Watts Tekmar Zone Control 368 User manual

- Data Brochure
Zone Control 368
D 368
09/96
TheZoneControl368isamicroprocessor-basedenergymanagementcontrolthatusesPID
logic to control the temperature in up to 4 heating zones. Multiple zone controls can be
connectedtogetherforadditionalzonesofheating.Eithersinglestageortwostagezonescan
be provided by the control. The 368 is primarily designed for use with the tekmar House
Controls.WhenconnectedtoaHouseControl,the368providesindoortemperaturefeedback
that adjusts the supply water temperature in order to satisfy the zone with the highest heat
load. The368 also coordinates thezoning operation in orderto minimize boiler shortcycling
and allow boiler purging between cycles. The 368 has a built in night setback timer and an
OptimumStart/ Stop featurethatallows the controltoreheatthe zones beforetheend 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
891011
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
LR58233 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
LR58233 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

2
Control Strategy
ZONING OPERATION
Inamultiplezoneheatingsystem,thezonesmay have different internal heat gains, heatlossesordifferenttemperaturesettings.Each
zone must therefore have individual temperature control. For maximum comfort, the heat should be continuously supplied to the zone
atthesameratethe zoneislosingheat.Themostaccuratemethodof accomplishingthisisbyoutdoorreset;however,it is notnormally
economical to modulate the supply water temperature to every zone.
Outdoor reset can be combined with zoning for a more cost effective solution. Through
indoor sensors, a zone control can provide indoor temperature feedback to the outdoor
reset control. The outdoor reset control will then adjust the supply water temperature to
satisfy the zone with the highest water temperature requirement. Heat to the remaining
zones will be cycled on and off by the zone control using zone valves or pumps. Since the
heatiscycledonand off,accuratePIDcontrollogicshouldbeprovidedto maintainastable
indoor temperature.
PIDZoningLogic 
Proportional (P)
Inordertoprevent indoortemperatureswings,theheatsuppliedtoeachzonemustbe
proportional to the heat required by the zone. Proportional control logic can be
accomplished by pulse width modulation (PWM). A typical PWM system has a fixed
operating cycle. During this operating cycle, the on time of the zone relay is varied
based on the difference between the desired zone temperature and the actual zone
temperature. As the zone temperature drops, the relay on time increases and as the
zone temperature rises, the relay on time decreases.
Integral (I)
Controlsthatarestrictlyproportionalsufferfromaproblemofoffset.Theamountofheat
supplied to the zone depends on how far the space temperature is below the desired
setpoint.Thisimpliesthatastheheatingloadincreases,theaverageroomtemperature
droops.Onthecoldestdayoftheyear,themostheatisrequiredandthereforetheroom
temperature must be coldest.
Inordertoovercomethisoffset,integralcontrollogicisused.Onlydigitalcontrolscanprovideintegralcontrollogicduetothelengthy
response time of buildings. Integral control logic is based on time. The longer the room temperature is below the desired setpoint,
the more heat is supplied to the room. With integral control logic, full heat 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, derivative control logic is required. However,
sudden room temperature changes, for example from an open door or window, should be ignored by an intelligent control.
P + I + D = PID
If proportional, integral and derivative (PID) control logic are combined, the control is more able to prevent excessive temperature
swingsand provide astableroom temperature underall conditions. Itnotonly takes intoaccounthow much theroom temperature
has drooped, but also how long there has been a droop and how fast the temperature is changing.
Zone Load Staggering 
In a multiple zone system, there can be sudden load changes on the boiler and system
due to multiple zones turning on or off. These sudden load changes often lead to boiler
shortcyclingandunnecessarymechanicalstresses.Theoperationofthe system can be
improved by staggering the starting points of each zone relay within the operating cycle.
Staggeringofthe zones maintainsarelatively constant systemflowratewhich improves
boileroperation.Controlledstaggeringcanalsominimizeboilerrunningtimeandimprove
system efficiency when only a few zones are needed for short periods.
Zone Post Purge 
Before the last zone is turned off in a heating cycle, the boiler is turned off but the zone continues to draw heat from the boiler. This
post purge of the boiler reduces stand-by losses and reduces overall energy consumption.
UNOCCUPIED (NIGHT SETBACK)
During the night, or at times when people are not within the building, energy can be saved by lowering the building temperature for an
UnOccupied (Night Setback) period.
Due to the large thermal mass of buildings, it takes a long time for the indoor space temperature to significantly change whenever the
heating system is turned on or off. The building heat up or cool down time is further increased when high mass heating systems are
used (e.g. radiant floors). In most cases night setback cannot be used with these systems due to the long recovery time required in the
morning. A typical system is demonstrated in the diagram on page 3.
