Tekmar Thermostat 553 Operation Manual

0 (0)

 

553_D

tekmarNet® Thermostat 553

04/13

Zoning

Replaces: New

Installation & Operation Manual

Introduction

The tekmarNet® Thermostat 553 is a communicating touchscreen

thermostat designed to operate one or two heating stages, one cooling stage, a fan and relative humidity.

Energy Saving Features

Programmable Schedule

Zone Synchronization

Zone Post Purge

Warm Weather Shut Down

Cooling Interlock

Auto Heating Cycle

Temporary Hold

Away Scene Key

 

 

 

 

Additional Features

 

 

 

 

2 Auxiliary Sensor Inputs

 

 

 

 

• tekmarNet® Communication

 

 

 

 

 

Compatible

 

 

 

 

 

• Touchscreen Technology

 

 

 

 

• Outdoor & Floor Temperature

 

 

 

 

 

Display

 

 

 

 

 

Backlight

 

 

 

 

 

Radiant Floor Heating & Cooling

 

 

 

 

Freeze Protection

 

 

 

 

 

• Pump & Valve Exercising

 

 

 

 

Heat / Cool Priority

 

 

 

 

 

 

 

 

 

 

• Air Group Master & Member

 

 

 

 

• Network Schedule Master or

 

 

 

 

 

Member

 

 

 

 

 

• Optimum Start

 

 

 

 

 

• Scenes

 

 

 

 

 

Daylight Savings Time

 

 

 

 

 

• Room Temperature Limiting

 

 

 

 

Relative Humidity Control

 

 

 

 

 

 

 

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Table of Contents

Getting Started ...............................

 

2

Installation ...........................................

 

3

Caution............................................

 

3

Preparation .....................................

 

3

Removing The Thermostat Base

....3

Mounting The Thermostat Base .....

4

Thermostat Wiring ..........................

 

4

Compatible Sensors .......................

 

5

Testing the Thermostat Wiring........

 

5

Mounting the Thermostat................

 

6

Switch Settings ....................................

 

7

User Interface ......................................

 

8

Home Screen ..................................

 

8

Symbols Description .......................

 

8

Programmable Settings .......................

 

9

Programming Menus ......................

 

9

Set Temp Menu........................

10-13

Time Menu ....................................

 

14

Schedule Menu........................

15-16

Display Menu ...........................

16-17

Scenes Menu ................................

 

17

Monitor Menu ...........................

18-21

Toolbox Menu ..........................

21-23

Setup Menu.............................

24-30

Sequence of Operation......................

31

Heat and Cool Applications ..........

31

Heating Operation.........................

31

Cooling Operation.........................

33

Room Min and Max Limits ............

33

Mode Operation ............................

34

Pump and Valve Operation...........

34

Fan Operation ...............................

35

Relative Humidity Operation.........

35

Air Group Operation......................

37

Time Clock ....................................

37

Temperature Adjustment ..............

38

Programmable Schedules ............

39

Scenes (System Override)............

40

Secondary Temperature Display ..41

Access Levels ...............................

42

tekmarNet® Address .....................

42

Cleaning the Thermostat ..............

42

Troubleshooting .................................

43

Error Messages ......................

43-47

Technical Data ..............................

47

Limited Warranty and Product

 

Return Procedure .........................

48

Getting Started

Congratulations on the purchase of your new tekmar® thermostat.

This manual will step through the complete installation, programming and sequence of operation for this control. At the back, there are tips for control and system troubleshooting.

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Installation

Caution

Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury or death. It is your responsibility to ensure that this control is safely installed according to all 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.

Preparation

Tools Required ------------------------------------------------------

 

tekmar or jeweller screwdriver

• Wire Stripper

Phillips head screwdriver

 

Materials Required --------------------------------------------------

18 AWG LVT Solid Wire (Low Voltage Connections)

Installation Location -------------------------------------------------

Choose the placement of the thermostats early in the construction process to enable proper wiring during rough-in.

Consider the following:

Interior Wall.

Keep dry. Avoid potential leakage onto the control.

Relative Humidity less than 90%. Non-condensing environment.

No exposure to extreme temperatures beyond 32-122°F (0-50°C).

