background image

5

Slow Acting Zone Valves with Thermal Motors  

 

When the DIP switch is set to 

Thermal Motor, the 368 assumes that slow acting zone

valves with thermal actuating motors are connected to the zone relays. With slow acting
zone valves, the 368 allows a 3 minute period for the first zone valve to open before the
Heat Required light is turned on. The total operating time for the zone relays is also
increased by an extra 2 minutes. This helps compensate for the longer opening versus
closing time of the slow acting zone valves. Once the last zone relay is turned off, the 368
purges the boiler for one minute by signaling to  the House Control to turn off the boiler
and keep the system pump operating.

UNOCCUPIED (NIGHT SETBACK)  

The 368 can be switched into UnOccupied mode through the built in 24 hr. Timer or by
closing an external switch or timer relay wired between the terminals 

UnO Sw — Com Sen

(11 & 13) on the control.

24 hr. Timer  



The 368 has a built in 24 hr. Timer which can be used to set a single UnOccupied event
during a 24 hour period. The 24 hr. Timer is activated by pushing the 

Start button at the

desired starting time for the UnOccupied period. The duration of the UnOccupied period
is then set using the 

UnOccupied Duration dial. Once the Start button is pushed, the Timer

Active light is turned on and the 368 enters the UnOccupied mode each day at the same
starting time. The 24 hr. Timer can be deactivated by pressing the 

Start button again. A

new UnOccupied period starting time can be selected by repeating the above procedure.

Note If an external switch is closed between the terminals 

UnO Sw — Com Sen

(11 & 13), the 24 hr. Timer is disabled. An external UnOccupied switch and the 24
hr. Timer should not be used at the same time.

UnOccupied Switch Input 

 

A switch or external timer with a dry relay contact output can be wired between the
terminals 

UnO Sw — Com Sen (11 & 13) on the 368. When the switch or relay contact

is closed, the 368 registers an UnOccupied signal. A tekmar Timer 031 is available which
can be programmed to provide individual UnOccupied schedules for each day of the week
with up to two separate UnOccupied events per day. For more information on the Timer
031 see the Data Brochure D 031.

UnOccupied Temperature  



When the 368 is in UnOccupied mode, the 

UnOccupied light is turned on and the

UnOccupied dial is used to set the desired temperature within the UnOccupied zones.

Note If the RTU dial for an UnOccupied zone is set below the 

UnOccupied dial, the 368

continues to use the RTU dial as the desired temperature within that zone.

Individual Zone Selection 

  

The DIP switch on the 368 is used to select which zones are switched into UnOccupied
mode. If the DIP switch for a specific zone is set to 

Occ / UnOcc, the zone is switched into

UnOccupied mode whenever the 368 receives an UnOccupied signal. If the DIP switch
for a specific zone is set to 

Occ. only, the zone remains in the Occupied mode at all times.

Optimum Start / Stop   



The Optimum Start / Stop feature is enabled when the DIP switch is set to 

Optimum

Start. The 368 turns on the Optimum Start / Stop light each time the first zone enters its
delay or recovery period. Either the tekmar Timer 031 or the built in 24 hr. Timer on the 368
can be used with the Optimum Start / Stop feature. The tekmar Timer 031 has a DIP switch
which must be set to 

Optimum Start / Stop in order to synchronize the timer with the 368

Optimum Start / Stop function. For more information on the Timer 031 consult the Data
Brochure D 031.

SYSTEM PUMP OPERATION 

The 

System Pump light is turned on every time the relay contact between terminals System Pmp — System Pmp (1 & 2) is closed. During

heating operation, the system pump operates whenever any zone requires heat. If thermal motor zone valves are used, the system pump
is held off for the first three minutes of the zone cycle in order to give the zone valve sufficient time to open. The system pump may also
operate for an additional purge period once the zone relays are turned off.

Pump / Valve Exercising  



The zone valves, zone pumps and system pump are exercised to help prevent corrosion from building up and subsequently jamming
the equipment. Every three days the 368 runs through the following exercising procedure.

UnOccupied

70

°

F

(21

°

C)

40
(4)

100

(38)

UnOccupied

Off

Optimum Start

Occ/UnOcc

Occ. only

Zone 1

1

2 3

4

SCHD

Su

T I M E

AMPM

UNOCC

OVR

Sa

Mo

WeTh Fr

Tu

1
2

Zo

Out

12

11

UnO

Sw

Com

Sen

13

Occupied

Optimum Start / Stop

UnOccupied

Timer Active

24 hr. Timer

0

12 hrs.

24

6

18

• Dial the desired duration of the
UnOccupied period.
• Press start button at the time of day
you want the UnOcc. period to begin.
Timer Active light turns on.

Start

UnOccupied

Duration

0 = always Occupied
24 = always UnOccupied

Slow acting
zone valve

Off

Thermal Motor

Содержание Tekmar Zone Control 368

Страница 1: ...8 70 F 21 C 40 4 100 38 UnOccupied 5 6 7 LR 58223 NR T L C R Occupied Optimum Start Stop UnOccupied Timer Active 24 hr Timer 0 12 hrs 24 6 18 Dial the desired duration of the UnOccupied period Press s...

Страница 2: ...eat can be supplied to the room on the coldest day of the year without requiring that the room be cold Derivative D In order to speed up the control s response to quick changes in the heating load der...

Страница 3: ...ulationsonindoortemperatureonly Iftherearelargevariationsinoutdoor temperature this method cannot provide the same level of accuracy as when both indoor and outdoor sensors are used Optimum Start Stop...

Страница 4: ...relay is then turned on and its on time is increased as the load increases When the heating load decreases again the on time of the Hi stage relay is reduced until the Hi stage relay is turned off co...

Страница 5: ...cupied mode the UnOccupied light is turned on and the UnOccupied dial is used to set the desired temperature within the UnOccupied zones Note If the RTU dial for an UnOccupied zone is set below the Un...

Страница 6: ...ng hardware and conduit fittings Before removing the knockouts check the wiring diagram and select those sections of the chamber with common voltages Do not allow the wiring to cross between sections...

Страница 7: ...RTU 3 and RTU 4 If the common block is used for a Two Stage heating zone connect the RTU or Indoor Sensor to terminals Com Sen RTU 4 8 and 10 Output Connections System Pump Connect the live L side of...

Страница 8: ...plied by the manufacturer If a zone pump or valve is connected to the terminals Com 1 2 2 15 and 17 follow a similar procedure as described above for the zone 1 relay If a zone pump or valve is connec...

Страница 9: ...ic motor zone valves or zone pumps are used the DIP switch must be set to Off Testing the Control Functions STEP SEVEN OPERATIONAL TEST OF CONTROL FUNCTIONS The Zone Control 368 has a test routine whi...

Страница 10: ...g system is turned off during the final stages of the Occupied period Timer Active The timer is set to enter the UnOccupied mode every 24 hours at the time of day the Start button was pressed STEP EIG...

Страница 11: ...m Start Stop UnOccupied Timer Active Power Heat Required Occupied Optimum Start Stop UnOccupied Timer Active RTU 1 Temperature sensor open Power Heat Required Occupied Optimum Start Stop UnOccupied Ti...

Страница 12: ...cable environmental health or safety legislation No implied warranties shall extend beyond twenty four 24 months from the production date Some states or provinces do not allow limitations on how long...

Отзывы: