Blood Plasma Freezer
With Master Controller
For Model BCLZR10AC
Installation & Operations Manual
An Electronic Microprocessor-Based
Electric Expansion Valve Refrigeration Control System
Featuring Reverse Cycle Defrost
IMPORTANT NOTICES
• Read this manual before installing your Master Controller system. Keep the
manual and refer to it before doing any service on the equipment. Failure to do
so may result in personal injury or waive warranty of damaged equipment.
• Modifications to existing equipment are subject to approval by Master-Bilt and
must be explicitly written. There are no implied flexibilities designed into this
product.
• The following points apply unless overwritten and approved by the Master-Bilt
engineering department:
o Maximum distance of wires between the evaporator and the Master
Controller MUST not exceed 40 FT.
o The Master Controller MUST be mounted in close proximity to the
vestibule entrance door.
o All control wiring (i.e. sensor wires, pressure transducer wires, and
Electronic Expansion Valve) must be in separate conduit from the power
supply. Blood Plasma Room Only.
• Due to continuous product enhancements, Master-Bilt reserves the right to
make engineering changes and change specifications for product
improvement without notice.
2
INTRODUCTION ..................................................................................................................4
WARNING LABELS AND SAFETY INSTRUCT IONS ..........................................................5
APPLICATIONS....................................................................................................................5
MASTER CONTROLLER .....................................................................................................6
Description.................................................................................................................6
Factory-Mounted Parts...............................................................................................9
Features.....................................................................................................................9
Sequences of Operation..........................................................................................10
START UP.........................................................................................................10
OFF MODE ........................................................................................................10
COOL MODE......................................................................................................10
DEFROST MODE.................................................................................................11
Scheduled Defrost .....................................................................................11
Manual Defrost .........................................................................................11
COIL DRAIN MODE ..............................................................................................11
FAN DELAY MODE...............................................................................................12
SAFETY MODE...................................................................................................12
Definition of On-Board Symbols...............................................................................13
STATUS, DEFAULT AND READING DISPLAY...............................................................13
Typical Set Points for Blood Plasma Control Board.................................................14
Alarm Display...........................................................................................................15
Setting Parameters by On-Board Pushbuttons........................................................15
Temperature Sensors ..............................................................................................16
SENSOR SERVICE INSTRUCTIONS ........................................................................16
Pressure Transducer ..............................................................................................17
Charging the Master Controller Refrigeration System..............................................18
Technical Notes.......................................................................................................18
Electrical Wiring ................................................19
TYPICAL WIRING DIAGRAMS .................................................................................20
Line Sizing and Insulation…………………………………………………………………22
Start-Up Checklist………………………………………………………………………….22
REVERSE CYCLE DEFROST ...........................................................................................23
General Information .................................................................................................23
Advantages..............................................................................................................23
Factory-Installed Parts.............................................................................................23
Eliminated Parts.......................................................................................................24
Defrost Time ............................................................................................................24
Charging a Master Controller System Equipped with Reverse Cycle Defrost..........24
TROUBLESHOOTING GUIDE ...........................................................................................25
Troubleshooting Electric Expansion Valve
..............................................................26
MASTER-BILT PART NUMBERS.......................................................................................26
3
INTRODUCTION
Thank you for purchasing a Master-Bilt Master Controller electric expansion valve refrigeration system. This
manual contains important instructions for installing, using and servicing the system as well as a parts list.
Read this manual carefully before installing or servicing your equipment.
DANGER
Improper or faulty hook-up of electrical components of the refrigeration units can result in severe
injury or death.
All electrical wiring hook-ups must be done in accordance with all applicable local, regional or national
standards.
NOTICE
Installation and service of the refrigeration and electrical components must be performed by a
refrigeration mechanic and/or a licensed electrician.
The portions of this manual covering refrigeration and electrical components contain technical instructions
intended only for persons qualified to perform refrigeration and electrical work.
This manual cannot cover every installation, use or service situation. If you need additional information, call or
write us:
Customer Service Department
Master-Bilt Products
Highway 15 North
New Albany, MS 38652
Phone: 800-684-8988
Fax: 800- 684-8988
Email: service@master-bilt.com
4
WARNING LABELS AND SAFETY INSTRUCTIONS
This is the safety-alert symbol. When you see this symbol, be alert to the potential for personal
injury or damage to your equipment. Be sure you understand all safety messages and always
follow recommended precautions and safe operating practices.
NOTICE TO EMPLOYERS
You must make sure that everyone who installs, uses or services your refrigeration is thoroughly
familiar with all safety information and procedures.
Important safety information is presented in this section and throughout the manual. The following signal words
are used in the warnings and safety messages:
DANGER: Severe injury or death will
WARNING: Severe injury or death can
CAUTION: Minor injury or damage to your refrigeration system can occur if you ignore the message.
NOTICE: This is important installation, operation or service information. If you ignore the message, you
may damage your refrigeration system.
The warning and safety labels shown throughout this manual are placed on your Master-Bilt
refrigeration system at the factory. Follow all warning label instructions. If any warning or safety labels
become lost or damaged, call our customer service department at 800-684-8988 for replacements.
occur if you ignore the message.
occur if you ignore the message.
This label is located on the cover of a Master Controller.
APPLICATIONS
Master Controller electric expansion valve systems are designed to control Master-Bilt made condensing units
and evaporators for freezer and cooler applications. Each system contains a condensing unit, evaporator(s)
with Master Controller board(s), electric expansion valve(s), pressure transducers, temperature sensors and
operational controls.
5
MASTER CONTROLLER
Description
The Master Controller is a custom-designed microprocessor-based electronic controller for Master-Bilt
refrigeration products to control an electric expansion valve in response to evaporator superheat and return air
temperature. The hardware and input/output descriptions and connections of a Master controller are shown
below on Figure 1.
Figure 1 . Master Controller
6
• SEI or SER Terminals. Sporlan SEI and SER type electric expansion valves are curr ently used for all
applications. There are 1596 nominal steps for entire valve stroke.
• Off Mode Switch is a digital input ‘DI2’. Shorting of pins tells controller to shut everything off for 45
minutes. The defrost heaters, evaporator fans, and output to control the relay for the compressor are
turned off. The valve is also shut. An open between the pins of ‘DI2’ tells the controller to run in normal
operation. “FF” will appear on the two digeit LED display when the Off Mode is initiated.
• Suction Pressure Transducer is mounted at the evaporator suction header to measure saturated
suction pressure in absolute value but dis played in gauge pressure in PSIG. The suction pressure is
converted to evaporating temperature. The difference between outlet temperature and evaporating
temperature is the superheat displayed as “SH”.
• High Pressure Transducer is mounted on the condenser and used to monitor both high pressure
during cool mode and suction pressure during defrost.
• Defrost Termination Temperature Sensor TS1 is mounted downstream of the distributor tube after
the valve and close enough to the evaporator coil to m easure defrost term ination temperature during
defrost cylce. Figure 2 on the next page shows the sensor locations of the evaporator and the
controller.
• Outlet/Fan Cut-In T emperature Sensor TS2 is m ounted on the s uction line about 6” to 8” away from
the evaporator to m easure outlet temper ature during c ooling cycle and to serve as evaporator fan c utin temperature s ensor . The sensor is at a 2 or 10 o’cloc k position on the suction line. The default value
of the fan cut-in temper ature (FS or FDSP) is pre-set at -20
o
F for Blood Plasma Stor age Applications.
This value may be adjusted depending on respective situations.
• Room Temperature Sensor TS3 is mounted at the drain pan on the air intake side of the evaporator.
It is located around the center of the evaporator to allow even air f low across it. If nec essar y, it may be
relocated to a spot with better representation of the cold room temperature.
• Compressor Suction Temperatu re Sensor TS4 is mounted at the suction line just pr ior to entering
the compressor. It is used to measure compressor return gas superheat.
• Two Digit LED Display is used to show status of the controller, set point values and temperatures.
• Green and Red LED Status Indicators. W hen power is applied to the controller, the green LED will
be on constantly during normal operation. The red LED is the negative sign for tem peratures showing
less than 0
0 to 99
o
F on the two digit LED display. If the red LED is off, the two digit display reading is between
o
F. If it is on, the 2 digit display reading is between –55 to –1oF. A blinking red LED indicates an
alarm has occurred.
• Two Push Buttons are used to display set points and status as well as to reset operational
parameters like room temperature, defrost mode, number of defrosts per day, etc. Once an operational
parameter has been changed for a given setpoint, no confirmation inputs are required, the Master
Controller will recognized these changes immediately. Their f unctions can also be viewed/changed by
an optional remote display panel.
• Two 20 Amp, 240 VAC NC/NO Relays. Relay ‘K1’ is used for the drain pan heater when the heater
load is less than 20 am p. It will be wired to defrost heater contactor coil when heater load is over 20
amp or three phase heaters. Relay ‘K2’ is used to switch evaporator fans ON and OFF. A fan contactor
will be used if the fan motor is lager than 10 amps or three phase or the voltage is different from control
voltage.
7
• One 5 Amp, 240 VAC NC/NO Relay is an option for an external alarm system. The customer will
decide what type of a physical alarm is used. This relay is energized when the controller is powered on.
Whenever the controller gives an alarm, the relay will be de-energized. For exam ple, a technician can
connect a phone alarm system to this relay. When there is an alarm, the alarm system can dial in his
pager or cellular phone.
• Panel Display Jack. When a rem ote display panel is used for a standalone Master Controller system,
this jack is used to connect the remote panel display with a communication cable supplied by the
factory.
• Power Input 24 VAC 40 VA. The Master Controller power input requirment is 24VAC. A factory
mounted 40VA step down transform er is pr ovided at the evaporator. Secondary voltage (24VAC) must
be connected to the control board by the refrigeration technician.
Defrost Term.
Room Temp
Sensor
Temp. Sensor
Liquid Line
Distributor
Electric
Expansion
Valve
Evap out / Fan Delay
Temp Sensor
Suction Line
Evaporator
Pressure
Transducer
MASTER CONTROLLER
Figure 2.
Optional Off
Mode Switch
Pressure
Transducer
8
Factory-Mounted Parts
• The Electronic Expansion Valve (EEV), pressure transducer, and 2 ea. 40VA transformers will be
mounted at the factory. Three temperature sensors (TS1, TS2, and TS3) are mounted but not
connected to the Master Controller.The EEV, pressure transducer, and 24 VAC supply power must
also be connected once the controller is mounted.
This should be done by the refrigeration technician.
• An external relay (12VDC Coil) is mounted at the condensing unit. When in the cooling or defrost
mode, this relay will be energized. This relay will then energize the compressor contactor.
• All components are fac tory tested. A technician should c heck all the s ettings for pr oper operation after
installation.
Features
• Free floating head pressure saves energy. The Head pressure control is not installed on Master-Bilt
Master Controller systems. Without this control, compressors work at the highest efficiency at the
lowest possible condensing pressure rather than at the limited pressure level typically found in
conventional systems using a head pressure control valve for low ambient environments
• The electric expansion valve replaces a thermal expansion valve. The refrigerant flow of the electric
expansion valve is modulated by the true superheat, or the difference of evaporator outlet and
evaporating temperatures.
• The room temperature sensor replaces the conventional temperature control. The temperature is set
with the two pushbuttons on the Master Controller board. The default temperature must be checked
during the first startup of the machine against actual application temperature. Default must be re-set to
actual application temperature if there is a discrepancy. NOTE: This is an extremely low temp
application which requires staging the pull down upon the initial start-up. This Blood Plasma
refrigeration system should be set to -10º and be left alone for 24 hours. If the high alarm setpoint (HA)
has not been reset to accommodate this higher room temp setting, a High Temp Alarm will occur (HA).
This can be cleared easily by pressing PB1 on the control board three times consecutively.
After the initial pull down, the room temperature set point may then be taken down to -30ºF and left for
12 hours after which the box temperature may be taken to -45ºF. This staging helps prevent freezer
panels from delamination.
• The on-board timer is used for run time control and scheduling defrosts. No mechanical defrost timer is
necessary for this system. Number of defrost per day may be set on the Master Controller via the
number of defrost per day (nD) parameter.
• The operational status of modes, room temperature and alarms is displayed on the two-digit on-board
display.
• Manual defrost is available on both the Ante Room and the Blood Plasma Room. A manual defrost
may be accomplished by holding PB2 down for more than 5 seconds.
• The superheat set point has a wide 2° to 20
meet different customers’ needs, and requires less refrigerant charge for winter operation than
conventional refrigeration unit when no head pressure valve is installed in the condensing unit.
• The unique, patented reverse cycle defrost option (United States Patent 7,073,344) reduces defrost
energy usage by 80% and reduces defrost time from 20-45 minutes to 5-10 minutes with a completely
clean defrost.
