Pentair NHZ28 Spectracool Instruction Manual

SPECTRACOOL

Air Conditioner, HAzArdous LoCAtions

nHz28 ModeL

INSTRUCTION MANUAL

Rev. F

P/N 89117141

TABLE OF CONTENTS

General Safety Information ............................................................................................................................................................................... 3

Receiving the Air Conditioner ........................................................................................................................................................................... 3

Handling and Testing the Air Conditioner ........................................................................................................................................................ 4

How to Read Model Numbers ........................................................................................................................................................................... 4

Technical Information ........................................................................................................................................................................................ 4

General ....................................................................................................................................................................................................................4

Sequence of Operation ............................................................................................................................................................................................4

Cooling .............................................................................................................................................................................................................4

Standard and Optional Component Operation .......................................................................................................................................................5

SMART CONTROLLER ....................................................................................................................................................................................5

For cooling (75-100 F range) ..........................................................................................................................................................................5

Remote Access Control (optional) ..................................................................................................................................................................5

Head Pressure Control (optional) ...................................................................................................................................................................5

115V/230V to 10V Transformer (optional) ......................................................................................................................................................5

Door Switch .............................................................................................................................................................................................................5

Active Condensate Management ............................................................................................................................................................................5

When Used With Purge and Pressurized Enclosures ...........................................................................................................................................5

Schematics and Wiring Diagrams ..........................................................................................................................................................................6

Generic 115V Schematic (actual unit options may vary) ...............................................................................................................................6

Generic 230V Schematic (actual unit options may vary) ...............................................................................................................................6

Generic 460V Schematic (actual unit options may vary) ...............................................................................................................................7

Generic 115V Wire Diagram (actual unit options may vary) ..........................................................................................................................8

Generic 230V Wire Diagram (actual unit options may vary) ..........................................................................................................................9

Dimensional Drawing ...................................................................................................................................................................................... 11

Installation Instructions .................................................................................................................................................................................. 12

Smart Controller ............................................................................................................................................................................................. 14

Remote Access Control ................................................................................................................................................................................... 17

Remote Access Control Pin-out ...................................................................................................................................................................... 20

Maintenance .................................................................................................................................................................................................... 21

Service Data ..................................................................................................................................................................................................... 24

Trouble Shooting .............................................................................................................................................................................................. 28

Warranty .......................................................................................................................................................................................................... 30

Generic 460V Wire Diagram (actual unit options may vary) ........................................................................................................................10

Introduction ...........................................................................................................................................................................................................14

Energizing the Controller .....................................................................................................................................................................................14

Control Status Indication ......................................................................................................................................................................................14

Displaying and Changing Program Variables ......................................................................................................................................................15

Operating Parameters ..........................................................................................................................................................................................15

Alarm Parameters ................................................................................................................................................................................................15

Displaying Temperature Sensor #2 ......................................................................................................................................................................15

Compressor Restart Time Delay ..........................................................................................................................................................................15

Alarm Output Contact ...........................................................................................................................................................................................15

Alarm Input Connection ........................................................................................................................................................................................16

Alarm Condition Display .......................................................................................................................................................................................16

Air Conditioner Unit Communication Features ...................................................................................................................................................17

USB Communication.....................................................................................................................................................................................17

Ethernet Communication .............................................................................................................................................................................17

Using the PC Interface Tool ..................................................................................................................................................................................18

USB COMMUNICATION MODE .....................................................................................................................................................................18

Ethernet Communication Mode ...................................................................................................................................................................19

Compressor ...........................................................................................................................................................................................................21

Inlet Air Filter ........................................................................................................................................................................................................21

How To Remove, Clean or Install a New Inlet Air Filter ......................................................................................................................................21

Condensate Management and Drain Trap Maintenance .....................................................................................................................................21

Condenser and Evaporator Air Movers ................................................................................................................................................................22

Refrigerant Loss....................................................................................................................................................................................................22

Refrigerant Properties Chart (R134a) ..................................................................................................................................................................22

Unit Characteristics ..............................................................................................................................................................................................23

Functional Data .....................................................................................................................................................................................................23

Components List ...................................................................................................................................................................................................24

NHZ280416GXXX Pressure Tables ........................................................................................................................................................................25

NHZ280426GXXX Pressure Tables ........................................................................................................................................................................26

Basic Air Conditioning Trouble Shooting Check List - SMART CONTROLLER ...................................................................................................28

Symptoms and Possible Causes - Remote Access Control Version ...................................................................................................................29

Return and Repair Policy ......................................................................................................................................................................................30

Limitation of Liability ............................................................................................................................................................................................31

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GENERAL SAFETY INFORMATION

Please observe the following general safety instructions when assembling and operating the unit:

• Assembling, installing and servicing must only be performed by properly trained specialists.

• When transporting the enclosure with the cooling unit externally mounted, always use an additional shipping brace

to support the cooling unit.

• Do not attempt to operate the air conditioner while it is horizontal or on its side, back or front.

• Operation of air conditioner in areas containing airborne caustics or chemicals can rapidly degrade sealing

properties of materials, deteriorate filters, refrigeration coils, blowers and motors. Contact Pentair Equipment Protection for special recommendations. See Maintenance on page 21.

