Friedrich Hazardgard SH20N50AT User manual

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Congratulations!
Thank you for your decision to purchase the Friedrich Hazardgard (Hazardous Duty Room Air Conditioner). Your new Friedrich has
been carefully engineered and manufactured to give you many years of dependable, efcient operation, maintaining a comfortable
temperature and humidity level. Many extra features have been built into your unit to assure quiet operation, the greatest
circulation of cool, dry air, and the most economic operation.
General Instructions
This Installation and Operation Manual has been designed to insure maximum satisfaction in the performance of your unit. For years of trouble-free
service, please follow the installation instructions closely. We cannot overemphasize the importance of proper installation. We have added new infor-
mation to the basic instructions to help you achieve proper installation.
WARNING
Refrigeration system under high pressure.
Do not puncture, heat, expose to flame or incinerate.
Only certified refrigeration technicians should service
this equipment.
R410A systems operate at higher pressures than R22
equipment. Appropriate safe service and handling
practices must be used.
Only use gauge sets designed for use with R410A. Do
not use standard R22 gauge sets.
WARNING
Please read this manual thoroughly prior to equipment
installation or operation.
It is the installer’s responsibility to properly apply and
install the equipment. Installation must be in
conformance with the NFPA 70-2008 National Electric
Code or current edition, International Mechanic Code
2009 or current edition and any other applicable local
or national codes.
Failure to do so can result in property damage,
personal injury or death.
1. Carefully read and follow the installation instructions.
2. Make sure the unit is the right capacity for the area to be
cooled. An undersized unit makes the unit work too hard,
using more electricity than needed and increases wear. An
oversized unit will cycle on and off too rapidly, and therefore
cannot control humidity very well.
3. When you rst turn on your Friedrich, set the thermostat to
its coldest position to cool the room. When the desired tem-
perature is reached, turn the thermostat control toward the
“warmer” position until you hear a click and the compressor
goes off. The thermostat will then cycle the compressor to
maintain the selected temperature.
4. Clean the lter frequently (See Filter Information)
5. Do not block the air ow to and from the unit. Make sure the
louvers are directed to give even distribution of air through-
out the room. Caution: If air directed into a restricted area
such as a corner, this may cause the unit to cycle on and off
rapidly, which could damage your unit.
6. A dir ty lter or improperly set controls can affect the cooling
ability of the unit.
7. If cooling is weak and you have veried that the lter is
clean and the controls are properly set, the unit may be low
on refrigerant, and you should call your Friedrich service
provider to check the unit.
8. Keep blinds, shades and drapes closed on the sunny side of
the room being cooled.
9. Proper room insulation helps your unit maintain the desired
inside temperature.
10. Whenever possible, shade west-facing windows with aw-
nings , trees, or window tinting.
11. Keep window treatments away from the unit to provide free
air ow.
Here are some suggestions to help you use your new Friedrich most efciently:
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual
and on your appliance. Always read and obey all safety messages.
This is a safety Alert symbol. This symbol alerts you
to potential hazards that can kill or hurt you and
others.
All safety messages will follow the
safety alert
symbol with the word “WARNING” or “CAUTION”.
These words mean:
Indicates a hazard which, if not
avoided, can result in severe
personal injury or death and damage
to product or other property.
Indicates a hazard which, if not
avoided, can result in personal injury
and damage to product or other property.
All safety messages will tell you what the potential hazard is, tell you
how to reduce the chance of injury, and tell you what will happen if
the instructions are not followed.
Indicates property damage can
occur if instructions are not followed
WARNING
CAUTION
NOTICE

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Filter Information
The lter in your Friedrich removes dust, pollen and other impurities from the air as they are drawn through the unit. The lter is
permanent and reusable, and has a germicidal treatment which is not affected by periodic washing.
A clogged, dirty lter reduces the air ow through the unit and reduces its efciency. You should check the lter every seven to ten
days, depending on the amount your unit is used. Clean the lter regularly
Figure 1
FILTER
RETAINER CLIPS
The filter can be removed for cleaning by opening the front of
the unit and releasing the filter from its retaining clips.

