Tekmar 368 Zone Control User Manual

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- Data Brochure
Zone Control 368
D 368
09/96
The Zone Control 368 is a microprocessor-based energy management control that uses PID
logic to control the temperature in up to 4 heating zones. Multiple zone controls can be
connected together for additional zones of heating. Either single stage or two stage zones can
be provided by the control. The 368 is primarily designed for use with the tekmar House
Controls. When connected to a House Control, the 368 provides indoor temperature feedback
that adjusts the supply water temperature in order to satisfy the zone with the highest heat
load. The 368 also coordinates the zoning operation in order to minimize boiler short cycling
and allow boiler purging between cycles. The 368 has a built in night setback timer and an
Optimum Start / Stop feature that allows the control to reheat the zones before the end of the
setback period.
Control Strategy . . . . . . . . . . . . . . . . pg. 2 Testing the Control . . .pg. 9
Sequence of Operation . . . . . . . . . . pg. 3 Error Messages . . . . . . pg. 11
Installation . . . . . . . . . . . . . . . . . . . . pg. 6 Technical Data . . . . . . . pg. 12
Settings . . . . . . . . . . . . . . . . . . . . . . . pg. 8 Limited Warranty . . . . . pg. 12
Zone Control 368
One & Two Stage
H1144 1
Made in Canada by
tekmar Control Systems Ltd.
N
3 4
Power
L
8 91011
Power
Pump Relay
Zone Relays
120 V 50/60 Hz 5 VA
120 V (ac) 6 A 1/3 hp, pilot duty 240 VA
120 V (ac) 6 A 1/3 hp, pilot duty 240 VA
Sep 96
31000266
2019
Do not apply power here
17 18
70°F
(21°C)
40
(4)
100
(38)
UnOccupied
5 6 7
LR 58223
NRTL/C
R
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
24 hr. Timer
0
12 hrs.
24
618
• 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
12 13 14
Com
Sen
RTU
1
RTU
2
Com
Sen
UnO
Sw
Zo
In
Com
Sen
1615
Caution: Signal wiring must be rated at least 300V
UnOccupied
Duration
0 = always Occupied
24 = always UnOccupied
M
M
M
M
PRGM
S
TIME
AMPM
UNOCC
OVR
SMWTFT
1
2
LR 58233
E150539
70
70
Power
Heat Required
Zone 2 / Hi stage
Zone 1 / Lo stage
2
3
4
1
Zone 4 / Hi stage
Zone 3 / Lo stage
Zo
Out
RTU
3
RTU
4
3-4
Com
341-2
Com
12
70
70
LR 58233
E150539
Test
Off
Optimum Start
Thermal Motor
Zone
Occ/UnOcc
1
32
Occ. only
4
System Pump
Pmp
1 2
System
Pmp
Input
120 V (ac)
Power
Supply
Input
tekmar Zone
Control
Input
tekmar RTUs
or Indoor
Sensors
Outputs
Zone Valves or
Zone Pumps
Input
tekmar
Timer
Output
tekmar Reset
Control
Output
System
Pump
Outputs
Zone Valves or
Zone Pumps
Zone Control 368
One & Two Stage
Power
Heat Required
Zone 2 Hi stage
System Pump
24 hr. Timer
• 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
Zone 1 Lo stage
2
3
4
1
Zone 4 Hi stage
Zone 3 Lo stage
70°F
(21°C)
40
(4)
100
(38)
UnOccupied
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
0
12 hrs.
24
618
LR 58223
NRTL/C
R
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1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - - Data Brochure

- Data BrochureZone Control 368D 36809/96The Zone Control 368 is a microprocessor-based energy management control that uses PIDlogic to control the te

Page 2 - Control Strategy

10Step 4 -After the test sequence is complete, the Test light begins flashing and the control enters a fast mode of operation. Duringthis time, the co

Page 3 - Sequence of Operation

11Error MessagesWhenever a fault is detected in any of the sensors and / or room temperature units (RTUs), the indicator lights will flash in specific

Page 4 - 

12The installer must ensure that this control and its wiring are isolated and/or shielded from strong sources of electromagnetic noise.Conversely, thi

Page 5 - 24 hr. Timer

2Control StrategyZONING OPERATION In a multiple zone heating system, the zones may have different internal heat gains, heat losses or different tempe

Page 6 - 

3At the start of the night setback period the heat is turned off, but the heatcontained within the slab or radiator continues to heat the building and

Page 7 - 

4Common Blocks The 368 has 2 common blocks for both the RTU inputs and the relay outputs. Eachcommon block has a terminal s

Page 8 - Settings

5Slow Acting Zone Valves with Thermal Motors When the DIP switch is set to Thermal Motor, the 368 assumes that slow acting zonevalves w

Page 9 - Test Sequence

6Exercising ProcedureThe 368 first exercises the zone valves or pumps. If a zone valve or zone pump has not been operated in the past 3 days, the 368t

Page 10 - Sensor and Internal Faults

7(12) terminal on the last 368 in the chain can be connected to the Zo In terminal on atekmar reset control.Note The wires from the Zone Control are p

Page 11 - Error Messages

8The following tests are to be performed using standard testing practices and proceduresand should only be carried out by properly trained and experie

Page 12 - Technical Data

9Press the Start button at the desired starting time for the UnOccupied period. Once the Start button is pressed, the 368 enters theUnOccupied period

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