• Maximum operating suction pressure can be controlled by the electric expansion valve eliminating the
crankcase pressure regulator for some applications.
• Minimum operating suction pressure provides additional compressor protection.
• The off mode switch turns off the evaporator fans during loading or unloading of refrigerated items.
If the off mode swith is left closed for 45 minutes, it will then go back into its normal operating mode.
o
F adjustability range. This range allows the controller to
.
9
Sequences of Operation
START UP
When power is applied to the board, the controller closes the valve. The controller will display ‘SU’ on its twodigit display for five seconds. It will then display ‘CF’ on the two-digit display for 10 seconds. The evaporator
fans will be on for the first 15 seconds allowing a service technician time to check them. The controller will then
turn the fans off and check each sensor. The controller will check the pressure transducer for a short or open.
It will display ‘CP’ on the two-digit display for three seconds. If the sensor fails, the controller will display an
alarm and go to safety mode for a failed sensor. If the sensor passes, it will display ‘oP’ on the two-digit display
for three seconds. The controller will check the sensor connected to ‘TS1’ for a short or an open. It will display
‘C1’ on the two-digit display for three seconds. If the sensor fails, the controller will display the alarm ‘Si’ on the
two-digit display and go to safety mode for a failed inlet sensor. If the sensor passes, it will display ‘o1’ on the
two-digit display for three seconds. The controller will check the sensor connected to ‘TS2’ for a short or an
open. It will display ‘C2’ on the two-digit display for three seconds. If the sensor fails, the controller will display
the alarm ‘So’ on the two-digit display and go to safety mode for a failed outlet sensor. If the sensor passes, it
will display ‘o2’ on the two-digit display for three seconds. The controller will check the sensor connected to
‘TS3’ for a short or an open. It will display ‘C3’ on the two-digit display for three seconds. If the sensor fails, it
will display the alarm ‘SA’ on the two-digit display and go to safety mode for a failed room temperature sensor.
If the sensor passes, it will display ‘o3’ on the two-digit display for three seconds. If all sensors pass, the
controller will display ‘FH’ on the two-digit display for six seconds. When sensor fails, the alarm relay will be
de-energized.
The controller will not go into defrost during the preceding start up procedure. It will check the number of
defrosts per day (nd) and time_of_day (TIME). If it is time for the controller to be in defrost, it will start in
DEFROST (Df) mode. If not, the controller will start in COOL(CL) mode after fan delay.
The set points are stored in EEPROM (Electrically Erasable Programmable Read Only Memory). Batteries
are not required to store the new set points. If 24 VAC power is lost, the set points which were in the controller
at that time will be used when power is restored.
OFF MODE (oF)
The controller starts in OFF mode by fully closing the valve. The controller will keep the valve closed for the
minimum OFF Time (oC) in order to keep the compressor in pumpdown or off for a minimum amount of
time.When the room temperature reaches the cut-in set point (room temperature set point “rS” plus the
temperature difference set point “rP”), the controller goes to COOL mode (CL).
While the controller is in OFF mode, it is constantly checking the number of defrosts per day and the
time_of_day and calculating the time for defrost. When the time_of_day is right for a defrost, it will immediately
go into DEFROST mode right after the current OFF mode.
After the Minimum OFF Time has elapsed and the room temperature reaches the Cut-In temperature, the
controller will go into COOL mode(CL).
While in OFF MODE, the two-digit display on Master will show ‘oF’ for three seconds, ‘ro’ for two seconds,
and the numerical display of the room temperature for five seconds.
COOL MODE (CL)
The controller starts COOL mode by opening the valve. The condensing unit will start by a suction line low
pressure control cut-in. The electric expansion valve is modulated by the controller so that a preprogrammed
superheat set point (SS) is maintained during the refrigeration process. Actual superheat is the temperature
difference of the evaporator outlet and the evaporating temperature converted from the reading of the
presssure transducer, or T
superheat set point. Meanwhile, the controller reads also the room air temperature TS3. When the room
temperature is below the room temperature set point (pre-set to -40
mode.
If the suction pressure is above the maximum operating pressure set point (PS), the valve will modulate to
control the pressure at or below the maximum operating pressure set point (PS). When the operating suction
pressure is lower than PS, it will go back to superheat control. Suction pressure is used to calculate saturated
temperature (T
) via the Pressure Transducer.
sat
. The controller will keep modulating the valve so the superheat will equal the
out-Tsat
o
F for ultra low temp), it goes back to OFF
10
If the suction pressure is below the Minimum pressure set point (Pn), the valve will close and the control
signal to the external relay will be turned off. It will resume normal operation when the pressure is above the
Minimum pressure set point.
While in COOL MODE, the two-digit display on Master will show ‘CL’ for three seconds, ‘ro’ for two
seconds, and the numerical display of the room temperature for five seconds.
DEFROST MODE (dF)
The defrost mode of this controller is somewhat similar to a conventional defrost timer with one exception. This
control will termintate the defrost if one of two things happens. If the defrost termination temperature (ds) is
reached, the controller will terminate the defrost. However, if the maximum defrost duration (dU) is reached
before the termination temperature is achieved, the controller will terminate the defrost. After the defrost has
been terminated, the system will go into the coil drip mode. Coil drip mode is another adjustable parameter
featured on the Master Controller. This set point (dr) is factor set at 5 minutes. During drip mode, the reversing
valve will remain energized with 24 VAC.
Scheduled Defrost
The following is the description of the scheduled defrost.
The time_of_day is really an elapsed counter that counts the number of minutes that have passed. An elapsed
count of 0 is 12:00 AM. The count goes up to 1439 which corresponds to 11:59 PM. The counter will then reset
to 0.
The time of day will be kept as long as the 24 VAC power is connected. If the 24 VAC is turned off, then
back on, the time of day will be reset to 0 which corresponds to 12:00 AM.
The first defrost start time is an elapsed time of 0 (12:00 AM). The subsequent defrost start times are
determined by adding the number of minutes between each defrost to the previous start time until there is a
defrost start time for each defrost per day. The number of minutes between each defrost is determined by
taking 1440 / number of defrosts per day as set up by the ‘NUMBER OF DEFROSTS (nd)’ set point.
