Frick AGHN Owner's manual

This manual contains rigging, assembly, start-up, and maintenance
instructions. Read thoroughly before beginning installation. Failure
to follow these instructions may result in personal injury or death,
damage to the unit, or improper operation.
EVAPORATORS AND AIR COOLERS
AGHN/AXGHN, MANP/MXANP,
MDAN/MDXAN, AGBF, GHN, MDN, and GGHN
Check www.FrickCold.com for the latest version of this publication.
Form 610.020-IOM (NOV 2019)
INSTALLATION–OPERATION–MAINTENANCE
File: SERVICE MANUAL–Section 070
Replaces: NOTHING
Dist: 3, 3a, 3b, 3c

610.020-IOM (NOV 19)
Page 2
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
Indicates a potentially hazardous situation or practice which, if not avoided, will result in death or
serious injury.
SAFETY PRECAUTION DEFINITIONS
Indicates a potentially hazardous situation or practice which, if not avoided, will result in damage
to equipment and/or minor injury.
Indicates an operating procedure, practice, or portion thereof which is essential to highlight.
WARNING
CAUTION
DANGER
NOTICE
Safety information
Safety instructions ............................................................ 3
Refrigerant safety.............................................................. 3
General information
Warranty statement .......................................................... 3
Product lines ..................................................................... 4
Installation
Receiving and inspection................................................... 5
Air cooler location ............................................................ 5
Air cooler mounting .......................................................... 5
Operation
Pre start-up ...................................................................... 6
Start-up ............................................................................ 6
Post start-up..................................................................... 6
Electrical wiring
Field wiring ....................................................................... 6
Motor wiring ..................................................................... 7
Fans ................................................................................. 7
Refrigerant piping
Defrost piping
Condensate drain piping.................................................... 7
Water defrost piping ......................................................... 7
Contents
Defrost
Air defrost......................................................................... 8
Hot gas defrost ................................................................. 8
Electric defrost.................................................................. 8
Water defrost.................................................................. 10
Transportation and rigging
Packing information ........................................................ 10
Rigging.............................................................................12
AGHN/GHN/GGHN/MHF (<071 Ø) .................................12
AGHN/GHN/GGHN/MHF (071 Ø and >) .........................13
MDN ........................................................................... 14
MANP ..........................................................................15
GBF/AGBF/GGBF ......................................................... 16
MBK/AGBK/MGBK ....................................................... 17
Maintenance
Fan motors and heaters ................................................. 18
Drain pan ....................................................................... 18
Routine maintenance ...................................................... 18
Monthly ...................................................................... 18
Biannually................................................................... 18
Cleaning ..................................................................... 19

610.020-IOM (NOV 19)
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EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Safety information
SAFETY INSTRUCTIONS
• Installation and maintenance must only be carried out
by qualied personnel who are familiar with this type of
equipment.
• Always wear safety glasses, gloves, and head protection
when working on the equipment.
• Avoid contact with sharp edges and exposed nned sur-
faces because these can cause painful lacerations.
• The equipment can be pressurized with dry air during
manufacturing.
• Properly evacuate all units before charging the system.
• Disconnect all power sources before carrying out any
service work on the units.
• Never apply heat to a sealed refrigeration system.
• Keep hands away from the fans when the unit is running.
• Ensure all mounting bolts are tight and are the correct
length for the specic application.
• Maintain all safety labels on the unit in good condition. If
required, replace with new labels.
• Check all eld wiring and be in strict conformity with the
equipment requirements and all applicable national and
local codes.
• Use the name plate electrical data for conductor and
fuse sizing.
REFRIGERANT SAFETY
WARNING
Although halocarbon refrigerants are classied as safe
refrigerants, certain precautions must be observed
when handling them. Refrigerant can be harmful if
inhaled. When released to the atmosphere in the liquid
state refrigerants evaporate rapidly, freezing anything
they contact. Refrigerants must be used and recovered
responsibly.
Failure to follow this warning may result in personal
injury or death.
WARNING
Failure to comply with any of these requirements could
result in serious damage to the equipment and/or the
property where it is installed, and personal injury and/
or death to themselves and/or people at the specic
location.
DANGER
Anhydrous Ammonia (NH3)
Specic precaution must be adhered to when people are
working with or are exposed to Anhydrous Ammonia.
Ammonia is considered a high health hazard because
it is corrosive to the skin, eyes, and lungs. Exposure
to 300 parts per million (ppm) is immediately danger-
ous to life and health. Ammonia is also ammable at
concentrations of approximately 15% to 28% by volume
in air. When mixed with lubricating oils, its ammable
concentration range is increased. It can explode if re-
leased in an enclosed space with a source of ignition
present, or if a vessel containing anhydrous ammonia
is exposed to re.
Personal protective equipment must be worn at all
times when working with Ammonia. For systems that
have an operating charge greater than 10,000 lb, a
process safety management program is mandatory.
More information on this topic is available from OSHA.
Failure to follow this warning may result in personal
injury or death.
General information
FRICK® evaporators and air coolers are designed to pro-
vide optimum efciency and an extended life when prop-
erly installed, operated, and maintained. The development
of a comprehensive maintenance schedule is suggested,
to be undertaken on a regular pre-determined basis. This
manual can assist the owner/operator in developing such a
schedule.
This equipment is relatively complicated and only suitable
individuals who are qualied to carry out these functions
can perform installation, operation, maintenance, and
servicing. These individuals must also be familiar with, and
comply with, all applicable governmental standards and
regulations pertaining to the functions.
The type of refrigerant and method of feed to the evapo-
rator must comply with what is indicated on the submittal
drawings and the unit’s nameplate.
Never exceed design operating pressures, as indicated on
the nameplate.
Evaporators and all piping systems must be correctly
evacuated before charging the system with refrigerant.
This ensures the complete removal of moisture and non–
condensables from the entire refrigerant circuit.
WARRANTY STATEMENT
FRICK warrants the product to be free from defects in
workmanship and materials under normal usage for a pe-
riod of 24 months from the date of purchase (the “Warran-
ty Period”), provided that the product is correctly installed
and operated within the recommended limits of FRICK’s
technical documentation. This warranty is only valid if the
product is given normal and proper use and complies with
FRICK‘s installation and maintenance instructions. FRICK
assumes no responsibility for repairs to a product sustain-
ing damages resulting from user modications, attach-
ments to the product, misuse, alteration or negligent use.

