manualshive.com logo in svg

Varifan MST-5, User Manual, Page: 28 / 44

Share
Download
Varifan MST-5 User Manual Download Page 28

  

Page 28                  

    MST 5 

 
 

 

DIFFERENTIAL HEAT STAGES 

 
 
 
In order to minimize erratic behavior of all 
stages in heating mode when 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 called 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 for heat stage 
setting:

 

•

rotate the selector dial to position (8), 

•

rotate the adjuster dial counterclockwise to 
decrease the differential setting, and 
clockwise to increase it. 

 
The differential setting is displayed on the  
MST-5. 

 

www.monitrol.com

Summary of Contents for MST-5

Page 1: ...l rel rel MST 5 1 2 3 4 5 S T A G E 2 S T A G E 3 ST A G E 4 reduc per day COOL HEAT COOL HEAT A L A R M ALARM 5 STAGE THERMOSTAT computer compatible ADJUST Varifan TIMER on off PER IO D L IM I T COOL STAGES H E A T S TAGES STAGE 5 T I M E R www monitrol com ...

Page 2: ... 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 d...

Page 3: ... 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 ...

Page 4: ...ure 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: ... 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 seco...

Page 6: ...he 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 reduct...

Page 7: ...re 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 clos...

Page 8: ...Page 8 MST 5 www monitrol com ...

Page 9: ... 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 ...

Page 10: ...m 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 temperat...

Page 11: ...ch 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...

Page 12: ...r 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...

Page 13: ...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: ...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: ...Page 15 CHAPTER 2 INSTALLATION Fig 3 Probes and alarm wiring Fig 4 Temperature average probe connection www monitrol com ...

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

Page 17: ...Page 17 CHAPTER 3 USER S GUIDE CHAPTER 3 USER S GUIDE www monitrol com ...

Page 18: ...Page 18 MST 5 www monitrol com ...

Page 19: ...onal 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 adjuste...

Page 20: ...ugh 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 t...

Page 21: ...om 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 Adjuster dial counterclockwise to decrease the temperature setting and clockwise to increase it The main set point temperature is displayed on the MST 5 Note The ramping feature primary function 9 must be OFF to adjust the main set p...

Page 22: ...function 2 in secondary mode The stage 1 duty cycle is adjusted in 5 increments from a minimum setting of OFF 5 10 etc up to a maximum setting of ON corresponding to continuous operation Adjusting the duty cycle of Stage 1 rotate the selector dial to position 2 rotate the adjuster dial counterclockwise to decrease the duty cycle and clockwise to increase it The duty cycle is displayed on the MST 5...

Page 23: ...0 0 C to a maximum setting of 32 0 F 16 0 C Adjusting the relative set point of stage 2 rotate the selector dial to position 3 rotate the adjuster dial counterclockwise to decrease the relative set point and clockwise to increase it The stage 2 relative set point is displayed on the MST 5 Example A main set point of 70 F along with a stage 2 relative set point of 2 F is selected When the room temp...

Page 24: ...a minimum setting of 0 0 F 0 0 C to a maximum setting of 32 0 F 16 0 C Adjusting the relative set point of stage 3 rotate the selector dial to position 4 rotate the adjuster dial counterclockwise to decrease the relative set point and clockwise to increase it The stage 3 relative set point is displayed on the MST 5 Example A main set point of 70 F along with a Stage 3 relative set point of 4 F is ...

Page 25: ...a maximum setting of 32 0 F 16 0 C Adjusting the stage 4 relative temperature rotate the selector dial to position 5 rotate the adjuster dial counterclockwise to decrease the relative set point and clockwise to increase it The stage 4 relative set point is displayed MST 5 CHAPTER 3 USER S GUIDE Example The main set point temperature is adjusted to 70 F A heater is in use and the relative set point...

Page 26: ...ncrements from a minimum setting of 15 0 F 10 0 C to a maximum setting of 32 0 F 16 0 C Adjusting the Stage 5 relative temperature rotate the selector dial to position 5 rotate the adjuster dial counterclockwise to decrease the relative set point and clockwise to increase it The stage 5 relative set point is displayed MST 5 Example The main set point temperature is adjusted to 70 F A heater is in ...

Page 27: ...he temperature difference between the two thresholds is called 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 for cool stage setting rotate the selector dial to position 7 rotate the adjuster dial counterclockwise to decrease the differential setting and clockwise to in...

Page 28: ...quipment wear The temperature difference between the two thresholds is called 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 for heat stage setting rotate the selector dial to position 8 rotate the adjuster dial counterclockwise to decrease the differential setting and ...

Page 29: ... ramping rate and clockwise to decrease it The ramping setting is displayed on the MST 5 NOTE When ramping is activated the main set point temperature cannot be manually adjusted Ramping automatically shuts OFF when the minimum temperature limit is reached Example The main set point temperature is set to 70 F and ramping is adjusted to 0 05 F The following day the main set point temperature drops ...

Page 30: ...rom a minimum display of 13 5 F 10 0 C to a maximum display of 105 0 F 41 0 C If a temperature lower than 13 5 F is recorded Lo is displayed Viewing the lowest temperature recorded rotate the selector dial to position 10 Clearing the low temperature value quickly rotate the adjuster dial counterclockwise then clockwise CLr will be briefly displayed on the MST 5 www monitrol com ...

