILITY .............................................................................................................................................................................................39

© 2013 Pentair Equipment Protection
89074138 - 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 Pentair Equipment Protection --
within 15 days of delivery. Save the carton and packing material and request an inspection. Then file a claim with
the delivering carrier.
Pentair 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 five (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 filled
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 field 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 five (5) to ten (10) minutes. You will need to set the cooling
thermostat or controller setpoint 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 4 for specifics on how the unit operates when powered up.
HOW TO READ MODEL NUMBERS
N43 12 2 6 G150
12345
1. Identifies the type/family of air conditioner and the approximate height (i.e. N43 = Global family
about 43 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 identifies the accessories on a model.

© 2013 Pentair Equipment Protection 89074138
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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 specific
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 flows 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.
REMOTE ACCESS CONTROL (OPTIONAL)
See REMOTE ACCESS CONTROL (optional) on page 13
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
The contactor on the 1 phase 115V model uses a 115 V coil. The 3 phase model uses a 230 V coil.
The contactor on the 1-phase 230V model uses a 230V coil (controller option only).

© 2013 Pentair Equipment Protection
89074138 - 5 -
PHASE MONITOR (N431246GXXX 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 on constant, swap the power leads at the terminal block until both
lights are on 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 (N431246GXXX ONLY)
The 230 V from this transformer powers the fans, contactor and optional transformers. 460 V is only used
to run the compressor.
115V/230 V TO 10 V TRANSFORMER (OPTIONAL)
This transformer powers the temperature display only.
115/230 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.

© 2013 Pentair Equipment Protection 89074138
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SCHEMATICS AND WIRING DIAGRAMS FOR THERMOSTAT CONTROL
N43 115V 1PHASE GENERIC SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY)
05-2001-193
N43 230V 1PHASE GENERIC SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY)
05-2001-192

© 2013 Pentair Equipment Protection
89074138 - 7 -
N43 460V 3PHASE GENERIC SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY)
89069911

© 2013 Pentair Equipment Protection 89074138
- 8 -
N43 115V 1PHASE GENERIC WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY)
HEATER
BLK14
BLK12
AMB.
ENC.
COMPRESSOR
HPC
BLK
BLK
BLK1
OR C/E
(OPTIONAL)
BLK20
T-STAT
COOLING
RED13
ENCLOSURE
BRN
BLU
BLK
GRN/YEL
IMPELLER BLK
BLK
BLK
BLK
BLK
BLK
BRN
GRN/YEL
IMPELLER
AMBIENT BLU
BLK
IMPELLER
GRN/YEL
BRN
BLK
BLU
BLU19
AMBIENT
BLK12
YEL10
BLK11
RELAY
START
START
RED R
RUN
CAP.
ORG6
RED5 CAP.
25
1
YEL4
WHT7
RED13
BLU9
BRN8
BLK20
BLK23
WHT7
WHT25
BLK24
HEATING
T-STAT
RED30
BRN26
13
MALF
SWITCH
(OPTIONAL)
2
YEL(NO) RED(COM) BLU(NC)
BLU29
#1
#2
#3
COMP HTR
(OPTIONAL)
(OPTIONAL)
SUPPRESSOR
THERMAL DISPLAY (OPT.)
TO THERMAL
115(230) V
10 V
DISPLAY
WHT41
BLK40
DOOR SWITCH (OPT.)
RED62
T'FORMER
BLK60
WHT61
YEL65
RELAY
0
1
4
8
2
6
YEL10
YEL10 OR
YEL65
WHT61
R
CSYEL S
RED R
BLK60
WHT63 WHT64
WHT25
BLK27
BLK28
SWITCHES
LIMIT
BLK11
1
4
5
6
3
2
GRN/YEL21
POWER
BLOCK
BLK12
43
6
43
6
CUSTOMER
SWITCH
TO
89069906

