Varifan MST-5 User manual

MST-5
USER’S MANUAL
6
5
1
2
3
4
10
11
7
8
9
12
F2
rel
rel
rel
rel
MST-5
12345
S
T
A
G
E
2
S
T
A
G
E
3
S
T
AG
E
4
reduc.
per day
C
O
O
L/
H
E
A
T
C
O
O
L
/H
E
AT
A
L
A
R
M
A
L
A
R
M
5 STAGE
THERMOSTAT
computer compatible
ADJUST
Varifan
®
TIMER
on
off
P
E
R
I
O
D
L
IM
I
T
C
O
O
L
S
T
A
G
E
S
H
E
A
T
S
T
A
G
E
S
S
T
A
G
E
5
TI
M
E
R
www.monitrol.com

Page 2
MST 5
Although the manufacturer has made every effort to
ensure the accuracy of the information contained herein,
this document is subject to change without notice due to
ongoing product development.
WARNING AND PRECAUTIONS
Equipment , probe failure, blown fuses and/or tripped
breakers may prove harmful to the contents of the
building. Therefore it is strongly recommended to install
backup devices and alarm or warning devices. Spare
equipment should also be available at the owner’s site.
Equipment manufactured by the manufacturer is
protected against normal line surges. High surges caused
by thunder storms or power supply equipment may
damage this equipment. For added security against line
voltage surges it is recommended that surge and noise
suppression devices be installed at the electrical
distribution panel. Use of shielded cable for probes is
recommended for protection against lightning. These
devices are available from most electrical supply
distributors.
RECOMMENDATIONS
The manufacturer recommends that all installation
procedures described herein be performed by a qualified
electrician or installation technician. Further more the
manufacturer recommends to test all the functions and
equipment connected to the MST, including the alarm
system and backup devices, after installation, after
change to the installation and once a month after that.
Fuse verification and replacement, as well as the proper
setting of control values shall be the responsibility of the
owner.
www.monitrol.com

Page 3
CHAPTER 1 - INTRODUCTION
1. General ........................................................................... 5
1.1 Description....................................................................... 5
Definition of terms ........................................................................ 7
CHAPTER 2 - INSTALLATION
2.1 Unpacking........................................................................ 9
2.2 Mounting ......................................................................... 9
2.3 Switch Settings ............................................................... 10
2.3.1 Line Voltage Selector Switch.......................................... 10
2.3.2 Software Settings Switch................................................ 10
2.4 Connection Procedure.................................................... 11
2.4.1 Input Power .................................................................... 11
2.4.1.1 115 VAC ......................................................................... 11
2.4.1.2 230 VAC ......................................................................... 11
2.4.2 Wiring diagram ............................................................... 11
2.5 Temperature probe......................................................... 12
2.5.1 Single Temperature Probe ............................................. 12
2.5.2 Averaging ....................................................................... 12
2.6 Alarm .............................................................................. 12
2.7 Powering Up................................................................... 13
CHAPTER 3 - USER GUIDE
LED Status Window........................................................ 19
Control Dials................................................................... 19
PRIMARY FUNCTIONS
Main Set Point Temperature........................................... 21
Stage 1 Duty Cycle timer................................................ 22
Stage 2 Relative Set Point.............................................. 23
Stage 3 Relative Set Point.............................................. 24
Stage 4 Relative Set Point.............................................. 25
TABLE OF CONTENTS
www.monitrol.com

Page 4
MST 5
CONTENTS CONTINUED...
Stage 5 Relative Set Point ............................................. 26
Differential Cool Stages ................................................. 27
Differential Heat Stage .................................................. 28
Ramping ......................................................................... 29
Record Low Temperature............................................... 30
Record High Temperature.............................................. 31
Ambient Room Display................................................... 32
SECONDARY FUNCTIONS
Stage 1 Duty Cycle Period ............................................. 33
Drip Cool Duty Cycle ...................................................... 34
Stage 4 (Heating or Cooling mode)................................ 35
Stage 5 (Heating or Cooling mode)................................ 36
Minimum Ramping ......................................................... 37
Low Temperature Alarm................................................. 38
High Temperature Alarm ................................................ 39
APPENDIX
Troubleshooting........................................................................... 40
Specifications .............................................................................. 41
Record Form ............................................................................... 42
www.monitrol.com