610.020-IOM (NOV 19)
Page 4
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
FRICK, at its option shall repair or replace, free of charge
to the buyer, all components of the product which are or
become defective during the Warranty Period because
of defects in design, workmanship or materials, ordinary
wear and tear excluded, provided, however, that:
• The product is applied correctly
• All operating and installation instructions for the product
are complied with
• System component and piping design is in accordance
with state-of–the-art HVAC practice
• Nitrogen or an inert gas is introduced into the piping
during the brazing of the piping installation
In all instances, industry standard refrigeration practices
must be observed and followed by certied refrigeration
technicians, mechanics, pipe tters, design engineers, and
any other personnel involved in installing and servicing
FRICK products. This warranty shall not include ordinary
maintenance or cleaning of the product, defects in the
installation of the product or defects in turning and moving
parts. This warranty also does not cover physical damage
to the product, during transit or otherwise, after purchase
of the product but before installation.
The buyer must request repair or replacement of the
defective component through a written notice delivered to
FRICK no later than two business days after the buyer be-
comes aware of the defect. The buyer must provide FRICK
with the time and opportunity to make repairs or replace-
ment. Otherwise, FRICK will be released from liability
for the defect. Under no circumstances will FRICK make
any repair or replacement without FRICK’s prior written
consent, except to the limited extent permitted by FRICK’s
Service Policy.
Any transport and exchange costs for the repair or re-
placement shall be borne by the buyer. FRICK shall also
not be liable for costs incurred in dismantling or tting
replacement parts or for any independent inspection un-
dertaken by the buyer. The buyer shall return any allegedly
defective goods, postage or freight paid, to FRICK at the
address below. Upon receipt of the goods and inspection
thereof, FRICK shall repair or replace, at FRICK’s discre-
tion, the defective components and shall return the same
to the buyer, return postage and freight paid. This shall
constitute full compliance with FRICK’s warranty obliga-
tions hereunder. FRICK accepts no liability for the direct or
indirect consequences of any modications of or repairs to
the product made by the buyer or by a third party without
the prior consent of FRICK. FRICK reserves the right to in-
spect the product for customer abuse during the warranty
period if abnormal claims against the equipment arise.
This warranty shall not apply to FRICK products which
have been improperly installed or repaired, or altered in
any way outside of the manufacturer’s factory or have
been subject to misuse, negligence, or accident. Equip-
ment or component parts such as valves, electric motors,
electric heaters, and electric accessories manufactured
by others and used as part of or in connection with FRICK
products, carry only the warranty of the manufacturer
thereof. This warranty shall be void if equipment has been
subjected to negligence, abuse, misuse, low voltage, cor-
rosive chemicals, excessive pressure, accident, outward
damage, or hidden damage while in transit, or if operated
contrary to the manufacturer’s recommendations.
This warranty applies only to the repair or replacement of
the product and/or its components and expressly excludes
responsibility for damages not occurring to the product
and/or its components themselves and for consequential
damages. This warranty is the buyer‘s exclusive remedy,
and any implied warranty of merchantability or tness is
excluded. FRICK shall not be liable to the buyer or to any
customer of the buyer under any circumstances for any
direct or indirect damages, injury to persons or property
or any consequential or incidental damages or loss of
prots, including, without limitation, loss of refrigerant,
loss of stored goods, lost sales, orders, prots or income,
either gross or net, arising, directly or indirectly, from
defective goods or workmanship or from any other cause
whatsoever.
PRODUCT LINES
See Table 1 for the product lines included in this manual.
Take note of the respective product families into which the
variations are incorporated.
Table 1: Product lines
Aircoolers/Evaporators
Unit typeRefrigerant/Fluid Family
HFC NH3Glycol
GHN AGHN/XGHN GGHN GHN Unit cooler/ceiling hung
MDN MDXAN — MDN Dual coil
—MANP/
MXANP — MANP/MXANP Product cooler
— — — MHF Unit cooler/ceiling hung
— — — GHK Unit cooler/ceiling hung (steel)
— AGBF — GBF Workroom cooler
— — — GBK Process room cooler