No draft, direct sun, or other cause for inaccurate temperature readings.

Away from equipment, appliances, or other sources of electrical interference.

Easy access for wiring, viewing, and adjusting the display screen.

Approximately 5 feet (1.5 m) off the finished floor.

The maximum length of wire is 500 feet (150 m).

Strip wire to 3/8” (10 mm) for all terminal connections.

Use standard 8 conductor, 18 AWG wire.

Removing The Thermostat Base

To remove the thermostat base:

• Locate the tab on the bottom of the thermostat.

• Push the tab with either your thumb or with a screwdriver.

• Lift the thermostat front away from the thermostat’s base.

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Mounting The Thermostat Base

If a single gang box is used:

Feed the wiring through the large hole of the thermostat base.

Fasten the base of the thermostat to the gang box.

Terminate wiring to the wiring strip.

Push the thermostat front onto the thermostat base.

If a gang box is not used:

Feed the wiring through the large hole in the thermostat base.

Mount the thermostat base directly to the wall.

Use screws in the screw holes to fasten the thermostat to the wall. At least one of the screws should enter a wall stud or similar rigid material.

Terminate wiring to the wiring strip.

Push the thermostat front onto the thermostat base.

Thermostat

Stud

Thermostat

Front

Base

 

3 1/4

 

(83 mm)

 

Gang

 

Box

Thermostat

Thermostat

 

Base

Stud

Front

 

 

Wall

Thermostat Wiring

The thermostat can be wired in three different ways.

Stand Alone - Similar to tekmarNet®4 wiring with tN4 wiring terminal not used. First stage heating relay (Rh - W1) can be wired directly to switching relays.

tekmarNet®4 - Allows the thermostat to be wired using 4 wires to a tN4 Wiring Center or Zone Manager. The tN4 communication bus can also be daisy-chained to allow multiple thermostats to be connected together without home running wires back to the mechanical room.

tekmarNet®2 - Allows the thermostat to be wired point-to-point using 2 wires to a tN2 Wiring Center, House Control, or Zone Manager. This allows easy wiring for retrofit applications.

Application specific wiring diagrams are provided in the 553_A brochure.

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Compatible Sensors

The thermostat is compatible with Indoor Sensor type 076, 077, 084, Slab Sensor type 072, 073, 079, Outdoor Sensor type 070, Universal Sensor 082 and Duct Sensor type 083.

Testing the Thermostat Wiring

Testing tekmarNet®2 Wiring ------------------------------------------

Testing the Power

If the thermostat display turns on, this indicates that the thermostat is operating correctly and there are no electrical issues. In the event that the display is off, or the display is cycling on and off:

1.Remove the thermostat wiring cover.

2.Check to ensure that the tN2 wires on the thermostat are connected to a zone on a House Control, Wiring Center, or Zone Manager.

3.Use an electrical meter to measure DC voltage between the tN2 terminals.

If the DC voltage is 0 V (dc) for at least 20 seconds, then there is an open or short circuit in the tN2 wires.

If the DC voltage is 0 V (dc) for 10 seconds and then is 23 to 24 V (dc) for 5 seconds, this indicates the wiring is correct.

4.If the thermostat display is off, or is cycling on and off, move the thermostat to the next available zone on the House Control, Wiring Center, or Zone Manager.

If the thermostat display remains permanently on, there may be a fault with the previously tried zone on the House Control, Wiring Center, or Zone Manager.

If the thermostat display continues to be off, or is cycling on and off, there may be a fault on the thermostat.

If a fault is suspected, contact your tekmar sales representative for assistance.

Testing tekmarNet®4 and Stand Alone Wiring --------------------------

Testing the Power

1.Remove the front cover from the thermostat.

2.Use an electrical test meter to measure (ac) voltage between the R and C terminals. The reading should be 24 V (ac) +/– 10%.

3.Install the front cover.

Testing the Relay Outputs --------------------------------------------

The thermostat includes a User Test to check if the thermostat’s relays are operating and that the thermostat is wired correctly to the HVAC equipment. The User Test setting can be located in the Toolbox menu. Either Heat or Cool test can be selected.

Cancel button - Exits the user test and returns the Toolbox menu.

Hold button - Pauses the user test step for up to 5 minutes.

