D 362 - Data Brochure Mixing Control 362 12/08 The Mixing Control 362 is a microprocessor based control with two distinct operating modes. MODE —1— allows the control to provide a reset mixed supply water temperature to a heating system based on outdoor air temperature. Multiple zone temperature controls can be achieved by using either a conventional thermostat system or by using tekmar Zone Controls attached to the 362.
How To Use The Data Brochure This brochure is organized into four main sections. They are: 1) Sequence of Operation, 2) Installation, 3) Control Settings, and 4) Troubleshooting. The Sequence of Operation section has four sub sections. We recommend reading Section A: General of the Sequence of Operation, as this contains important information on the overall operation of the control. Then read to the sub sections that apply to your installation.
Display Item Field Number Field Displays an abbreviated name of the selected item Displays the current value of the selected item View Adjust Monitor Menu Field Displays the current menu Schd Misc Open Close Aux % 1 °F °C min hr sec UnOcc Ovr 12 DHW Idling ! Status Field Displays the current status of the control’s inputs, outputs and operation Menu Mix Demand WWSD Minimum Maximum Melting { Item Buttons Selects Menus, Items and adjusts settings Symbol Description % 1 ! °F, °C, sec, m
Sequence of Operation Section A General Section B Page 4 - 5 Mode 1: Heating Page 5 - 9 Section C Mode 2: Snow Melting Page 9 - 13 Section D Boiler Operation Page 13 - 15 Section A —General Operation POWERING UP THE CONTROL When the Mixing Control 362 is powered up, the control displays the control type number in the LCD for 2 seconds. Next, the software version is displayed for 2 seconds.
MIXING TARGET TEMPERATURE (MIX TRG) (RESET RATIO & CHARACTERIZED HEATING CURVE) When in Mode 1, the MIX TRG temperature is determined from either the Characterized Heating Curve or the Reset Ratio settings and the outdoor air temperature. When in Mode 2, the MIX TRG temperature is determined from either the outdoor air temperature and the desired slab temperature or the Melting and Idling settings. The control displays the temperature that it is currently trying to maintain as the mixing supply temperature.
MIXING START (MIX STRT) (RESET RATIO) 210 MIX MAX (99) Mixing Reset Ratio MIX DSGN 170 (77) The OUT STRT temperature is the outdoor air temperature at which the control provides the MIX STRT supply water temperature to the system. OUTDOOR DESIGN (OUT DSGN) (RESET RATIO & CHARACTERIZED HEATING CURVE) k ac tb Se al rm No The OUT DSGN is the outdoor air temperature that is typically the coldest temperature of the year where the building is located.
ROOM OCC & UNOCC (ROOM) (CHARACTERIZED HEATING CURVE) MIXING TARGET TEMPERATURE (MIX TRG) (RESET RATIO & CHARACTERIZED HEATING CURVE ) The MIX TRG temperature is determined from either the Characterized Heating Curve or the Reset Ratio settings and the outdoor air temperature. The control displays the temperature that it is currently trying to maintain as the mixing supply temperature. If the control does not presently have a requirement for heat, it displays “- - -” in the LCD.
To provide greater energy savings, the 362 has a setback capability. With setback, the supply water temperature in the system is reduced when the building is not used (AWAY) or when the building is UnOccupied. By reducing the supply water temperature, air temperature in the space may be reduced even when thermostat(s) are not turned down. This feature is enabled by setting the Setback / None DIP switch to the Setback position, and providing either an external signal or an internal override.
Section B2: Alternate Mixing Demands (Mode —1—) In addition to using conventional thermostats to provide a mixing demand as described in Section B1, the 362 can use a number of other methods to provide a mixing demand. 10K INDOOR SENSOR (10K = INDR) Set the 10K item to INDR to add an indoor sensor for temperature control of a single zone mixing system. The indoor sensor is connected to the Com and 10K terminals (14 and 15).
NOTE: When operating in the Snow Melting mode, the Reset Ratio / Characterized Heating Curve DIP switch has no effect on the operation of the contro SLAB PROTECTION (∆T MAX) Boiler Sensor on the Return or No Boiler Sensor (NON-DEDICATED HEAT SOURCE) If the snow melting system is one of several loads on a boiler or boiler plant, the amount of heat available to the system can potentially damage the snow melting slab.
RUNNING TIME (RUN TIME) The running time is the length of time that the snow melting system operates once the slab has reached the melting temperature. During the time that the slab is approaching the melting temperature, the RUN TIME does not decrease. Once the slab has reached the melting temperature, the RUN TIME begins counting down. When the RUN TIME reaches 0:00 as displayed by the SNOWMELT item in the View menu, the 362 has finished Melting.