610.020-IOM (NOV 19)
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EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Installation
RECEIVING AND INSPECTION
All units are factory tested to ensure safe operation and
quality assembly. Units are packaged for easy handling and
storage at the job site. Upon delivery, inspect all compo-
nents for possible shipping damage or shortages. Record
torn or broken packaging and scratched or damaged pan-
els on the delivery receipt and report to the carrier imme-
diately. Report any damage or shortages discovered after
unpacking to the carrier in the allotted time after delivery.
Inspect the refrigerant circuits to conrm that no leaks
have occurred during the shipment. If there is no holding
charge in the unit, it is possible that the coil was damaged
during shipment. Pressure test the coil dry nitrogen to
conrm there are no leaks.
Take photos of all damaged equipment, if possible. Dam-
aged equipment is the responsibility of the designated
carrier. Do not return to the manufacturer unless prior
approval is given to do so. Conrm that all items listed on
the bill of lading are received, especially loose items such
as air throw streamers, inlet hoods, and fan guards.
NOTICE
Record any unit damage and shortages on the bill of
lading and report to the carrier and FRICK factory
immediately. Shipping and handling damages are not
warranty items.
Compare the data on the nameplate of the unit with the
ordering and shipping information to verify the correct unit
is received. Verify the model nomenclature and electrical
data with the original order.
The unit can be transported with a forklift, with the forks
extended completely underneath the skid in the center of
the unit. Do not allow the forks to make contact with the
unit. See Rigging instructions for greater detail.
The unit is intended for indoor use only. To protect the
unit from damage due to the elements, store the unit in
a clean, dry location and away from areas with exces-
sive trafc. The unit must remain on its skid, which is only
removed at the time of installation. Ventilate the unit well
at all times during storage.
NOTICE
Always ensure that there is no obstruction to the air
intake or discharge for every unit.
AIR COOLER LOCATION
• Never locate units directly above doorways. Locate units
as far away as possible from areas of high inltration.
• The location of the units must allow for the air pattern
to cover the entire room.
• Ensure the distance of the air inlet side of the coil from the
wall is at least 0.8 x face height to prevent obstructed air-
ow patterns. The face height is the height of the evapo-
rator coil without the frame.
• Position the unit in relation to racks, aisles, lighting, and
the product so that air leaving the unit is not obstruct-
ed. The performance of the unit is determined by the
specied air quantity owing across the coil, and the
inlet temperature of this air as stated in the submittal
documentation. If either of these are compromised, the
performance of the unit may be adversely affected.
• Do not connect the unit to ducting on either the air inlet
or air leaving side, unless it has been specically engi-
neered to do so and all external pressures have been
accounted for.
• Position the unit in relation to the compressor room to
minimize pipe runs.
• Position the unit to minimize condensate line runs.
• The size, shape, and specic location of the room deter-
mines the number and type of units to use.
• Ensure sufcient access at the sides, back, underneath,
and front of the unit is available for maintenance work
to be undertaken. A minimum of 3 ft (1 m) is generally
sufcient at the sides and in front of the unit. The 0.8 x
face height must be the minimum distance at the back
of the unit on the air inlet side. Bottom clearance for the
removal of the pan must be the width of the unit at a
minimum.
• Units with electric defrost require an access area the
same length as the side of the unit from which the elec-
trical elements are being removed. This is the refriger-
ant connection end of the unit.
• Ensuring optimum performance of the unit with unob-
structed airow is the responsibility of the installing
contractor.
AIR COOLER MOUNTING
Most units can be mounted with threaded rod or bolts
suspended from the steel or ceiling structure above the
unit. Take care to ensure that the unit is mounted level so
that condensate drains properly. The steel or ceiling struc-
ture must be strong enough to support the unit. All the
mounting holes in the hangers on the unit must be used
for supporting the unit. In some instances, for example
seismic, the installing contractor might require additional
bracing. Mount foot mount units on the oor or steel
structure, either bolting or welding them to the support
structure. Ensure that the support structure is level.
NOTICE
Never position air coolers directly above doors or door
openings.
Ensure that a space equal to 0.8 x unit height between
the wall and air inlet side is maintained.
Always allow for a space equal to the unit height below
the unit.
Do not stack product directly in front of the unit.