DANGER

Danger: explosion hazard - do not energize, disconnect, or troubleshoot equipment unless power has been switched off or the area is known to be non-hazardous.

Unit to be installed and maintained by properly trained personnel only.

Danger : Risque d’explosion – Ne pas alimenter, déconnecter ni dépanner l’équipement si l’alimentation n’a pas été coupée ou si la zone n’est pas reconnue comme non dangereuse.

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.

CAUTION

This air conditioner is suitable for use in Class 1, Division 2, Groups A,B,C, D T4A hazardous locations, or non-hazardous locations only. It is meant to be installed in an enclosure such that the field wiring and controls are only accessible with the use of a tool.

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.

Ce climatiseur peut être utilisé dans des zones dangereuses de Classe 1, Division 2, Groupes A, B, C, D T4A ou des zones non dangereuses uniquement. L’installation doit être effectuée dans une armoire de telle sorte que le câblage et les commandes sur le terrain ne soient accessibles qu’à l’aide d’un outil.

Ne pas essayer de faire fonctionner le climatiseur en position horizontale, ou posé sur le côté, l’arrière ou l’avant. Le compresseur de réfrigération est rempli d’huile lubrifiante. Cela endommagerait le climatiseur de manière permanente et annulerait la garantie.

MISE EN GARDE

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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.

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

NHZ28 04 2 6 G300

1 2 3 4 5

1. Identifies the type/family of air conditioner and the approximate height (i.e. NHZ28 = Narrow Hazardous Location family about 28 inches high).

2. This is the air conditioner’s listed capacity in BTU/Hr. at rated conditions. (i.e. 06=6,000 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.

TECHNICAL INFORMATION

GENERAL

Sensor 2 monitors the enclosure return air temperature to prevent ice buildup on the evaporator coil. If the air temperature drops below -1 C, the compressor and condenser air mover(s) shut off. They turn back on when the temperature rises above 15 C.

The compressor and the air movers are equipped with overload protection to guard against excess current and temperatures.

SEQUENCE OF OPERATION

The air conditioner comes standard with smart controller. During cooling modes, the evaporator fan will be running.

COOLING

When the enclosure temperature is above the cooling set-point plus the cooling differential, the smart controller will call for cooling. The compressor is then energized through a solid state relay or contactor. 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 pressure 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 adjust cooling set-point 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.

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STANDARD AND OPTIONAL COMPONENT OPERATION

SMART CONTROLLER

The standard NHZ28 air conditioner uses our standard smart controller. The setpoint equals the temperature that the air conditioner turns off. The controller has a 7 F differential from setpoint until it calls for cooling. An example of operation is shown below.

FOR COOLING (75100 F RANGE)

• Thermostat setpoint = 80 F

• Cooling turns on at 87 F

• Cooling turns off at 80 F

REMOTE ACCESS CONTROL (OPTIONAL)

See Remote Access Control on page 17

HEAD PRESSURE CONTROL (OPTIONAL)

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 117 F (165 psig), the condenser fans will power on.

115V/230V TO 10V TRANSFORMER (OPTIONAL)

This transformer powers the thermal display.

DOOR SWITCH

Several door switches may be connected in series and operated on one cooling unit. The door switch only supports a floating connection,no external voltages. Remove jumper from terminals 3 and 4 of the connector and connect the door switch to the two terminals if a door switch is available.

ACTIVE CONDENSATE MANAGEMENT

At low temperatures and high humidity levels inside the enclosure, condensation may form on the evaporator coil. The air conditioner will continuously evaporate the water that may be in the drain pan due to condensation from

the evaporator coil into the external air stream. Excess condensate is routed downwards out of the air conditioner via a tube fitting at the bottom of the condenser side of the unit. A 10 mm inside diameter tube can be attached to the fitting and routed to a nearby drain.

WHEN USED WITH PURGE AND PRESSURIZED ENCLOSURES

This air conditioner will operate safely in a Class 1 Division 2 Groups A, B, C and D hazardous location on both exterior and interior sides. It does not require a purge and pressurized enclosure, but if it is to be installed on one, the following should be considered.

The active condensate management system functionally described above is possible due to a drain trap directly connecting and routing condensation from the evaporator coil pan to the ambient side where it collects in the condensate evaporator pan.

During initial purging of an enclosure or after long periods of operation in a pressurized system utilizing a dry protective and/or inert gas supply, the drain trap can eventually dry out and allow a small amount of protective gas to leak outward of the enclosure through the drain trap. A leakage should not immediately be associated with a hazardous condition. If continuous positive pressure is maintained inside an enclosure, the protective gas will leak out to ambient and prevent hazardous gasses from entering. A typical enclosure pressurization system can compensate for this and maintain proper enclosure pressure.

If the pressurization system cannot compensate for the additional leakage, a drain trap seal can be created by priming the air conditioner drain. This can be done by de-energizing and opening the enclosure for access to the evaporator coil, and carefully pouring clean water (approx. 1 cup) into the face of the coil. With water present, the drain trap should be fully primed and sealed. Opening the enclosure can also introduce humidity back into the enclosure which will eventually condense on the evaporator coil and become part of the seal in the drain trap.

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