Part No. 4801-5117 Rev. 8-01 Owners Manual Farm Hand SCS
Farm Hand SCSFarm Hand SCS
Farm Hand SCS w/BackFarm Hand SCS w/Back--UpUp
Hired Hand, Inc.
1733 Co Rd 68
PO Box 99
Bremen, AL 35033
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS Table of Contents
Table of Contents
Section Title Page
1. Ratings and Specifications..............................................................................................................................1
2. Warnings.........................................................................................................................................................1
3. Limited Warranty............................................................................................................................................1
4. Introduction to the SCS™(Smart Contactor System)......................................................................................2
5. Farm Hand SCS Panels...................................................................................................................................3
5.1 Illustration Of Farm Hand SCS™ with Back-Up....................................................................................4
5.2 Farm Hand SCS™ Stage Control Switches ............................................................................................4
6. Connecting Multiple SCS™ Panels to a Master Controller............................................................................5
7. Introduction to the SCS™ Back-Up System...................................................................................................6
8. SCS™ Back-Up Operating Conditions...........................................................................................................6
8.1 Normal SCS™ Operation .......................................................................................................................6
8.2 Emergency Operation .............................................................................................................................7
8.3 Override Operation.................................................................................................................................7
8.4 Fail-Safe Relay Operation.......................................................................................................................7
9. Curtain Operation During Back-up.................................................................................................................8
10. Setting SCS™ Back-Up Stage Jumpers......................................................................................................8
11. Changing the SCS™ Curtain Back-Up Stage.............................................................................................8
12. Day-to-Day Back-Up Operating Instructions..............................................................................................9
12.1 Toggle Sequence of Mode Button ..........................................................................................................9
12.2 Checking/Adjusting Temperatures, and Settings ....................................................................................9
13. Set Limits....................................................................................................................................................9
14. Program Mode Parameters........................................................................................................................10
15. Calibrate Sensors......................................................................................................................................10
16. Installation................................................................................................................................................11
16.1 Unpacking Components........................................................................................................................11
16.2 Installation Instructions.........................................................................................................................11
16.3 Checklist For Setting Up Control Of House Temperature....................................................................11
17. Wiring Diagrams.......................................................................................................................................12
17.1 SCS™ 16 Stage Assembly with Back-Up.............................................................................................12
17.2 Setting the Back-Up Board Jumpers, Sensors and Alarm Connections................................................13
17.3 16 Stage SCS™ Panel...........................................................................................................................14
17.4 Setting the Local Network Address ......................................................................................................15
17.5 SCS™ Local Net and Back-Up Interconnection Diagram....................................................................16
17.6 SCS™ Connections to the Power Supply .............................................................................................17
17.7 SCS™ Connections to the Curtain Machine.........................................................................................18
17.8 Connecting Power from Breaker to a Heat Stage or Cool Stage...........................................................19
18. Maintenence..............................................................................................................................................20
18.1 Removing and Replacing a Relay Strip ................................................................................................20
19. Temperature vs. Sensor Resistance Table.................................................................................................21
20. Error Codes...............................................................................................................................................22
21. SCS™ Program Label...............................................................................................................................23
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 1
1. Ratings and Specifications
• 115/230 Volts (Depending on switch position.)
• 50/60 Hz.
• 1 hp .per stage @ 125VAC, 2 hp per stage @ 240 VAC.
• Room must be kept above 32°F/0°C.
Note: Fail-Safe relay strips are rated at half the load shown above. Care should be taken to insure that
Fail-safe relays are not overloaded.
2. Warnings
Warning!
When this controller is used in a life support heating and ventilation system where
failure could result in loss or injury, the user should provide adequate back-up, or
accept the risk of such loss or injury!
3. Limited Warranty
All products are warranted to be free from defects in material and workmanship for a period of one year
from the date of purchase if installed and used in strict accordance with the installation instructions.
Liability is limited to the sale price of any products proved to be defective or, at manufacturer’s option,
to the replacement of such products upon their return. No products are to be returned to the
manufacturer, until there is an inspection and/or a return-goods authorization (RGA) number is issued.