610.020-IOM (NOV 19)
Page 6
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Operation
PRE START-UP
• Check all electrical and refrigerant connections.
• Ensure unit voltage as indicated on the nameplate
matches supply voltage.
• Conrm that the air cooler is wired in accordance with
all applicable local and national standards.
• Ensure the unit is securely mounted and fastened at the
hanger points and the unit is level.
• Conrm all fasteners for fans and motors are tight.
• Ensure that all service valves for liquid supply, suction,
and hot gas feed lines are open.
• Conrm proper drainage of condensate from the drain
pan.
• Check operation of condensate drain heaters.
START-UP
• Check all screwed connections, especially at moveable
parts.
• Check tube connections. Make sure that brackets are in
place and connection screws are secured.
• Check electrical connections of motors, heater ele-
ments, and any additional components, if applicable.
• Run the fans and check the direction of rotation. Make
sure that there is no transport damage.
• Properly purge the system of all air, evacuating Freon
and ammonia units.
• During the test run, observe the equipment and check
the following:
- Silent operation of the fans (bearings, contacts, bal-
ance)
- Power requirements of electrical motors
- Leakages
- For direct expansion applications, check superheat
- After 48 hours of operation, recheck the equipment,
specically all rotating parts.
POST START-UP
• Conrm the correct rotation of all impellers.
• High moisture load in new rooms can lead to rapid frost
accumulation on the nned surface. It may be necessary
to initiate a manual defrost.
• Conrm that the air unit has the correct refrigerant
charge.
• Pull down after start up may result in higher than normal
suction pressure, which could cause nuisance tripping of
compressor overloads.
• Check drain pan for proper drainage.
• Check thermostatic expansion valves for proper super-
heat settings.
• Adjust all adjustable controls and valves in the eld to
meet required operating conditions.
Electrical wiring
FIELD WIRING
WARNING
All wiring must be undertaken by qualied personnel
in accordance with national and local electrical codes
and standards.
NOTICE
All wiring must be in accordance with all local and
national codes.
NOTICE
Refer to the submittal documentation and unit name-
plate for voltage information.
NOTICE
Electrical drawings indicate "nameplate" amps. Oper-
ating motor amps can be found on submittal drawing.
Before wiring the equipment, conrm that the electrical
supply is in accordance with the electrical information on
the unit nameplate and unit wiring schematics shipped with
the unit. All electrical components such as circuit breakers,
branch circuit protection, contactors, overload relays, and
wire sizing must be in accordance with national and local
electrical codes and standards. The wiring schematics
shipped with the unit provide the design motor amps and
protection ratings required for branch circuit protection,
disconnects (fused or non-fused) and thermal overload
relays.
Motor protection and supply wire sizing must be suffi-
ciently sized to accommodate the increase in motor amp
draw due to lower temperatures and increased air density.
See Table 2.
Table 2: Motor amperage correction factor vs.
room temperature
Room
temperature
°F
40 30 20 10 0 -10 -20 -30 -40
Amperage
correction
factor
1.06 1.09 1.11 1.13 1.15 1.18 1.21 1.24 1.27
Before operating the unit check all wiring connections,
including factory terminals, because these could vibrate
loose during shipment.
Units are shipped with each of the motors wired to a ter-
minal strip within a common junction box – unless other-
wise requested. It is the installing contractor’s responsibil-
ity to provide the power supply wiring to the unit terminal
block or disconnect switch option.

610.020-IOM (NOV 19)
Page 7
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
NOTICE
Use copper conductors only.
WARNING
Before performing any service work on the equipment,
particularly in the vicinity of the fans or any other mov-
ing part, ensure that the correct electrical precautions
are adhered to. All electrical switchgear for the fans
must be disconnected, locked out and tagged out.
MOTOR WIRING
All external rotor motors are shipped with internal thermal
contacts. These contacts are not an internal overload pro-
tection device, but thermal contacts that open when over-
heated. The thermal contacts can be incorporated into the
control circuit wiring for added motor protection. Motor
start protection (MSP) and thermal overload protection
can be supplied upon request. NEMA motors are shipped
without internal overload protection, except for the AGBF
product line, but can be supplied upon request.
Branch circuit, feeder circuit, motor starters, overload
relays, and all wire sizes must be in accordance with all
applicable local and national codes.
FANS
The EC and ZA fans are essentially maintenance free and
are provided with durable lubrication appropriate to the
temperature range of their application. For NEMA motors,
periodic manual lubrication may be necessary according to
the maintenance schedule.
For thermal motor protection, use and wire the installed
thermo contacts according to the circuit diagram in the
submittal drawing package.
Refrigerant piping
Install all refrigerant piping and piping components in
accordance with either the IIAR Refrigeration Piping
Handbook (Ammonia or Carbon Dioxide) or the relevant
Systems and Practices chapters of the ASHRAE Handbook
(Halocarbons or Brines). Insulate all piping in accordance
with ASHRAE standards.
Units are supplied with multiple refrigerant connections,
factory sealed and pressurized to 30 psig (+/- 2 psig) to
remain sealed until ready for piping into the refrigeration
system. The connections on the units are not designed to
support any eld piping or piping components. Design and
support eld piping independent of the unit to minimize
the transmission of vibration and allow for thermal expan-
sion and contraction, and to inict no load on the unit
connections.
Units with stainless steel tubes and piping are supplied
with black steel stubs at the end of each connection piece
to facilitate eld piping or welding. These can be supplied
as stainless steel if required. Do not use the supplied con-
nections as a reference for system piping. Base the system
piping dimensions on industry accepted, good engineering
design principles.
For direct expansion units, select expansion valves in ac-
cordance with selection data and as required by expansion
valve manufacturer. Use expansion valves with external
equalizers. After the temperature has reached design
condition, adjust the expansion valve to obtain 8°F to 10°F
superheat at the suction line. For ammonia direct expan-
sion with superheating less than 18°F, use an electronic
expansion valve. Use suction traps when and if the suction
line rises above the unit cooler or heat exchanger.
Defrost piping
CONDENSATE DRAIN PIPING
Keep condensate drain lines as short as possible within the
refrigerated space and trap individually. Pitch all conden-
sate drain lines at a 3/8 in. inclination per linear ft (3 cm
inclination per linear m). Pipe drain lines from each unit to
an independent trap to prevent the migration of warm air
through the condensate drain lines. This is critical when
multiple units' drain lines are piped to a common drain line
header. The reverse ow (migration) causes ice buildup
in the drain pans if the room temperature is below 32°F
(0°C). This ice buildup blocks the drain outlet and traps the
condensate within the drain pan. Preferably, position traps
outside of freezer spaces and in warm locations. When
the trap is located in an area where the temperature never
drops below freezing, do not heat the trap. If heated, there
is a possibility of the condensate within the trap boiling off
and drying out the trap.
To prevent freezing, heat and insulate all condensate drain
piping and traps in spaces with temperatures below 34°F
(1°C). Heating elements must be energized continuously.
The values below are generally industry accepted for drain
line heater wattages:
+20°F (-7°C): 10W / linear ft (33 W/m)
0°F (-18°C): 20W / linear ft (65 W/m)
-20°F (-29°C): 30W / linear ft (100 W/m)
Ensure the condensate drain line sizing is the same dimen-
sion, at a minimum, as the outlet connection on the unit. A
union piped into the outlet from the unit is recommended
and enables disconnect of the drain line for heater repair,
replacement, and maintenance.
NOTICE
Always use two wrenches to fasten the condensate
drain pipe union. Do not apply torque to the tting on
the drain pan.
WATER DEFROST PIPING
All water lines within refrigerated spaces must be insu-
lated and heat traced to prevent these lines freezing. Lines
must also be pitched up to 1/2 in. per linear ft to allow the
water to drain at the completion of the defrost period.
Install a solenoid valve in the water supply line to each
unit, which opens under the control of an automated timer
to allow water ow to the units. See the Water Defrost
section for more details on pipe sizing and control require-
ments.

