Bohn MAC8X Installation Manual

MAC Series

™

Condensing Units

H-IM-67G July 2011 Part #25006401

Replaces H-IM-67G (12/03)

Installation and Operation Manual

TABLE of CONTENTS

General safety and inspection

Condensing unit specifications .........................................2

Evaporator unit specifications ...........................................3

Evaporator placement .......................................................4

Condensing Unit placement...............................................5

Refrigerant piping and line sizes ....................................6-8

Leak detection and evacuation ..........................................9

Field wiring .....................................................................10

Beacon II Controller

Installation ....................................................................11

Refrigerant line brazing
Power supply

Wiring ..........................................................................12

Box temp control settings
Refrigerant charging

Start-up operation .........................................................13

Initial power on

Operating mode display ...............................................14

Program & review settings/changes ........................15-18

Low ambient operation

Pumpdown ..............................................................19-20

Defrost ..........................................................................20

Alarms and error indicator LED ..................................21

Evaporator fans shut down by operators
Power failure
Space sensor terminal

Checking sensors .........................................................22

System defaults

Control sensor and piping ............................................23

Checking operation of exp. valve

Exp. valve motor winding resistance ........................... 24

Smart Controller ......................................................25-36

Operational checkout ...................................................37

Preventive maintenance...........................................38-40

Diagnostics .................................................................41-44

Beacon II parts lists ....................................................45-46

Startup Checklist ........................................................47-48

Wiring diagrams .........................................................49-51

Warranty information ...................................................... 52

General Safety Information

General Safety Information

1. Installation and maintenance to be performed only
by certified personnel who are familiar with this
type of equipment.

2. Make sure that all field wiring conforms to the
requirements of the equipment and all applicable
national and local codes.

WARNING: Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

Failure to follow this warning may result in personal injury or death.

3. Avoid contact with sharp edges and coil surfaces,
they are a potential injury hazard.

4. Make sure all power sources are disconnected
before any service work is done on units.

Inspection

Responsibility should be assigned to a dependable
individual at the job site to receive material. Each shipment
should be carefully checked against the bill of lading.
The shipping receipt should not be signed until all items
listed on the bill of lading have been accounted for. Check
carefully for concealed damage. Any shortage or damages
should be reported to the delivering carrier. Damaged

material becomes the delivering carrier’s responsibility and
should not be returned to the manufacturer unless prior
approval is given to do so. When uncrating, care should
be taken to prevent damage. Heavy equipment should be
left on its shipping base until it has been moved to the final
location.

Condensing Unit Specifications

Figure 1.

Table 1. Condensing Unit Specifications

Receiver
Model Location Compressor Voltage HP Unit Unit Unit 90% full
MCA MOP kW lbs.
Freezer ZF15K4E 208-230/3/60 3 1/2 22.0

MAC5X

Cooler RST43C1E 208-230/1/60 1/2 9.0
Freezer ZF13K4E 208-230/3/60 3 22.0

MAC7X

Cooler CS10K6E 208-230/1/60 1 1/2 9.0
Freezer ZF15K4E 208-230/3/60 3 1/2 22.0

MAC8X

Cooler CS10K6E 208-230/1/60 1 1/2 9.0

MCA = Minimum Circuit Ampacity MOP = Maximum Overcurrent Protection
Note: Remote circuits internal volume = .10 cu. ft. Approximate unit weight = 825 lbs.

36.2 50.0 6.4

33.8 45.0 6.4

41.0 50.0 6.5

2

Evaporator Unit Specifications

Table 2. Evaporator Unit Specifications

Evaporator Model Location Cap. No. of Dimensions (in.) Connections (In. Amps Weight

BTUH Fans A B Suct. ID Liq. OD Mtrs. Htrs. (lbs.)

MAC5X ADT052BEB2N6MK Cooler 5,200 1 29.50 17.25 5/8 1/2 0.5 — 31
LET160BEB2N6MK Freezer 16,000 4 77.50 65.25 1 1/8 1/2 2.0 15.7 81
MAC7X ADT104BEB2N6MK Cooler 10,400 2 45.50 33.25 7/8 1/2 1.0 — 49
LET120BEB2N6MK Freezer 12,000 3 61.50 49.25 7/8 1/2 1.5 11.7 60
MAC8X ADT104BEB2N6MK Cooler 10,400 2 45.50 33.25 7/8 1/2 1.0 — 49
LET160BEB2N6MK Freezer 16,000 4 77.50 65.25 1 1/8 1/2 2.0 15.7 81

Figure 2.

© 2011 Heatcraft Refrigeration Products LLC

3

Evaporator Placement

Figure 3. Evaporator Placement In Cooler/Freezer

Loading Door

1

Freezer

Note: Whenever possible always try to position the evaporator to blow towards the walk-in door. Never position the

evaporator over or adjacent to a door opening.

1

Cooler

Loading Door

or

Freezer

1

Cooler

1

Evaporator Minimum Unit Clearance

1 1/2 H

Top View

1 1/2 H

1 1/2 H

Side View

1 1/2 H

H = Total Height of Unit’s Coil Surface

1/2 W 1/2 W

H

W

2 H

4

Condensing Unit Placement

Space and Location Requirements

The most important consideration which must be taken
into account when deciding upon the location of air­cooled equipment is the provision for a supply of ambi­ent air to the condenser, and removal of heated air from
the condensing unit or remote condenser area. Where
this essential requirement is not adhered to, it will result
in higher head pressures, which cause poor operation and
potential failure of equipment. Units must not be located
in the vicinity of steam, hot air or fume exhausts. Cor­rosive atmospheres require custom designed condensers.

Another consideration which must be taken is that the

Figure 4.

(minimum)

Clearance =

3 Feet from

Building

Wall



unit should be mounted away from noise sensitive spaces
and must have adequate support to avoid vibration and
noise transmission into the building. Units should be
mounted over corridors, utility areas, rest rooms and other
auxiliary areas where high levels of sound are not an
important factor. Sound and structural consultants should
be retained for recommendations.
(Refer to actual building plans for unit locations.)



3 Feet





an Open Block

Wall or Shrubs.

3 Feet

(minimum)

Clearance to



3 Feet

(minimum)
Clearance for
Contractor to

Service Unit.

5

Refrigeration Piping And Line Sizing

Refrigeration Piping And Line Sizing

The system as supplied by Bohn/Heatcraft, was thoroughly
cleaned and dehydrated at the factory. Foreign matter may enter
the system by way of the evaporator to condensing unit piping.
Therefore, care must be used during installation of the piping
to prevent entrance of foreign matter. Install all refrigeration
system components in accordance with applicable local and

The following procedures should be followed:

(a) Do not leave dehydrated compressors or filter-driers
on condensing units open to the atmosphere any
longer than is absolutely necessary.

(b) Use only refrigeration grade (ACR) copper tubing,
properly sealed against contamination.

(c) Suction lines should slope 1/4” per 10 feet
towards the compressor (in direction of flow).

(d) Suitable P-type oil traps should be located at the
base of each suction riser to enhance oil return to
the compressor.

(e) For desired method of superheat measurement, a
pressure tap should be installed in each evaporator
suction line in the proximity of the expansion valve
bulb.

(f) When brazing refrigerant lines, an inert gas should
be passed through the line at low pressure to pre­ vent scaling and oxidation inside the tubing. Dry
nitrogen is preferred.

(g) Use only a suitable silver solder alloy on suction and
liquid lines.

national codes and in conformance with good practice required
for the proper operation of the system. The interconnecting pipe
size is not necessarily the same size as the stub-out on the con­densing unit or the evaporator.

(h) Limit the soldering paste of flux to the minimum re­ quired to prevent contamination of the solder joint

internally. Flux only the male portion of the connection,
never the female. After brazing, remove excess flux.

(i) Remove temperature sensor attached to suction
line on Beacon II systems before brazing of the
solder joint internally. Flux only the male portion of
the connection – never the female. After brazing,
remove excess flux.

(j) Wrap expansion valves with wet rags during brazing to
the liquid line.

CAUTION: If the temperature gets too high, these components
may be damaged. Heat absorbing compounds or wet rags must
be used to protect the expansion valve when brazing to the
refrigerant piping/line connections, and the suction line sensor
must be removed per above instructions.

(k) Do not use “bull head” tees. This will cause oil return
problems and can cause poor performance.

(l) If isolation valves are installed at the evaporator,
full port ball valves should be used.