All complaints should be directed first to the authorized distributor who sold the product. If satisfaction
is not obtained or the name of the distributor is not known, write the manufacturer that appears below,
directed to the attention of Customer Service Manager.
This limited warranty is expressly in lieu of any and all representations and warranties expressed or
implied, including any implied warranty of merchantability or fitness for a particular purpose. The
remedy set forth in this limited warranty shall be the exclusive remedy available to any person. No
person has authority to bind the manufacturer to any representation or warranty other than this limited
warranty. The manufacturer shall not be liable for any consequential damages resulting from the use of
our products or caused by any defect, failure or malfunction of our products. (Some areas do not allow
the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion
may not apply to you.)
This warranty gives you specific legal rights and you may also have other rights that vary from area to
area.
Warrantor:
Hired-Hand, Inc.
1733 Co. Rd. 68
PO Box 99
Bremen, AL 35033
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 2
4. Introduction to the SCS™(Smart Contactor System)
The SCS™ (Smart Contactor System), in its simplest definition, is an output drive system that is used
along with an environmental control. This drive system is capable of driving inductive loads of up to
1 hp. But, as the name implies, this system is much more than a normal mechanical relay system.
This section will introduce you to most of the important functions of the SCS™ panel. The following
lists the SCS™ panels that are currently available:
• 16 Stage SCS™ w/Back-Up System
• 16 Stage SCS™ Expansion System
• 8 Stage SCS™ Expansion System
• 24 Stage SCS™ w/Back-Up System*
* This system is not shown in this manual. It is used exclusively with the Farm Hand Vent Master 24.
Refer to Part No. 4802-5124, “Farm Hand Vent Master 24”, for specific information on the 24 Stage
SCS™.
The SCS™ name is derived from the intelligence and flexibility that the drive system possesses. Its
flexibility is displayed by the systems ability to be expanded at any time. It is built in 16 stage blocks
so the user can choose how many outputs stages are satisfactory. Depending on the environmental
controller that is used, up to eight 16 Stage SCS™ panels can be attached to the controller. That
allows an almost unlimited number of stages to be utilized. Inside the SCS™, outputs are grouped
together using relay strips. There are four relays on each strip. These strips are easily removed in the
event of a failure. You no longer have to worry about replacing an entire PC board every time one
mechanical relay fails. In addition, there is no rewiring involved.
The SCS™ panel’s intelligence is displayed in many ways. First, it only requires a twisted pair wire
to be connected from the master controller to itself. Additional stages are added by a “daisy-chain”
connection from one SCS™ to the next. In addition, the SCS™ is capable of relaying information
back the master controller that indicates the status of the stages. For example, it can detect if a stage is
not being allowed to operate due to the “Auto-Off-Manual” switch. This information can be used to
determine if an emergency situation has arisen. If so, the master controller can use the SCS™ Back-
Up System to override. This brings us to the most important feature of the SCS™ panel, the Back-Up
System.
An integrated Back-Up System accompanies the SCS™. This Back-Up System is like none before.
The SCS™ still exists as a stand-alone Back-Up System with its own temperature sensors. The
SCS™ still allows the user to set a “High Limit” and a “Low Limit” in which the system will maintain
by using three back-up cooling stages and one back-up heating stage. In addition, the SCS™ has
constant communication with the master controller. The importance of this communication will
become clear when you read the Back-Up System section of the manual, Section 7. This additional
communication means an added layer of protection for your important investment.
The SCS™ also contains an important fail-safe relay function. Should the SCS™ become inoperative,
such as loosing its power source, one relay strip (4 stages) will fail in a safe condition. This will cause
the ventilators connected to the selected relay strip to be switched on. See Section 8.4 for more
information about the fail-safe relay function.