610.020-IOM (NOV 19)
Page 8
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Defrost
All air coolers operating with coil surface temperatures
beneath freezing (32°F [0°C]) experience some form of
frost accumulation. In order to maintain the performance
of the coil, it is imperative that some form of defrosting
is incorporated into the system. The defrosting of the coil
is accomplished by air, for rooms above 36°F (2.2°C), hot
gas, electric, or water. See Table 3.
AIR DEFROST
For applications where the room temperature is above
freezing, defrosting of the nned surface area is possible
by closing the liquid feed to the coil and allowing the fans
to continue running. The warmer air passing over the coil
melts the frost accumulation but the rate of frost melt is
dependent on the frost formation and room temperature.
Only use air defrost when the room temperature is above
36°F (2.2°C).
HOT GAS DEFROST
Most refrigeration systems incorporate a central compres-
sor room. This is an ideal source for hot gas and only re-
quires the piping to make it available for the evaporators.
The latent heat content of the vapor makes this method of
defrosting very effective and is essentially a by-product of
the refrigeration system. It is essential that not more than
1/3 of the evaporators in the system are defrosted
simultaneously.
Reverse cycle defrost is not recommended for non–
commercial applications. Always use forward cycle, which
requires a three-pipe arrangement at the evaporator, the
third pipe being the hot gas supply line. The hot gas ow
through the unit must always be a series arrangement,
rst through the pan section and then into the coil from
top to bottom. For DX applications using a distributor,
the hot gas feed into the coil must always be through the
distributor, not reverse cycle.
Incorporate a soft start hot gas solenoid valve in the valve
station into evaporators with capacities greater than 15
tons (52 kW). This valve allows the coil to ease up to the
hot gas pressure and prevents problems such as check
valve chatter, liquid hammer, and piping vibrations.
The pump out phase is critical to optimum defrost per-
formance. Additionally, if liquid is still present in the tubes
when the hot gas enters the coil, condensate induced
hydraulic shock is possible, which can have severe conse-
quences including ruptured pipes.
Hot gas piping located within the refrigerated spaces or
outdoors in cold climates must be insulated. It is also
recommended to have liquid drainers installed in these
lines to prevent liquid condensate entering the evaporator
during the defrost phase.
The hot gas mass ow supplied to the evaporator is de-
pendent on the capacity of the unit and the hot gas pres-
sure entering the evaporator. It is insufcient hot gas ow
to the evaporator that results in poor defrost performance,
rather than insufcient hot gas pressure and temperature.
See Table 4 for recommended hot gas pressures at the
evaporator.
The sequence of hot gas defrost operation and recom-
mended stage duration is indicated in Table 5.
ELECTRIC DEFROST
For DX halocarbon applications the most common method
of defrost is with electric heater rods. The heaters are
placed in both the coil and the pan section. The heater
rods are installed within support tubes in the coil bundle
and held in place with C clips, which are positioned so that
there is sufcient space for the rods to expand and con-
tract due to the thermal changes. All heater rods require a
pull space for removal or replacement that is equal to 0.8
x the coil length.
Figure 1: Drain line and water defrost piping
Regulating valve
Main water supply
Shut-off valve
Soleniod valve
Water defrost supply lines and
drain lines pitched 3/8 in. per ft
Regulating valve at each defrost/
unit connection

610.020-IOM (NOV 19)
Page 9
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Table 3: Defrost types based on room temperature
Temperature Air
defrost
Water
defrost
Electric
defrost
Hot gas
defrost
High temperature > 40°F (4.4°C) Yes No No No
Medium temperature > 20°F (-6.7°C) < 40°F (4.4°C) No Yes Yes Yes
Low temperature < 20°F (-6.7°C) No Yes Yes Yes
Ultra low temperature < -40°F (-40°C) No No Yes Yes
Note: Insulated pans are recommended for any application with a room temperature below freezing.
Table 4: Hot gas pressures at the evaporator
Refrigerant Required pressure at evaporator, psig (bar)
R22 90 to 110 (~6 to 7.5)
R404a 115 to 140 (~8 to 9.5)
R507A 115 to 140 (~8 to 9.5)
R134a 50 to 65 (~3.5 to 4.5)
R410a 155 to 185 (~10.5 to 12.5)
NH380 to 100 (~5.5 to 7)
Table 5: Hot gas defrost - sequence of operation
Defrost stages
Time in
minutes
(approx.)
Control Valves
Liquid
solenoid
(LSV)
Suction
solenoid
(SSV)
Delay
Soft hot
gas sole-
noid valve
(SHGSV)
Hot gas
solenoid
valve
(HGSV)
Bleed sole-
noid valve
(BSV)
Fan motor/
motors
running
Refrigeration mode xx — — yes
Pump out period 10 - 30 —yes
Delay 5 s - 10 s —no
Soft gas period 1 - 2 — — no
Hot gas period 5 - 30 —no
Equalizing period 2 - 5 —no
Fan delay period 1 - 3 — — no
Refrigeration mode xx — — yes
=Solenoid open
Table 6: Wattages for electric defrost
Temperature range Wattage per ft2of coil surface area
Medium temperature > 20°F (-6.7°C) < 40°F (4.4°C) 6 to 8
Low temperature < 20°F (-6.7°C) 8 to 12
Ultra low temperature < -40°F (-40°C) 12 to 15