© 2013 Pentair Equipment Protection
89074138 - 9 -
N43 230V 1PHASE GENERIC WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY)
HEATER
BLK14
BLK12
AMB.
ENC.
COMPRESSOR
HPC
WHT
WHT
BLK1
OR C/E
(OPTIONAL)
BLK20
T-STAT
COOLING
RED13
ENCLOSURE
BRN
BLU
BLK
GRN/YEL
IMPELLER BLK
BLK
BLK
BLK
BLK
BLK
BRN
GRN/YEL
IMPELLER
AMBIENT BLU
BLK
IMPELLER
GRN/YEL
BRN
BLK
BLU
BLU19
AMBIENT
BLK12
YEL10
BLK11
RELAY
START
START
RED R
RUN
CAP.
ORG6
RED5 CAP.
25
1
YEL4
WHT7
RED13
BLU9
BRN8
BLK20
WHT7
BLK11
HEATING
T-STAT
RED30
BRN26
13
MALF
SWITCH
(OPTIONAL)
2
YEL(NO) RED(COM) BLU(NC)
BLU29
#1
#2
#3
COMP HTR
(OPTIONAL)
(OPTIONAL)
SUPPRESSOR
THERMAL DISPLAY (OPT.)
TO THERMAL
115(230) V
10 V
DISPLAY
WHT41
BLK40
DOOR SWITCH (OPT.)
RED62
T'FORMER
BLK60
WHT61
YEL65
RELAY
0
1
4
8
2
6
YEL10
YEL10 OR
YEL65
WHT61
R
CSYEL S
RED R
WHT63 WHT64
BLK27
BLK28
SWITCHES
LIMIT
1
4
5
6
3
2
GRN/YEL21
POWER
BLOCK
BLK12
43
6
43
6
CUSTOMER
SWITCH
TO
89073638

© 2013 Pentair Equipment Protection 89074138
- 10 -
N43 400/460V 3PHASE GENERIC WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY)

© 2013 Pentair Equipment Protection
89074138 - 11 -
DIMENSIONAL DRAWING
WITH THERMOSTATS
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89068457

© 2013 Pentair Equipment Protection 89074138
- 12 -
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. Allow unit to remain upright for a minimum of five (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 9 for
thermostat adjustment and operation.
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Figure 1
Cutout Dimensions

© 2013 Pentair Equipment Protection
89074138 - 13 -
REMOTE ACCESS CONTROL (OPTIONAL)
INTRODUCTION
The Remote Access Control is a parametric controller for the complete management of air conditioners. All
settings are pre-programmed at the factory. Cooling/heating set-points, cooling/heating differential and high /low
temperature alarm set-points can be adjusted by the user. Alarms are outputted through a relay contact and also
can be accessed through an Ethernet connection utilizing SNMP. A USB connection is also provided and can be
used to interface with the controller utilizing ModBus.
ENERGIZING THE CONTROLLER
The controller is wired and programmed at the factory to be energized when power is supplied to the air
conditioner.
CONTROL STATUS INDICATION
The display has numerous symbols that indicate if the controller is heating, cooling, alarming, if the compressor
is enabled, and if the ambient fan is enabled. The 3 alpha-numeric characters further describe alarms and show
the cabinet temperature by default.
SYMBOL COLOR ICON ON ICON FLASHING
1AMBER Compressor On Start-up Request
2,3,4 AMBER Not Used Not Used
AAMBER Compressor On Not Used
BAMBER Evaporator Fan On Start-up Request
CAMBER Not Used Not Used
DAMBER Not Used Not Used
EAMBER Heater Active Not Used
FRED Alarm Active Not Used
GAMBER Controller Active Not Used
HAMBER Not Used Not Used

© 2013 Pentair Equipment Protection 89074138
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DISPLAYING AND CHANGING PROGRAM VARIABLES
Access: To view and/or change parameters, press and hold the Prg and Sel buttons for greater than 5 seconds.
Press the up or down arrow buttons until “22” is displayed, then press Sel button. When “S-P” is displayed, press
Sel.
Navigation: Press up or down arrows to display sub-menus then press Sel to select the desired sub-menu. In the
sub-menu, use up or down arrows to display parameters for viewing or changing and press Sel. Use Prg button to
back out of menu levels as desired.
Adjust: Use the up or down arrows to change the parameter value then push Sel to save that setting. If Sel is not
pressed, the change to the value will not be saved. Navigate to and change other parameters as desired. When
finished, push Prg to back out of the sub-menus to the main menu.
NOTE: The display will revert to normal temperature display mode if no buttons are pressed
for 60 seconds.
OPERATING PARAMETERS
Parameter Default Value Range Description
r01 80 F 72 F to 120 F Cooling set-point
r02 7 F -Cooling differential
A04 50 F* 32 F to 60 F Heating set-point*
A05 7 F* -Heating differential*
Cooling turns on at r01 + r02, and off at r01
Heating turns on at A04, and off at A04 + A05
*Functional only on units with heater option
ALARM PARAMETERS
Parameter Default Value Description
P16 125 F High Temperature Alarm
P19 40 F Low Temperature Alarm
DISPLAYING TEMPERATURE SENSOR #2
Sensor number 2, the air outlet or condenser coil sensor, can be viewed at any time by pressing the up or down
arrow button on the front panel of the controller display. The display will revert to displaying temperature sensor
number 1 (the AC inlet temperature) after 60 seconds. Both sensors can also be read through the Ethernet and
USB connections.
COMPRESSOR RESTART TIME DELAY
A factory set 6 minute (360 second) restart delay exists to reduce residual back pressure before allowing the
compressor to restart. The compressor will stay off for the entire restart duration after the compressor is
disabled. A flashing “1” on the controller display will indicate the unit is in a compressor restart delay while
calling for cooling.
ALARM OUTPUT CONTACT
The Remote Access Control has a normally open dry contact alarm output with a resistive load rating of 250 VAC
at 3 amps. Two yellow 18 AWG wires located at the back of the air conditioner provide a connection to this output.