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 3
5. Farm Hand SCS Panels
Farm Hand SCS 8 Stage Expansion Module
Farm Hand SCS 16 Stage Expansion Module
Farm Manager SCS 16 Stage Assembly
with Back-Up
Stage Control
Switches
Stage
Status
Indicators
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 4
AUTO
OFF
ON
Stage Control Switch (3 position)
Stage Status Indicators
Write in
the Name
you
choose for
this Stage
Stage Control
Switches
Main
Display
Control
Buttons
Back-Up
Stage
Indicators
Display
Indicators
Farm Manager 16 stage SCS™
with Back-Up
5.1 Illustration Of Farm Hand SCS™ with Back-Up
The Farm Hand SCS™ with Back-Up is designed to operate as a one room controller. (See Section
7.) There are two main areas on the SCS faceplate. These are the Stage Switch area and the Main
display area. The Stage switch area contains the stage control switches and an area to label the
function of an individual stage. The label area also contains the stage status indicator. See Section
5.2 for a more detailed
discussion of this area.
The Main display area
contains controls and
indicators for
monitoring and
programming the SCS
Back-Up. When the
controller is operating
normally, the Main
Display shows the
current room
temperature. The
display can also display
the high and low room
temperature limits. See
Section 12.1. The
Control buttons are
Mode, plus (+), and
minus (-) and are used
to select the
information in the main
display. The type of information in the main Display is indicated by which Display Indicator LED is
lighted. See Section 12.
Finally, the Back-Up Stage Indicators will indicate if the SCS™ as gone into Back –Up and in which
of the four Back-Up modes the SCS™ is currently operating. Under normal operation none of these
LEDs will be lighted. If back-up HEAT is required, the LED beside Heat will be lighted. If back-up
cooling is required, the LED beside COOL 1 will be lighted. If additional cooling is required, the
LED beside COOL 2 and COOL 3 will also be lighted depending on the setting of the temperature
limits and the actual temperature. See Section 8.1.
5.2 Farm Hand SCS™ Stage Control Switches
The SCS™ Panel has a three
position switch for each one of
the stages. There is a clear white
area in which the name of the
stage can be written, and the
Stage Status indicator is located.
This red LED is ON if the stage
is running. The SCS™ will
control the stages based upon the
switch settings as follows:
ON – In this position the stage
runs continuously. The
stage can not be turned off by the SCS™ Panel or the Master Controller.
OFF – In the “OFF” position the Stage will not run except under Back-Up control.
AUTO – The stage is under control of the SCS™ panel and the associated Master Controller.
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 5
6. Connecting Multiple SCS™ Panels to a Master Controller
Up to 128 SCS™ stages can be controlled from a Master controller over the Farm Hand Local
Network. Control information is passed between the Master Controller and each of the SCS™ Panels
over a Local Network connection. The Local Network connection only extends between the SCS™
Panels and the Master Controller and is different from the Network that is used to connect other types
of Farm Hand controllers to a Personal computer as in the Farm Manager Network. An illustration of
several SCS™ Panels connected to a Master Controller is illustrated below:
Up to eight SCS™ 16 Stage Panels can be controlled over the Local Network. The Local Network
connection cable is run from the Master controller
to the SCS™ Panels in any order. The SCS™
Panels are assigned individual Local Network
addresses so the Master controller can
communicate with the desired SCS™ Panel.
Local addresses are assigned by setting a series of
three DIP switched on the SCS™ Panel circuit
board. See Section 17.4 for the location of the DIP
switches. There are three switches that can be set
as shown in the above table. For example, if all
three of the DIP switches are set to “ON”, the
SCS™ Panel identifies and controls stages 1
through 16. If the DIP switches are all set to “OFF” the SCS™ Panel identifies and controls stages
113 through 128.
Farm Manager SCS™ Local Network
Farm Hand 8 or 16 SCS Panel
Up to eight SCS 8 or16
stage Expansion Modules
Farm Hand 8 or 16 SCS Panel
Node
0
Node
1
Node
2
Node
3
Farm Hand 8 or 16 SCS Panel
Farm Hand 8 or 16 SCS Panel
Farm Hand Master Controller
To Other 8 or 16 SCS Panels
Note
1: Each of the SCS Panels must
be set to the proper Local Network
Address. See Section 6.