610.020-IOM (NOV 19)
Page 10
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
The heater rods for the drain pan section are attached
to the underside of the heater sheet which is positioned
below the coil and held in place with clips. All wiring for
heater rods is terminated within a junction box located on
the end tube sheet of the unit.
Wattages for heater elements depend on the room tem-
perature. Check carefully at the time of selection. See
Table 6.
WARNING
Before performing any service work on the equipment,
particularly in the vicinity of the fans or any other mov-
ing part, ensure that the correct electrical precautions
are adhered to. All electrical switchgear for the fans
must be disconnected, locked out and tagged out.
WATER DEFROST
For water defrost to function correctly it is essential that
an adequate supply of suitably warm water (> 55°F [13°C])
is available at the job site. The defrost method consists
of the water being evenly distributed over the coil from a
water distribution pan positioned on top of the coil. Water
ow is required until all frost has been melted off the
nned surface.
Control the ow rate by regulating a balancing valve,
located at the inlet to each unit. See Table 7 for water
ow pipe sizing. Adjust the ow to ensure full coverage of
the coil plan area and take care not to allow the water dis-
tribution pan to overow. Flow rate requirements for each
unit are indicated on the submittal drawings. During the
setup and commissioning, the defrost operation must be
carefully observed to ensure that the entire coil is cleared
of frost. The time required to clear the coil can vary from 3
mins to 15 mins. Never exceed 15 mins. If this is the case,
there may be inadequate water supply or inlet tempera-
ture may be too low.
All water lines within refrigerated spaces must be insu-
lated and heat traced to prevent these lines freezing. Lines
must also be pitched up to 1/2 in. per linear ft to allow the
water to drain at the completion of the defrost period.
Large volumes of water also require adequately sized
condensate drain lines. See Table 8. Condensate drain lines
must have a minimum inclination of 1/2 in. per linear ft.
Sufcient fall from the drain pan outlet is required before
entering the trap. This enables the static head to over-
come the pressure drop of the water ow through the trap.
Always locate the traps outside the refrigerated space.
Condensate lines must be heat traced and insulated.
Transportation and rigging
PACKING INFORMATION
All FRICK air coolers are crated so they can be removed
from a truck with a forklift or a crane. When lifting any
unit with a forklift it is essential that the forks extend the
full span of the skid and do not make contact with any
portion of the unit.
Units are either plastic wrapped with a heavy duty plastic
wrap and positioned on a skid or have wood crating
around and on top of the unit, also placed on a skid.
When using a crane to lift the unit, use only the desig-
nated lifting points as detailed on the rigging drawing
attached to the unit at the time of shipping. Always ensure
that the lifting points are balanced and evenly spread.
NOTICE
Never lift unit by placing forks in direct contact with
the lower portion of the unit or the drain pan.
Table 7: Pressure and diameter
Pressure
drop,
psi/100
Pipe diameter, in.
1 1 1/4 1 1/2 2 2 1/2 3 4 5
2817 23 50 89 144 307 553
5 13 26 38 81 146 236 504 906
10 19 28 56 118 213 344 733 1318
15 24 49 69 147 265 428 912 1640
20 28 56 81 172 309 500 1065 1916
30 35 70 101 214 385 622 1326 2385
40 40 81 117 250 450 727 1549 2786
Table 8: Water ow rates for different pipe diameters
Flow rate from
drain pan (gpm)
15 17 23 50 89 144 307
Pipe diameter
(in.)
2 26 38 81 146 236 504

610.020-IOM (NOV 19)
Page 11
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Leave the skid on the unit and use this to lift the unit with
a forklift. Only remove the skid once the unit is mounted
to the ceiling supports. Ensure all support rods are
adequately sized to support the load. Refer to the submit-
tal drawings for the unit weight.
The equipment can be mounted using rod hangers, lag
screws, and bolts. Hang units level so that the condensate
drainage is properly maintained. Proper airow through
the unit is essential for efcient performance and main-
tenance of design storage temperatures. The minimum
spaces provided in Table 9 are recommended for unre-
stricted airow.
Table 9: Minimum spaces
Notes:
1. Do not place the cooler directly over or next to a door.
2. Do not place product directly in front of the cooler.
3. Do not place coolers in front of each other at a distance less
than their air throw, as indicated in the technical specication
sheet.
4. For electric defrost units, make sure to leave free space of at
least the length of the unit on the electric connection side to
remove the heaters in case of failure.
5. Dimensions B and C can be reduced to minimum of 6 in. on the
refrigerant connection side and for air defrost units.
6. Use deector plates for installations when dimension D is less
than the air throw indicated in the technical specication sheet.
7. If you have reduced space or special room construction, contact
your local sales ofce for advice on unit mounting.
Model type A B* C* D*
MDN 7 ft Finned
length of
the coil
Finned
length of
the coil
Air
throw of
unit
MDAN-MDAS 7 ft Finned
length of
the coil
Finned
length of
the coil
Air
throw of
unit
MDGN 7 ft Finned
length of
the coil
Finned
length of
the coil
Air
throw of
unit
MBK-MGBK 7 ft Finned
length of
the coil
Finned
length of
the coil
Air
throw of
unit
* Recommended
C
A
Airow Airow
Airow
Airow
Airow
AF
AFAF
AF AF
AF
4 or more - unit
arrangement
AF AF AF
Airow
Airow Airow
Airow
B B
D
Airow
Airow
Figure 2a: Unit placement and airow, one unit
Figure 2b: Unit placement and airow, two units
Figure 2c: Unit placement and airow
Figure 2d: Unit placement and airow, four units
Figure 2e: Unit placement and airow
C
2 x D

