Varifan MST-1 User manual

MST-1
USER’S MANUAL
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MST-1
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.
WARNINGS 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 twice a year.
Fuse verification and replacement, as well as the proper
setting of control values shall be the responsibility of the
owner of this equipment.
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CHAPTER 1 - INTRODUCTION
1. General ...............................................................................5
1.1 Description...........................................................................5
Definition of terms.............................................................................7
CHAPTER 2 - INSTALLATION
2.1 Unpacking............................................................................9
2.2 Mounting ...........................................................................10
2.3 Switch Settings ..................................................................10
2.3.1 Line Voltage Selector Switch.............................................10
2.3.2 Software Settings Switch...................................................11
2.4 Connection Procedure.......................................................11
2.4.1 Input Power........................................................................11
2.4.1.1 115 VAC.............................................................................11
2.4.1.2 230 VAC.............................................................................12
2.4.2 Stage 1...............................................................................12
2.5 Temperature Probes..........................................................12
2.5.1 Single Temperature Probe.................................................12
2.5.2 Averaging...........................................................................12
2.6 Alarm..................................................................................13
2.7 Powering Up ......................................................................13
CHAPTER 3 - USER’S GUIDE
LED Status Window...........................................................17
Control Dials ......................................................................17
PRIMARY FUNCTIONS
Main Set Point Temperature..............................................19
Stage 1 Differential ............................................................20
Stage 1 Duty Cycle timer...................................................21
TABLE OF CONTENTS
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MST-1
CONTENTS CONTINUED...
Ramping ............................................................................ 22
Record Low Temperature.................................................. 23
Record High Temperature ................................................ 24
Ambient Room Temperature Display ................................ 25
SECONDARY FUNCTIONS
Heating or cooling mode.................................................... 26
Duty cycle period............................................................... 27
Minimum Ramping............................................................. 28
Low Temperature Alarm.................................................... 29
High Temperature Alarm ................................................... 30
APPENDIX
Troubleshooting.............................................................................. 31
Specifications.................................................................................. 32
Record Form................................................................................... 33
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CHAPTER 1 - INTRODUCTION
1. GENERAL
This document provides a description of the MST-1 control
panel. This document is organized as follows:
• Introduction
• Installation
• User’s Guide
• Appendix
1.1 DESCRIPTION
Congratulations on the purchase of your MST-1
environmental control system. The MST-1 product line
provides you with full control over temperature, air flow,
and heat resulting in a good air quality.
The MST product line offers these features:
• Heating or cooling mode
• Hi/Lo temperature indication.
• Automatic temperature reduction (ramping).
• Computer compatible with RCM-40.
The MST-1 provides microprocessor control over a single
stage output.
This stage controls a single speed fan or a heater. To cool
the room when the temperature is higher than the main set
point, use the MST-1 in cooling mode. Or to heat the room
when the temperature is lower than the main set point, use
the control in heating mode. In addition, the first stage may
be programmed to cycle on and off.
CHAPTER 1 - INTRODUCTION
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MST-1
DESCRIPTION CONTINUED...
The MST-1 provides you with full control over one stage
via the use of an easy to follow display panel. All
programmable features can be customized to meet your
requirements. The MST-1 keeps you constantly informed
by displaying the status of all of its outputs as well as the
ambient temperature.
Air quality 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 control panel
output is fused, and all programmable settings are
maintained whether or not the MST-1 is powered.
The MST-1 provides an automatic constant temperature
reduction (ramping) feature for your maturing livestock. A
built in low temperature safety factor prevents
temperatures reaching dangerous limits.
With MST-1 in control of your climate, you are assured of
good air quality.
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MAIN SET POINT
The desired room temperature. Other temperature settings
on the MST-1 are relative to the main set point
temperature.
AMBIENT TEMPERATURE
The actual temperature of the room.
RAMPING
An automatic daily reduction in the main set point and all
temperature settings relative to this.
CHAPTER 1 - INTRODUCTION
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MST-1
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CHAPTER 2 - INSTALLATION
2.1 UNPACKING
Unpack the MST-1 from its box and inspect contents for
damage. Should the contents appear to be damaged,
contact your local distributor for return material procedures.
The package should contain the following standard items:
• 1 MST-1 control .
• 1 installed temperature probe (model number
2004-1KLT).
• 2 cable fasteners or fuses.
• 1 User’s manual.
The following optional items may be included:
• 3 additional temperature probes for temperature
averaging,
• 1 special temperature probe (model number 2001-
1KHT).
The manufacturer recommends that the installation
instructions which follow be adhered to as closely as
possible, and all work be performed by a certified
electrician. Failure to do so may void the warranty!
CHAPTER 2 - INSTALLATION
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MST-1
2.2 MOUNTING
Mount the MST-1 to the wall using the mounting holes
located on the flange of the control housing.
Once the MST-1 is in place, use a screwdriver to remove
the four screws holding the faceplate to the housing.
2.3 SWITCH SETTINGS
The MST-1 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 control panel for 115 VAC or 230
VAC line voltage.
Refer to Figures 1, and 2.
To limit the unit’s exposure to noxious gases install the
unit in a hallway.
Make certain that the unit is mounted right side up with
the cable entry holes facing down.
The MST-1 will operate in a temperature range of 32°F -
120 °F (0 °C - 50 °C).
The enclosure is watertight, 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.
Mounting hardware is not shipped with the unit.
230V
115V
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2.3.2 - Software Settings Switch
This switch is located at the rear of the control panel
faceplate and adjusts the following options.
1
2
3
4
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
are locked while this switch is off.
Switch 3 Non active: Timer operates normally.
Active: Timer operates at 100% when
temperature reaches 4°F (2°C)
above the main set point. In this
case, the temperature will decrease
faster to the main set point (Heat,
inverse logic).