REMOTE START / STOP MODULE 039 A Remote Start / Stop Module 039 can be used to start and stop the snow melting system and adjust the running time. Refer to data brochure D 039 for details of operation. 7 8 9 REMOTE DISPLAY MODULE 040 A Remote Display Module 040 can be used to start and stop the snow melting system. The snow melting system is enabled by pressing the Up button on the 040 while in the View menu.
WARM WEATHER SHUT DOWN (WWSD) Since a slab sensor is not in use, the Warm Weather Shut Down is determined only from the outdoor air temperature. Once the outdoor air temperature rises above the WWSD setting, the control goes into a WWSD and ignores any demand for Idling or Melting. Also the word WWSD is displayed when viewing the SNOWMELT item in the View Menu.
DIFFERENTIAL Sequence, Section D1 Mode 1: Heating (Boil DIFF) When operating in Mode 1, an on / off heat source such as a boiler must be operated with a differential to prevent short cycling. This differential is centered around the Boil TRG temperature. If the boiler supply temperature drops 1/2 of the differential below the Boil TRG temperature, the 362 closes the boiler contact to fire the boiler.
Section D2: Boiler Return Sensor BOILER SENSOR ON THE RETURN (Boil SENS = RET) The boiler sensor should be located on the boiler return if the 362 is one of many controls that can call for boiler operation. When in the return mode, the 362 provides a boiler enable. The 362 no longer tries to control the boiler supply water temperature directly but allows the boiler to operate at its operating aquastat setting.
• If a Slab Sensor 072 or 073 is used, install the Slab Sensor according to the installation instructions in the Data Brochure D 070 and run the wiring back to the control or RTU. Sequence, Section E2 • If a Remote Display Module (RDM) 040 is used, install the RDM according to the installation instructions in the Data Brochure D 040 and run the wiring back to the control.
Mixing Valve Actuator Connect one side of the 24 V (ac) power to the Pwr Mix terminal (8) on the control. The output relay Opn (9) is then connected to the open terminal of the actuating motor and the output relay Cls / Var (10) is connected to the close terminal of the actuating motor. Connect the second side of the 24 V (ac) circuit to the common terminal of the actuating motor.
UnOccupied Switch 14 15 16 Com 10K UnO Sw If an external timer (tekmar Timer 032) or switch is used, connect the two wires from the external switch to the Com and UnO Sw terminals (14 and 16). When these two terminals are shorted together, the control registers an UnOccupied signal. Note: The setback override in the schedule menu of the control overrides any external signal that is present on the UnOccupied Switch terminals.
Boiler If the boiler is connected to the Boiler terminals (6 and 7), make sure power to the boiler circuit is off and install a jumper between the terminals. When the boiler circuit is powered up, the boiler should fire. If the boiler does not turn on, refer to any installation or troubleshooting information supplied with the boiler. (The boiler may have a flow switch that prevents firing until the boiler pump is running.) If the boiler operates properly, disconnect the power and remove the jumper.
DIP Switch Settings The DIP Switch settings on the control are very important and should be set to the appropriate settings prior to making any adjustments to the control through the User Interface. The DIP switch settings change the items that are available to be viewed and/ or adjusted in the User Interface. If a DIP switch is changed while the control is powered up, the control responds to the change in setting by returning the display to the View menu.
362 View Menu (1 of 1) Access Level Description Range •••• Current outdoor air temperature as measured by the outdoor sensor. This is also the default display for the control. -67 to 149˚F (-55 to 65˚C) B2 ••• Target room air temperature. “– – –” denotes no heat is required. 10K = INDR MODE = —1— - - -, 35 to 100˚F (2 to 38˚C) B2 •••• Measured room air temperature at the indoor sensor.
362 Adjust Menu (1 of 4) Access Level A C3 C4 Description U SE IN R ST AD V Se c ti LT on D Item Field •• ••• The operating Mode for the control. MODE 1 is for Heating. MODE 2 is for Snow Melting. C4 •• C1 •••• C1 •• B1 Occ B1 UnOcc B2 C3 C4 B2 B2 Copyright © D 362 -12/08 •••• ••• •• •• ••• •• —1— (Heating) —2— (Snow Melting) Default = —1— This item is the desired slab surface temperature while in the Melting Mode.
362 Adjust Menu (2 of 4) Access Level Description Range Actual Setting Se c ti LT on D US E IN R ST AD V Item Field B1 B1 B1 B1 B1 B1 B1 B1 B1 A B1 A •• The maximum length of morning boost. DIP switch = Characterized Heating Curve DIP switch = Setback No RTU Connected 10K ≠ ZoIn MODE = —1— ••• The amount the mixing supply temperature is reduced when the control is in the UnOccupied Mode.
