Nordson NH-4 Reference guide

NH-4 Heaters
Customer Product Manual
Part 1602369-03
Issued 02/20
NORDSON CORPORATION •AMHERST, OHIO •USA
C
APPROVED
US
FM
For parts and technical support, call the Industrial Coating
Systems Customer Support Center at [phone] or
contact your local Nordson representative.
This document is subject to change without notice.
Check http://emanuals.nordson.com for the latest version.

Part 1602369-03 E2020 Nordson Corporation
Table of Contents
Safety 1.......................................
Qualified Personnel 1.........................
Intended Use 1..............................
Regulations and Approvals 1..................
Personal Safety 2............................
High-Pressure Fluids 2.....................
Fire Safety 3................................
Halogenated Hydrocarbon Solvent Hazards 4.
Action in the Event of a Malfunction 4...........
Disposal 4..................................
Description 5..................................
Theory of Operation 6.........................
Identifying Groups of Heaters 6.................
NH-4 Heater Versions 7.......................
Installation 7..................................
Location and Mounting 7......................
Electrical 8..................................
Fluid Lines and Fittings 9......................
Multiple Heater Installations 10..................
Thermometer Installation 11....................
Filter Installation 12............................
Thermostat Adjustment —
Single Heater Installation 12....................
Thermostat Adjustment —
Multiple Heater Installations 12.................
Operation 13...................................
Safety Precautions 13..........................
Startup 13....................................
Thermostat Adjustments 14....................
Shutdown 14..................................
Daily Maintenance 15..........................
Troubleshooting 16.............................
Repair 17......................................
Thermostat Replacement 17....................
Thermostat Removal 17.....................
Thermostat Installation 17...................
Heat Limiter Replacement 19...................
Heater Cartridge Replacement 19...............
Fluid Heating Reservoir Replacement 19.........
Fluid Heating Reservoir Removal 20...........
High Pressure Housing Removal −
Standard Heaters Only 21..................
Fluid Heating Reservoir Installation 21.........
Parts 22.......................................
Heater Reference Chart 22.....................
Standard NH-4 Heaters 24.....................
115 Volt: Single Passage — 1700 watts 24.....
115 Volt: Twin Passage — 500 watts 26.......
115 Volt: Twin Passage — 1000 watts 28......
200 Volt: Single and
Twin Passage — 1700 watt 30...............
200 Volt: Single Passage —
Japan Only — 1700 watt 32.................
200 Volt: Twin Passage —
Japan Only — 1700 watt 34.................
230 Volt: Single Passage — 1700 watt 36.....
230 Volt: Twin Passage — 1000 watt 38.......
230 Volt: Twin Passage — 1700 watt 40.......
380 Volt: Single Passage and
Twin Passage — 1700 watt 42...............
460 Volt: Single and Twin Passage —
1700 watt 46.............................
Stainless Steel NH-4 Heaters 48................
115 Volt: Single Passage — 1700 watt 48......
230 Volt: Single Passage — 1700 watt 50.....
380 Volt: Single Passage — 1700 watt 52.....
460 Volt: Single Passage −1700 watt 54.......
200 Volt: Single Passage —
Japan Only — 1700 watt 56.................
Kits and Spare Parts 57........................
Standard NH-4 Thermostat/Heat Limiter Kit 57..
Standard NH-4 Thermostat Kit 57.............
Stainless Steel NH-4 Thermostat/Heat
Limiter Kit 57..............................
External Adjust Kit 58........................
Manual Reset Thermostat Kit — Japan Only 58.
Standard NH-4 Single Passage
Fluid Reservoir Seal Kit 58..................
Standard NH-4 Twin Passage
Fluid Reservoir Seal Kit 58..................
Stainless Steel Alternate Fitting 58............
Heater Cartridges (Standard and
Stainless Steel Heaters) 59..................
Recommended Spare Parts 59..................
Contact Us
Nordson Corporation welcomes requests for information, comments, and
inquiries about its products. General information about Nordson can be
found on the Internet using the following address:
http://www.nordson.com.
Address all correspondence to:
Nordson Corporation
Attn: Customer Service
555 Jackson Street
Amherst, OH 44001
Notice
This is a Nordson Corporation publication which is protected by copyright.
Original copyright date 2013. No part of this document may be
photocopied, reproduced, or translated to another language without the
prior written consent of Nordson Corporation. The information contained
in this publication is subject to change without notice.
Trademarks
Nordson and the Nordson logo are registered trademarks of Nordson
Corporation.
All other trademarks are the property of their respective owners.

Change Record i
Part 1602369-03
E2020 Nordson Corporation
Change Record
Revision Date Change
01 02/13 Released
02 03/17 Updated DOC and labels.
03 02/20 Added NH-4 heaters to parts list: 1617936, 1617938, 1617937, 1617939.