Note 2: If Back-Up is used, only one
of the SCS Panels needs to be an SCS
Panel with Back-Up. See Section
XXX.
LOCAL NET ADDRESS
SWX 1
ON
1 2 3
DIP switches
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 6
DIP Switch Settings SCS™
Stage
Address
Assignment
No. 1 No. 2 No. 3
ON ON ON 1 –16
OFF ON ON 17-32
ON OFF ON 33-48
OFF OFF ON 49-64
ON ON OFF 65-80
OFF ON OFF 81-96
ON OFF OFF 97-112
OFF OFF OFF 113-128
As discussed in Section 7, the SCS™ can be used with Back-Up. In the Local Network configuration
shown above, any one of the SCS™ units can be equipped with the Back-Up circuit board. Further,
only one Back-Up board is required within any Local Network. See Section 17.5 for a wiring
diagram.
7. Introduction to the SCS™ Back-Up System
The SCS™ system has the option of containing an
integrated Back-Up System. This Back-Up System
contains 4 stages: 1 Heat and 3 Cool. This system’s
purpose is to back up the master controller in the case
of failure. The Back-Up System is a stand-alone
control system. It contains its own temperature
sensors that react to a High and Low Limit. It
contains its own drive relays that are capable of
overriding the master controller and the stage switches
that are located on the SCS™ panel.
This Back-Up System is unlike any emergency control
system on the market. This system offers a much
higher level of protection. In addition to being able to
monitor for high and low temperatures, it also stays in constant communication with the master
controller. This communication allows the Back-Up System to run a minimum ventilation timer on
Cool 1 or override the SCS™ panel if certain conditions warrant. The conditions are explained in
Section 8. All Back-Up Systems can protect against a high or low temperature but only this system
can protect against today’s biggest grower concern: MINIMUM VENTILATION FAILURE.
8. SCS™ Back-Up Operating Conditions
As explained above, this is more than your customary Back-Up System. This system contains three
separate modes of operation that are entered depending on the circumstances. These modes are
Normal Operation, Emergency Operation, and Override Operation. These modes will be explained in
more detail below. These modes are entered based on information that it has received, or not
received, from the master controller. No matter what mode of operation the Back-Up System is in, it
will always attempt to maintain the temperature inside the High and Low Limits.
8.1 Normal SCS™ Operation
During Normal Operation, the Back-Up System always maintains the temperature between its high
and low limits. It accomplishes this by using its temperature sensors and its four stage outputs. If the
temperature drops below the Low Limit, the Heat stage will come on. That stage will not turn off until
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 7
it warms the building at least 2°. The same is true if the temperature goes above the High Limit
however, there are three levels of cooling stages on the Back-Up System. The following example
explains the operation of the stages in relationship to the temperature and the limits.
In this example the Low Limit is set as 66ºF, and the High Limit is set as 86ºF. If the temperature
drops to 66ºF, then the HEAT stage turns on. The HEAT stage turns off when the temperature rises to
68ºF (2º above the Low Limit). If the temperature rises to 86ºF, then COOL 1 turns on. If the
temperature continues to rise to 88ºF (2º above the High Limit), then COOL 2 turns on. If the
temperature rises to 90ºF, then COOL 3 turns on. Stages turn off at temperatures as indicated by the
arrows in graph 1.
8.2 Emergency Operation
In this mode of operation, the system still maintains the temperature as it does in Normal Operation.
In addition, it will begin running the first cooling stage (Cool 1) on a 5 minute timer. The timer
percentage is determined by the setting in P3 (Emergency Timer Percentage). This mode of operation
is entered if communication is lost between the master controller and the Back-Up System. In this
case, the Back-Up System assumes that the master controller is lost and tries to maintain the minimum
ventilation until someone recognizes the problem. Emergency Operation is indicated by a “LnE”
flashing in the display of the Back-Up System. The alarm relay on the Back-Up System is also
engaged in this mode operation.
8.3 Override Operation
In this mode of operation, the system still maintains the temperature as it does in Normal Operation.