Table 3. Recommended Line Size In Equivalent Lengths

Model Room Max. Max. Suction Line Liquid Line
Riser 25’ 50’ Plus 50’ 25’ 50’ Plus 50’

Freezer 1 1/8” 7/8” 1 1/8” Consult Factory 3/8” 3/8” Consult Factory

MAC5X

Cooler 5/8” 5/8” 5/8” Consult Factory 3/8” 3/8” Consult Factory
Freezer 7/8” 7/8” 7/8” Consult Factory 3/8” 3/8” Consult Factory

MAC7X

Cooler 7/8” 7/8” 7/8” Consult Factory 3/8” 3/8” Consult Factory
Freezer 1 1/8” 7/8” 1 1/8” Consult Factory 3/8” 3/8” Consult Factory

MAC8X

Cooler 7/8” 7/8” 7/8” Consult Factory 3/8” 3/8” Consult Factory

Remote Precharged Circuits

The remote precharged circuits are provided with a factory
holding charge of R-404A. The system charge is located in
the appropriate drink and ice machines. Schrader valve fittings
are provided for liquid line charging at the condensing unit.

Consult the appropriate drink and ice machine manufacturers for
details on installation of precharged lines.

6

Refrigeration Piping

Suction Lines

Note: If the suction line must rise to the point higher
than the suction connection on the evaporator, a suction
line trap at the outlet of the evaporator must be provided.

Horizontal suction lines should slope away from the
evaporator toward the compressor at the rate of 1/4” per
10 feet for good oil return.

Suction lines that are outside of refrigerated space must
be insulated. See “Line Insulation” for more information.

Suction Line Risers

Note: To provide proper oil return, a suction trap must
be provided at the base of all suction risers.

Prefabricated wrought copper traps are available, or
a trap can be made by using two street ells and one
regular ell. The suction trap must be the same size as
the suction line. For long vertical risers, additional traps
may be necessary. Generally, one trap is recommended
for each length of pipe (approximately 20 feet) to insure
proper oil movement. See Figure 5 below for methods of
constructing proper suction line P-traps.

Condensate Drain Lines

Copper drain lines should be used and properly protected
from freezing. In running drain lines, provide a minimum
of 1/4 inch per foot pitch for proper drainage. Drain lines
should be at least as large as the evaporator drain connec­tion. All plumbing connections should be made in ac­cordance with local plumbing codes. All condensate drain
lines must be trapped, and run to an open drain. They must
never be connected directly to the sewer systems. Traps in
the drain line must be located in a warm ambient. See Fig­ure 6. We recommend a trap on all evaporators. Traps lo­cated outside, or extensive outside runs of drain line must
be wrapped with a drain line heater. The heater should be
connected so that it is continuously on. The drain line must
be insulated to prevent heat loss. A heat input of 20 watts
per lineal foot of drain line for 0ºF (-18°C) room applica­tions and 30 watts per lineal foot for -20°F (-29°C) rooms
is satisfactory. Inspect the drain pan periodically to insure
free drainage of condensate. If the drain pan contains
standing water, check for proper installation. The drain pan
should be cleaned regularly with warm soapy water.

WARNING: All power must be disconnected before
cleaning. The drain pan also serves as cover for hazardous
moving parts. Operation of unit without drain pan consti­tutes a hazard.

Figure 5. Suction P-traps

Figure 6. Drain Line

Note: Always trap drain lines individually to prevent
vapor migration.

7

Refrigeration Piping

Figure 7. Example of Pipe Support

1. See Figure 7.

2. When changing directions in a run of tubing, no
corner should be left unsupported. Supports should
be placed a maximum of 2 feet in each direction
from the corner.

3. Piping attached to a vibrating object (such as a
compressor or compressor base) must be supported in
such a manner that will not restrict the movement of
the vibrating object. Rigid mounting will fatigue the
copper tubing.

4. Do not use short radius ells. Short radius elbows
have points of excessive stress concentration and are
subject to breakage at these points.

5. Thoroughly inspect all piping after the equipment is
in operation and add supports wherever line vibration
is significantly greater than most of the other piping.
Extra supports are relatively inexpensive as compared
to refrigerant loss.