Change Record
ii
Part 1602369-03 E2020 Nordson Corporation

NH-4 Fluid Heaters 1
Part 1602369-03
E2020 Nordson Corporation
NH-4 Fluid Heaters
Safety
Read and follow these safety instructions. Task- and equipment-specific
warnings, cautions, and instructions are included in equipment
documentation where appropriate.
Make sure all equipment documentation, including these instructions, is
accessible to persons operating or servicing equipment.
Qualified Personnel
Equipment owners are responsible for making sure that Nordson equipment
is installed, operated, and serviced by qualified personnel. Qualified
personnel are those employees or contractors who are trained to safely
perform their assigned tasks. They are familiar with all relevant safety rules
and regulations and are physically capable of performing their assigned
tasks.
Intended Use
Use of Nordson equipment in ways other than those described in the
documentation supplied with the equipment may result in injury to persons
or damage to property.
Some examples of unintended use of equipment include
Susing incompatible materials
Smaking unauthorized modifications
Sremoving or bypassing safety guards or interlocks
Susing incompatible or damaged parts
Susing unapproved auxiliary equipment
Soperating equipment in excess of maximum ratings
Regulations and Approvals
Make sure all equipment is rated and approved for the environment in which
it is used. Any approvals obtained for Nordson equipment will be voided if
instructions for installation, operation, and service are not followed.

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Part 1602369-03 E2020 Nordson Corporation
Personal Safety
To prevent injury follow these instructions.
SDo not operate or service equipment unless you are qualified.
SDo not operate equipment unless safety guards, doors, or covers are
intact and automatic interlocks are operating properly. Do not bypass or
disarm any safety devices.
SKeep clear of moving equipment. Before adjusting or servicing moving
equipment, shut off the power supply and wait until the equipment
comes to a complete stop. Lock out power and secure the equipment to
prevent unexpected movement.
SRelieve (bleed off) hydraulic and pneumatic pressure before adjusting or
servicing pressurized systems or components. Disconnect, lock out,
and tag switches before servicing electrical equipment.
SWhile operating manual spray guns, make sure you are grounded.
Wear electrically conductive gloves or a grounding strap connected to
the gun handle or other true earth ground. Do not wear or carry metallic
objects such as jewelry or tools.
SIf you receive even a slight electrical shock, shut down all electrical or
electrostatic equipment immediately. Do not restart the equipment until
the problem has been identified and corrected.
SObtain and read Safety Data Sheets (SDS) for all materials used.
Follow the manufacturer’s instructions for safe handling and use of
materials, and use recommended personal protection devices.
SMake sure the spray area is adequately ventilated.
STo prevent injury, be aware of less-obvious dangers in the workplace
that often cannot be completely eliminated, such as hot surfaces, sharp
edges, energized electrical circuits, and moving parts that cannot be
enclosed or otherwise guarded for practical reasons.
High-Pressure Fluids
High-pressure fluids, unless they are safely contained, are extremely
hazardous. Always relieve fluid pressure before adjusting or servicing high
pressure equipment. A jet of high-pressure fluid can cut like a knife and
cause serious bodily injury, amputation, or death. Fluids penetrating the
skin can also cause toxic poisoning.
If you suffer a fluid injection injury, seek medical care immediately. If
possible, provide a copy of the SDS for the injected fluid to the health care
provider.

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Part 1602369-03
E2020 Nordson Corporation
The National Spray Equipment Manufacturers Association has created a
wallet card that you should carry when you are operating high-pressure
spray equipment. These cards are supplied with your equipment. The
following is the text of this card:
WARNING: Any injury caused by high pressure liquid can be serious. If
you are injured or even suspect an injury:
SGo to an emergency room immediately.
STell the doctor that you suspect an injection injury.
SShow him this card
STell him what kind of material you were spraying
MEDICAL ALERT—AIRLESS SPRAY WOUNDS: NOTE TO PHYSICIAN
Injection in the skin is a serious traumatic injury. It is important to treat the
injury surgically as soon as possible. Do not delay treatment to research
toxicity. Toxicity is a concern with some exotic coatings injected directly into
the bloodstream.
Consultation with a plastic surgeon or a reconstructive hand surgeon may
be advisable.
The seriousness of the wound depends on where the injury is on the body,
whether the substance hit something on its way in and deflected causing
more damage, and many other variables including skin microflora residing
in the paint or gun which are blasted into the wound. If the injected paint
contains acrylic latex and titanium dioxide that damage the tissue’s
resistance to infection, bacterial growth will flourish. The treatment that
doctors recommend for an injection injury to the hand includes immediate
decompression of the closed vascular compartments of the hand to release
the underlying tissue distended by the injected paint, judicious wound
debridement, and immediate antibiotic treatment.
Fire Safety
To avoid a fire or explosion, follow these instructions.
SGround all conductive equipment. Use only grounded air and fluid
hoses. Check equipment and workpiece grounding devices regularly.
Resistance to ground must not exceed one megohm.
SShut down all equipment immediately if you notice static sparking or
arcing. Do not restart the equipment until the cause has been identified
and corrected.
SDo not smoke, weld, grind, or use open flames where flammable
materials are being used or stored.
SDo not heat materials to temperatures above those recommended by
the manufacturer. Make sure heat monitoring and limiting devices are
working properly.

