Tekmar D 508 User manual

- Data Brochure

Thermostat 508

D 508

05/10

Table of Contents

Display / Keypad Operation............ pg 1

Display Symbols ............................. pg 2

General ........................................ pg 2-3

Sequence of Operation................pg 3-4

Installation....................................pg 4-5

Wiring Examples.......................... pg 6-7

User Interface ................................. pg 8

Menus ........................................ pg 8-10

View Menu................................ pg 8

Adjust Menu ............................ pg 9

Schedule Menu ...................... pg 10

Error Messages ........................... pg 10

Warranty ....................................... pg 12

The thermostat’s display has four distinct fields. These fields are the Menu field, the Item

field, the Number field and the Status field. The four buttons on the face of the thermostat are

used to navigate through the menus and items to view and / or adjust the desired settings.

Display / Keypad Operation

Displays the

current

Displays an abbreviated

name of the selected item

Displays the current value

of the selected item

Selects Menus, Items

and adjusts settings

Displays the current

status of the

thermostat's inputs,

outputs and operation

AWAY

CYCLES PER HOUR

The thermostat operation is based on cycles per hour. The number of cycles per hour is adjustable

through the HEAT CYC setting in the Adjust menu. During each cycle that heating is required,

the thermostat turns on the Heat relay for a calculated amount of time. This amount of time is

the “ON time”. The ON time is calculated based on the requirements of the zone. If the zone

requires more heating, the ON time is increased. If the zone requires less heating, the ON time

is reduced.

General

Display Symbols

Warning

Displays when an error exists.

Access Level

Displays when in the user

access level.

Heat One

D i s p l a y s w h e n t h e h e a t c o n t a c t

is on.

In order to prevent short cycling of the heating relay, the

thermostat ensures that the relay remains on or off for

a minimum amount of time.

An AUTO CYC setting is available for the heating cycle.

This setting allows the thermostat to determine the

best number of cycles per hour that balances both

temperature swings and equipment cycles.

AUXILIARY SENSOR

The thermostat has a single built-in sensor to measure air temperature at the

thermostat. In addition to the built-in sensor, the thermostat has terminals to connect

one auxiliary sensor. This sensor can be either an indoor sensor, a slab sensor, or

an outdoor sensor.

Indoor Sensor

An indoor sensor is used to measure the air temperature in the zone that the thermostat

is controlling. The temperature being read by the indoor sensor is used in the calculations

of the ON time for the relay in the thermostat. This setting is made through the Adjust

menu of the thermostat. If the built-in sensor is set to ON and the auxiliary sensor is set

to Indoor, the temperatures of the sensors are averaged and used to calculate the ON

time of the relay.

Slab Sensor

A slab sensor is used to measure the slab temperature in the zone that the thermostat

is controlling. The temperature being read by the slab sensor is used in the calculations

of the ON time for the Heat relay and allows the thermostat to operate the slab between

the slab minimum and slab maximum settings.

⇐Cycle Length ⇒

Time

offoff off

on onon

Cycles Per Hour

Outdoor Sensor

An outdoor sensor can be connected to the thermostat. The temperature measured by

an outdoor sensor does not affect the ON time of the relay and is only used for display

purposes.

ACCESS LEVELS

Sequence of Operation

AIR SENSOR(S) ONLY OPERATION

When operating with only an air sensor, the ON time for the Heat relay is calculated to

satisfy the requirements of the air sensor.

SLAB SENSOR ONLY OPERATION

When operating with only a slab sensor, the ON time for the Heat relay is calculated to

satisfy the requirements of the slab sensor. The thermostat operates to maintain the slab

at the minimum slab temperature setting.

NOTE: Operating with only a slab sensor can lead to either overheating or underheating

of the space.

AIR AND SLAB SENSOR OPERATION

When operating with both air and slab sensors, the thermostat calculates an ON time for the

Heat relay to satisfy the slab sensor’s requirements and an ON time to satisfy the air sensor’s

requirements. The Heat relay operates for the longer of these two ON times.