In addition, it receives commands from the master controller to turn on certain stages of heating or
cooling. There are many different circumstances that could cause this to happen, in this manual, we
will list one of the most common. For example, if communication were lost from the SCS™ panel to
the master controller, the master controller would be unable to turn the appropriate stages on in the
usual way. Therefore, the master controller would communicate to the Back-Up System and indicate
which stages that it is trying to turn on. At this point, the Back-Up System would obey the command
and turn the appropriate stages on. For this mode of operation to work to its fullest potential, care
must be taken to insure that the stage jumpers on the relay strips match the stage setting in the master
controller (Refer to Section 12). Override Operation is indicated by a “LnO” flashing in the display of
the Back-Up System. The alarm relay is also engaged in this mode of operation.
8.4 Fail-Safe Relay Operation
There are two types of Relay strips used in the SCS™. The Normally Open (NO) strip requires a
signal from the controller board in order to energize a stage of ventilation. Should power be removed
from the SCS the Normally Open Relay strips would not be able to energize a ventilator. On the other
64 68 72 76 80 84 88 92
Heat
Cool 3
Cool 2
Cool 1
Temperature (ºF)
Graph 1 Cool 1, 2, 3 and Heat
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 8
To Back-
up Relay
hand the Fail-Safe relay strip would close each of the relays in the strip resulting in energizing the
ventilators in case of a controller power failure. Each of the relay strips contains four relays for
controlling four stages. In the SCS™ 16 there are a total of four relay strips, three will be N.O. and
one will be a Fail-Safe. In the SCS™ 8 there are two relay strips. One is a N.O. and one is a Fail-
Safe strip. The operator must insure that the Fail Safe relay strip is connected only to stages that
should be turned on in case of a controller failure. See Section 18 for a physical description of the
relay strips. It is not recommended to place heating equipment on Fail-Safe stages.
9. Curtain Operation During Back-up
The SCS contains a relay that can operate the curtains during Back-up operation of the SCS. The
curtains will automatically open during back-up based upon the selection of the back-up stage, either
COOL1, COOL2 or COOL 3. The SCS is shipped from the manufacturer with the Curtains connected
to the COOL 1 Stage. To change the Cool stage see Section 11.
10. Setting SCS™ Back-Up Stage Jumpers
Pictured at the right is a Stage Relay Board consisting of four stage relays and the associated stage
jumper for each stage relay. The stage jumpers a
labeled COOL 1, COOL 2, COOL 3 and HEAT.
Location of the jumper places the stage in one of
these four modes, or if the jumper is not inserted, the
stage is not placed on Back-Up. The jumpers
should be placed based on the operation of stage
equipment and should be the same as assigned in the
Master Controller. Jumpers are placed according the
following table:
Type of Stage
Operation Jumper
Assignment
Cool Negative Fan COOL 1
Cool Negative
Tunnel Fan COOL 2
Cool Tunnel Fan COOL 3
Heat Stage HEAT
Stage not on Back-
Up No Jumper
Installed
11. Changing the SCS™ Curtain Back-Up Stage
At the top of the SCS relay board is a terminal strip labeled BACKUP
SYSTEM. Connect the jumper to the appropriate Stage, either COOL
1, COOL 2 or COOL 3. The SCS system is sent from the manufacturer
with the Backup curtain connection to COOL 1.
Stage
Jumpers
STAGE RELAY BOARD
Stage Relay
Stage
Harness
connector
cables to
Terminal
Block
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 9
12. Day-to-Day Back-Up Operating Instructions
12.1 Toggle Sequence of Mode Button
Continuously pressing the Mode button cycles the display through the parameter sequence as
illustrated below. The parameter data is shown in the display.
12.2 Checking/Adjusting Temperatures, and Settings
When you press the Mode button, watch the green LED’s beside the main display. Whichever LED is
lit is the parameter you are viewing: “Room Temp”, “High Limit”, and “Low Limit” values.
Note: To adjust these parameters, press the Mode button until you see the parameter you want to
adjust, then use the + button to increase the value, and the - button to decrease the value.