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Part 1602369-03 E2020 Nordson Corporation
Fire Safety (contd)
SProvide adequate ventilation to prevent dangerous concentrations of
volatile particles or vapors. Refer to local codes or your material SDS
for guidance.
SDo not disconnect live electrical circuits when working with flammable
materials. Shut off power at a disconnect switch first to prevent
sparking.
SKnow where emergency stop buttons, shutoff valves, and fire
extinguishers are located. If a fire starts in a spray booth, immediately
shut off the spray system and exhaust fans.
SShut off electrostatic power and ground the charging system before
adjusting, cleaning, or repairing electrostatic equipment.
SClean, maintain, test, and repair equipment according to the instructions
in your equipment documentation.
SUse only replacement parts that are designed for use with original
equipment. Contact your Nordson representative for parts information
and advice.
Halogenated Hydrocarbon Solvent Hazards
Do not use halogenated hydrocarbon solvents in a pressurized system that
contains aluminum components. Under pressure, these solvents can react
with aluminum and explode, causing injury, death, or property damage.
Halogenated hydrocarbon solvents contain one or more of the following
elements:
Element Symbol Prefix
Fluorine F “Fluoro-”
Chlorine Cl “Chloro-”
Bromine Br “Bromo-”
Iodine I “Iodo-”
Check your material SDS or contact your material supplier for more
information. If you must use halogenated hydrocarbon solvents, contact
your Nordson representative for information about compatible Nordson
components.
Action in the Event of a Malfunction
If a system or any equipment in a system malfunctions, shut off the system
immediately and perform the following steps:
SDisconnect and lock out system electrical power. Close hydraulic and
pneumatic shutoff valves and relieve pressures.
SIdentify the reason for the malfunction and correct it before restarting the
system.
Disposal
Dispose of equipment and materials used in operation and servicing
according to local codes.

NH-4 Fluid Heaters 5
Part 1602369-03
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Description
The Model NH-4 heaters are electrically operated, explosion-proof,
high-pressure fluid heaters, designed for use with both air and airless spray
systems.
1
2
3
4
5
6
Model NH-4 Heater
P/N S/N
Volts AC
Watts
Amperes
Phase 50/60 Hz
Maximum operating pressure
Operating temperature range T3C
Minimum Grade for socket head
screws in cover is Class 12.9.
PSIBAR
Nordson Cororation Amherst Ohio 44001 USA
II 2 G
1180
BAS00ATEX2170
WARNING
DO NOT OPEN WHEN
ENERGIZED OR WHEN
EXPLOSIVE ATMOSPHERE
IS PRESENT Ex db IIB T3 Gb
Figure 1 NH-4 ATEX Heaters
1. Enclosure cover
2. Fluid outlet
3. High-pressure housing
4. Fluid inlet
5. Fluid passage body
6. Electrical enclosure
See Figure 1. The standard NH-4 heater is available in both aluminum and
stainless steel versions. Refer to the Parts section for a complete listing of
available heaters.
The heater can be wall or dolly mounted. The heater consists of an
electrical enclosure (6) and a fluid section. The electrical enclosure
contains a thermostat adjustment for the heater. Most versions of the NH-4
heater have internal thermostat controls so you must remove the enclosure
cover (1) in order to change the setting.
The fluid section consists of a fluid passage body (5) and high-pressure
housing (3). The thermostat probe, heater cartridge, and heat limiter are
located within the fluid passage body.

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Part 1602369-03 E2020 Nordson Corporation
Theory of Operation
See Figure 2. The heater cartridge heats the fluid passage body (6).
Coating material flows through the inlet port (4) and the spiral passages in
the fluid passage body where it is heated then exits through the outlet
port (8).
An adjustable thermostat (7) controls the temperature. If the thermostat
fails, causing an over-temperature condition, the heat limiter (1) will sense
the excess heat and open the circuit to the heater cartridge, shutting down
the heater.
1
2
3
5
6
7
8
4
Figure 2 Cutaway View of Heater Components
1. Heat limiter
2. Spiral grooves
3. Heater cartridge
4. Inlet port
5. High-pressure housing
6. Fluid passage body
7. Thermostat
8. Outlet port
Identifying Groups of Heaters
This manual covers different types of NH-4 heaters. When procedures or
data differs, the following codes will be used:
[EXT ADJ]—This code is used for NH-4 heaters that have an external
adjustable thermostat control.
[INT ADJ]—This code is used for NH-4 heaters that have an internal
adjustable thermostat control.
[ST STL]—This code is used for stainless steel NH-4 heaters.