© 2013 Pentair Equipment Protection
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ALARM INPUT CONNECTION
The Remote Access Control can accept a dry contact/switch input via the two 18 AWG white wires located at the
back of the air conditioner. This input is associated with the controller display alarm mnemonic TP (door open
and/or smoke detected). [To use this feature, remove the splice connector connecting the two white wires and
connect customer supplied enclosure door switch in its place.]
ALARM CONDITION DISPLAY
There are seven possible non-latching alarm conditions detectable by the controller and are indicated on the
controller display. All alarms can also be accessed through the Ethernet and USB connections.
Alarm Mnemonic Description Cause Result Alarm Relay
TP General Alarm Door open and/or
smoke detected Unit turns off for duration of alarm Relay Contacts Close
LA High Pressure
Warning MALF high pressure switch opens No effect on function N/A
E1 Air Inlet Temperature
Sensor Alarm Sensor Failure Unit turns off for duration of alarm Relay Contacts Close
E2 Air Outlet Temperature
Sensor Alarm Sensor Failure Unit turns off for duration of alarm Relay Contacts Close
Ht High Temperature Alarm
Default = 125 F
Cabinet over
temperature
Alarm clears at default
setting -2 F
No effect on function Relay Contacts Close
Lt Low Temperature Alarm
Default = 40 F
Cabinet under
temperature
Alarm clears at default
setting +27 F
No effect on function Relay Contacts Close
A1 Frost Alarm Evaporator coil frozen
Alarm clears at 59 F
Compressor and
Evaporator fan off for
duration of alarm Relay Contacts Close
AIR CONDITIONER UNIT COMMUNICATION FEATURES
Air conditioner units equipped with communication capabilities provide both SNMP protocol through
Ethernet and ModBus protocol via USB. Hoffman cooling has a PC Interface Tool available for download
that can utilize either mode to communicate with the air conditioner unit.
USB COMMUNICATION
This communication mode allows direct connection of a PC to the air conditioner unit. The protocol
supported is ModBus. Use the PC Interface Tool to communicate with the air conditioner unit. A MINI-b
USB connection is provided.
ETHERNET COMMUNICATION
This communication mode allows remote connection to the air conditioner unit protocol supported by
SNMP. Customers can use their own software with the provided MIB file, or use the PC Interface Tool to
communicate with the air conditioner unit. An RJ45 connection is provided.
Note: ACU has a default IP Address of 192.168.1.2
Both Ethernet and USB communication modes allow the ability to:
• Read ACU inlet and outlet air temperatures
• Read and change Cooling Set-point and Cooling Differential
• Read and change Heating Set-point, Heating Differential
• Read and change High and Low Temperature Alarm Settings
• Read and change Gateway IP Address, Device IP Address, Subnet Mask, Trap IP Address and Community
• Read and change Unit Identification
• Read and change the state of IP addressing (static or dynamic)
• Read current Alarm Status