Zone 1
Zone 2
Zone 3
Zone 4
Post Purge
(Boiler off, Pump on)
On
On
On
On
On
70 °F
(21°C)
15 minutes 15 minutes
13 minutes
no heat
72 °F
(22°C)
68 °F
(20°C)
droop
70 °F
(22°C)
15 minutes 15 minutes
5 minutes
10 minutes
on
no heat
72 °F
(22°C)
68 °F
(20°C)
Heat
Source
90%
time on 85% time on 100% time on
M
MM

3
Atthe start ofthe night setbackperiodthe heat isturned off, butthe heat
contained within the slab or radiator continues to heat the building and
thereis a delaybefore thespace temperature beginsto drop. Atthe end
ofthisdelaythetemperaturewithinthebuildinggraduallydecreases,and
may eventually reach the required UnOccupied temperature after suffi-
cienttime has elapsed.Once the setbackperiod is complete,the heat is
turned on again but there is a long recovery time required to raise the
space temperature to the desired setpoint. The length of the delay and
recovery periods changes with outdoor temperature and is different for
each zone within the building.
A comfortable setback can be provided if the control “learns” the
response time for each zone within the building. Based on the zone’s
responsetime,the controlcanthencalculateanOptimumStoptimeand
anOptimumStarttime.AttheOptimumStoptimethecontrolturnsoffthe
zone valve or pump in order to overcome the delay period and at the
Optimum Start time, the control starts to raise the zone temperature in
order to overcome the recovery period. This allows night setback to be
used with most heating systems.
Optimum Start / Stop with Water Temperature Boost 
When Optimum Start / Stop is combined with Outdoor Reset, the
control can boost the water temperature during the recovery period.
Thisprovidesafasterrecoveryandallowsalongersetbackforgreater
energy savings.
The accuracy of the Optimum Start / Stop routine depends on the
feedback available to the control.
Optimum Start / Stop with both Outdoor and Indoor Sensors 
The response time of the building varies with outdoor temperature and is also different
for each zone. The most accurate Optimum Start / Stop routine is therefore achieved
whenboththeindoorandoutdoortemperaturesaremonitoredduringtransitionsbetween
UnOccupied and Occupied modes.
Optimum Start / Stop with only Indoor Sensors 
When only indoor temperature feedback is available, the control must base all Optimum
Start/Stopcalculationson
indoortemperatureonly.Iftherearelargevariationsinoutdoor
temperature,thismethodcannotprovidethesamelevelofaccuracyaswhenbothindoor
and outdoor sensors are used.
Optimum Start / Stop with only an Outdoor Sensor 
Every building, and often each zone within the building, has a different response time.
Whenonlyanoutdoorsensorisused,thecontrolmustassumeaparticularresponsetime
fortheentirebuilding.Thereforethisisgenerallytheleastaccuratemethodofcalculating
Optimum Start / Stop times.
Sequence of Operation
POWERING UP THE CONTROL
AftertheZoneControl368ispoweredup,asoftwareversioncodeisdisplayedfor2seconds
and the red indicator lights are then turned on for 4 seconds. Once the control is powered
up, the green
Power light remains on continuously. For the first fifteen minutes after power
up, the
Test light flashes and the control responds immediately to setting changes. This
allows the installer to test the operation of the system. After fifteen minutes, the control
enters its normal operating mode in which reactions to setting changes are significantly
slower.Aslowerreactiontimeallowsthecontroltoprovideamorestableroomtemperature.
ZONING OPERATION
The 368 can directly control the temperature of up to 4 One Stage heating zones or 2 Two
Stage heating zones or a combination of One Stage and Two Stage zones. In order to
measure the indoor temperature, each zone requires either an Indoor Sensor or a Room
Temperature Unit (RTU). With an RTU the desired zone temperature is set using the RTU
dial, but with an Indoor Sensor the desired zone temperature is fixed at 72°F (22°C).
Outdoor
Sensor
Room
Temperature
Units (RTU's)
Room
Temperature
Units (RTU's) Outdoor
Sensor
Delay
Period
6 A.M.9 P.M. 10 P.M. 8 A.M.
Room Temperature
Setback Period
Optimum
Stop Shorter
Recovery
Period
Optimum
Start
UnOcc
65°F (18°C)
Occ
70°F
(21°C)
Delay
Period
8 A.M.10 P.M. 11 P.M. 11 A.M.
Recovery
Period
Setback Period
Occ
70°F (21°C) UnOcc
65°F
(18°C)
Delay
Period
5 A.M.9 P.M. 10 P.M. 8 A.M.
Room Temperature
Setback Period
Optimum
Stop Recovery
Period
Optimum
Start
Occ
70°F
(21°C) UnOcc
65°F (18°C)
70
Indoor SensorRTU
Only in the first 15 minutes after power up, does the
control respond immediately to settings adjustments.
70
M

4
Common Blocks 
The 368 has 2 common blocks for both the RTU inputs and the relay outputs. Each
common block has a terminal starting with Com (Eg. Com Sen or Com 1-2 ). Each
common block can be used for either two One Stage zones or one Two Stage zone.
One Stage Common Blocks 
IfanRTUisconnectedtothelowestnumberinthecommonblock,aOneStagecommon
block is created.
Example AnRTUconnectedbetweentheterminals
ComSen — RTU1 isusedtocontrol
the output relay 1, and an RTU connected between the terminals Com Sen —
RTU 2 is used to control the output relay 2 .
Note If only one RTU is used, it must be placed on the lower number in the common
block. In the above example this would be Com Sen — RTU 1 controlling output
relay Com 1-2 — 1.