Page 5
1. GENERAL
This document provides a description of the MST-5 control
panel. This document is organized as follows:
•Introduction
•Installation
•User’s Guide
•Appendix
1.1 DESCRIPTION
Congratulations on the purchase of your MST-5 Multistage
Thermostat. The MST product line provides you with full
control over temperature by heating or cooling, resulting in
a comfortable environment for your livestock.
The MST-5 provide the next features:
•Compatible with 2 speed motors
•Hi / Lo temperature recall
•Timer on first stage non active above the set point
•Timer for drip cool unit
•Automatic temperature ramping
•Adjustable differential for cooling and heating stages
The MST-5 provides microprocessor control over a five
stage output.
The first stage controls a single speed fan or the first
speed of a 2 speed motor. The stage also includes a
programmable duty cycle and adjustable timer setting.
The second stage provides control over a second single
speed fan or the second speed of a 2 speed fan.
The third stage provides control over a third fan or the first
speed of a 2 speed fan. The third stage can be used for a
drip cool unit with an adjustable timer setting.
The fourth stage controls a heater for cooler climates or a
fourth single speed fan or the second speed of a double
speed fan.
CHAPTER 1 - INTRODUCTION
www.monitrol.com

Page 6
MST 5
DESCRIPTION CONTINUED...
The fifth stage controls another heater for colder
climates or an other single speed fan.
The MST-5 provides you with full control over all five
stages via the use of an easy to follow display panel. All
programmable features can be customized to meet
your requirements. The MST-5 keeps you constantly
informed by displaying the status of all of its outputs as
well as the ambient temperature.
Safety of livestock is ensured by the continuous control
of climate and timely alarm notification should
environmental conditions exceed alarm set points.
Further security may be obtained by connecting all MST
series controls in a network configuration to a computer
via the use of an optional RCM 40 remote monitoring
unit. This provides remote control monitoring of each
room.
The MST-5 provides an constant automatic
temperature reduction (ramping) feature for your
maturing livestock. A built in low temperature safety
factor prevents temperatures from reaching dangerous
limits.
With MST-5 controlling of your climate, you are assured
of optimal living conditions for your livestock.
www.monitrol.com

Page 7
MAIN SET POINT
The desired room temperature. Other temperature
settings on the MST-5 are relative to the main set point
temperature.
RELATIVE TEMPERATURE
A value added to or subtracted from the main set point
which results in a new temperature at which a desired
action starts or stops.
ROOM TEMPERATURE
The actual temperature of the room.
RAMPING
An automatic daily reduction in the main set point and
all temperature settings relative to this.
DIFFERENTIAL
ON/OFF (relay). Range of temperature where two
conditions are possible. The output depends on
whether the temperature was increasing or decreasing
when it enters that range. The differential helps to avoid
frequent starts and stops of the actuator when
temperature is close to the relative set point.
DRIP COOL
Cooling system using evaporation to cool down
livestock.
DEFINITION OF TERMS
www.monitrol.com

Page 8
MST 5
www.monitrol.com

Page 9
Chapter 2 describes the installation of the MST-5 control.
2.1 UNPACKING
Unpack the MST-5 and inspect contents for damage.
Should the contents appear to be damaged, contact your
local distributor to return the material.
The package should contain the following standard items:
•1 MST-5 control
•1 installed temperature probe (model number 2004-1K)
•1 User’s manual
The following optional items may be included:
•3 additional temperature probes for temperature
averaging.
2.2 MOUNTING
The manufacturer recommends to closely observe the
following installation procedure, and that all work be
performed by a certified electrician. Failure to do so may
void the warranty!
CHAPTER 2 - INSTALLATION
To limit the unit’s exposure to noxious gases install the
unit in a hallway.
Make sure the unit is mounted right, side up with the
cable entry holes facing down.
The MST-5 will operate in a temperature range of 32°F to
120 °F (0 °C to 50 °C).
The enclosure is watertight, but it is not splash proof or
immersion proof. DO NOT WATER the control. Cover the
control carefully with plastic when you are cleaning the
room.
It is prohibited to use overhead cables outside the
building.
www.monitrol.com