During light heating loads, overheating can occur due to the minimum slab temperature

requirements.

During heavy heating loads, the maximum slab temperature setting limits the ON time of

the Heat relay. In this situation, underheating can occur.

The 508 thermostat has two access levels.

These access levels restrict the number of items

available in the menus of the thermostat. The

two access levels are User and Installer. This

selection is made using the DIP switch located

on the circuit board inside the thermostat.

Installer access level - allows the installer

to adjust all of the settings in the thermostat

including those required to match the thermostat

to the mechanical system and the devices

used.

User access level - allows the end user

to adjust the temperatures used by the

thermostat.

POWER

Sensor

24 V ±10% 50/60 Hz 1.5 VA.

24 V (ac) 2 A Class 2

Installer

Access level

Not used

Power:

Relay:

For 3 wires,

install jumper

R to Rh

944-02

Thermostat 508

One Stage Heat

508

4653

RhRCW

User

Meets Class B:

Canadian ICES

FCC Part 15

Made in

Canada

Apr 2010

Lot 1234

24 V

Dip Switch

Set to User access level once installation and settings have been completed.

Note: DIP switch 2 is not used.

Installation

STEP ONE

GETTING READY

Check the contents of this package. If any of the contents are missing or damaged, please

contact your wholesaler or tekmar sales representative for assistance.

Type 508 Includes:

•

• One Thermostat 508

•

Data Brochure D 508

•

• User Brochure U 508

STEP TWO

REMOVING THE FRONT COVER

Place a screwdriver or similar object into the small slot located in the top of the thermostat.

Push the screwdriver against the plastic tab and pull the top of the front cover so that it pivots

around the bottom edge of the base.

Item

Remove cover

Push tab

MODE

Heat In the heat mode, the Heat relay is operated to satisfy the temperature

requirement of the zone.

Off In the OFF mode, the Heat relay is not operated.

NOTE: If an air or slab sensor is active in the OFF mode, a freeze protection is enabled

that allows the Heat relay to be operated to keep the zone above 35°F (2°C).

STEP THREE

MOUNTING THE BASE

The thermostat should be installed on an interior wall of the desired zone approximately 5’ (1.5

m) above the floor. Do not mount the thermostat in a location that may be affected by localized

heat sources or cold drafts. It may be necessary to install a draft barrier behind the thermostat to

prevent air from blowing through the wiring hole and affecting the thermostat’s built-in sensor.

Mount the base directly to the wall using two #6

1” screws. The screws are inserted through the

mounting holes and must be securely fastened

to the wall. If possible, at least one of the screws

should enter a wall stud or similar surface.

If the thermostat is to be mounted to a 2” x

4” electrical box, order an Adaptor Plate 007.

This plate mounts to the electrical box and the

thermostat mounts to the plate. Ensure that the

electrical box does not provide cold air to the

thermostat. #6 1” screws

STEP FOUR

ROUGH IN WIRING

•

18 AWG or similar wire is recommended for all 24 V (ac) wiring.

•

All wires are to be stripped to 1/4” (6 mm) to ensure proper connection to the control.

•

Run wires from the 24 V (ac) power to the thermostat. Use a clean power source to

•

If an auxiliary sensor is used, install the sensor according to the appropriate Data

Brochure and run two wires from the sensor to the thermostat.

•

Run wires from the heating device to the thermostat.

STEP FIVE WIRING THE THERMOSTAT

(Refer to the examples on the following page.)

24 V (ac) Power

Connect the 24 V (ac) power to the R and C terminals of the thermostat. This connection

provides power to the microprocessor and display of the thermostat.

Auxiliary Sensor

Either an indoor, slab, or outdoor sensor may be connected to the auxiliary sensor input.

Connect the two wires from the auxiliary sensor to the Sensor terminals.