PID Zoning Logic
The368operationisbasedona15minutecycle.Duringeachcycle,
the control turns on the zone relay for a specific on time. This zone
on time is calculated based on the PID response of the zone during
the previous 15 minute period. If the zone needs more heat, the on
time is increased and if the zone needs less heat, the on time is
reduced. In order to prevent short cycling, the 368 ensures that the
zone relays remain on or off for at least 3 minutes.
Two Stage Common Blocks 
When a single RTU is connected to the highest terminal number in the common block,
a Two Stage common block is created. The single RTU therefore controls two output
relays: a Lo stage relay and a Hi stage relay.
Example An RTU connected between the terminals Com Sen — RTU 2 is used to
controltheoutputrelays 1 and 2 .Relay 1 isthe Lostage outputrelayandrelay
2 is the Hi stage output relay.
PID Zoning logic
The temperature within each Two Stage zone is controlled by
varying the on time of the output relays over a 15 minute period.
During light loads, the 368 cycles the Lo stage relay on and off. As
the load increases, the Lo stage relay on time increases until it
reachesamaximumof15minutes.The Histage relayisthenturned
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
reduceduntilthe Histage relayisturnedoffcompletely.Thecontrol
then starts to reduce the on time of the Lo stage relay.
ZoneControlLoadStaggeringandSynchronization 
The 368 staggers the operation of the zones in order to achieve a steady load on the boiler while minimizing boiler running time and
preventingboilershortcycling.MultipleZoneControlscanbeconnectedtogethertoincreasethenumberofzones.Each of the Zone
Controls synchronizes its zone operating cycles based on the Zo In input from the other Zone Controls. This results in a more stable
system flow rate and improved boiler operation.
Zone Control Operation with a tekmar House Control
The 368 can communicate with a tekmar House Control in order to
provide indoor temperature feedback, turn on the system pump and
operatethe boiler.When multiple Zone Controls areused, each Zone
Control sequentially passes the information to the tekmar House
Control. This ensures that the heat requirements of all zones are
satisfied.Whenthe368isrequestingheatfromtheHouseControl,the
Heat Required light is turned on.
Fast Acting Zone Valves or Zone Pumps 
If the Thermal Motor DIP switch is set to Off , the 368 assumes that fast acting (electric
motor)zonevalvesorzonepumpsareconnectedto the zone relays. The
HeatRequired
lightisthereforeturnedonassoonasthefirst zonerelayisturnedon.One minutebefore
thelastzonerelayisturnedoff,the368purgestheboilerbysignalingtotheHouseControl
to turn off the boiler and keep the system pump operating.
LR58233 E150539 LR58233 E150539
tekmar Zone Control
tekmar Zone Control
15 minute Cycle
Lo Stage
Lo Stage
Hi Stage
Hi Stage
Lo Stage
Hi Stage
Lo Stage
Off
Off
Off
On
On
On
On
On
H
C
R
Lo
Stage Hi
Stage
MM
Com
1-2
15
1
16
2
17
Com
Sen
56
RTU
1
RTU
2
7
Relay On Time
Relay On Time
Relay On Time Less Heat
More Heat
15 minute Cycle
H
C
R
Zone 1 Zone 2
H
M M
Com
1-2
15
1
16
2
17
Com
Sen
56
RTU
1
RTU
2
7
Fast acting
zone valve
or zone pump
Off
Thermal Motor

5
SlowActing ZoneValves withThermal 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
closingtimeoftheslowactingzonevalves.Oncethelastzonerelayisturnedoff,the368
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.
24hr. 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
isthensetusingthe UnOccupiedDuration dial.Oncethe Start buttonispushed,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
newUnOccupiedperiodstartingtimecanbeselectedbyrepeatingtheaboveprocedure.
Note If an external switch is closed between the terminals
UnO Sw — Com Sen
(11&13),the24 hr. Timer isdisabled.AnexternalUnOccupiedswitchand 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
isclosed,the368registersanUnOccupiedsignal.AtekmarTimer031isavailablewhich
canbeprogrammedtoprovideindividualUnOccupiedschedulesforeachdayoftheweek
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 IftheRTU dial foranUnOccupied zone issetbelowthe
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.Ifthe DIPswitchforaspecificzoneissetto Occ/UnOcc ,thezone isswitchedinto
UnOccupied mode whenever the 368 receives an UnOccupied signal. If the DIP switch
foraspecificzoneissetto Occ.only ,thezoneremainsintheOccupiedmodeatalltimes.
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
delayorrecoveryperiod.EitherthetekmarTimer031orthebuiltin24hr.Timeronthe 368
canbeusedwiththeOptimumStart/Stopfeature.ThetekmarTimer031hasaDIPswitch
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 SystemPump lightisturnedoneverytimetherelaycontactbetweenterminals SystemPmp—SystemPmp (1&2)isclosed.During
heatingoperation,thesystempumpoperateswheneveranyzonerequiresheat.Ifthermalmotorzonevalvesareused,thesystempump
isheld offfor the first three minutesof the zone cycle inorder togive the zone valve sufficienttime to open. The systempump may also
operate for an additional purge period once the zone relays are turned off.