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-1.
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 3 and 4
on the main (bottom) board.
OFF ON
Fahrenheit
Settings locked
Timer override active
Not used
Celsius
Setting unlocked
Timer override non active
Not used
Do not apply power to the MST-1 until all connections
have been completed!
OFF ON
CHAPTER 2 - INSTALLATION
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MST-1
2.4.1.2 - 230 VAC
Make certain that the line voltage selector switch is set
to 230 VAC. Connect the power cable to terminals 3 and 4
on the main (bottom) board.
2.4.2 - Stage 1 (terminals 5 and 6)
Connect the two leads from Stage 1 to terminals 5 and 6
on the main (bottom) board.
2.5 TEMPERATURE PROBES
Temperature probes use a “Class 2” low voltage circuit.
These cables (#18AWG) can extend up to a distance of
500 feet (150 meters). For probe longer than 10 feet
(3 meters), install shielded wire #18AWG min. With the
shield grounded to ground of power source. Single probe
connections. Single temperature probe connections are
illustrated in Figure 3 while temperature averaging
connections are illustrated in Figure 4.
2.5.1 Single Temperature Probe
Install a single temperature probe in an area that best
reflects the overall temperature of the room. Connect the
two leads and the shield of the temperature probe to the
MST-1 terminals labelled “Probe” as indicated in Figure 3.
2.5.2 Averaging (optional)
Four temperature probes are required if temperature
averaging is desired in larger rooms. Place the probes in
appropriate locations to best average the ambient
temperature. Refer to Figure 4.
Use shielded cabling for probes when their cable paths
run parallel to high voltage wires. Connect the shields to
the ground of power source. Failure to do so may result
in inaccurate readings!
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2.6 ALARM
The MST-1 provides a normally open and normally closed
dry contact for alarming low or high temperature
conditions. In addition, this same contact can be used to
signal a power failure. This contact may be connected to
an alarm system, or directly to a siren and/or auto-dialer.
Make normally open or normally closed connections as
indicated in Figure 3.
2.7 POWERING UP
Before powering up the MST-1, attach the faceplate to the
casing of the MST-1 using the four screws previously
removed.
Set Selector knob to position (12).
Upon power up, the unit will test it’s display by briefly
lighting all the segments of it’s LED. Make certain that all
segments light.
Following the LED display test, the unit displays the
ambient temperature of the room.
If the temperature is not displayed, refer to the Trouble
Shooting section in the appendix of this document.
Momentary power interruptions may trigger false alarms!
To avoid false alarming when the MST-1 is connected to
an alarm system, install a time delay relay between the
MST-1 and the alarm system.
CHAPTER 2 - INSTALLATION
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MST-1
Fig. 1
Wiring diagram for One Fan
Fig. 2
Wiring diagram for One heating unit
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Note for figures 1, and 2
Power cut and protection devices in case of overload.
1
Fig. 3.
Temperature Probe and Alarm Wiring
CHAPTER 2 - INSTALLATION
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MST-1
Fig. 4
Temperature Averaging Probe Connection
Fig. 5
Main Board: Terminal, Blocks, Switches and Fuses.
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CHAPTER 3 - USER’S GUIDE
The MST-1 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 readout for
the display of temperature in Fahrenheit or Celsius and
programmable settings.
In addition, the LED status window displays the operational
status of Stage 1 via one LED (shown above in LED win-
dow). When illuminated, the LED indicates that the stage
is operating. The second LED lights 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 7 primary or 5 secondary
functions. The dial located to the right of the Selector dial is
the Adjustor dial and is used to enter secondary function
mode and to adjust the setting of each function.
CHAPTER 3 - USER’S GUIDE
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MST-1
The 7 primary functions are:
• 1 Main set point temperature
• 2 Stage 1 differential temperature
• 3 Stage 1 duty cycle
• 9 Ramping
• 10 Record low temperature display
• 11 Record high temperature display
• 12 Ambient 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 panel.
When primary functions (1 through 3) and (9 through 11)
are selected, the LED status window displays a blinking
value. Function 12 displays ambient temperature.
The 5 secondary functions are:
• 2 Stage 1 Heating or cooling mode
• 3 Duty cycle period
• 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 Adjustor dial back and forth to enter
secondary mode.
• rotating the Selector dial from function (12) to any
other function.
When secondary functions 2 and 3, 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-1 from the secondary function mode.
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PRIMARY FUNCTIONS
MAIN SET POINT
The main set point establishes the target
temperature in the building. This value is used
as the reference point for other settings. The
main set point temperature is adjusted in 0.5
degree increments from a minimum setting of
13.5°F (-9.5°C) to a maximum setting of 105.0°
F (41.0°C).
Adjusting the main set point temperature:
• rotate the Selector dial to position (1),
• rotate the Adjustor dial counterclockwise to
decrease the temperature setting,
clockwise to increase it.
The main set point temperature is displayed on
the MST-1.
Note: The ramping feature (primary
function 9) must be (OFF) to adjust the
main set point.
CHAPTER 3 - USER’S GUIDE
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MST-1
STAGE 1 DIFFERENTIAL
In order to minimize erratic behavior of Heater /
Fan 1 when ambient room temperature is
exactly at the relative set point, the differential
setting separates this ON / OFF threshold into
two: one ON threshold and one OFF. This
feature greatly reduces equipment wear.
The temperature difference between the two
thresholds is the differential.
The differential is adjusted in 0.5 degree
increments from a minimum setting of 0.5°F
(0.5°C) to a maximum setting of 10°F (5°C)
degrees.
Adjusting the differential setting:
• rotate the Selector dial to position (2),
• rotate the Adjustor dial counterclockwise to
decrease the differential setting, clockwise
to increase it.
The differential setting is displayed on the
MST-1.
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