Heat Relay (Rh – W)

The Heat Relay Rh – W terminals are an isolated output. There is no power available

on these terminals from the thermostat. These terminals are to be used as a switch for

a 24 V (ac) circuit. This circuit can operate a low current 24 V (ac) device directly or an

external relay to enable a line voltage or high current device.

STEP SIX

INSTALLING THE FRONT COVER

Align the hinges on the bottom of the front cover with the bottom of the thermostat mounting

base. Pivot the front cover around the bottom hinges and push the top against the mounting

base until it snaps firmly in place.

Pivot front

cover around

bottom hinges

Align hinges

on bottom

of front cover

Item

NOTE: If the 508 is to be used for remote sensing (i.e. The built-in air sensor is disabled

and an indoor sensor is being used.) Mount the thermostat in the desired location in an

appropriate manner.

Wiring Examples

POWER

Sensor

24 V ±10% 50/60 Hz 1.5 VA.

24 V (ac) 2 A Class 2

Installer

Access level

Not used

Power:

Relay:

For 3 wires,

install jumper

R to Rh

944-02

Thermostat 508

One Stage Heat

508

4653

RhRCW

User

Meets Class B:

Canadian ICES

FCC Part 15

Made in

Canada

Apr 2010

Lot 1234

24 V

N115 V (ac)

24 V (ac)

Class 2

Transformer

Power

Zone 1

Zone2

Zone 3

Zone4

End Switch

Zone 2

WtN4 RC

Zone 3

WtN4 RC

Zone 4

WtN4 R

tN4 Wiring Center 316

Four Zone Pumps

WtN4CtN4C

Zone 1 Expansion End Switch

Input Power

H8002A

X X

Input Power: 24 V (ac) ±10% 60 Hz

11 VA Class 2

End Switch: 24 V (ac) 2 A

Pump Relays: 115 V (ac) 5 A

Zone Power: 115 V (ac) 12 A

Made in Canada

tektra 1031-01

Use at least 167°F (75°C) conductors

Black

Red

Auxiliary Sensor

Zone

Valve NO

POWER

Sensor

24 V ±10% 50/60 Hz 1.5 VA.

24 V (ac) 2 A Class 2

Installer

Access level

Not used

Power:

Relay:

For 3 wires,

install jumper

R to Rh

944-02

Thermostat 508

One Stage Heat

508

4653

RhRCW

User

Meets Class B:

Canadian ICES

FCC Part 15

Made in

Canada

Apr 2010

Lot 1234

24 V

Auxiliary Sensor

115 V (ac) 24 V (ac)

Class 2

Transformer

Wiring to 24 V (ac) Zone Valve

Wiring to a tekmar Wiring Center 315 or 316

115 V (ac)

24 V (ac)

Sensor Wires

115 V (ac)

24 V (ac)

Sensor Wires

Wiring to Unpowered 24 V (ac) Relay

Zone Pump

POWER

Sensor

24 V ±10% 50/60 Hz 1.5 VA.

24 V (ac) 2 A Class 2

Installer

Access level

Not used

Power:

Relay:

For 3 wires,

install jumper

R to Rh

944-02

Thermostat 508

One Stage Heat

508

4653

RhRCW

User

Meets Class B:

Canadian ICES

FCC Part 15

Made in

Canada

Apr 2010

Lot 1234

24 V

Auxiliary Sensor

24 V (ac)

Class 2

Transformer

115 V (ac)

Unpowered

Relay

Wiring to Switching Relay

Auxiliary Sensor

Zone Pump

115 V (ac)

(T)(T)

POWER

Sensor

24 V ±10% 50/60 Hz 1.5 VA.

24 V (ac) 2 A Class 2

Installer

Access level

Not used

Power:

Relay:

For 3 wires,

install jumper

R to Rh

944-02

Thermostat 508

One Stage Heat

508

4653

RhRCW

User

Meets Class B:

Canadian ICES

FCC Part 15

Made in

Canada

Apr 2010

Lot 1234

24 V

(T)(T)

HNXX HNHN NH

Com Switching Relay

Zone 1 Zone 2 Zone 3

Class 2

Transformer

(T)(T)

115 V (ac)

24 V (ac)

Sensor Wires

115 V (ac)

24 V (ac)

Sensor Wires

View Menu

ROOM TARGET

The current desired air temperature for the space. This item is

only available in the Installer access level.(Must have an active

air sensor.)