Pump / Valve Exercising 
Thezonevalves,zonepumpsandsystem pump are exercisedtohelppreventcorrosionfrombuildingupandsubsequentlyjamming
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 11234
SCHD
Su
TIME
AMPM
UNOCC
OVR
SaMo We Th FrTu
1
2
Zo
Out
1211
UnO
Sw
Com
Sen
13
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
UnOccupied
Duration
0 = always Occupied
24 = always UnOccupied
Slow acting
zone valve
Off
Thermal Motor

6
Exercising Procedure
The 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 368
turns on the zone relay for 10 seconds.
Note The zone relay exercising time is increased to 3 minutes if the DIP switch is set to
Thermal Motor .
After the zone valves or pumps have been exercised, the 368 exercises the system pump. If the system pump has not operated
in the past 3 days, the 368 turns on the System Pmp relay for 10 seconds.
Once the exercising procedure is complete, the 368 returns to its normal operating sequence.
Installation
Caution Improper installation and operation of this control could result in damage to the equipment and possibly even
personalinjury.Itisyourresponsibility to ensure that thiscontrolissafelyinstalledaccordingtoall applicable codes
and standards. This electronic control is not intended for use as a primary limit control. Other controls that are
intended and certified as safety limits must be placed into the control circuit.
STEP ONE GETTING READY
Checkthecontentsofthispackage.Ifanyofthecontentslistedaremissingordamaged,pleasecontactyourwholesalerortekmarsales
representative for assistance.
Type 368 includes: • One Zone Control 368
• Data Brochures D 368, D 001
• Application Brochures A 368
Other information available: • Essays
Note Carefully read the details of the Sequence of Operation sections in all applicable brochures to ensure that you have chosen the
proper control for your application.
STEP TWO MOUNTING THE BASE
Removethecontrol from itsbasebypressing down on thereleaseclip in the wiringchamberand sliding the controlupwards.The base
is then mounted in accordance with the instructions in the Data Brochure D 001.
STEP THREE ROUGH-IN WIRING
Allelectricalwiringterminatesinthecontrolbasewiringchamber.Thebasehasstandard7/8"(22mm)knockoutswhichacceptcommon
wiringhardwareandconduitfittings.Beforeremovingtheknockouts,checkthewiringdiagramandselectthosesectionsofthechamber
with common voltages. Do not allow the wiring to cross between sections as the wires will interfere with safety dividers which should
be installed at a later time.
Power must not be applied to any of the wires during the rough-in wiring stage.
• Ifa10KIndoorSensoris used for any zone, installtheIndoorSensor(s)accordingtotheinstructions in the Data Brochure 074and
run the wiring back to the control.
• If a 10K RTU is used, install the RTU(s) according to the installation instructions provided in the Data Brochure D 054 and run the
wiring back to the control.
• If multiple Zone Controls are used, run two wires from one Zone Control to the next to create a chain.
• Run wires from the 120 V (ac) power to the control. Use a clean power source to ensure proper operation. Multi-strand 16 AWG
wire is recommended for all 120 V (ac) wiring due to its superior flexibility and ease of installation into the terminals.
• Run wires from the system pump and from each zone valve / pump to the control.
STEP FOUR ELECTRICAL CONNECTIONS TO THE CONTROL
The installer should test to confirm that no voltage is present at any of the wires. Push the control into the base and slide it down until
it snaps in firmly.
Powered Input Connections 
120 V (ac) Power
Connect the 120 V (ac) power supply to terminals Power N — L (3 and 4).
Sensor and Unpowered Input Connections 
Do not apply power to these terminals as this will damage the control.
Zone Control Input and Output
Connectawirebetweenthe ComSen (13)terminalsoneach368. Connectthe ZoOut
(12)terminalonthefirst368 tothe ZoIn (14)terminalonthesecond368. Withseveral
Zone Controls, connect the Zo Out (12) terminal on the second 368 to the Zo In (14)
terminalonthethird368andcontinuethisprocessforeachadditional368.The ZoOut
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
3
12
NL
Pmp
4
Power
Pmp
System

7
(12) terminal on the last 368 in the chain can be connected to the Zo In terminal on a
tekmar reset control.
Note The wires from the Zone Control are polarity sensitive. The system will not
operate if the wires are reversed.
UnOccupied Switch
If an external timer or switch is used, connect the two wires from the external dry
contact switch to the UnO Sw — Com Sen (11 and 13) terminals. When these
terminals short together, the control registers an UnOccupied signal.
Note If an external switch is closed between the terminals UnO Sw — Com Sen
(11 and 13), the 24 hr. Timer is disabled and the Optimum Start / Stop
information is lost. It is recommended that either the 24 hr. Timer or an
external timer / switch is used, not both at the same time.
One Stage RTU and Indoor Sensor Connections
RTUs and Indoor Sensors provide indoor temperature feedback to the control.
Common block for RTU 1 and RTU 2
• IfthecommonblockisusedforasingleOneStageheatingzone,connecttheRTU
or Indoor Sensor to terminals Com Sen — RTU 1 (5 and 6).