Next Item button - Advances the user test to the next test step.

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User Test Sequence

Heat Test

Cool Test

Step

Relay(s) Closed

Step

Relay(s) Closed

O RELAY ON

Rc to G/O

O RELAY OFF

Rc to G/O

B RELAY OFF

Rc to G/O

B RELAY ON

Rc to G/O

FAN ON

Rc to G/O

FAN ON

Rc to G/O

 

(conventional)

 

(conventional)

 

Rc to ACC

 

Rc to ACC

 

(heat pump)

 

(heat pump)

Y HEAT ON

Rc to Y

Y COOL ON

Rc to Y

W2 HEAT ON

Rc to ACC

HUMIDIFY ON

Rc to ACC

W HEAT

Rh to W

DEHUMIDIFY ON

Rc to ACC

HUMIDIFY ON

Rc to ACC

HRV ON

Rc to ACC

 

(heat and cool)

 

 

 

Rc to Y

 

 

 

(two-stage heat)

 

 

DEHUMIDIFY ON

Rc to ACC

 

 

HRV ON

Rc to ACC

 

 

*availability of test step and additional relay closures based upon Setup menu settings.

Mounting the Thermostat

Push the thermostat front onto the thermostat base. Installation is now complete.

Thermostat

Base

Thermostat

Front

Push

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Switch Settings

 

 

 

 

 

 

 

 

 

Lock

/

 

Back of

Switch

ON

tekmarNet

 

 

 

 

 

Thermostat 553

Thermostat

Settings

 

 

 

 

 

1

 

2

 

 

Two Stage Heat, One Stage Cool, Fan

 

 

Unlock Unused

www.tekmarcontrols.com

 

 

Relay:

24 V (ac) 2 A

 

 

 

 

 

 

 

Power:

tN2 or 24 V (ac) ±10% 1.8 VA

 

Mmm YYYY

 

 

 

 

 

Designed and assembled in Canada

 

Lot # 12345

 

 

 

 

 

Meets Class B: ICES & FCC Part 15

Switch Position Action

LOCK ACCESS LEVEL

ON Thermostat is locally locked and the access level cannot be changed. Set to Lock when installation has been completed.

UNLOCK ACCESS LEVEL

1 Thermostat is unlocked and the access level may be changed. Go to the Toolbox menu to change the access level. Set to Unlock during

OFF the installation process.

Note: tekmarNet® system controls include a Global Lock that locks all

connected thermostats. Set the tekmarNet® system control to unlock to allow access level adjustment on all connected thermostats.

ON Not used

2

OFF Not used

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User Interface

Home Screen

Adjust

the Time

Adjust the

Schedule

Away Key

Switch between Auto, Heat, Cool, Off & Emergency Mode

Adjust the

Temperature

Home

Button

Display Humidity, Heat Cool settings, Floor or Outdoor temperature

Room

Temperature

Turn the Fan on

Return to the ‘Home’ Screen from any menu

Symbols Description

HEAT ON

Heat is turned on.

COOL ON

Cooling is turned on.

FAN

The fan is turned on.

%RH

Humidifying

%RH

Dehumidifying

SUN

Operating at the occupied (day) temperature.

MOON

Operating at the unoccupied (night) temperature.

tekmarNet®

Communication is present.

WARNING SYMBOL

Indicates an error is present.

ARROWS

Adjust the displayed setting.

SCENE AWAY

Operating at Away temperature.

TEMPORARY HOLD

Holds temperature for 3, 6, 9 or 12 hours.

WWSD

Warm Weather Shut Down.

COOL

Cooling system is on.

MIN or MAX

Reached the room min or max.

MIN FL or MAX FL

Reached the floor min or max.

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Programmable Settings

Programming Menus

Press and hold the Home button for 3 seconds to enter the programming menus. The thermostat returns to the last programming menu previously used.

Press and hold for 3 seconds to access the programming menus.

Select a Programming Menu -----------------------------------------

Touch “NEXT” to advance (clockwise in above illustration) to the next menu.

Touch “BACK” to go backwards (counterclockwise in above illustration) through the menus.

Touch “ENTER” to enter a menu.

Setting Items --------------------------------------------------------

Touchorarrow to adjust the setting if required.