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SOFTWARE AND MIB FILE DOWNLOADS
The PC Interface Tool and the SNMP MIB file can be downloaded from www.hoffmanonline.com.
USING THE PC INTERFACE TOOL
The PC Interface Tool gives the user the ability to communicate with the air conditioner unit to read/write
parameters using either Ethernet or USB connections.
USB COMMUNICATION MODE
NOTE: Before connecting unit to the PC, make note of the comm ports present. After the unit
is connected to the PC, a new comm port will be added to the list. Use this new comm port.
• From Tools menu select Use Ethernet
• When Use Ethernet is unchecked, then Comm Port menu is enabled, Device IP and Community boxes are not
shown, and USB communication can be used
• To set the comm port, choose Comm Port from the Tools menu and then select the comm port from the combo box
VIEWING AIR CONDITIONER UNIT VALUES
To view Air Conditioner Unit values
• Select the ACU Values tab
• Select the Enable Comm button (the PC Interface will now be communicating with unit)
• To stop communication select the Disable Comm button
CHANGING AIR CONDITIONER UNIT VALUES
To change ACU Values
• Select the Settings tab
• Select the value to change
• Make the change to the value
• Select the Change Setting button
• Change can be verified in ACU Values tab
VIEWING AND CHANGING ETHERNET INFORMATION
To view and change Ethernet Information
• Select Ethernet Info tab
To view Ethernet Information
• Click Read Ethernet Info button
To change to dynamically assigning IP Address Mode
• Check Use DHCP Server checkbox
• Enter Trap IP Address and Community
• Click Load Ethernet Info button
To change to statically assigning IP Address Mode
• Uncheck Use DHCP Server checkbox
• Enter Device IP Address, Subnet Mask, Gateway IP Address, Trap IP Address and Community
• Click Load Ethernet Info button

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ETHERNET COMMUNICATION MODE
• From Tools menu select Use Ethernet
• When Use Ethernet is checked, Comm Port selection is disabled, Device IP and Community boxes are shown and
Ethernet communication can be used.
• Enter unit’s IP Address and Community string in Device IP and Community boxes at the bottom of the PC Interface
Tool.
Each unit has two community strings. One is a Read/Write community string (defaulted to
‘private’) that can be changed by the customer (must be 4 to 8 characters long). The other is a
Read-Only community string (‘public’) and cannot be changed.
VIEWING AIR CONDITIONER UNIT VALUES
To view Air Conditioner Unit values
• Select the ACU Values tab
• Select the Enable Comm button (the PC Interface will now be communicating with unit)
• To stop communication select the Disable Comm button
CHANGING AIR CONDITIONER UNIT VALUES
To change ACU Values
• Select the Settings tab
• Select the value to change
• Make the change to the value
• Select the Change Setting button
• Change can be verified in ACU Values tab
VIEWING AND CHANGING ETHERNET INFORMATION
To view and change Ethernet Information
• Select Ethernet Info tab
To view Ethernet Information
• Click Read Ethernet Info button
To change to dynamically assigning IP Address Mode
• Check Use DHCP Server checkbox
• Enter Trap IP Address and Community
• Click Load Ethernet Info button
To change to statically assigning IP Address Mode
• Uncheck Use DHCP Server checkbox
• Enter Device IP Address, Subnet Mask, Gateway IP Address, Trap IP Address and Community
• Click Load Ethernet Info button
ALARM LOG ACCESSIBLE WITH SNMP
• Using custom software with Hoffman cooling provided MIB file gives the ability to view a log of the last 25 alarms

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REMOTE ACCESS CONTROL PINOUT
FUNCTION NAME PIN # WIRE #
U1 OUTPUTS
COOL No1 1ORG78
C1/2 2BLK
HEAT No2 7BRN76
C1/2 3BLK
ENCL MI No3 8BLK77
C3/4 4BLK
NA No4 (na) 9BLK
C3/4 10 BLK
ALARM RELAY OUTPUT No5 12 YEL39
C5 6YEL38
NA x 5 NA
NA x11 NA
U2 INPUTS
ALARM INPUT
CONNECTION ID1 8WHT63
MALFUNCTION NC SWITCH ID2 1BLU88
NA ID3 (na) 9BLU
NA ID4 (na) 2BLU
NA ID5 (na) 10 BLU
DIGITAL INPUT GROUND ID GND 3BLU
NA Y (na) 4NA
NA GND (na) 5NA
T1, EVAP IN THERMISTOR B1 13 RED
T2, EVAP OUT THERMISTOR B2 12 RED
T1, T2 GND GND 6WHT
NA B3 11 NA
CONTROLLER POWER G 7 BLK40
CONTROLLER POWER G0 14 WHT41
U3 DATA
POWER 1RED
GROUND 2BLACK
DIRECTION 3GREEN
DATA 4WHITE

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SCHEMATIC AND WIRING DIAGRAM FOR REMOTE ACCESS CONTROL
N43 1PHASE GENERIC SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY)
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N43 460V 3PHASE GENERIC SCHEMATIC FOR REMOTE ACCESS CONTROL (ACTUAL UNIT
OPTIONS MAY VARY)
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