Line Insulation

After the final leak test, refrigerant lines exposed to high
or low ambient conditions should be insulated to reduce
heat loss or gain and prevent the formation of flash gas in
the liquid lines. Suction lines must be insulated with 3/4”
wall Armstrong “Armaflex” or equivalent. Liquid lines

must be insulated with 1/2-inch wall insulation or better.
The insulation located in outdoor environments should be
protected from UV exposure to prevent deterioration of
insulating value.

8

Leak Detection And Evacuation

Leak Detection

After all lines are connected, the entire system must be
leak tested. The complete system should be pressurized
to not more than 150 psig with refrigerant and dry
nitrogen. The use of an electronic type of leak detector
is highly recommended because of its greater sensitivity
to small leaks. As a further check, it is recommended
that this pressure be held for a minimum of 12 hours and
then rechecked. For a satisfactory installation, the system
must be leak tight.

Within the last several years, manufacturers have
developed fluorescent dye leak detection systems for
use with refrigerants. These dyes mix with the lubricant
and, when exposed to an ultraviolet light “fluoresce,”
indicate the location of leaks. Copeland has tested and
approved the Rigid “System Safe” dye and found it to be
compatible with the compressor materials in systems.

Evacuation

CAUTION: Do not use the refrigeration compressor
to evacuate the system. Do not start the compressor
while it is in a vacuum.

A shut-off valve between the gauge connection and
vacuum pump should be provided to allow the system
pressure to be checked after evacuation. Do not turn off
vacuum pump when connected to an evacuated system
before closing shut-off valve.

The vacuum pump should be operated until a pressure of
1,500 microns absolute pressure is reached – at which time
the vacuum should be broken with the refrigerant to be
used in the system through a drier until the system pressure
rises above “0” psig.

Note: Refrigerant used during evacuation can not be
vented. Reclaim all used refrigerant. EPA regulations are
constantly being updated. Ensure your procedures follow
correct regulations.

Repeat this operation a second time.

Open the compressor’s service valves and evacuate the
entire system to 500 microns absolute pressure.

Raise the pressure to 2 psig with the refrigerant and
remove the vacuum pump.

It is of the utmost importance that proper system
evacuation and leak detection procedures be employed.
Copeland recommends a minimum evacuation to 500
microns. In addition, a vacuum decay test is strongly
recommended to assure there is not a large pressure
differential between the system and vacuum pump. Good
evacuation processes include frequent vacuum pump oil
changes and large diameter, short hose connections to
both high and low sides of the system preferably using
bronze braided hose.

A good, deep vacuum pump should be connected to both
the low and high side evacuation valves with copper
tube or high vacuum hoses (1/4” ID minimum). If the
compressor has service valves, they should remain
closed. A deep vacuum gauge capable of registering
pressure in microns should be attached to the system for
pressure readings.

9

Field Wiring

WARNING: All wiring must be done in accordance with applicable codes and local ordinances.

The field wiring should enter the areas as provided on the
unit. The wiring diagram for each unit is located on the
inside of the electrical panel door. All field wiring should
be done in a professional manner and in accordance with all
governing codes. Before operating the unit, double check all
wiring connections, including the factory terminals. Factory
connections can vibrate loose during shipment.

1. The nameplate on the unit is marked with the electrical

Figure 9. Beacon II Board

Defrost

Heater

Relay

Evaporator

Fan

Relay

EXV

Test Pins

characteristic for wiring the unit.

2. Consult the wiring diagram in the unit cooler and in the

condensing unit for proper connections.

3. Wire type should be of copper conductor only and of
the proper size to handle the connected load.

4. The unit must be grounded.

Alarm

Contacts

Expansion

Valve

Connection

LED

Display

Spare

Temperature

Room

Temperature

Defrost

Temperature

Suction

Temperature

Suction

Pressure

Selection

Buttons

Terminal

Block

10

Beacon II Controller

Installation Tips

Use a minimum 18 gauge wire for all low voltage
connections.

• The Beacon II board get its 24 VAC power supply
from a transformer mounted in the electrical end
of each evaporator. On 208-240 volt systems the
multi-tap transformer is shipped from our factory
wired for 240 volts. If your supply voltage is 208
volt you must change to the 208 volt tap on the
transformer.

• Refer to wiring schematic shipped on units for
wiring.