362 Adjust Menu (3 of 4) Se ct i LT on D US E IN R ST AD V Item Field Access Level A Description Range •• The time that the actuating motor requires to operate from fully closed to fully open. MIXING = FLOT •• The location of the boiler sensor. This affects operation of the boiler contact. •• The maximum ∆T for the snow melting slab. Boil SENS ≠ SUP MODE = —2— • The maximum temperature allowed for the boiler target temperature.
362 Adjust Menu (4 of 4) Access Level Actual Setting Description Range • The maximum length of time that the mixing pump continues to operate after the mix demand is removed. OFF, 0:10 to 40:00 min • Enables or disables the Soft Start feature in the control. NONE, MIX MODE = —1— Default = NONE • The frequency with which the control exercises the pumps and valves that are operated by the control.
362 Misc (Miscellaneous) Menu (2 of 2) Access Level Description Range LT D US E IN R ST AD V Item Field The operating mode for the back lighting on the LCD as well as the time of keypad inactivity until the control automatically returns to the default display. BACKLITE = OFF (returns after 10 seconds) BACKLITE = 30 sec (returns after 30 seconds) BACKLITE = ON (returns after 90 seconds) ••• The access level that is to be used by the control.
362 RTU Adjust Menu (1 of 1) Access Level 2 3 06 06 •••••• B1 Occ •••••• B1 UnOcc Description Actual Setting Range US E IN R ST AD V R TU R TU Se c ti LT on D Item Field The desired room air temperature during an Occupied period for the mixing zones. Note: There is only a ±3°F adjustment in the LTD access level. The desired room air temperature during an UnOccupied period for mixing zones. Note: There is only a ±3°F adjustment in the LTD access level.
362 RTU Schd (Schedule) Menu (1 of 1) Access Level Item Field Description Range The type of setback override that is in effect.
Step 4 - The Boiler contact is turned on for 10 seconds. After 10 seconds, the Boiler and Mix Pmp contacts are shut off. NOTE: Only if there is a boiler demand can the control be paused in step 4. Step 5 - After the test sequence is completed, the word COMPLETE is displayed for 1 second and the control resumes its normal operation. MAX HEAT (MAX HEAT) The Mixing Control 362 has a function called Max Heat.
Sketch the Piping in the System Sketch the piping of the system. This is a relatively simple step that tends to be overlooked, however it can often save hours of time in troubleshooting a system. Note flow directions in the system paying close attention to the location of pumps, check valves, pressure bypass valves and mixing valves. Ensure correct flow direction on all pumps. This is also a very useful step if additional assistance is required.
362 Monitor Menu (2 of 3) Note: To clear the recorded Information in the specific item field, press and hold . Description Range LT D US E IN R ST AD V Item Field Access Level and •• The highest recorded temperature at the mixing sensor since this item was last cleared. -31 to 266˚F (-35 to 129˚C) •• The lowest recorded temperature at the mixing sensor since this item was last cleared.
362 Monitor Menu (3 of 3) Note: To clear the recorded Information in the specific item field, press and hold Access Level . Range E IN R ST AD V Description US LT D Item Field and • This item is an adjustable warning. If either the boiler or mixing supply temperature does not begin to increase within the set amount of time when required, the control will display a warning message.
362 Error Messages (2 of 4) Error Displayed Description of Error The RTU was unable to store a piece of information to the EEPROM. This error can be caused by a noisy power source to the control. The control will display the error message and will continue to operate as normal. To clear this error, press either the Menu or Item buttons. The RTU was unable to read a piece of information stored in the Adjust menu.
362 Error Messages (3 of 4) Error Displayed Description of Error The control is no longer able to read the Mixing Supply sensor due to an open circuit. In this case, if the Boil SENS item is set to SUP, the control will operate the mixing device at a fixed 15% of output as long as there is a Mixing Demand. If the Boil SENS item is set to RET or NONE, the control operates the mixing device at a fixed 30% of output as song as there is a Mixing Demand.
362 Error Messages (4 of 4) Error Displayed Description of Error The Remote Sensor 1 attached to the RTU is being read as an open circuit. The RTU will continue operation using all remaining sensors. If all of the sensors are unavailable, the control will continue to operate as if the RTU was not connected to the control. This error message can be cleared once the sensor has been repaired. Locate and repair the problem as described in the Data Brochure D 070.
Technical Data Mixing Control 362 Floating Action / Variable Speed — — — — — — Power supply Relays Var. Pump Demands Sensors included — — — — — Optional devices — D 362, A 362’s, D 001, D 070, E 003, E 021, U 362. Microprocessor PID control; This is not a safety (limit) control. 3.7 lb.