• If the common block is used for 2 One Stage heating zones, connect one RTU or
IndoorSensortothe ComSen — RTU1 (5and6)terminalsandconnecttheother
RTU or Indoor Sensor to the Com Sen — RTU 2 (5 and 7) terminals.
Common block for RTU 3 and RTU 4
• IfthecommonblockisusedforasingleOneStageheatingzone,connecttheRTU
or Indoor Sensor to terminals Com Sen — RTU 3 (8 and 9).
• If the common block is used for 2 One Stage heating zones, connect one RTU to
the ComSen — RTU3 (8and 9)terminals and connectthe other RTU to the Com
Sen — RTU 4 (8 and 10) terminals.
Two Stage RTU and Indoor Sensor Connections
Common Block for RTU 1 and RTU 2
• If the common block is used for a Two Stage heating zone, connect the RTU or
Indoor Sensor to terminals Com Sen — RTU 2 (5 and 7).
Common Block for 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 the 120 V (ac) pump circuit through the System Pmp —
SystemPmp (1and2)terminals.Thecontrolclosesadry relay contact between these
terminals when operation of the system pump is required.
Zone Pumps and Valves
Note Donotconnect a zonepumpandzone valve circuit tothesame Com terminal.
• If relay 1 is used, connect the zone pump or zone valve circuit to the Com 1-2 — 1
(15 and 16) terminals on the control.
• If relay
2 is used, connect the zone pump or zone valve circuit to the Com 1-2 — 2
(15 and 17) terminals on the control.
• If relay 3 is used, connect the zone pump or zone valve circuit to the Com 3-4 — 3
(18 and 19) terminals on the control.
• If relay
4 is used, connect the zone pump or zone valve circuit to the Com 3-4 — 4
(18 and 20) terminals on the control.
STEP FIVE TESTING THE WIRING
Each terminal block must be unplugged from its header on the control before power
is applied for testing. Pull straight down to unplug the terminal block.
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
15 16 17
1
18 19
34
20
Com
1-2 2
Com
3-4
15 16 17
1
18 19
34
20
Com
1-2 2
Com
3-4
15 16 17
1
18 19
34
20
Com
1-2 2
Com
3-4
15 16 17
1
18 19
34
20
Com
1-2 2
Com
3-4
3
12
NL
Pmp
4
Power
Pmp
System
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen
Com
Sen
UnO
Sw
56
RTU
1
1211 13
Com
Sen
14
Zo
In
Zo
Out
RTU
2
7
RTU
3
9
RTU
4
108
Com
Sen

8
The following tests are to be performed using standard testing practices and procedures
and should only be carried out by properly trained and experienced persons.
A good quality electrical test meter, capable of reading from at least 0 — 200 V (ac) and at
least 0 — 2,000,000 Ohms, is essential to properly test the wiring and sensors.
Test the Sensors 
InordertotestthesensorsandRoomTemperatureUnits(RTUs),theactualtemperature
at each sensor and RTU location must be measured. A good quality digital thermometer
with a surface temperature probe is recommended for ease of use and accuracy of
testing. Where a digital thermometer is not available, a spare sensor can be strapped
alongsidetheoneto betestedandthereadingscompared.TestthesensorsandRTU(s)
according to the instructions in the Data Brochures D 070, D 074 and D 054.
Test the Power Supply 
Makesureexposedwiresorbareterminalsarenotincontactwithotherwiresorgroundedsurfaces.Turn on the power and measure
thevoltagebetweenthe PowerN—L (3and 4)terminalsusinganACvoltmeter.Thereadingshouldbebetween110and130V(ac).
Test the Outputs 
System Pump
If a system pump is connected to the System Pmp — System Pmp (1 and 2) terminals, make sure power to the terminal block is
off and install a jumper between the terminals. When the system pump circuit is powered up, the system pump should start. If the
pump does not turn on, check the wiring between the terminal block and the pump and refer to any installation or troubleshooting
information supplied with the pump. If the pump operates properly, disconnect the power and remove the jumper.
Zone Pump or Valve
• If a zone pump or valve is connected to the terminals Com 1-2 —1 (15 and 16), make sure power to the pump or valve circuit is
off and install a jumper between the terminals Com 1-2 —1 (15 and 16). When the zone circuit is powered up, the zone pump
should turn on or the zone valve should open completely. If this does not occur, check the wiring between the terminal and the
pump or valve and refer to any installation or troubleshooting information supplied 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 connected to the terminals
Com 3-4 — 3 (18 and 19), follow a similar procedure as described above
for the zone 1 relay.
• If a zone pump or valve is connected to the terminals Com 3-4 — 4 (18 and 20), follow a similar procedure as described above
for the zone 1 relay.
Connect the Control 
• Make sure all power to the devices and terminal blocks is turned off and remove any remaining jumpers from the terminals.
• Reconnecttheterminalblockstothecontrolbycarefullyaligningthemwiththeirrespectiveheadersonthecontrolandthenpushing
the terminal blocks into the headers. The terminal blocks should snap firmly into place.
• Installthesuppliedsafetydividersbetweentheunpoweredsensorinputsandthepowered120V(ac)or24V(ac)wiringchambers.