Touch “NEXT ITEM” to advance to the next item within the menu.

Touch “BACK ITEM” to go backwards to the previous item within the menu.

To return to the parent menu after changing a setting, press and release the Home button.

To return to the Home screen, press and release the Home button twice or wait 30 seconds to automatically return to the Home screen.

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Set Temp Menu (1 of 4)

Setting

 

Display

SET HEAT ROOM

event.

Room

Set the room heating temperature for the

 

Access Level: Installer, User

 

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Always available.

 

Default: 70°F (21.0°C)

SET HEAT ROOM

event.

Room

Set the room heating temperature for the

 

Access Level: Installer, User

 

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Schedules are in use or Scenes are

Default: 65°F (18.5°C)

set to All or Guest.

 

 

 

SET HEAT ROOM AWAY

 

Room

Set the room heating temperature for the Away

scene.

 

 

Access Level: Installer, User

 

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Scenes is set to Away, All or Guest.

Default: 62°F (16.5°C)

HEAT MINIMUM ROOM LIMIT

 

 

Set the minimum room heating limit.

 

 

Access Level: Installer

 

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Always available.

 

Default: 40°F (4.5°C)

HEAT MAXIMUM ROOM LIMIT

 

 

Set the maximum room heating limit for the

 

 

event.

 

 

Access Level: Installer

 

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Always available.

 

Default: 85°F (29.5°C)

HEAT MAXIMUM ROOM LIMIT

 

 

Set the maximum room heating limit for the

 

 

event.

 

 

Access Level: Installer

 

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Schedules are in use or Scenes are

Default: 85°F (29.5°C)

set to All or Guest.

 

 

 

SET HEAT FLOOR

 

 

Set the floor heating temperature for the

event.

Floor

Access Level: Installer, User

 

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Room Sensor set to OFF and Sensor

Default: 72°F (22.0°C)

1 or Sensor 2 set to Floor.

 

 

 

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Set Temp Menu (2 of 4)

Setting

 

Display

SET HEAT FLOOR

 

 

Set the floor heating temperature for the event.

Floor

Access Level: Installer, User

Range: 40 to 95°F (4.5 to 35.0°C)

Conditions: Room Sensor set to OFF and Sensor

 

1 or Sensor 2 set to Floor and Schedules are in

Default: 65°F (18.5°C)

use or Scenes are set to All or Guest.

 

WARM WEATHER SHUT DOWN

 

Set the outdoor air temperature at which heating is

 

suspended during the

event.

 

Access Level: Installer

 

Range: CTRL (control), 40 to

 

100°F (4.5 to 38.0°C), OFF

 

 

Conditions: An outdoor sensor must be available.

Default: CTRL (with tN System

Control or 70°F (21°C) (Standalone)

 

 

WARM WEATHER SHUT DOWN

 

Set the outdoor air temperature at which heating is

 

suspended during the

event.

 

Access Level: Installer

 

Range: CTRL (control), 40 to

 

100°F (4.5 to 38.0°C), OFF

 

 

Conditions: An outdoor sensor must be available and Default: CTRL (with tN System Schedules are in use or Scenes is set to All or Guest. Control or 60°F (15.5°C) (Standalone)

SET COOL ROOM

 

 

Set the room cooling temperature for the

event.

 

Access Level: Installer, User

 

Range: 50 to 100°F

 

(10.0 to 38.0°C)

 

 

Conditions: Y RELAY is set to HP or AC.

 

Default: 78°F (25.5°C)

SET COOL ROOM

 

 

Set the room cooling temperature for the

event.

 

Access Level: Installer, User

 

Range: 50 to 100°F

 

(10.0 to 38.0°C)

 

 

Conditions: Y RELAY is set to HP or AC and

 

 

Schedules are in use or Scenes is set to All or Guest. Default: 85°F (29.5°C)

SET COOL ROOM AWAY

 

 

Set the room cooling temperature during the Away

 

scene.

 

 

Access Level: Installer

 

Range: 50 to 100°F

 

(10.0 to 38.0°C)

 

 

Conditions: Y RELAY is set to HP or AC and

Default: 85°F (29.5°C)

scenes is set to Away, All or Guest.