• Evaporators are shipped from our factory with
a preset box setpoint temperature of 35°F for
air defrost and -10°F for electric defrost. If your
box setpoint temperature requirements are different
this must be set using directions outlined
under “Room Temperature Control”.

• The suction line temperature sensor MUST be
removed from the suction line before brazing the
suction tubing. The sensor MUST then be reinstalled
on the suction line after brazing is completed and the
tubing has cooled. Insulate when finished.

• The low pressure switch time delay relay, located
in the condensing unit, must be set to 1 minute.

• Some systems may require the crankcase heater
to be energized 24 hours prior to start-up. The
Beacon II should be de-energized for this period
by placing it in the SERVICE MODE. This is done
by pressing the “FORCE SERVICE” button twice.
To start the system cooling, press the “CLEAR”
button.

• Room sensors must be left connected on ALL
evaporators.

Condensing Unit

The condensing unit control panel contains the relays,
contactors, and a terminal block which is appropriately
marked to match the low voltage wiring connections.
A sensor for outdoor air temperature measurement is
installed on the condensing unit.

Condensing unit must be installed using proper
refrigeration practices and codes. Make sure there is good
airflow and good clearances around unit. See Figure 4,
page 5.

Evaporator Unit

The evaporator contains the BEACON II controller(s),
electric expansion valve(s), pressure transducer,
distributor(s), orifice(s), transformer and three sensors.
These components are all factory mounted and wired. The
three sensors are factory mounted and provide input to the
controller from the following: defrost temp., suction temp.,
room temp.

Each evaporator unit must be installed using proper
refrigeration practices and codes. Make sure the piping is
correctly sized and properly routed. Liquid and suction
lines MUST be insulated. There must also be good
clearance around the unit.
See Figure 3, page 4.

• A pressure transducer is installed on the
evaporator. Do not leak test system above 150
PSI or damage to transducer could occur.

• Refer to the Beacon II Smart Controller
Installation Manual, shipped with the Beacon II
Smart Controller, for installation, programming
and monitoring information.

11

Beacon II Controller

Refrigerant Line Brazing (CAUTION)

The electric expansion valve and the suction temperature
sensor on the suction line are factory installed. Care must
be taken when brazing these lines at the evaporator.

Too high a temperature may destroy these components.
Heat absorbing compounds or “wet rags” must be used
when brazing the refrigerant line connections. The
suction line sensor should be removed before brazing.

Power Supply

The Beacon II board gets its 24 VAC power supply
from a transformer mounted in the electrical end of
each evaporator. On 208-240 volt systems, the multi-tap
transformer is shipped from our factory wired for 240
volts. If your supply voltage is 208 volt, you must change
to the 208 volt tap on the transformer.

VERY IMPORTANT: If the supply voltage to
the evaporator is 208 volts, the primary tap of the
transformer must be moved to the 208 volt tap.

This must be done for all the evaporators on that system.

If the 24 VAC power supply falls below 18 VAC, the
system may power down and shut off. When the power
supply is corrected to 24 VAC, the system will restart
after the four minute hold-off period and resume normal
operation.

Wiring

Wiring between the condensing unit and the unit
cooler(s) will be as follows
(see attached wiring diagrams):

• High voltage – There may be high voltage
on the defrost heater relay and the fan
relay. See unit cooler spec. plate for
ampacity.

• Low voltage – 24V Class II control circuit. A
total of five low voltage leads are required to
connect the condensing unit to the evaporator
(see wiring diagram). Two of these leads are for
connecting the outdoor temperature sensor. The
other three leads are for connecting the
compressor relay, service relay and 24V
Common inputs.

All 24 volt wiring must be run separate from the line
voltage wiring.

• Number of wires in low voltage wiring
bundles:

MAC to cooler evaporator - 5
MAC to freezer evaporator - 5

Cooler evaporator to Smart Controller - 6
Freezer evaporator to Smart Controller - 4

• Low voltage wiring must be 18 gauge
minimum. For low voltage wiring, maximum
distances are:

Condensing unit to evaporator 500 ft.
Smart Controller to evaporator 1,000 ft.

• Alarm circuit – The onboard alarm (120vac2a)
is a dry set of NC contacts which closes to
indicate an alarm. The type and wiring for the
alarm is customer specified. Note that the alarm
circuit does not distinguish or indicate what has
caused the alarm.