• DonotapplypowertothecontroluntiltheadjustmentdialsandDIPswitchesareproperlysetforyourapplication.Seethe Settings
section of this brochure for details on how to set the dials and DIP switches.
• Oncethesettingsarecomplete,apply powertothecontrol.Theoperationofthe controlonpowerup isdescribedintheSequence
of Operation section of this brochure.
Settings
Before adjusting the dial settings, read through the sequence of operation section of this brochure to ensure that you understand how
the control operates.
STEP SIX ESSENTIAL CONTROL SETTINGS
UnOccupied
The UnOccupied dialisusedtosetthedesiredtemperature in selected zones during the
UnOccupied period.
Using the Internal 24 hr. Timer 
First determine the length of time required for the UnOccupied period and turn the
UnOccupiedDuration dial tothe desiredduration length. If the dialis setto 24hours, the
368 remains in UnOccupied mode continuously. If the dial is set to 0 hours, the 368
remains in Occupied mode continuously.
8910 12
11 13 14
Zo
Out
RTU
4
Zo
In
Com
Sen
RTU
3
UnO
Sw
Com
Sen
Ω
Ω
UnOccupied
Duration
Timer Active
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
0 = always Occupied
24 = always UnOccupied
0
12 hrs.
24
618
UnOccupied
Duration

9
Press the Start button at the desired starting time for the UnOccupied period. Once the Start button is pressed, the 368 enters the
UnOccupied period at the same starting time each day.
Example TheuserwantsanUnOccupiedperiodstartingat10pmandendingat6am.The UnoccupiedDuration dialissetto8hours
and the
Start button is pushed at 10 pm. Once the Start button is pushed, the control goes into UnOccupied mode from
10 pm until 6 am the next morning. This cycle is repeated 7 days a week.
DIP Switch Settings 
Occ / UnOcc — Occ. Only
Each zone can be selected to operate in either Occupied only mode or both Occupied
and UnOccupied modes. If the DIP switch is set to Zone 1 Occ. only , the zone
connected to relay 1 remains in Occupied mode at all times. If the DIP switch is set to
Zone 1 Occ / UnOcc , zone 1 is switched into UnOccupied mode each time the 368
receives an UnOccupied signal. Zones 2, 3, and 4 are set in a similar manner to that
described above for zone 1. If Two Stage zones are used, the DIP switches for both
output relays should be set to the same postion.
Optimum Start
The Optimum Start / Stop feature is used during transitions between the UnOccupied
mode(NightSetback)andtheOccupiedmode.WhentheDIPswitchissetto Optimum
Start ,the368raisesthebuildingtemperatureduringthefinalstagesoftheUnOccupied
period. This helps ensure the building is at the Occupied temperature as soon as the
Occupiedperiodbegins.Ifthe OptimumStart DIPswitchissetto Off ,the368doesnot
startraisingthebuildingtemperatureuntiltheUnOccupiedperiodends.Moreinforma-
tion on the Optimum Start feature is provided on page 3 of this brochure.
Thermal Motor
Zone valves with thermal actuating motors have long opening and closing times. In
order for the 368 to compensate for these longer times, the DIP switch should be set
to ThermalMotor .Iffastactingelectricmotorzonevalvesorzonepumpsareused,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 which is used to test the main control functions. The 368 continually checks the sensors and
displays an error message whenever a fault is found. See page 11 for the list of error messages. When the Test button is pushed, the
Test lightisturnedon.The HeatRequired, and OptimumStart/Stop lightsareturnedoffandtheindividualoutputsandrelaysaretested
in the following test sequence.
Test Sequence 
Each step in the test sequence lasts 10 seconds. At the end of each step, the device
continues to operate until it is turned off in a later step.
Duringthetestroutine,thetestsequencecanbepausedbypressingthe Test button.The
test sequence remains paused at that point for up to 5 minutes. If the Test button is not
pressedagainwhile the test sequenceispaused,the control exits theentiretestroutine.
Once the test sequence is paused, the Test button can be pressed again to skip to the
next step. This can also be used to rapidly skip through the test sequence. To reach the
desired step, repeatedly press and release the Test button until the appropriate device
and indicator light turn on.
Step 1 - The System Pump relay is turned on.
Step 2 - If the Com 3-4 common block is used for a single One Stage zone, the control
turns on relay 3 for 10 seconds.
- Ifthe Com3-4 commonblockisusedfortwoOneStagezones,thecontrolturns
on relay 4 for 10 seconds and then turns off relay 4 and turns on relay 3 for
10 seconds.
- If the Com 3-4 common block is used for a Two Stage zone, the control turns
on relay 3 and then, after 10 seconds, turns on relay 4 as well.
- If an RTU is not connected to
RTU 3 or RTU 4 , the control skips this step.
Step 3 - The control tests relays 1 and 2 using the procedure described in Step 2.
Occ/UnOcc
Occ. only
Zone 11234
Off
Thermal Motor
Off
Optimum Start
Test
1
System Pump
System Pump
Zone 2 / Hi stage
Zone 3 / Lo stage
Zone 4 / Hi stage
Zone 1 / Lo stage
1
2
4
3
2
1

10
Step 4 - After the test sequence is complete, the Test light begins flashing and the control enters a fast mode of operation. During
this time, the control is more responsive to setting adjustments. If the dial on an RTU is turned up, the on time of the zone
relayincreasesimmediately.Afterfifteenminutes,thecontrolrevertsbacktonormaloperatingconditionsandtheontimes
are based on the average temperature during the previous 15 minute cycle.