ROOM

The current air temperature for the space. (Must have at least one

active air sensor. This is the average of all active air sensors.

OUTDOOR

The current temperature at the outdoor sensor.

(SENS must be set to OUT.)

SLAB

The current slab temperature. (Must have an active slab sensor.)

The MIN segment is displayed when running at Slab Minimum.

MENU BUTTON

The menus display in the Menu Field at the left of the LCD.

Three menus are available:

• View

• Adjust

• Schd (Schedule)

To select a menu, press and release the Menu button.

ITEM BUTTON

In each menu, a group of items can be selected. The abbreviated name of the selected

item displays in the Item field of the LCD display.

• To view the next available item, press and release the Item button.

• To view the previous item, hold down the Item button and press and release the Up

button.

ADJUSTING A SETTING

To adjust a setting:

1. Use the Menu button to select the appropriate menu.

2. Use the Item button to find the desired setting.

3. Use the Up or Down button to adjust the setting.

User Interface

Adjust Menu

MODE

Current mode of operation of the thermostat.

OFF, HEAT

ROOM HEAT

Desired temperature for heating. (Must have an active air sensor

and be set to HEAT.)

35 to 100°F (1.5 to 38.0°C)

SLAB MINIMUM

Minimum slab temperature. (Must have an active slab sensor.)

OFF, 34 to 122°F (OFF, 1.0 to 50.0°C)

SLAB MAXIMUM

Maximum slab temperature. This item is only available in the

Installer access level. (Must have an active slab sensor.)

34 to 122°F, OFF (1.0 to 50.0°C, OFF)

SENSOR

Selects the type of auxiliary sensor present. This item is only

available in the Installer access level.

OFF, Indr, SLAB, OUT

ROOM SENSOR

Selects whether the built-in sensor is functional or not. This item

is only available in the Installer access level.

OFF, On

HEATING CYCLE

Determines the number of cycles per hour for the heating equipment.

This item is only available in the Installer access level.

Au, 2 to 12

UNITS

The units of temperature used to display the items.

°F, °C

Error Messages

E01

The thermostat was unable to read a piece of information stored

in its memory. The thermostat was required to load the factory

settings. The thermostat will stop operation until all settings are

checked. To clear this error, select the Installer access level and

check all of the settings in the Adjust menu.

E02

There are no active sensors selected on the thermostat. Either the

internal sensor must be turned on or the auxiliary sensor must be

set to either INDR or SLAB. After the fault is corrected, press any

button to clear the error message.

ROOM SHORT

The thermostat’s internal air sensor is short circuit. This cannot

be repaired in the field. The thermostat should be replaced or

returned for repair.

ROOM OPEN

The thermostat’s internal air sensor is open circuit. This cannot be

repaired in the field. Either turn off the internal sensor and use an

auxiliary sensor set to INDR or replace the thermostat. After the

fault is corrected, press any button to clear the error message.

SENSOR SHORT

The auxiliary sensor is short circuit. Locate and repair the problem

as described in the appropriate sensor brochure. After the fault is

corrected, press any button to clear the error message.

SENSOR OPEN

The auxiliary sensor is open circuit. Locate and repair the problem

as described in the appropriate sensor brochure. After the fault is

corrected, press any button to clear the error message.

Schedule Menu

AWAY OVERRIDE

Selects an automatic setback temperature of 62°F (16.5°C) without

altering the normal room temperature setting (Slab minimum is

ignored). Select between None & Away.

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