Page 10
MST 5
Use a screwdriver to remove the faceplate and the plate
of the power compartment.
Install mounting screw on wall and hang the unit in place
by sliding the rear mounting hole of the MST-5 over the
screw.
Use two more screws to secure the MST-5 in place using
the bottom mounting hole.
2.3 SWITCH SETTINGS
The MST-5 is configured for a variety of options via two
switches as follows:
2.3.1 - Line Voltage Selector Switch
This switch is located on the surface of the main (bottom)
board and adapts the MST- 5 for 115 VAC or
230 VAC line voltage.
Refer to Figures 1, and 2.
2.3.2 - Software Settings Switch
This switch is located at the rear of the MST-5 faceplate
and adjusts the following options.
Switch 1 Selects between a Fahrenheit or Celsius
display on the front panel.
Switch 2 Locks/unlocks user settings. All settings
except for main set point, record low, and
record high temperature are locked while this
switch is off.
Mounting hardware is not shipped with the unit.
230V
115V
OFF ON
Fahrenheit
Settings locked
Stages 1 & 2 = Double Speed
Stages 3 & 4 = Double Speed
Celsius
Settings unlocked
Stages 1 & 2 = Single Speed
Stages 3 & 4 = Single Speed
OFF ON
1
2
3
4
www.monitrol.com

Page 11
Switch 3 Stage 1 & 2 for two singles speed fan or for
one double speed fan.
Switch 4 Stage 3 & 4 for two singles speed fan or for
one double speed fan.
2.4 CONNECTION PROCEDURE
For the connection procedures which follow refer to figures
1 and 2.
2.4.1 - Input power
Use a screwdriver to remove cable knock-outs for the
installation of cabling to the MST-5.
2.4.1.1 - 115 VAC
Make certain that the line voltage selector switch is set
to 115 VAC. Connect the power cable to terminals 11 and
12 on the main (bottom) board, connect the ground wire to
terminal 13 on the main board.
2.4.1.2 - 230 VAC
Make sure that the line voltage selector switch is set to
230 VAC. Connect the power cable to terminals 11 and 12
on the main (bottom) board, connect the ground wire to
terminal 13 on the main board.
2.4.1.2 WIRING DIAGRAM
To use the MST-5 with single speed fans, refer to figure 1,
and to use with double speed fans, refer to figure 2.
Do not apply power to the MST-5 and all loads until all
connections have been completed!
CHAPTER 2 - INSTALLATION
www.monitrol.com

Page 12
MST 5
2.5 TEMPERATURE PROBES
Temperature probes use a “Class 2” low voltage circuit.
These cables (caliber #18AWG min) can be extended
up to a distance of 500 feet (150 meters). Single probe
temperature connection is illustrated in figure 3, while 4
temperature averaging probe connection is illustrated in
figure 4.
2.5.1 Single Temperature Probe
Install a single temperature probe in an area that best
reflects the overall room temperature. Connect the two
leads and the shield of the temperature probe to the
MST terminals labeled “Probe”, as indicated in figure 3.
2.5.2 Averaging (optional)
Four temperature probes are required to do
temperature averaging in larger rooms. Place the
probes in appropriate locations to best average the
room temperature. Refer to figure 4.
2.6 ALARM
The MST-5 provides a normally open and normally
closed dry contact for alarming low or high temperature
conditions. In addition, that same contact may be used
to signal a power failure. This contact may be
connected to an alarm system, or directly to a siren
and / or an auto-dialer.
Use shielded cabling for probes . Connect the shields
to the “SHLD” terminal. Failure to do so may result in
inaccurate readings!
Momentary power interruptions may trigger false
alarms! To avoid false alarming when the MST is
connected to an alarm system, install a time delay
relay between the MST and the alarm system.
www.monitrol.com