Room Temperature
The average of the sensors located inside the house, or the temperatures of sensors 1 and 2
alternately displayed in the main display if sensor 2 is enabled.
High Limit
The temperature inside the house at which the controller will turn on the first SCS™ Back-
Up cooling stage.
Low Limit
The temperature inside the house at which the controller will turn on the first SCS™ heating
stage.
13. Set Limits
The Farm Hand SCS™ Back-Up System requires setting of a High Limit and a Low Limit at which
cool/heat stages will turn on. To determine where to set the High Limit and the Low Limit, first
decide on a target temperature of the house. This is usually the target temperature of the primary
controller. Then set the High Limit to a temperature several degrees above the desired target
temperature. Set the Low Limit to a temperature several degrees below the desired target temperature.
Note: It is recommended that the High Limit be at least 10º above the room’s target
temperature and that the Low Limit be 10º below the room’s target temperature.
Set High Limit
To set High Limit:
1. Press the “Mode” button to select the High Limit Indicator.
Display LEDs
Display
Room Temp
High Limit
Low Limit
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 10
2. Press the ”+” and ”–“ buttons to enter the value of the High Limit.
3. Setting Complete.
Set Low Limit
To set Low Limit:
1. Press the “Mode” button to select the Low Limit Indicator.
2. Press the + and – button to enter the value of the Low Limit.
3. Setting Complete.
14. Program Mode Parameters
Settings that are usually set up once per growout, or maybe even just for summer or winter are
referred to as program parameters and are accessed by taking the controller to program mode. To get
to program mode, press and hold the “Mode” button for five seconds. When the controller has entered
program mode, the main display will flash between “P1” and the value of this parameter.
The “P1” is known as a parameter number. All the program items for the controller have a parameter
number assigned to them. The numbers are listed in the table “Program Mode Parameters” below with
a short description of each parameter. When in program mode, you change the value of certain
parameters by using the + and - buttons as needed. When you have finished with the current setting,
press the “Mode” button to move to the next parameter. The program mode parameters for the Farm
Hand SCS™ are shown in Table 1.
Table 1. Program Mode Parameters
15. Calibrate Sensors
The temperature sensors should be calibrated to ensure accurate temperature detection. To calibrate
the sensors an independent temperature measurement is required such as a thermometer or
thermocouple.
Parameter Description
P1 This selects either English (OFF = Fahrenheit) or Metric (ON = Celsius) temperature
units.
P2 Determines if an alarm is sent on a Back-Up condition. (ON = Alarm On, OFF = Alarm
OFF) An alarm will be generated on an error condition even if P2 is set to OFF. See
Section 20.
P3 Emergency Timer Percentage. (0% to 100%). This determines the percentage that
COOL 1 will be run in an Emergency condition.
P41 This is the software version number. Not Changeable.
P42 This is the Setup Number that represents the controller type. Not Changeable.
PS1 This is the calibration temperature for Sensor 1.
Instructions: With the controller operating, use a digital thermometer or similar
independent temperature measuring device to measure the temperature at Sensor 1
location. With PS1 selected, use the + and – buttons to set the calibration temperature
to the thermometer reading.
PS2 This is the calibration temperature for Sensor 2.
Instructions: Same as Sensor 1 except substitute PS2 for PS1 in the instructions above.
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 11
1. Place a thermometer inside the house at the location of each sensor. Allow a few minutes for
the temperature to stabilize.
2. Take readings from the thermometers located at Sensor 1 and Sensor 2.
3. Use the Program Mode to set calibrations of Sensor 1 and Sensor 2 (Refer to Table 1).
16. Installation
16.1 Unpacking Components
Unpack the system, and check that all components are present. Locate the required tools.
1 Farm Hand SCS™
1 Installation Kit
2 Temperature Sensors
1 Manual
16.2 Installation Instructions
1. Hang Farm Hand SCS™ with four screws and the plastic mounting brackets included.
2. Make sure all power supplies are disconnected before breaking any wires, or reaching into the
enclosure.