• All wiring must comply with all applicable
codes and ordinances.

MAC5X MAC7X MAC8X

Note: All four corner brass spacers on the Beacon II board
should have sheet metal screws and they all should be
screwed in. By doing this, the board will have a ground
reference. Make sure the evaproator is grounded.

12

Beacon II Controller

Box Temperature Control Settings

• There is an on board room thermostat on the
Beacon II board which can be adjusted to the
desired room temperature. The temperature
differential is 2°F.

Temperature Differential

When a system is in the cooling mode and
the box setpoint is 35°F, the system will
continue to cool until the box temperature
gets to 34°F. At this point the compressor
will pumpdown and shut off. The system will
restart cooling when the box temperature has
risen to 36°F.

It is important to note that Beacon II has
a minimum 2-minute “ON” time and a

Refrigerant Charging

minimum 4-minute “OFF” time. This means
that the system will run in the cooling mode
a minimum of 2 minutes even if the setpoint
temperature is met. In applications where the
system is grossly oversized, the box tem­ perature could go below the differential tem­ perature before the system cycles off.

In the “OFF” cycle, the system will be off for a
minimum of 4 minutes even if the box tempera­ ture goes above the differential temperature
before cooling will be restarted.

• The on board room thermostat is factory set
at 35°F for air defrost systems and -10°F for
electric defrost systems.

The cooler and freezer systems utilize refrigerant side
head pressure control. Charge each system by adding
an initial charge of 5 lbs. of R-404a refrigerant to the
liquid side of the receiver. This initial charge will allow
the system to start. With the system running, continue to
add refrigerant to the system until the sight glass is clear.

Operate system until the cooler/freezer box achieves the
desired temperature. The sight glass should be clear with
no bubbles or flashing of refrigerant. Now the additional
charge for the flooded condenser is to be weighed into
each system in the amount as shown in Table 4.

Table 4.

Ambient Freezer Cooler Freezer Cooler Freezer Cooler
°F. ZF15 RST43 ZF13 CS10 ZF15 CS10
80 6.0 4.0 3.0 4.0 6.0 4.0
70 5.0 3.0 2.0 3.0 5.0 3.0
60 3.0 3.0 1.0 3.0 3.0 3.0
50 2.0 2.0 1.0 2.0 2.0 2.0

40 1.0 1.0 1.0 1.0 1.0 1.0
30 1.0 1.0 0.5 1.0 1.0 1.0

20 0.5 0.5 0.5 0.5 0.5 0.5
10 0.5 0.5 0.5 0.5 0.5 0.5
0 0.5 0.5 0.5 0.5 0.5 0.5

Start-Up Operation

• Check all wiring connections to be sure they

are correct and tight.

• On condensing unit:

- Check the setting of Time Delay relay.
It should be set a one minute (the
second marker).

- Check the Low Pressure switch
setting on freezer units. It must be set to

0 PSIG cutout, 10 PSIG cut-in to allow
positive start and operation, especially in
cold ambients. This can be changed to
a higher value in warmer climates.
On cooler units, the Low Pressure switch
has a fixed setting and cannot be adjusted.

13

Beacon II Controller

Initial Power On

At the initial application of power to the system, the
compressor and the evaporator fans will be in a 4 minute
hold-off cycle and will not start immediately. When
there is a call for COOLING, the expansion valve (EEV)
opens, then the compressor is started. The compressor
will then run for a minimum of 2 minutes in the “hold­on” cycle. (This means that the compressor will run for a
minimum of 2 minutes before shutting off even if the box
temperature is met).

The LED alternately displays BOX TEMPERATURE
and MODE of operation. On a call for cooling, dLY will
show while the expansion valve is opening. After the
compressor starts, the LED will alternately display BOX
TEMPERATURE and Coo.

When the room thermostat setting is satisfied, and if

the compressor ran for at least 2 minutes, the EEV will
close and the compressor will pumpdown and shut off.
The evaporator fans will continue to run. The LED will
alternately display oFF and BOX TEMPERATURE.