 

 

 

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Set Temp Menu (3 of 4)

Setting

Display

COOL MINIMUM ROOM LIMIT

 

Set the minimum room cooling limit while in the

 

event.

 

Access Level: Installer

Range: 50 to 100°F (10.0 to 38.0°C)

Conditions: Y RELAY is set to HP or AC.

Default: 50°F (10.0°C)

COOL MINIMUM ROOM LIMIT

 

Set the minimum room cooling limit while in the

 

event.

 

Access Level: Installer

Range: 50 to 100°F (10.0 to 38.0°C)

Conditions: Y RELAY is set to HP or AC and

Default: 50°F (10.0°C)

Schedules are in use or Scenes is set to All or Guest.

COOL MAXIMUM ROOM LIMIT

 

Set the maximum room cooling limit.

 

Access Level: Installer

Range: 50 to 100°F (10.0 to 38.0°C)

Conditions: Y RELAY is set to HP or AC.

Default: 100°F (38.0°C)

FLOOR MINIMUM

 

Set the floor heating temperature while in the

 

event.

 

Access Level: Installer

Range: OFF, 40 to 122°F

(4.5 to 50.0°C)

 

Conditions: Sensor 1 or 2 is set to Floor, and W

Default: 72°F (22.0°C)

Terminal is set to HRF1, HRF2 or OTHR.

 

FLOOR MINIMUM

 

Set the floor heating temperature while in the

 

event.

 

Access Level: Installer

Range: OFF, 40 to 122°F

(4.5 to 50.0°C)

 

Conditions: Sensor 1 or 2 is set to Floor, and W

 

Terminal is set to HRF1, HRF2 or OTHR & Schedules Default: OFF

are in use or Scenes are set to All or Guest.

 

FLOOR MAXIMUM

 

Set the floor maximum temperature in order to

 

protect the floor covering.

 

Suggested settings: Tile = 90°F (32°C)

 

Hardwood Floor = 85°F (29°C)

 

Access Level: Installer

Range: 40 to 122°F

(4.5 to 50.0°C), OFF

 

Conditions: Sensor 1 or 2 is set to Floor, & W

Default: 85°F (29.5°C)

Terminal is set to HRF1, HRF2 or OTHR.

 

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Set Temp Menu (4 of 4)

Setting

 

Display

TEMPORARY HOLD

 

 

Temperature adjustment in the home menu can result

 

in either permanent temperature setting change or

 

temporary temperature setting change that lasts 3, 6,

 

9, 12 hours or until the next scheduled event.

 

 

Access Level: Installer

 

Range: OFF or ON

Conditions: None

 

Default: OFF

FAN

 

 

Set the minimum percentage the fan should operate

 

while in the event. This provides ventilation for the

 

building. Each 10% is 6 minutes per hour.

 

 

Access Level: Installer, User

 

Range: Auto, 10 to 90%, ON

Conditions: G/O RELAY set to FAN or ACC Relay set

Default: Auto

to FAN. 10 to 90% available if Ventilation Mode is On.

 

FAN

 

 

Set the minimum percentage the fan should operate while

 

in the event or Away scene. This provides ventilation

 

for the building. Each 10% is 6 minutes per hour.

 

Access Level: Installer, User

 

Range: Auto, 10 to 90%, ON

Conditions: G/O RELAY set to FAN or ACC Relay set to

 

FAN, and Schedules used or Scenes set to Guest or All. Default: Auto

10 to 90% available if Ventilation Mode is On.

 

 

HUMIDITY MINIMUM

 

 

Set the minimum humidity level during the

event.

 

Access Level: Installer, User

 

Range: OFF, 20 to 80%

Conditions: Humidify Mode set to HM1, 2, 3.

 

Default: 40%

HUMIDITY MAXIMUM

 

 

Set the maximum humidity level during the

event.

 

Access Level: Installer, User

 

Range: 20 to 80%, OFF

Conditions: Dehumidify Mode set to DHM1, 2, 3.

Default: 60%

HUMIDITY MAXIMUM AWAY

 

 

Set the maximum humidity level during Away scene.

 

Access Level: Installer, User

 

Range: 20 to 80%, OFF

Conditions: Dehumidify Mode set to DHM1, 2, 3.