610.020-IOM (NOV 19)
Page 12
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
RIGGING
AGHN/GHN/GGHN/MHF (<071 Ø)
Step 1
When shipped, units are stacked, but individually skidded.
Step 2
Separate the top unit from the lower unit.
Step 3
Remove all crating from the top and sides of the skid.
Leave the unit on the skid.
Step 4
Secure hangers to the ceiling. Remove all shipping legs
and the skid from the unit.

610.020-IOM (NOV 19)
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EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
AGHN/GHN/GGHN/MHF (071 Ø and >)
Step 1
Units shipped with heavy duty plastic wrap on the skid.
Step 2
Remove plastic wrap and support members from the unit.
Step 3
Leave the unit on the skid and place forks under the full
span of the skid.
Step 4
Secure hangers to the ceiling support rods. Remove all
shipping legs and the skid from the unit.

610.020-IOM (NOV 19)
Page 14
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
MDN
Step 1
As shipped, units are stacked, but individually skidded.
Step 2
Remove all crating from the top and sides of the skids.
Leave the units on the skids.
Step 3
Place forks under the full span of the skid.
Step 4
Secure hangers to the ceiling. Remove all shipping legs
and the skid from the unit.

610.020-IOM (NOV 19)
Page 15
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
MANP
Step 1
Units shipped with heavy duty plastic wrap on the skid.
Step 2
Use a forklift to lift the unit off the truck.
Step 3
a. Remove the plastic wrap and shipping supports.
b. If unit is foot mounted, remove the skid.
Or
If unit is ceiling hung, leave the skid in place and secure
the hangers to support rods.
d. Remove skid.
Step 4
a. Use a spreader bar when lifting the unit with a crane.
b. Use all crane lift points.
c. Ensure load is evenly balanced.
d. Rigging straps must
not exceed a 30°
angle.
e. Secure feet to steel
structure and bolt or
weld in place.
See images for guideance:
MANP, 90°
MANP - 45°
MANP, 0°

610.020-IOM (NOV 19)
Page 16
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
GBF/AGBF/GGBF
Step 1
Units shipped with heavy duty plastic wrap on the skid.
Step 2
Remove plastic wrap and support members from the unit.
Step 3
Leave the unit positioned on the skid. Place forks under
the full span of the skid.
Step 4
Secure hangers to the ceiling. Remove all shipping legs
and the skid from the unit.

610.020-IOM (NOV 19)
Page 17
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
MBK/AGBK/MGBK
Step 1
Units are shipped stacked, but individually skidded.
Step 2
Remove all crating from the top and sides of skids. Leave
units on skids.
Step 3
Place forks under the full span of the skid.
Step 4
Secure hangers to the ceiling. Remove all shipping legs
and skid from the unit.

610.020-IOM (NOV 19)
Page 18
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Maintenance
FAN MOTORS AND HEATERS
The only electrical components vulnerable to potential
malfunction are the fan motors and electrical defrost
heaters. In the event of motor or heater failure, remove
the affected motor from the unit and test separately. If
the motor or heaters continue to malfunction, it may be
necessary to replace them.
DRAIN PAN
Inspect drain pan periodically. Clean accumulated dirt
and dust with soap and warm water. If a sign of improper
drainage is apparent, check drain line pitch, drain line
heater (if applicable), and drain trap for proper operation.
Clean the unit using warm water and soap. Take special
care when cleaning the unit around the electrical areas
including motor, wiring, and junction boxes. Water could
potentially damage the electrical motor.
ROUTINE MAINTENANCE
Verify the following points when visually inspecting the
equipment:
• Screw connections are secure
• There are no leakages
• Fans operate silently
• General state of the unit such as cleanliness and corro-
sion
Cleaning the nned heat exchanger is of particular im-
portance to ensure smooth operation and long life of the
equipment.
WARNING
Before any maintenance is carried out, ALL power must
be disconnected, locked out and tagged in accordance
with the respective Lockout / Tag Out policy.
MONTHLY
Inspect coil by opening the drain pan. Clean if required.
Opening the drain pan:
1. Remove the security locks
2. Rest the drain pan on an adequate support to hold the
weight of the drain pan.
Figure 3: Drain pan
WARNING
Failure to have proper support for the drain pan could
result in serious injury or equipment damage.
Conrm defrost operation and effectiveness.
BIANNUALLY
• Conrm correct operation of all safety components.
• Clean nned surface area of the coils.
• Inspect the drain pan and clean if necessary.
• Conrm drainage from the pan is unobstructed.
• Check all strainers and replace or clean if required.
• Tighten all electrical connections.
• Check all wiring.
• Conrm motor integrity. Check and grease bearings, if
necessary.
• Check operation of all heaters (coil, pan, and drain
lines).
• Check piping insulation and repair or replace if dam-
aged.