When the room sensor detects a rise in temperature of
approximately 2°F, and the compressor has been off for
at least 4 minutes, the EEV will open to its last position
then the compressor will start. The valve is then adjusted
as necessary to obtain the setpoint superheat setting.
During this time, the compressor will run for a minimum 2
minutes “hold-on” cycle.

The 4 minute “hold-off” can be bypassed and the system
started immediately by pressing the “Reset” button on the
Beacon II board.

Figure 10. Operating Mode Display

oFF – Off
Coo – Cooling
Pdn – Pumpdown
dEF – Defrost
drn – Draining
dLY – Delay
tSt – Test
SEr – Service

14

Beacon II Controller

Programming And Reviewing
Settings/Changes

The Program Review button is used to program, review
and change all program settings for the system.

1) Press “PROGRAM REVIEW” button. The Setpoint
item will appear on the LED. After a few seconds delay
the Setpoint value will display. Each time the button is
pressed a different setpoint item is displayed.

PROGRAM

REVIEW

Note: If Smart Controller is in use, do not
program the board-- go to pg. 31 to program
Smart Controller.

“PROGRAM REVIEW” ITEMS

A-E – Set Defrost Type
(Air or ELE)

rEF – Set Refrigerant Type
(R22, R404A or R507)

bot – Set Box Temperature
(-30°F to +70°F)

SUP – Set Superheat
(4°F to 20°F)

2) Next, use the “SELECT” knob to change value of
Setpoint Item.

SELECT

3) Next, when the desired value is selected, press the
“ENTER” button to place it in program memory. If the
“ENTER” button is not pressed, the value will not be
stored in the memory and thus will not be changed.

ENTER

SLA – Set Board as a Slave
(Yes or No)

dFn – Set Number of Defrosts Per Day
(1, 2, 3, 4, 5, 6, 8, 10 or 12 per day)

dFF – Set Defrost Fail-safe Time
(10 to 200 minutes)

dFt – Set Defrost End Temperature
(40°F to 100°F)

dFS – Set Defrost Delay Start Time
(0.5 Hours to 23.5 Hours)

ALH – Set Alarm High Temperature
(-40°F to 90°F)

ALL – Set Alarm Low Temperature
(-40°F to 90°F)

– Set Alarm Time

ALt

(2 to 120 minutes)

F-C

– Set Fahrenheit/Celsius

Temperature Units (°F / °C)

15

Beacon II Controller

Programming And Reviewing Settings/Changes (continued)

Use the “PROGRAM REVIEW” button to select these items:

PROGRAM

• Defrost Type – “A-E” – Selection is made
for air defrost or electric defrost coil. This will
automatically set the system factory defaults
for air defrost and electric defrost. (See default
settings). Please note that the refrigerant type
default for air defrost is R22 and for electric
defrost it is R404A. All units are shipped with
factory default settings.

• Refrigerant Type – “rEF” – Selection for type of
refrigerant – R22, R404A or R507.

Default: Air defrost is R22 and for electric
defrost is R404A.

• Box Temperature – “bot” – Select box
temperature setpoint. Selection range is -30°F
to +70°F.

Default: Electric defrost -10°F and air
defrost +35°F.

• Superheat – “SUP” – Evaporator superheat
is controlled by the board on each evaporator.
Each board measures the evaporator saturation
suction temperature and the suction pressure
to determine the superheat. The superheat
value at the evaporator can be changed to
ensure a 20°F to 30°F superheat at the
compressor.

Default: 8°F.

Default: MASTER on each board. For a
single evaporator system, no change is
required.

• Number of Defrosts Per Day – “dFn” – A
selection must be made for the number of
defrosts cycles per day – 1, 2, 3, 4, 5, 6, 8, 10
or 12 per day. If no selection is made:

Default: Electric defrost is 4 per day and air
defrost is 2 per day.

• Defrost fail-safe – “dFF” – This is the maximum
time allowed for a coil to remain in defrost.
Defrost will be terminated if the defrost end
temperature is not attained when this time has
expired.

Default: Electric defrost is 30 minutes and air
defrost is 40 minutes.

• Defrost End Temperature – “dFt” – This is the
temperature at which the defrost will be
terminated.

Default: Electric defrost is +60°F and air
defrost is +45°F.

• Defrost Delay Start Time – “dFS” – This allows
the delay of the start of the defrost.

Default: 0.5 hours to 23.5 hours.

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