When starting a reverse cycle defrost, the K2 relay is energized to turn off the fans while, at the same time,
terminals B and W of the controller are de-energized to turn off the compressor. There is a 10 second delay
before the K1 relay is energized to switch the four-way reverse valve. Then there is a 30 second waiting period
for pressure equalizing. Afterward, terminals B and W are energized to turn the compressor on. Hot gas will be
reversed to flow to the evaporator while the electric expansion valve is modulated to start a defrost.
The controllers use the inlet sensor ‘TS1’ as the defrost termination sensor. When this temperature gets
above the preprogrammed ‘DEFROST TERMINATION TEMPERATURE SET POINT (dS)’ before the
preprogrammed ‘MAXIMUM DEFROST TIME (dU)’, the defrost will terminate. Otherwise, it will be terminated
when the ‘MAXIMUM DEFROST TIME’ elapses as metioned above.
While in DEFROST MODE, the two-digit display will be ‘dF’ for three seconds, ‘dn’ for three seconds, and the
numerical display of the temperature reading from sensor TS1 for three seconds.
Manual Defrost
The controller allows manually-initiated defrost when needed. The manual defrost will be disabled if the
evaporator inlet sensor detects the temperature higher than the defrost termination temperature. Operation of
the manual defrost will be discussed in a later section.
COIL DRAIN MODE (Cd)
The controller automatically goes into COIL DRAIN whenever a defrost is terminated. The controller stays in
this mode for the preprogrammed ‘DRIP TIME (dr)’. When this time is completed the controller opens the
expansion valve and goes into FAN DELAY mode (Fd).
While in COIL DRAIN MODE, the two-digit display on the controller will show ‘Cd’ for five seconds, ‘ro’ for
three seconds, and the numerical display of the room temperature for three seconds.
11
FAN DELAY MODE (Fd)
The controller will pull down the temperature of the evaporator without the fans on until one of the following
occurs: The fan delay time (FN) of 0-59 minutes times out or the fan cut-in sensor’s temperature TS2 goes
below the fan delay temperature (FS) of -20ºF Please note this parameter (FS) has a range of -55ºF to 83ºF.
The controller will then go into COOL mode. While in FAN DELAY MODE, the two-digit display will be ‘Fd’ for
three seconds, ‘Fp’ for three seconds, and the numerical display of the temperature reading from sensor TS2
for three seconds.
SAFETY MODE
When an alarm occurs, such as a sensor failure or a communication alarm, the controller will go into ‘SAFETY
MODE’. SAFETY MODE provides minimum refrigeration to the refrigerated room before the corrective action is
taken and the alarm is cleared.
• Pressure transducer alarm (SP)
o Cool mode
Valve open for the minimum compressor run time
Valve closed for the minimum compressor off time
Keep doing above cycle until alarm goes away
Ignores maximum pressure control mode
• Outlet sensor alarm (So)
o Cool mode
Valve open for the minimum compressor run time
Close valve for the minimum compressor off time
Keep doing above cycle until alarm goes away.
o Fan delay mode
Lets fan delay time out (five minutes)
o Defrost Mode
If this alarm and defrost term temp sensor alarm, reverse cycel defrost will last only
three minutes with valve open;
• Box temp sensor alarm (SA)
o Cool Mode
Run on superheat control for the minimum compressor run time
Close valve for the minimum compressor off time
Keep doing above cycle until alarm goes away.
• Low superheat alarm (LS)
o Closes valve and wait for alarm to go away.
• High Room Temperature Alarm (rH)
The ‘high room temperature alarm’ occurs when the room temperature is above the preprogrammed
‘HIGH TEMPERATURE ALARM (HA)’ for a preprogrammed number of minutes. The alarm is cleared
when the room temperature is less than the ‘HIGH TEMPERATURE ALARM’ set point.
• Low Room Temperature Alarm (rL)
The ‘low room temperature alarm’ occurs when the room temperature is below the preprogrammed
‘LOW TEMPERATURE ALARM (LA)’ for a preprogrammed number of minutes. The alarm is cleared
when the room temperature is above the ‘LOW TEMPERATURE ALARM’ set point.
• Defrost term temp sensor alarm (Sd)
o Defrost mode
Open valve until alarm goes away or defrost terminates.
If this alarm and outlet temp sensor alarm, defrost will last only three minutes.
Use outlet sensor for defrost temperature termination
12
Definition of On-Board Symbols
STATUS, DEFAULT AND READING DISPLAY
When the on-board green light is on, the controller is in normal operation. When the green light is blinking, a
set point is being displayed or ready for change. When the red light is blinking, there is an alarm.
The status and the digital data are displayed on the onboard two-digit LED display. Below is a list of the
parameters of the operational status.
Onboard Optional
Two-Digit Panel
Display Display Description
SU STUP Indicates the status of Start Up Mode
CF CKFN Check fan working status
CP CKP1 Check pressure transducer
oP OKP1 Indicates the pressure transducer is working as it should
C1 CKT1 Check sensor TS1, the inlet/defrost termination temperature sensor
o1 OKT1 Indicates the TS1 is working as it should
C2 CKT2 Check sensor TS2, the outlet/fan cut-in temperature sensor
o2 OKT2 Indicates the TS2 is working
C3 CKT3 Check sensor TS3, the room temperature sensor
o3 OKT3 Indicates the TS3 is working
FH CKFH Indicates all sensors are OK
Fd FNDL Indicates FAN DELAY MODE
FP FDTP Actual TS2 value in FAN DELAY
CL COOL Indicates COOL MODE
oF OFF Indicates OFF MODE
dF DEFR Indicates DEFROST MODE
Cd DRIP Indicates COIL DRAIN MODE
dn DFTP Inlet sensor TS1 value in DEFROST MODE
13
A list of the parameters that can be displayed and/or changed is shown below when access to the default
settings is needed. This access is usually done by a trained technician.
The following are outputs only and may not be changed.
ro RMTP room temperature from TS3 (-60
E0 POSN percentage the valve is open (0 to 99%)
SH SUPH actual superheat in COOL MODE (TS2 – in)
CS COSH actual superheat measured at the compressor suction (TS4-in)
in TSAT evaporator saturated temperature calculated from suction pressure Pr
oU TOUT evaporator suction outlet temperature from TS2
dE DFTP temperature read from the evaporator defrost termination sensor TS1
Ct CMTP temperature read from compressor suction TS4
Pr PRES suction pressure read from the pressure transducer (-14.6 to 138.4PSIG)
dp DPRS head pressure during Cool Mode; suction pressure during Defrost Mode
in Hexadecimal Digits. Use remote display to read head pressure
o
F to +93oF)
The following are adjustable parameters.
Cn CMMD The Standalone, Alternating Mode. Standalone, Ao
nS MSGP The address group for communication ( nS=0 ), reserved for future use
SS SHSP superheat set point (5 to 30
rS RMSP room temperature set point or cut-out (-50
dU DFTM maximum defrost duration (0 to 60 minutes). (dU = 20 )
dS DFSP defrost termination temperature (35 to 90
dr DRTM drip time duration (0 to 15 minutes). (dr = 5 )
nd NMDF number of defrosts per day (1 to 12). (nd = 3)
HA HIAL high temperature alarm set point (-40 to +35
Ad ALDL temperature alarm delay (0 to 59 minutes). ( Ad = 30 )
LA LOAL low temperature alarm set point (-60
oC OFTM minimum time the valve is close (0 to 15 minutes). (oC = 2 )
rn RNTM minimum time the valve is open (0 to 15 minutes). (rn = 2 )
rP RNTP cut-in temperature differential (0 to +25
PS MPSP Maximum pressure set point (-4.6 to 55 PSIG). Default is
Pn NPSP Minimum pressure set point (-14.6 to 3 PSIG). Default is -14.6 PSI
HS DPSP Suction Pressure Set Point during defrost ( 10 to 80 PSIG). Default = 30
Ar LGAD Address of controller for remote data logging ( Ar = 00, not used here )
Fc DGCF Temps measured in Degrees C or Degrees F. Default = FA
FS FDSP Fan delay temperature set point (-55 to 30 deg F) -20
FN FDTM Maximum time to delay fans (0 – 10 Minutes) 5 min
SC CMSP Superheat setpoint at compressor suction ( 15 to 80
AL DIF2 If in alternating mode, number of deg above air set point to override and both
controllers to go into cool mode (0-25 deg F). 5
Note 1: When power is lost, the backup power is to drive the EEV completely close.
Note 2: Compressor CPR valve setting 10 to 15 PSIG.
o
F). (SS =10)
o
F not adjustable)
o
F to +30oF, Default= -45F)
o
F). (dS = 50 )
o
F). (Default= - 30F)
o
F). ( rP = 05)
3 PSI
o
F
o
F) ( Default = 50)
o
F
14
ALARM DISPLAY
Any alarm will cause relay #3 to switch. All alarms have a distinct display shown on the two-digit display on the
controller. The green LED will be on and the red LED will blink. Multiple alarms can exist. There is a priority as
to which alarm will be displayed before another.
Onboard Optional
2 Digit Panel
Display Display Description PRIORITY
NOAL Displays when there are no alarms. The onboard 2 digit display
will display status and temperature readings
SP PRSR pressure transducer 1
So SCSR evaporator outlet temperature sensor TS2 alarm 2
SA RMSR room temperature sensor TS3 alarm 3
LS LOSH low superheat alarm 4
rH HIRM high room temperature alarm 5
rL LORM low room temperature alarm 6
Sd DFSR defrost termination sensor TS1 alarm 7
CS CMSR Compressor Suction Temperature Sensor Alarm 8
dA DPSR high press transducer alarm 9
LP LPAL Low pressure alarm 10
CA CMAL communication alarm 11
Setting Parameters By On-Board Pushbuttons
When the two-digit display is a displaying a temperature or status, the green LED is always on. The red LED is
the negative sign. When the red LED is on, it indicates the temperature is below zero. When the green light is
blinking, a set point is being displayed or ready for change. When the red light is blinking; it indicates an alarm.
There are two levels for programming the controllers with the two-digit display and two pushbuttons. The
first level (User’s Level) will enable the USER to set the room temperature set point ‘rS’; the second level
(Technician’s Level) allows access to the other parameters as described above.
USER’s Level Press and hold ‘PB2’ until the display shows ‘rS’ (about five seconds). The green LED
will start blinking. The display will toggle between ‘rS’ and the numerical value of the
room temperature set point. The red LED will be off if the set point is positive or on if
the set point is negative. Press ‘PB1’ to increase the room temperature set point by
o
F. Press ‘PB2’ to decrease the room temperature set point by 1oF. The set point can
1
be changed between -40
controller will go back to normal operation. The green LED will be on constantly and
the mode will be displayed as described above.
TECHNICIAN’s Level To enter the second level of programming (able to see all temperatures and change all
Set points), press and hold ‘PB1’ and ‘PB2’ simultaneously until the display shows ‘ro’
(about five seconds). The green LED will start blinking. The display will toggle between
‘ro’ and the numerical value of the room temperature. The red LED will be off if the set
point is positive or on if the set point is negative. To scroll down the parameters
without changing them, press ‘PB2’. To increase the set point by one increment, press
‘PB1’. When that set point gets to its maximum value, pressing ‘PB1’ will rotate it to its
minimum value.
CLEAR ALARM Pressing ‘PB1’ three times within five seconds will cause the controller to clear “LS”,
“rH” and “rL” alarms and restart timer.
MANUAL DEFROST If the controller is in OFF or COOL MODE, pressing and holding pushbutton PB1 for
over five seconds will cause the controller to go into defrost cycle. If the controller is in
o
F to +80 oF. If no button is pushed for 20 seconds, the
15
PUMP DOWN MODE, pressing and holding pushbutton PB1 for over five seconds will
cause the controller to go into DEFROST MODE. If the controller is in DEFROST
MODE, pressing and holding pushbutton PB1 for over five seconds will cause the
controller to go into COIL DRAIN MODE. If the controller is in COIL DRAIN MODE,
pressing and holding pushbutton PB1 for over five seconds will cause the controller to
go into FAN DELAY MODE. If the controller is in FAN DELAY MODE, pressing and
holding pushbutton PB1 for over five seconds will cause the controller to go into COOL
MODE.
Temperature Sensors
The application range of the temperature sensors used for this controller is -50oF to +103oF. If the sensor
detects a temperature out of the range, an alarm will show on the controller display.
Four temperature sensors are used in the Master Controller refrigeration system. They are the room
temperature return air sensor, the evaporator defrost termination temperature surface sensor, the evaporator
outlet (suction line) temperature surface sensor and a Compressor Suction Return Gas Temperature sensor.
All sensors are solid state devices with the same characteristics that change electrical resistance in response
to a change in temperature.
The room temperature sensor is factory-mounted on the lower back of the
evaporator at the drain pan. This placement avoids heat from defrost heaters
and lights and still allows a good air stream over the sensor. Figure 3 shows a
typical mounting of the room temperature sensor.
The defrost termination sensor is mounted on one of the distributor tubes close
the coil end plate. The outlet sensor is mounted on the suction line at the outlet
of the evaporator as shown in Figure 4. These sensors are interchangeable.
SENSOR SERVICE INSTRUCTIONS
Care must be taken when brazing the suction line at the
evaporator. The outlet sensor must be taken out before brazing.
After brazing, fasten the sensor with the metal strap provided.
Make sure the sensor is tight and has good contact with the
suction line.
The temperature sensor cannot be repaired. Using the
measurements in Chart A below, you can determine if they are
functioning correctly. If the sensors are found out of tolerance,
they should be replaced.
As mentioned above, the temperature sensor changes
electrical resistance in response to temperature changes.
EVAP OUT
FAN DELAY
TEMP SENSOR
SUCTION LINE
PRESSURE
TRANSDUCER
Disconnect the sensor from the controller, check the temperature
at the sensor location, then check and record the resistance
6" TO 10"
through the temperature sensor.
Procedures to check temperature sensor tolerance with ice water:
1. Use a cup of water with well-stirred ice. The water temperature should be an even 32°F.
2. Submerge the room temperature sensor (TS3) into the water while the Master Controller is normally
operating. Check the display for the value. If the sensor shows 32°F, it is working properly.
3. Push PB1 and PB2 simultaneously until the green LED is blinking, scroll down the display to “in”, the
defrost termination sensor (TS1) value. Submerge the sensor into the water. Check the display for the
value. If the sensor shows 32°F, it is working properly.
4. Scroll down the display to “oU”, the outlet sensor (TS2) value.
5. Submerge the outlet sensor into the water. Check the display for the value. Again, if the sensor shows
32°F, it is working properly.
Compare the temperature and resistance to TABLE 1.
16
Figure 3
DEFROST TERMINATION
TEMP SENSOR
Figure 4
TABLE 1: Temperature/Resistance Characteristics (-50 to 80
o
F)
o
Temp.
NOTE: Use resistance at 32
F Temp. oC ohms*1k Temp. oF Temp. oC ohms*1k
-50 -45.6 43.45 15 -9.4 7.579
-40 -40.0 32.31 20 -6.7 6.731
-35 -37.2 27.96 25 -3.9 5.993
-30 -34.4 24.27 30 -1.1 5.349
-25 -31.7 21.13
-20 -28.9 18.43 35 1.7 4.781
-15 -26.1 16.12 40 4.4 4.281
-10 -23.3 14.13 50 10.0 3.454
-5 -20.6 12.42 60 15.6 2.805
0 -17.8 10.94 70 21.1 2.294
5 -15.0 9.651 80 26.7 1.888
10 -12.2 8.544
o
F for sensor checking.
32 0 5.123
Suction Pressure Transducer
The green lead is connected to terminal ‘1-‘ on the board. The white lead is connected to terminal ‘1S’ on the
board. The black lead is connected to terminal ‘1+’ on the board. The black wire gets 5 VDC, the white wire is
the signal, and the green wire is the ground. TABLE 2 shows the characteristics of the pressure transducer.
NOTE: The pressure transducer cannot be repaired but replaced only.
TABLE 2: Pressure Sensor Simulation Values ( 0 to 150 PSIA)
PSIG
Bar PSIA
0 0 -14.6 0.509
0.69 10 -4.6 0.784
1.379 20 5.4 1.058
2.069 30 15.4 1.332
2.758 40 25.4 1.587
3.448 50 35.4 1.862
4.137 60 45.4 2.136
4.827 70 55.4 2.391
5.516 80 65.4 2.665
6.206 90 75.4 2.920
6.895 100 85.4 3.194
7.585 110 95.4 3.469
8.274 120 105.4 3.724
17
V
(White to
Green)
Charging the Master Controller Refrigeration System
Note: If you are a first time installer of a Master Controller system, please call MasterBilt for on-phone training.
Since the system is built with high compressor EER, the head pressure control valve is not installed in this type
of system.
During initial pull down, after primary charge while the system is running, a large evaporator superheat is
built up. The electric expansion valve is then open all the way. If the system is charged full sight glass during
this period, the system is already overcharged.
The recommended charging procedures are:
(1) Charge the system by weighing exact amount of refrigerant specified by Master-Bilt for the unit.
TABLE 3 below give the proper refrigerant charges needed for each Blood Plasma sytem. The refrigerant
charge greatly depends on the length of the liquid line. Measure the line set carefully and use the table
provided accordingly.
TABLE 3: REQUIRED REFRIGERANT FOR RESPECTIVE SYSTEMS
Condenser BCLZR10AC
Compressor 9TH2-101E-TFC
Evaporator EXLRS330B
Liquid Line Length (ft) Refrigerant lbs of R-404 A
5
10 14.31
15 15.37
20 16.43
25 17.49
30 18.55
50 22.79
65 25.97
75 28.09
100 33.39
150 43.99
Liquid Line Size 7/8”
13.25
Technical Notes
• With the optional alarm relay the external temperature and alarm indicator should be connected to “C”
(common) and “NC” (normal close) terminals. The alarm does not indicate what causes the alarm. To
find out what has caused the alarm, check the onboard two-digit display for alarm codes and refer to
the diagnosis chart for corrective action. No electric current goes through the alarm output circuit.
Thermostat wiring can be used for connection.
• Defrost termination set point (Ds) can be also set as 50, 70 or 80oF. When setting the defrost
termination temperature, make sure that the frost is free after each defrost. Also make adjustments to
the maximum defrost duration when necessary.
18
o
• The superheat of each application can be set by the customer. Superheat 10-15
for winter operation, superheat 5-10
• Always clear the “LS”, “rH” and “rL” alarms after corrective action is taken. The sensor and
communication alarms cannot be cleared unless they are corrected.
o
F for summer.
F is recommended
• Follow the instructions in the Master-Bilt Condensing Unit and Refrigeration System Installation &
Operation Manual to perform the final check up before charging and starting up the system. Always
refer to this service manual, make sure all steps are understood. Don’t hesitate to call Master-Bilt
Customer Service Department at 800-684-8988 for technical assistance.
Electrical Wiring
WARNING
Please make sure to turn all power off before servicing electrical equipment. Always use a qualified
and trained technician. If you are the technician and a first-time installer of a Master Controller system,
call our service department at 800-684-8988 for free training and support.
