Tekmar Mixing Control 354 User Manual

Unoccupied mode
Connect (short circuit) terminals
UnO Sw — Com Sen (14 and 15) together.
Heat Demand signal
(a) -
switch the Heat demand switch to the "External (1 & 2)" position, and
supply a 24Vac signal to terminals
Heat Dem — Heat Dem (1 and 2),
(b) - switch the the Heat demand switch to the "Permanent" position.
3
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). Once the mixing valve is closed, the control enters the operating mode. Once in operating
mode, the control uses:
• an Outdoor Sensor 070 to continually monitor the outdoor temperature.
• an Universal Sensor 071 to continually monitor the system supply water temperature.
• Option, an Universal Sensor 071 to continually monitor the boiler return water temperature.
•
Option, Indoor temperature can be monitored through the use of;
(a) - a tekmar 2K RTU or Indoor Sensor 074 (switch selector switch to "Indoor Sensor" position) or;
(b) - a tekmar Zone Control (switch selector switch to "Zone Control" position)
• While monitoring all of these temperatures, the control recognizes the following temperature conditions and inputs and will
respond as described. During operation, the lights of the control will indicate operational status as illustrated.
Indoor Sensor 074 function Selector switch = Indoor Sensor
The control will monitor the indoor, outdoor and supply temperatures, and shift the Heating Curve (and the
WWSD point) up or down to fine adjust the system supply water temperature whenever the room temperature
is different than the setting of the Occupied dial. When switched into Unoccupied mode, the "Unoccupied"
light will come on, and the control will operate at the temperature of the Unoccupied dial setting.
2K RTU function Selector switch = Indoor Sensor
The control will monitor the indoor, outdoor and supply temperatures, and shift the Heating Curve (and the
WWSD point) up or down to fine adjust the system supply water temperature whenever the room
temperature is different than the setting of the RTU dial. The Occupied and Unoccupied dials are not
functional, and a setback RTU must be used if Unoccupied schedules are desired.
WWSD function
When WWSD occurs, the "WWSD" and "Closing" lights will come on, the mixing valve will
close and the boiler and pump will shut down. The control will continue to monitor the
outdoor and supply temperatures. Whenever 3 days pass, the mixing valve will be run open
and closed and then the pump will be cycled on for 15 seconds to help prevent seizing.
External
(1 & 2)
Permanent
Indoor Sensor
Zone Control
Boil
e
10%
Heat Demand
25%
tekmar Zone Control function Selector switch = Zone Control
The control will monitor the indoor temperatures of all zones, as well as the outdoor and supply
temperatures, and shift the Heating Curve (and the WWSD point) up or down to fine adjust the system supply
water temperature for whichever zone requires the hottest supply water. The pump relay is continuously
on when Zone Control is selected except during the valve and pump exercising period. The Occupied and
Unoccupied dials are not functional.
Valve and Pump Exercising
Exercising of the valve and pump is done to ensure long life of these components. Every three days the control checks to see if the
valve has been operated to the fully open and close positions. If the valve has been operated to these positions, the control continues
normal operation. If not, the control will open the valve to the fully open position and then return the valve to its previous position. If
the valve has not been closed in the last three days, the valve will also cycle fully closed and then return to its operating location.
Power
WWSD
Unoccupied
Min. Return
Max. Supply
Heat Demand
Boiler
Closing
Pump
Opening
Heat Demand light
may also be on
Unoccupied light
may also be on
External
(1 & 2)
Permanent
Indoor Sensor
Zone Control
Boil
e
10%
Heat Demand
25%
External
(1 & 2)
Permanent
Indoor Sensor
Zone Control
Boil
e
10%
Heat Demand
25%
Occupied/Unoccupied dial function
The control will monitor the outdoor and supply temperatures. The Occupied and Unoccupied dial settings become the WWSD point.
When the outdoor temperature is warmer than the setting of the Occupied dial, the control enters WWSD. When switched into
Unoccupied mode, the "Unoccupied" light will come on, and the control will operate at the temperature of the Unoccupied dial setting.
UnO
Sw
Com
Sen
18 19 20
Com
Sen
10K
Sen
2K
RTU
Sup
Sen
Out
Sen
Com
Sen
Ret
Sen
12 13
14
15 16 17
12
Dem
Dem
Heat
External
(1 & 2)
P
Zone Control
Boiler enabled
Heat Demand
25% open
()
Permanent
Boiler enabled
10% open
Heat Demand
Outdoor temperature cold enough to require heating
Occupied/Unoccupied dial, no Heat demand signal
When the outdoor temperature is colder than the WWSD point, the control will leave
WWSD. Whenever the control leaves WWSD, the "WWSD" light will go out and the
control will continue to monitor the outdoor and supply temperatures, but no further
control action will take place until there is a heat demand signal.
Unoccupied light
may also be on
Sequence of Operation
OR
Power
WWSD
Unoccupied
Min. Return
Max. Supply
Heat Demand
Boiler
Closing
Pump
Opening

Tekmar Mixing Control 354 Specifications

General

Brand	Tekmar
Model	Mixing Control 354
Category	Controller
Language	English