Page 31: ...play of 13 5 F 10 0 C to a maximum display of 105 0 F 41 0 C If a temperature higher than 105 0 F is recorded Hi is displayed Displaying the highest temperature recorded rotate the selector dial to position 11 Clearing the high temperature value quickly rotate the adjuster dial counterclockwise then clockwise CLr will be briefly displayed on the MST 5 CHAPTER 3 USER S GUIDE www monitrol com ...

Page 32: ...is displayed to the nearest 0 1 degree from a minimum display of 13 5 F 10 0 C to a maximum display of 105 0 F 41 0 C If the temperature is lower than 13 5 F Lo is displayed If the temperature is higher than 105 0 F Hi is displayed Viewing the room temperature rotate the selector dial to position 12 Room temperature is displayed on the MST 5 www monitrol com ...

Page 33: ...d by 1 minute increments from a setting of 1 minute to a maximum setting of 10 minutes Adjusting the stage 1 duty cycle period rotate the selector dial to position 12 rapidly rotate the adjuster dial back and forth to enter secondary function mode rotate the selector dial to position 2 rotate the adjuster dial counterclockwise to decrease the period and clockwise to increase it The stage 1 period ...

Page 34: ...s entered as a percentage of a 12 minutes period If a fan is used set this value at 100 Adjusting the duty cycle setting rotate the selector dial to position 12 rapidly rotate the adjuster dial back and forth to enter secondary function mode rotate the selector dial to position 4 rotate the adjuster dial counterclockwise to decrease the duty cycle setting and clockwise to increase it The duty cycl...

Page 35: ...ting the stage 4 heating or cooling mode rotate the selector dial to position 12 rapidly rotate the adjuster dial back and forth to enter secondary function mode rotate the selector dial to position 5 rotate the adjuster dial counterclockwise to set the stage in heating mode and clockwise to to set it in cooling mode The heating or cooling mode is displayed on the MST 5 Cool Heat CHAPTER 3 USER S ...

Page 36: ...e display if you want to use the stage 5 in cooling mode Adjusting the stage 5 heating or cooling mode rotate the selector dial to position 12 rapidly rotate the adjuster dial back and forth to enter secondary function mode rotate the selector dial to position 6 rotate the adjuster dial counterclockwise to set the stage in heating mode and clockwise to to set it in cooling mode The heating or cool...

Page 37: ... setting rotate the Selector dial to position 12 rapidly rotate the Adjuster dial back and forth to enter secondary function mode rotate the Selector dial to position 9 rotate the Adjuster dial counterclockwise to decrease the minimum ramping setting clockwise to increase it The minimum ramping setting is displayed on the MST 5 Limit NOTE When the main set point temperature reaches the minimum ram...

Page 38: ...e alarm is adjusted in 0 5 degree increments from a minimum setting of 32 0 F 18 0 C to a maximum setting of 0 0 F 0 0 C Adjusting the low temperature alarm setting rotate the selector dial to position 12 rapidly rotate the adjuster dial back and forth to enter secondary function mode rotate the selector dial to position 10 rotate the adjuster dial counterclockwise to decrease the setting and cloc...

Page 39: ...m is adjusted in 0 5 degree increments from a minimum setting of 0 F 0 C to a maximum setting of 32 0 F 18 0 C Adjusting the high temperature alarm rotate the selector dial to position 12 rapidly rotate the adjuster dial back and forth to enter secondary function mode rotate the selector dial to position 11 rotate the adjuster dial counterclockwise to decrease the setting and clockwise to increase...

Page 40: ...ing and fan or heater Stage 4 and 5 Fan or Heater is operating erratically Verify that the function on position 5 and 6 in secondary mode is correctly adjusted Verify the minimum rating 10mA at 115V or 20mA at 230V Display is blank Verify that the line voltage selector switch is properly set Verify that the 10 pin flat cable between the main board and the faceplate board is connected TROUBLESHOOTI...

Page 41: ...30V STAGE 3 dry relay contact Not Fused 10 AMP 115V 230V 1 2 HP 115V 1 HP 230V Min Rating 10mA at 115V 20mA at 230V STAGE 4 dry relay contact Not Fused 10 AMP 115V 230V 1 2 HP 115V 1 HP 230V Min Rating 10mA at 115V 20mA at 230V STAGE 5 dry relay contact Not Fused 10 AMP 115V 230V 1 2 HP 115V 1 HP 230V Min Rating 10mA at 115V 20mA at 230V ALARM dry relay contact 2 AMP 30V AC DC SPECIFICATIONS APPEN...

Page 42: ... C 10 Lo Temperature Alarm 8 F 5 C 11 High Temperature Alarm 20 F 12 C RECORD FORM 2nd Function 1 Main Set Point Temperature 77 F 25 C 2 Stage 1 Duty Cycle Timer ON ON 3 Stage 2 Relative Set Point 4 F 2 C 4 Stage 3 Relative Set Point 6 F 3 C 5 Stage 4 Relative Set Point 8 F 4 C 6 Stage 5 Relative Set Point 10 F 5 C 7 Temperature Differential Heat Stage 2 F 1 C 8 Temperature Differential Cool Stage...

Page 43: ...ail lightning or any other natural disaster Any unauthorized work modification or repair on this product automatically voids the warranty and disclaims the manufacturer from all responsibility The manufacturer assumes only those obligations set forth herein excluding all other warranties or obligations This warranty stipulates that in all cases the manufacturer shall be liable only for the supply ...

Page 44: ...MAV MST 5M Ver 1 1 October 1995 Rev July 1997 Rev June 2001 www monitrol com ...

Reviews:

No comments