Manual Test 
Whilethe control isin thefast mode ofoperation and the Test light is flashing,check that
eachRTUoperatestheproperzonevalveorzonepump.Turnupthe
RTU dialtoturnthe
zone on, turn the dial down to turn the zone off. If an Indoor Sensor is used, a cold spray
to the sensor will turn the zone on.
Indicator Lights “On” 
Power • 120 V (ac) power is applied to the control and the control
is energized.
Heat Required • The 368 is sending a heat required signal to a tekmar reset control. At least one of the heating zones
requires heat.
System Pump • Therelaycontactbetween SystemPmp—SystemPmp (1and2)isclosedandtheSystemPumpshould
be turned on.
Zone 1 / Lo Stage • The relay contact between Com 1-2— 1 (15 and 16) is closed and the device connected to this relay
should be turned on.
Zone 2 / Hi Stage • The relay contact between Com 1-2— 2 (15 and 17) is closed and the device connected to this relay
should be turned on.
Zone 3 / Lo Stage • The relay contact between Com 3-4— 3 (18 and 19) is closed and the device connected to this relay
should be turned on.
Zone 4 / Hi Stage • The relay contact between Com 3-4— 4 (18 and 20) is closed and the device connected to this relay
should be turned on.
Test • The control is proceeding through the programmed test sequence.
Occupied • The control is in Occupied mode.
UnOccupied • The control is in UnOccupied (Night Setback) mode.
Optimum Start / Stop • Thecontrol is warmingthebuilding up duringthe final stagesofthe UnOccupied period,orthe heating
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 EIGHT TROUBLESHOOTING
As in any troubleshooting procedure, it is important to isolate a problem as much as possible before proceeding. The Error Messages
and
Test button greatly simplify troubleshooting of the 368. When the control is flashing an error message, identify the fault from the
look-up table on page 11 and follow standard testing procedures to confirm the problem. If you suspect a wiring fault, return to steps
three, four and five, and carefully check all external wiring and wiring connections.
Sensor and Internal Faults 
• If an RTU / Indoor Sensor fault occurs or an external Zone Control input Zo - in short circuits, the 368 operates as if that RTU or
Zone Control is not connected. An error message is displayed.
• If an internal control fault occurs, the 368 displays an error message. Press the
Test button to clear the error message. If the error
message remains, the control must be returned for repair.
STEP NINE BEFORE YOU LEAVE
• Make sure the wiring safety dividers are installed in their proper locations between compartments with different voltages.
• Install the wiring cover over the wiring chamber and secure it to the base with the two screws provided. Place the front cover on the
control and snap it into place. Install a lock if security is required.
• A sticker has been provided with the control. It is designed to be placed over the Zone 1 ... Zone 4 words
so that the zone names can be written onto the control.
• Placethisbrochure,andallotherbrochuresrelatingtothe installation, in the protectiveplasticbagsupplied
with the control.
• Place the bag in a conspicuous location near the control for future reference.
• Itisimportanttoexplaintheoperationofthecontroltotheenduserandtoanyoneelsewhomaybeoperating
the system.
Zone 3
Zone 2
Zone 4
Zone 1 /
Cooling
1
2
3
4
B
e
dr
m
Li
vin
g
Rm
K
itc
he
n
Ba
se
m
Adjusting RTU settings provides an immediate
response for the first 15 minutes only.
70
M
Test

11
Error Messages
Wheneverafaultisdetectedinanyofthesensorsand/orroomtemperatureunits(RTUs),theindicatorlightswillflashinspecificways,
to indicate the location of the problem. For detailed Sensor and RTU testing instructions see Data Brochures D 070, D 074 and D 054.
RTU 1 short circuit RTU 2 short circuit RTU 3 short circuit RTU 4 short circuit
Power
Heat Required
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
Power
Heat Required
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
Power
Heat Required
Occupied
Optimum 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
Timer Active
RTU 3 Temperature sensor open
Power
Heat Required
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
RTU 4 Temperature sensor open
Power
Heat Required
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
RTU 2 Temperature sensor open
Power
Heat Required
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
Internal fault
Power
Heat Required
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
Zo — in short circuit
Power
Heat Required
Occupied
Optimum Start / Stop
UnOccupied
Timer Active
Light on continually Light flashing Light off

12
The installer must ensure that this control and its wiring are isolated and/or shielded from strong sources of electromagnetic noise.
Conversely, this Class B digital apparatus complies with Part 15 of the FCC Rules and meets all requirements of the Canadian
Interference-CausingEquipment Regulations. However,if this controldoes cause harmfulinterference to radioor television reception,
which can be determined by turning the control off and on, the user is encouraged to try to correct the interference by reorienting or
relocating the receiving antenna, relocating the receiver with respect to this control, and/or connecting the control to a different circuit
from that to which the receiver is connected.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
CautionThenonmetallicenclosuredoesnotprovidegroundingbetweenconduitconnections.Usegroundingtypebushingsandjumper
wires.