3. If the SCS™ contains a Back-Up, open the Farm Hand SCS™ and locate sensor connections.
Refer to Wiring Diagrams, Schematics, etc.
4. For the Back-Up, run sensors out to locations inside the house. Be sure that the sensors are in a
safe location, free from any extreme temperature influences (direct sunlight, water, etc.) Use care
when securing sensor wires so that you do not cut the wire. Any short or break in the wire will
cause improper sensor operation.
5. Connect each sensor to its appropriate terminals inside the enclosure. See Section17.2.
6. Wire the power supply. See Section 17.6
7. Wire the individual stages. See Wiring Diagrams at the back of this manual.
8. Wire the Local Network connection.
9. Close the Farm Hand SCS™ and tighten the two screws in the lid to secure the unit shut.
16.3 Checklist For Setting Up Control Of House Temperature
Please read and follow the Installation instructions on the following pages. Refer to the following
checklist as an aid in setting the Farm Hand SCS™ Back-Up controllers.
1. Physically install the controller, temperature
sensors, and wires leading from the output
stages to cooling and/or heat equipment or to a
control panel.
Refer to Section 16, Installation
Refer to Section 17.8, Connecting
Power from Breaker to a Heat Stage
or Cool Stage
2. Verify the jumpers on the Stage block to that
select either 115v or 230v operation. Set
Heat/Cooling Stage options.
Refer to Section17.8, SCS™
Connections to the Power Supply
3. Install power to controller. Refer to Section 17.6.
4. Set High Limit & Low Limit Refer to Section 13, Set Limits
5. Calibrate Sensors Refer to Section 15, Calibrate
Sensors
Tools Required:
Mini Screwdriver
Wire Strippers
Standard Screwdriver
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 12
17. Wiring Diagrams
Warning!
Before connecting power to the machine, be sure to place the jumpers that select the line
input voltage. See Section 17.6.
17.1 SCS™ 16 Stage Assembly with Back-Up
J18 J19 J16
G1
R5
J24J22J23
ULN2803A
U8
ULN2803A
U5
R21
R22R20
R28
R29
R30
G2
R6
TZ3
G3
R7
TZ1
R4
ULN2803A
U6
R25
R26
R27
TZ2
J8
J7
J9
J2
R24
R23
J21
J20
J17
J1 J3
R9
R8
ULN2803A
U7
R19R14R10
74HCT373
U3
R114
R111
R112
R110
R109
R108
R107
X101
C103
C104
J4
J5
J6
J10
J11
SWX1
R18
R13
R12
R11
R3
R2
R1
C4
X1
C3
C5
PIC16C63
U1
75176
U2
C6
R15
MOV6
MOV5
J25
PIC16C73A
U102
93LC66
U104
C101
MC14489
U105
J105
R106
U103
ULN2803A
75176
U101
C102
J12J13J14J15
74HCT373
U4
Q1
R16
J26
C9
BR3
BR1
C11
ADJ OUT IN
VR4
D22
RLY104
RLY101
RLY102
RLY103
RLY105
J104
J102
J109
R31
R32
J101
J107
R101
R102
R105
J106
J103
R113
R103
R104
J110
J108
D4
D3
D1
D7
CUT-OUTCUT-OUT
CUT-OUTCUT-OUT
CUT-OUT CUT-OUT
RELAY STRIP 1-4
B. Crider
Copyright (c) 2000
Hired Hand, Inc.
LOCAL NET ADDRESS
COOL3COOL2COOL1HEAT
B
A
KUP SYSTEM
HEAT
COOL3 COOL2 COOL1
BACKUP SYSTEM
L1
EARTH
AC POWER (<24 V)
L2
EARTHL2L1
A
POWER (<24 V)
NC
+
-
LO
A
L NET
NC
-+
LOCAL NET
RELAY STRIP 5-8 RELAY STRIP 9-12 RELAY STRIP 13-16
PCB 162 Rev 'A'
Hired Hand, Inc.