Page 13
CHAPTER 2 - INSTALLATION
2.7 POWERING UP
Before powering up the MST-5, attach the faceplate to the
casing of the MST-5 using the six screws previously
removed.
Set Selector knob to position (12).
Upon powering up, the unit will test it’s display by briefly
lighting all the segments of it’s LED display. Make sure
that all segments light up.
Following the LED display test, the unit displays the room
temperature.
If the temperature is not displayed, refer to the Trouble
Shooting section in the appendix of this manual.
Fig. 1
Wiring diagram for 3 single speed fans and 2 heating units.
www.monitrol.com

Page 14
MST 5
Fig. 2
Wiring diagram for 2 double speed fans and 1 heating unit.
4
Notes for Figures 1 and 2.
Power cut and protection devices in case of overload.
Connect the grounding wire to the ground terminal 13.
IMPORTANT Must be on a 15A separate circuit
of the MST. Make sure to disconnect power of the
source and all loads before wiring.
1
2
3
www.monitrol.com

Page 15
CHAPTER 2 - INSTALLATION
Fig. 3.
Probes and alarm wiring.
Fig. 4
Temperature average probe connection.
www.monitrol.com

Page 16
MST 5
Fig. 5
Main (bottom) Board: terminal blocks and ground connection.
www.monitrol.com

Page 17
CHAPTER 3
USER’S GUIDE
CHAPTER 3 - USER’S GUIDE
www.monitrol.com

Page 18
MST 5
www.monitrol.com

Page 19
The MST 5 front panel shown above features a LED
status window and two control dials which are
respectively used to select a function and adjust a setting.
LED STATUS WINDOW
The LED status window features a 3 digit LED display for
temperature in Fahrenheit or Celsius, and programmable
settings.
In addition, the LED status window displays the
operational status of stage 1 through 5 via six additional
LEDs (shown above in LED window). When illuminated,
each LED indicates that its respective fan or heater is
functioning. The sixth LED lights up to indicate a low or
high temperature alarm condition.
CONTROL DIALS
The center dial is the selector dial and is used to select
one of the control panel’s 12 primary or 7 secondary
functions. The dial located to the right of the selector dial
is the adjuster dial and is used to enter secondary
function mode and to adjust the setting of each function.
NOTE
CHAPTER 3 - USER’S GUIDE
The dip switch #2 must be ON to
allow you to change all settings.
www.monitrol.com

Page 20
MST 5
The 12 primary functions are:
•1 Main set point temperature
•2 Stage 1 duty cycle timer
•3 Stage 2 relative set point
•4 Stage 3 relative set point
•5 Stage 4 relative set point
•6 Stage 5 relative set point
•7 Temperature differential for cool stages
•8 Temperature differential for heat stages
•9 Ramping
•10 Record LO temperature
•11 Record HI temperature
•12 Room temperature display
Any one of these functions is selected by rotating the
selector dial to the corresponding number and associated
graphical image printed on the faceplate of the MST.
When primary functions 1 through 11 are selected, the
LED status window displays a blinking value. Function 12
displays room temperature.
The 7 secondary functions are:
•2 Stage 1 duty cycle period
•4 Drip cool duty cycle timer
•5 Stage 1 Heat / Cool
•6 Stage 2 Heat / Cool
•9 Ramping minimum temperature limit
•10 Low temperature alarm
•11 High temperature alarm
Select any one of these secondary mode functions by:
•rotating the Selector dial to (12)
•rapidly rotating the adjuster dial back and forth to enter
secondary mode.
•rotating the selector dial from function (12) to any
other function.
When secondary functions 2, 4 through 6, and 9 through
11 are selected, the status window displays a blinking
value along with a scrolling LED display. Selection of
function 12 removes the MST from the secondary function
mode.
www.monitrol.com