The field wiring for the Master Controller in the Blood Plasma Room is somewhat different from the
wiring assosicated for the Ante Room. Since the Blood Plasma Control Board is mounted outside the Walk-in
Box, the control wiring will need to be done by the electrical contractor and the refrigeration technician. Please
see the wiring diagrams given below for conduit and wiring detail. A large Drawing for each of these is included
with your equiipment. Please note that the control wiring between the condenser and the evaporator may be
low voltage thermostat wire. All other high voltage wiring must be in compliance with local and national codes.
Figures 5 and 6 illustrate the wiring details for the Blood Plasma and Ante Rooms respectivelly.
19
FIGURE 5: TYPICAL WIRING DIAGRAM FOR BLOOD PLASMA ROOM
Component Voltage Amps Each
Freezer Door Heat 115/60/1 3.8
Lights (100W each) 115/60/1 0.87
Pressure Relief Port 115/60/1 0.46
Pass Thru Door Heat 115/60/1 1.3
N.O.
20
FIGURE 6: TYPICAL WIRING DIAGRAM FOR ANTE ROOM
1.3115/60/1Pass Thru Door Heat
3.8115/60/1 Freezer Door Heat
0.87115/60/1Lights (100W each)
0.46115/60/1Pressure Relief Port
Amps EachVoltageComponent
N.O.
21
Line Sizing and Insulation
Table 4 below depicts proper line sizing for each Blood Plasma system offerd by Master-Bilt. There is
no room for error when making line size selections and this guideline must be followed. The suction line must
be insulated with 1” minimum Armoflex® or equivalent insulation. The insulation must fit the piping properly and
all joints and bends be properly glued and sealed.
TABLE 4: LINE SIZING FOR BCLZR10AC
Condensing Unit Model
50' 75' 100' 150' 200' 50' 75' 100' 150' 200'
BCLZR10AC
1 3/8 1 3/8 1 3/8 1 3/8 1 3/8 7/8 7/8 7/8 7/8 7/8
Suction Line Sizes Liquid Line Sizes
Equivalent Length Equivalent Length
Start-Up Check List for Blood Plasma Refrigeration Equipment
1. All refrigerant piping should be complete and in accordance with Master-Bilt sizing selections. Please
contact our facility if you are unsure of proper line sizing. Good refrigeration piping practices must be
followed.
2. All refrigeration equipment should have reached proper vacuum levels prior to Master-Bilt Engineers
arriving on job site. Micron gauges should be left on systems so that Master-Bilt personnel may
observe that proper vacuum levels have been reached.
3. For -40ºF rooms, the Master Controller Board should be mounted outside Walk-In box and all electrical
conduits and circuits should be complete. Please reference supplied system drawings for proper
conduit schedule.
4. All electrical connections should be made. This shall include all EEVs, Pressure Transducers,
Temperature Sensors, and all respective power supplies for each refrigeration system.
5. All drain lines should be complete with insulation and drain line heaters wired. Electricity to drain line
heaters should be left off until start-up.
6. All lighting, door heaters, and pressure relief ports should be wired and ready to activate upon start-up.
7. Walk-In Boxes should be clear of debris that may have collected during installation process.
22
REVERSE CYCLE DEFROST
General Information
Master-Bilt’s patented (U.S. patent no. 7,073,344) reverse cycle defrost is an option provided on Master
Controller-equipped refrigeration systems only. If your Master Controller refrigeration system is equipped with
reverse cycle defrost, a reverse cycle valve is already factory-installed on the condensing unit. The valve’s
primary function is to reverse the direction of the refrigerant flow during defrost.
Under the normal refrigeration cycle, the refrigerant flow is the same as traditional refrigeration modes. During
the defrost mode, the refrigerant flow is reversed back through the evaporator coil heating it from the inside-out
along its entire length and completely eliminating frost buildup (see figure 5 below).
Figure 5
Advantages
Reverse cycle technology offers several significant advantages:
• An 80% reduction in defrost energy usage. This savings, coupled with that from the demand defrost
feature, dramatically reduces electrical consumption.
• Eliminates many mechanical parts
• Reduces cost of evaporator, installation and wiring
• Reduces defrost time
• No noticeable increase in freezer room temperature
• Product temperature rise significantly less
Factory-Installed Parts
A 4-way reversing valve is installed in a reverse cycle defrost unit. The 4-way reversing valve operates at 24
VAC. A transformer is installed in the master evaporaratpr to supply 24VAC to the 4-way reversing valve.
23
Eliminated Parts
The Master-Bilt Reverse cycle’s unique technology, coupled with the bi-flow electric expansion valve,
eliminates the need for:
• Defrost heaters, please note some evaporators will have heater, they are not wired.
• Head pressure control valves
• Check valves and expansion valves at the condenser that are normally necessary in traditional hot gas
defrost systems. Ante Room only!
• By-pass valves
• Liquid line solenoid valves
• Receiver tanks (Ante Room Only)
• Sight glasses on Ante Room Only
Removing these components reduces the cost of the evaporator itself and saves on installation and wiring.
Defrost Time
Defrost time is greatly lessened with the reverse cycle option. The average time using traditional defrost
heaters is 20-30 minutes but reverse cycle performs a completely “clean” defrost in 5-8 minutes on average.
Because the defrost is so rapid, there is no noticeable increase in freezer room temperature and the product
temperature rise is also significantly less. Reverse cycle defrost, combined with demand defrost, assures the
evaporator receives the number of complete defrosts needed at the necessary times to prevent iced
evaporators while assuring the protection of the valued product being stored.
Charging a Master Controller System Equipped with Reverse Cycle Defrost
Note: If you are a first time installer of a Master Controller system, please call MasterBilt for on-phone training.
Since the system is built with high compressor EER, the head pressure control valve is not installed in this type
of system.
During initial pull down, after primary charge while the system is running, a large evaporator superheat is built
up. The electric expansion valve is then open all the way. If the system is charged full sight glass during this
period, the system is already overcharged.
The recommended charging procedure:
In a reverse cycle defrost system, there may not be a liquid receiver. Charge the system at three lbs. per
ton of rated cooling capacity to start with. Let the system run through the pull down period until room
temperature is closely reached. Then gradually add refrigerant until actual superheat “SH” on board is
approaching superheat setpoint “SS”. Bubbles may be left in the sight glass.
How to diagnose an overcharged system:
An overcharged system will not operate properly.
• First, be sure that system is not leaking
• Compressor may be short cycling
• Frost building up on compressor suction section, suction filter or service valve
• Low superheat alarm appears on the controller display constantly
Solution:
Taking some refrigerant out of the system until on-board actual superheat “SH” is observed approaching
superheat setpoint “SS”.
Due to the reversing of the refrigerant flow, it is recommended tha t the refrigeration liquid line piping
also be insulated to prevent condensation drips between the condensing unit and the evaporator coil.
24
TROUBLESHOOTING GUIDE
Use the alarm display together with the chart below to check the causes of each error message.
Trouble, Alarm Codes Causes Corrective Actions
Pressure transducer alarm
SP, PRSR, dA, DPSR
Outlet sensor TS2 fails
So
SCSR
Room sensor TS3 fails
SA
RMSR
Low superheat
LS
LOSH
High room temperature
rH
HIRM
Low room temperature
rL, LORM
Defrost termination sensor TS1
fails
Sd. INSR
Low pressure alarm
LP, PAL
Communication
CA, CMAL
• Bad transducer
• Fitting leak
• Loose wire
• Wrong hook-up
NOTE: for DA or DPSR, high
side pressure transduce may be
out of range (0-500 psig)
• Mechanical damage
• Connection wire loose
• Overheated
• Out of range
• Mechanical damage
• Connection wire loose
• Overheated
• Out of range
• Superheat setting too low
• Wrong locations of TS1, TS2
• Sensors may be loose
• Uneven feeding of coil
circuits
• Overcharge of refrigerant
Defective electric expansion
valve (EEV)
• Compressor stops
• Insufficient refrigeration
• Heat load too large
• Compressor fails or high
pressure cuts out
• Evaporator fans may not run
• Door open for too long
• Coil iced-up
• Inproper low temp setpoint
• Over designed system
• Mechanical damage
• Loose connection wire
• Overheated
• Out of range
• Refrigerant leak
• Bad transducer
• Loose RS-485 coonection
• Failed communication port
25
• Replace the pressure transducer
• Repair leak
• Wire correctly
NOTE: for DA or DPSR, HS may need to be
raised.
• Tighten the connection wires on the
controller terminal
• When brazing suction line, take out the
sensor
• Install the sensor after brazing
• Tighten the connection wires on the
controller terminal
• The room sensor can be replaced by
surface sensor
• Change to correct set point
• Make sure the distributor is feeding each
circuit evenly
• Insulate the sensors with foam tape
• Use correct refrigerant charge
• Check EEV wiring
• Replace defective EEV
• Check compressor
• Check system design to select a sufficient
system
• Replace failed compressor
• Fix the evaporator fans
• Keep the cold room door closed during
refrigeration
• Check possible air leak through the walls
of cold room
• Change low temp set point
• Re-select the system
• Tighten the connection wires on the
controller terminal
• Let the sensor cool down to application
temperature range: –50
• Replace failed sensor
• Fix leak
• Replace pressure transducer
• Tighten the terminals
• Change a new controller board
o
F to +103oF
Troubleshooting the Electric Expansion Valve
If the valve stops moving, depending upon how far open it is, one or more alarms may be displayed. These
alarms include a low superheat alarm, a low temperature alarm, and/or a high temperature alarm.
Use the following steps to troubleshoot the valve:
1) Disconnect the valve from the controller.
2) The resistance between the black and white leads should be approx. 90 ohms. The
resistance between the black and red leads should be an open.
3) The resistance between the red and green leads should be approx.90 ohms. The resistance
between the white and green leads should be an open.
4) The resistance between each lead and the brass housing of the valve should be an open.
5) Read the AC, not DC, voltage across the black and white leads while the valve is moving.
The AC voltage should be 11 to 13 VAC. The voltage will be close to 0 VAC when the valve is
not moving.
6) Repeat step 5 across the red and green leads.
If any voltage is out of tolerance, replace the controller. If the above steps pass, inspect for contamination in
the valve or nicks on the seat of the valve.
CAUTION: If the valve was taken apart and was left running while taken apart, the piston may have come too
far out of the motor assembly. If you reassemble the valve with the piston in this position, the threads in the
piston will be stripped when the piston is forced into the seat while tightening the lock nut. Make sure the piston
is drawn up far enough into the motor assembly before reassembling.
MASTER-BILT PART NUMBERS
Use the chart below when ordering replacement parts for your Master-Bilt Master Controller refrigeration
system.
Item Description Part Number Notes
Blood Plasma Control Board 19-14096 Please re-set for applications
Ante Room Control Board 19-13988 Please re-set for applications
Electric Expansion Valve for Blood Plasma Room 19-14071 SEI-8.5 X 40, 7/8” X 1 1 1/8”
Electric Expansion Valve for Blood Plasma Room 19-14072 SEI-11 x 40 5/8” x 5/8”
Electric Expansion Valve for Ante Room 19-13772
Pressure Transducer for Blood Plasma Room 19-13955 Suction Pressure during Cool Mode
High Pressure Transducer for Blood Plasma Room 19-14092 Discharge Pressure during Cool Mode
Pressure Transducer for Ante Room 19-13955 Suction Pressure
Pressure Transducer for Blood Plasma Room 19-14092 Head Pressure @ Condenser
4-Way Reversing Valve 7.5 HP 09-09819 For 7.5 HP only!
4-Way Reversing Valve 12 HP 09-09783 For 12 and 16 HP only!
4-Way Reversing Valve 16 HP 09-09783 For 12 and 16 HP only!
4-Way Reversing Valve 2 HP 09-09776 For 2 HP Ante Room Condenser only!
Evaporator Inlet/Outlet Sensor (Surface Sensor) 19-14073 40 ft Leads
24VAC, 40VA Transformer 39--01088 120/208/240 V Primary
6 Pin, 25 ft Data Cable 19-13780 For use with remote panel display
Controller Mounting Cover Assembly 900-18151 For Ante Room Only
Remote Panel Display
For condensing unit installation and wiring, please consult the Master-Bilt Condensing Unit System Installation
and Operation Manual. If any discrepancy is found in this manual, please contact Master-Bilt Technical Service
Department immediately.
19-13778
SER-6, 3/8" x 1/2"
Standard Feature effective 05/08
26
908 Highway 15 North
New Albany, MS 38652
Service Dept. phone: 800-684-8988
Fax: 866-882-7629
Email: service@master-bilt.com
REV 07 Aug 2008, TBC
27
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