Default: OFF

HUMIDITY

 

 

Select if the humidification or dehumidification system

 

should operate during the event or away scene.

 

Access Level: Installer, User

 

Range: OFF or On

Conditions: Humidity Mode set to DHM1, 2, 3 or

Default: OFF

Dehumidify Mode set to DHM1, 2, 3.

 

 

 

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Tekmar Thermostat 553 Operation Manual

Time Menu (1 of 1)

Setting

Display

MINUTES

 

Select the current time minutes.

 

Access Level: Installer, User

Range: 00 to 59

Conditions: Always available.

Default: 00

HOURS

 

Select the current time hours.

 

Access Level: Installer, User

Range: 12 AM to 11 PM or 00 to 23

Conditions: Always available.

Default: 12 AM

DAY OF WEEK

 

Select the current day of the week.

 

Access Level: Installer, User

Range: Sunday to Saturday

Conditions: Always available.

Default: Sunday

MONTH

 

Select the current month.

 

Access Level: Installer, User

Range: JANUARY to DECEMBER

Conditions: Always available.

Default: JANUARY

DAY OF MONTH

 

Select the day of the current month.

 

Access Level: Installer, User

Range: 1 to 31

Conditions: Always available.

Default: 1

YEAR

 

Select the current year.

 

Access Level: Installer, User

Range: 2011 to 2255

Conditions: Always available.

Default: 2011

DAYLIGHT SAVINGS TIME

 

Select if daylight savings time is observed.

 

Access Level: Installer, User

Range: OFF or ON

Conditions: Always available.

Default: ON

TIME MODE

 

Select either 12 or 24 hour time format.

 

Access Level: Installer, User

Range: 12 or 24 hour

Conditions: Always available.

Default: 12 hour

CLOCK

 

Select whether to show the time clock on the display.

 

Access Level: Installer, User

Range: OFF or ON

Conditions: The time is always shown when a sched- Default: OFF ule is used and the clock setting option is hidden.

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Schedule Menu (1 of 2)

The schedule menu can operate on a 24 hour or 7 day repeating schedule. When a 24 hour schedule is selected, “SuMoTuWeThFrSa” is shown on the top of the screen to show that the event time applies to all days of the week. When a 7 day schedule is selected, each individual day of the week is shown with the event time.

Setting

 

Display

EVENT 1

 

SuMoTuWeThFrSa

The first programmable schedule time period of

 

the day. The

temperature settings are used

 

during this time period.

 

Access Level: Installer, User

Range: 12:00 AM to 11:50 PM, SKIP

or 00:00 to 23:50, SKIP

 

 

Conditions: Schedule setting is set to Zone or

Default: 6:00 AM

Master 1, 2, 3, 4 and Event/Day is set to 2 or 4.

 

EVENT 2

 

SuMoTuWeThFrSa

The second programmable schedule time period

 

of the day. The

temperature settings are used

 

during this time period.

 

Access Level: Installer, User

Range: 12:00 AM to 11:50 PM, SKIP

or 00:00 to 23:50, SKIP

 

 

Conditions: Schedule setting is set to Zone or

Default:

10:00 PM when Event/Day is 2

Master 1, 2, 3, 4 and Event/Day is set to 2 or 4.

8:00 AM when Event/Day is 4

 

 

EVENT 3

 

SuMoTuWeThFrSa

The third programmable schedule time period

 

of the day. The

temperature settings are used

 

during this time period.

 

Access Level: Installer, User

Range: 12:00 AM to 11:50 PM, SKIP

or 00:00 to 23:50, SKIP

 

 

Conditions: Schedule setting is set to Zone or

Default: 6:00 PM

Master 1, 2, 3, 4 and Event/Day is set to 4.

 

EVENT 4

 

SuMoTuWeThFrSa

The fourth programmable schedule time period

 

of the day. The

temperature settings are used

 

during this time period.

 

Access Level: Installer, User

Range: 12:00 AM to 11:50 PM, SKIP

or 00:00 to 23:50, SKIP

 

 

Conditions: Schedule setting is set to Zone or

Default: 10:00 PM

Master 1, 2, 3, 4 and Event/Day is set to 4.

 

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