Tekmar Mixing Control 354 Data Brochure
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Tekmar Mixing Control 354 Data Brochure

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- Data Brochure
Mixing Control 354
Power
Heat Demand
WWSD
Unoccupied
70°F
70°F
(21°C)
(21°C)
Min. Return
Max. Supply
35
105
35
105
(2)
(41)
(2)
(41)
Pump
Occupied
Unoccupied
Boiler
Closing
Opening
Mixing Control 354
Floating Action
System is
System is in
switched to
Warm Weather
Unoccupied
Shut Down
Control is
maintaining
Minimum Return
Control is
maintaining
Maximum Supply
Occupied
temperature
setting
Unoccupied
temperature
setting
Pump is on
Boiler is on
Terminal Plugs:
Power and out-
put connections
Input:
Heat Demand
signal
24Vac
power
supply
Output: Turn on
pump
Output: Open / Close
Mixing Valve
The tekmar Mixing Control 354 is a microprocessor-based control with a floating action output
intended to operate a mixing valve. This valve regulates the supply water temperature to a heating
system based on the outdoor air temperature, and optionally, the indoor air temperature. The
pump is shut down and the valve is closed when there is no Heat Demand signal or when the
outdoor temperature is warm enough so that the system no longer requires heat (WWSD). The
pump runs continuously when a zone control is selected. Maximum supply temperature and
minimum boiler return temperature can be constrained for protection of system components.
Outdoor Reset Strategy. . pg. 2
Sequence of Operation . . pg. 3
Installation . . . . . . . . . . . . pg. 5
Settings . . . . . . . . . . . . . . . pg. 8
Heating
is required
70°F
70°F
(21°C)
(21°C)
35
105
35
105
(2)
(41)
(2)
(41)
Occupied
Unoccupied
Mixing Control 354
Floating Action
24 V (ac) only
1
2
3
4
5
6
Heat
Power
Pump
Dem
Dem
C
R
M
Output:
Turn on boiler
Test button and
24Vac power
LED to test main
supply is on
control functions
External
(1 & 2)
Power
Heat Demand
Heat Demand
Heat Demand
Permanent
WWSD
Unoccupied
Minimum Return
Maximum Supply
Pump
Boiler
T est
Closing
Opening
Made in Canada by
tekmar Control Systems Ltd.
Power
Pump Relay
Boiler Relay
Mix Relay
Do not apply power here!
7
8
9
10 11
12
13 14
Com Opn Cls
Ret
Com
Mix
Mix Mix
Boiler
Sen
Sen
Input: Return
Sensor 071
Input: Unoccupied
Testing . . . . . . . . . . . . pg. 9
Error Messages . . . . . pg. 11
Technical Data . . . . . . pg. 12
Limited Warranty . . . . pg. 12
Operating Mode
selector switches
Zone Control
25% open
Boiler enabled
1
3
2
10% open
Indoor Sensor
150°F
2.0
190
0.4
3.6
100
Off
Heating Curve
Max. Supply
100°F
140 sec.
60
Off
150
30
250
Minimum
Motor
Boiler Return
Speed
Jun 95
1234567
24 V 50/60 Hz 3 VA
120 V (ac) 10 A 1/3 hp, pilot duty 240 VA 2 A
120 V (ac) 10 A 1/3 hp, pilot duty 240 VA 2 A
120 V (ac) 6 A 1/4 hp, pilot duty 240 VA 2 A
15
16 17
18 19 20
UnO
Com
10K
2K
Com
Sup Out
Sw
Sen
Sen RTU
Sen
Sen
Sen
Input: Outdoor
Input: Supply
Universal Sensor 071
Included
signal. or
Input: Indoor
Timer 030
Sensor 074
D 354
08/95
Heating Curve
setting
Maximum Supply
temperature
setting
Actuating
Motor Speed
setting
Minimum Boiler
Return tempera-
ture setting
Valve is closing
Valve is opening
Terminal Plug:
Sensor and
timer input
Sensor 070
Included
O
R
Input: 2k RTU

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Summary of Contents for Tekmar Mixing Control 354

  • Page 1 Mixing Control 354 08/95 The tekmar Mixing Control 354 is a microprocessor-based control with a floating action output intended to operate a mixing valve. This valve regulates the supply water temperature to a heating system based on the outdoor air temperature, and optionally, the indoor air temperature. The...
  • Page 2 A very warm room temperature can shift the curve far enough down to put the control into WWSD at cool outdoor temperatures. Refer to the tekmar Essays E 001 and E 002 for more detailed information regarding control strategy and integration of control functions.

  • Page 3: Sequence Of Operation

    Sequence of Operation When the Mixing Control 354 is powered-up, the "Power" light will come on and the control will turn on all LED's for five seconds. If no errors are detected, the control closes the mixing valve for the time set on the Motor Speed dial (this is the last step of the test program, see page 11).
  • Page 4 See Brochure A 354. Caution: The tekmar Mixing Control 354 is an operating control and is not certified or intended for use as a primary safety device. Under normal operating conditions, the control will provide excellent protection against excessive supply temperatures and low boiler return temperatures, however, if failsafe protection against either of these conditions is essential then separate certified safety limit devices should be employed.

  • Page 5: Installation

    Check the contents of this package. If any of the contents listed are missing or damaged, please refer to the Limited Warranty and Product Return Procedure on the back of this brochure and contact your wholesaler or tekmar sales agent for assistance.
  • Page 6 • Connect the power supply for the actuating motor to terminal Com Mix (7). Maximum 24 Volts If a tekmar Actuating motor 010 is used , a 24Vac 12VA power supply for the control is adequate for operating the motor. Install a jumper wire between 10 11 terminal Power R (4) and Com Mix (7).
  • Page 7 Caution The tekmar Mixing Control 354 is an operating control and is not certified or intended for use as a safety device. Under no circumstances should safety limit devices be left disconnected after installation of this control. The installer shall check all applicable code requirements and obtain necessary inspections to ensure that the installation is in compliance with those requirements.
  • Page 8 For specific application details refer to Brochures A 354. A more detailed technical description of the effect of control settings on overall system operation is described in the tekmar Essay, E 002. Heating Curve As outdoor temperatures drop, heat losses from a space become greater and the heating system supply water temperature must be raised to maintain a constant room temperature.
  • Page 9 Speed setting is essential for proper valve and boiler operation. The tekmar Actuating Motor 010 takes 210 seconds to move from the fully closed to the fully open position and the Motor Speed dial on the control is labeled with a mark indicating the correct position.
  • Page 10 Operational test of control functions - Test button The Mixing Control 354 has a Test button which can be used to test all of the main control functions at any time. When the Test button is pushed, the control automatically runs through the following test procedure. If a fault in a sensor occurs, the lights will flash an error message and the test routine will be exited until the fault is located and corrected.

  • Page 11: Troubleshooting

    Power light on — Test light on — Closing light on Heat Demand The control turns off the boiler and pump and turns on the close relay for the time span set on Power light may Heat Demand the Motor Speed dial. also be on WWSD If the Test Button is pushed once during the time the valve is driving closed, the The "Test"...

  • Page 12: Technical Data

    This warranty is in lieu of all other warranties, express or implied, including, without limitation, warranties of merchantability, fitness for The liability of tekmar shall be limited to the cost of parts and labour a particular purpose, durability or description of the product, its non-...

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