610.020-IOM (NOV 19)
Page 19
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Table 10: Air cooler troubleshooting guide
Symptoms Possible cause Corrective action
1. Fan motors not running Main switch open Close switch
Blown fuse or fuses Replace fuse or fuses
Check for short circuits or overload
conditions
Faulty motor or motors Replace motor or motors
Unit currently in defrost mode Wait for completion of defrost cycle
2. Elevated room temperature Incorrect thermostat setting (too high) Adjust thermostat setting
Low refrigerant charge Add refrigerant
Superheat setting too high Adjust thermal/electronic expansion valve
Evaporators are undersized for room / load If design load has increased, operating
conditions might require change. Alterna-
tively, add more evaporators to the space
Coil iced up Manually defrost coil and adjust defrost
settings
High inltration load Ensure all openings in space are properly
sealed
Low refrigerant ow into evaporator Check fans / motors for correct operation
(rotation)
Check and clean strainers
Adjust hand expansion valve setting
3. Ice accumulation on ceiling
around evaporator or around
fans, motors and fan nozzles
Defrost duration too long Adjust defrost settings
Too many defrosts Decrease defrost frequency
Defective defrost timer / thermostat /
defrost relief regulating valve
Repair or replace defective components
Fan delay not set correctly Adjust setting for fan delay duration
CLEANING
WARNING
All power must be disconnected and locked out before
any cleaning. The drain pan also serves as a cover for
hazardous moving parts. Operation of unit without drain
pan constitutes a hazard.
Keep coils clean to maintain optimum performance. During
periods of high cooling demand or when dirty conditions
prevail, clean the coil more regularly. Always remove large
debris from the coil and straighten ns before cleaning.
When using a high pressure washer to clean the coil, the
spray pressure must not exceed 1,100 psig (75 bar) and
the spray head must be at least 12 in. (300 mm) away from
the nned surface area. Ensure the spray angle is no wider
than 15° and that it is directed perpendicular to the coil
face area.
CAUTION
Do not use acidic chemical coil cleaners. Do not use
alkaline chemical coil cleaners that, after mixing,
have a ph value greater than 8.5 without also using
an aluminum corrosion inhibitor in the cleaning solu-
tion. Failure to follow these instructions could result in
severe corrosion to the nned surface area. Cleaning
and sanitizing solutions must be compatible with the
materials of construction of the unit.
WARNING
Some chemical coil–cleaning compounds are caustic
and toxic. Use these substances only in accordance with
the manufacturer’s instructions. Failure to do so could
result in serious injury, death or equipment damage.
Coil cleaning and sanitizing agents are available from the
following companies, dependent on materials of construc-
tion of the air unit: Zep Inc., DuChem, Nalco, and Hydro
Balance.

610.020-IOM (NOV 19)
Page 20
EVAPORATOR AND AIR COOLER
INSTALLATION - OPERATION - MAINTENANCE
Table 10: Air cooler troubleshooting guide (continued)
4. Coil not clearing of frost during
defrost cycle
Insufcient defrost cycles in 24 hour period Increase defrost frequency
Defrost cycle too short Adjust defrost setting for increased dura-
tion
Hot gas volume insufcient Increase ow to evaporator
Hot gas temperature / pressure too low Increase hot gas temperature / pressure
Defective timer or relief regulating valve Replace timer or regulating valve
Fans continue to run when in defrost mode Adjust settings to prevent fans running
Excessive inltration load Ensure all openings in space are properly
sealed
5. Uneven coil frosting Defective heater element or elements Replace element or elements
Unit located too close to a door or opening Relocate evaporator
Refrigerant feed insufcient to properly
feed evaporator
Check and clean strainers
Adjust hand expansion valve setting
Adjust thermal expansion valve (TXV)
settings
Defrost duration too short Adjust defrost settings
TXV too small Replace with correct TXV
Fans not functioning correctly Check fans and motors for correct opera-
tion, and replace if defective
6. Ice accumulation in drain pan Defective heater element or elements Replace element or elements
Unit incorrectly pitched Check and adjust accordingly
Condensate drain line plugged Clean drain line
Defective drain line heater Replace heater
Insufcient hot gas ow to unit Increase hot gas ow to unit
Defective defrost timer / thermostat /
defrost relief regulating valve
Repair or replace defective components
7. Low airow Coil iced up See symptoms 3, 4, and 5 above
Unit mounted too close to a wall Reposition unit for unobstructed airow
VFD output too low Adjust VFD settings
Fans not functioning correctly Check fans and motors for correct opera-
tion, and replace if defective
8. Insufcient airthrow Air discharge area obstructed Remove / replace any items causing an
obstruction to the discharge air
Fit streamers on air unit
NOTICE
Ice has a much higher density than frost and requires more time to melt than the normal frost formation on a coil. Ice
can form from melted frost which is not drained from the unit during the defrost cycle. Over time this accumulation
can become signicant and can lead to other problems at the evaporator. It is essential that air coolers are regularly
inspected to ensure effective defrost performance. Manual ice removal may be required in some instances to remove
this ice accumulation.
Before any inspection involving frost or ice accumulation, the coil and all sheet metal components must be thoroughly
cleaned of all ice accumulation.