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• Permanent Split-Capacitor, totally enclosed fan motor to
assure efcient operation even under adverse electrical
conditions.
• Motor has a special stainless steel shaft to resist corrosion
and a hermetically sealed overload for arc-free operation.
• High capacity compressor with internal hermetically sealed
overload.
• Contains transient voltage suppressor to protect controls
against transient voltage spikes. Provides solid state switches
for arc- free operation.
• Hot gas bypass low ambient control to permit operation without
freezing at outdoor ambient temperatures as low as 45°F (7°C).
• IP44 Environmentally sealed electrical components protect
against ingress of moisture ( ATEX & IECEx )
• Polyester powder nish, oven-baked for an attractive, long-
lasting nish
• Copper tubing/aluminum hydrophilic coated n coils
• Galvanized steel cabinet and base pan, all bonderized.
• Slide-out chassis for easy installation in window or through–
the–wall.
• Extra insulation inside, including completely insulated plenum
chamber for quieter, more efcient cooling.
• Entire unit test run in environmental chamber before crating.
• Eight-way air ow control for uniform circulation
• Condensate drain with exclusive mosquito trap.
• 15amp or 20amp circuit with time-delay fuse required.
Accommodates direct wiring.
• Long lasting 3/8” (10mm) thick air lter, germicidally treated,
easily removed for cleaning
Hazardgard Special Features
Control Panel
Function Control (Power)
This switch is a double pole, single throw toggle switch.
ON - Turns everything on.
OFF - Turns everything off.
WARNING
POWER MUST BE DISCONNECTED AT
CIRCUIT BREAKER/FUSE BEFORE SERVICING!
Temperature Control
The knob at the bottom is the thermostat which is a cross ambient type
used to maintain the desired comfort level. The thermostat reacts only to
a change in temperature at the bulb location - turn the knob clockwise to
set cooler, counter- clockwise for warmer.
Friedrich leads with the rst UL Listed Room Air Conditioners designed
to cool living quarters and other enclosures situated in hazardous loca-
tions where specic volatile ammable liquids or gases are handled or
used with enclosed containers or systems.
Friedrich Hazardgard room air conditioners are designed to meet the
National Electrical Code, Article 500 requirements for Class I, Division
2, Groups A,B,C,D Hazardous locations, CERTIFIED BY UNDERWRITERS
LABORATORIES FOR USE IN CLASS 1, DIVISION 2, GROUPS A,B,C,D
HAZARDOUS LOCATIONS.
Friedrich Air Conditioning quality has been proven by more than 30 years of successful experience from the Gulf of Mexico
to the searing sands of the Arabian Desert.

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SH20N50AT and SH24N20AT Adhere to the following certications:
CERTIFIED PER STD. NO. ANSI/ISA 12.12.01,2013
PER STD. NO. IEC 60079-0, 6th Edition PER STD. NO. IEC 60079-15, 4th Edition
PER STD. NO. CAN/CSA C22.2 NO. 213-M1987
PER STD. NO. CENELEC EN 60079-0: 2012 + A11: 2013
PER STD. NO. CENELEC EN 60079-15: 2010
CERTIFICATION DEMKO 15 ATEX 1364X II 3 G Ex nA nC IIC T4 Gc
IECEX UL15.0051X DEMKO 15 ATEX 1364X
SH20N50AT & SH24N20AT
Specic Conditions of Use:
• Provision shall be made to prevent the rated voltage being exceeded by
the transient disturbances of more than 140% of the peak rated voltage..
• The equipment must be installed only for use in locations providing
adequate protection against the entry of solid foreign objects or water
capable of impairing safety.
• Only permanently wired cables may enter the cable glands. The user
shall provide for the required strain relief.
• Degree of protection will be safeguarded only when sealing and cable
entry ttings are properlytted. The Manufacturer’s instructions must
be followed.
• Cable Glands shall be mounted into the enclosurein such a way that they
are mechanically protected against impact force.
• To avoid the buildup of electrostatic charge, regularly clean the unit with
a damp cloth.
• The appliance is not to be used by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience
and knowledge, unless they have been given supervision or instruction.
Children to be supervised not to play with the appliance.
NOTICE: To maintain IP44 protection, the Hazardgard
unit must be installed in accordance to the installation
instructions stated in this document.
The following additional previous editions of Standards noted under
the “Standards” section of this Certicate where applied to integral
Components as itemized below. There are no signicant safety related
changes between these previous editions and the editions noted
under the “Standards” section.
Junction Box, Part No. 25. 10 16
08, manufactured by Rose.
IEC 60079-7:2006-
07, IEC 60079-31:
ATEX & ICEX Standards Specic to Models SH20N50AT & SH24N20AT