Attention Un boîtier nonmétallique n’assure pas la continuité électrique des conduits. Utiliser des manchons ou des fils de accord
spécialement conçus pour la mise á la terre.
Zone Control 368 One & Two Stage
Literature — A 000, A 368's, D 368, D 001, D 054, D 070, D 074
Control — Microprocessor PID control; This is not a safety (limit) control.
Packaged weight — 2.9 lb. (1300 g), Enclosure A, PVC plastic
Dimensions — 6-5/8” H x 7-9/16” W x 2-13/16” D (170 x 193 x 72 mm)
Approvals — CSA NRTL / C, meets ICES & FCC regulations for EMI/RFI.
Ambient conditions — Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH non-con-
densing.
Power supply — 120 V ±10% 50/60 Hz 5 VA
Pump relay — 120 V (ac) 6 A 1/3 hp, pilot duty 240 VA
Zone relays — 120 V (ac) 6 A 1/3 hp, pilot duty 240 VA
Maximum linkage — Up to 6 Zone Controls can be linked to a tekmar reset control.
Sensors — NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
included: None.
required: RTU 054, RTU 055 or 10k Indoor Sensor for each active zone.
(Order separately)
Timer — 24 hour, 1 event / day, 3 minute backup
UnOcc. Duration — 0 to 24 hours
Unoccupied — 40 to 100°F (4 to 38°C)
All specifications are subject to change without notice.
Printed in Canada on recycled paper.
Canada on recycle
Product design, software and literature are Copyright © 1996 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
tekmar Control Systems Ltd., Canada
tekmar Control Systems, Inc., U.S.A.
Head Office: 5100 Silver Star Road
Vernon, B.C. Canada V1B 3K4
Tel. [phone] Fax. [phone]
Control Systems
The warranty applicable to a product is as set out in the statement of warranty
policy (the "Warranty") above, receipt of which is hereby acknowledged. The
liability of tekmar is limited to those obligations identified in the warranty as
obligations of tekmar. The warranty is understood to be in substitution for any
loss, costs or damages for which tekmar might otherwise be liable at law or in
equity and in particular, in lieu of any liability for fundamental breach of
contract.
tekmar disclaims any responsibility for losses, expenses, inconveniences, or
any special, indirect, secondary, incidental or consequential damages arising
from ownership or use of any items subject to any claim hereunder, regardless
of whether such claim is stated in contract, tort or strict product liability.
This warranty is in lieu of all other warranties, express or implied, including,
withoutlimitation,warrantiesofmerchantability,fitness foraparticularpurpose,
durability or description of the product, its non-infringement of any relevant
patentsortrademarks,anditscompliancewithornon-violationofanyapplicable
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 an implied warranty
lasts, so the above limitation may not apply to you. This warranty gives you specific
legal rights, and you may also have other rights which vary from state to state or
province to province.
ProductReturnProceduresProductsthatarebelievedtohavedefectsinworkmanship
or materials must be returned, together with a written description of the defect, to the
tekmar representative for that territory. If the address of the representative is not
known, please request it from tekmar at the telephone number listed below.
Limited Warranty
The liability of tekmar Control Systems Ltd. and tekmar
ControlSystems, Inc.("tekmar")under thiswarrantyislimited. Pleasereadand
understand the conditions appearing herein.
tekmarwarrants each tekmar productagainstdefectsin workmanship and materials,
when the product is installed and used in compliance with tekmar's instructions. The
warranty period is for a period of twenty-four (24) months from the production date if
the product is not installed during that period, or twelve (12) months from the
documented date of installation if installed within twenty-four (24) months from the
production date, but in any event the warranty period shall not extend beyond thirty-
six (36) months from the production date. During the warranty period, tekmar will, at
its discretion, either repair at no charge, exchange or give credit for the defective
product, provided the product is returned to tekmar.
Theliabilityoftekmarshallbelimitedtothecostofpartsand labourprovidedbytekmar
to correct defects in materials and / or work-manship or to the exchange of the
defective product for a replacement product or to the granting of credit limited to the
originalcostoftheproduct,attekmar'sdiscretion,andsuchrepair,exchange orcredit
shallbedeemedtobe the sole remedy available from tekmar.Thiswarrantydoesnot
cover the cost of the parts or labour to remove or to transport the defective product,
or to reinstall the repaired or replacement product. Returned products that are not
defective are not covered by this warranty.
This warranty does not apply if the product has been damaged by accident, abuse,
misuse, negligence, fire, Act of God, or has been damaged by modifications,
alterations or attachments made subsequent to purchase which have not been
authorized by tekmar, or if the product was not installed in compliance with the
local codes and ordinances, or if due to defective installation of the product.
Limited Warranty and Product Return Procedure
Technical Data
Zone Control 368
One & Two Stage
H1144 1
Made in Canada by
tekmar Control Systems Ltd.
N
3 4
Power
L
891011
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
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
Test
Off
Optimum Start
Thermal Motor
Zone
Occ/UnOcc
1
32
Occ. only
4
System Pump
Pmp
1 2
System
Pmp