Copyright (c) 2000
B. Crider
PCB 163 Rev 'A'
STATUS LEDs
TRANSMIT
RECIEVE
NORMAL
POWER
BACKUP ALARMSENSOR 1SENSOR 2
BLACK
COM WHITE
SENSOR 2
ENABLE
ON=Enabled
OFF=Disabled
NO NC WHITE BLACK
LIGHTS
COMMON
120VAC HOT
120VAC NEUT
GROUND
FAN
CONTROL
MICRO
SWITCH
Power Supply
Stage Connecting
Blocks Local
Network Back-Up
Connection
Power Supply
(24 VAC)
Back-Up
Control Board
Status
LEDs
Local Net
Address
Switches
Curtain Back-up
Connection
Curtain Back-
up Stage
Connection
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 13
17.2 Setting the Back-Up Board Jumpers, Sensors and Alarm Connections
Inset A
Inset B
Inset C
Inset A
Jumper Connection to
Enable Sensor 2
Inset B
Sensor 1 & 2 Connections
Inset C
Back-Up Alarm Connection
Sensor 2
Enabled
Installed – Enabled
Vacant – Disabled
Jumper
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 14
17.3 16 Stage SCS™ Panel
Back-Up Jumper Positions
(One Jumper block for each stage)
Cool 1 – Cool Negative
Cool 2 – Cool Negative Tunnel
Cool 3 – Cool Tunnel
Heat – Heat Stage
No Jumper – Stage not on Back-Up
NOTE: Jumpers must match the settings
of the Master Controller.
Inset A
Jumper Positions Inset B
SCS Status Indicators
STATUS LEDs
Power
Normal
Receive
Transmit
LED Status Indicators
Power – Green when power applied to board.
Normal – Red when Network and Board are OK.
Receive – Red when receiving over the Local
Network. (NOTE: This LED may appear
to be on continuously)
Transmit – Red when transmitting to the Master
Controller.
COOL 3
COOL 2
COOL 1
HEAT
Inset B
Inset A
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 15
17.4 Setting the Local Network Address
DIP Switch Settings SCS™ Stage
Address
Assignment
No. 1 No. 2 No. 3
ON ON ON 1 -16
OFF ON ON 17-32
ON OFF ON 33-48
OFF OFF ON 49-64
ON ON OFF 65-80
OFF ON OFF 81-96
ON OFF OFF 97-112
OFF OFF OFF 113-128
LOCAL NET ADDRESS
SWX 1
ON
1 2 3
Inset A
Inset A
NOTE: If using the SCS Panel with the Vent Master 24, refer to the Vent
Master 24 Owners Manual (Part # 4801-5124) for proper wiring
connections and network address settings.
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 16
17.5 SCS™ Local Net and Back-Up Interconnection Diagram
SCS™ 16 Stage
SCS™ 16 Stage
SCS™ 16 Stage
w/Back-Up
To Master
Controller
Pos (+) - Red
Neg (-) – Black
NC- Green
Inset A
Inset B
Inset A Inset B
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 17
17.6 SCS™ Connections to the Power Supply
H
O
T
12
0V
N
E
UT
24
0V
N
E
UT
G
R
O
U
N
SCS
™
Panel
Power Supply
L1 (Hot)
L2 (Neutral)
Ground
From Breaker
Panel
Wire jumpers as
shown below for
either 120 or 240
volts AC.
120V use red jumpers, jump pos. 1&4, 2&3
240V use black jumper, jump pos. 2&4
HOT
120V
NEUT
240V
NEUT
GND
1 2 3 4 5 6
240 Volts 120 Volts
120V use red jumpers, jump pos. 1&4, 2&3
240V use black jumper, jump pos. 2&4
HOT
120V
NEUT
240V
NEUT
GND
1 2 3 4 56
Part No. 4801-5117 Rev. 8-01 Farm Hand SCS 18
17.7 SCS™ Connections to the Curtain Machine
Top Left of SCS Panel
POWER TRAK
HOT OPEN CLOSE
HOT OPEN CLOSE
CONTROLLER
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