Tekmar tekmarNet 2 530 User manual

tekmarNet®2 Thermostat 530
Installation & Operation Manual
D530
12/11
Zoning Replaces:08/10
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The tekmarNet®2 Thermostat 530
provides operation for:
One Stage Heat
One Stage Cool
One Fan
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Introduction
Features
Zone Synchronization
Zone Post Purge
Intelligent setback (Timer 033)
One touch overrides (with optional
User Switch)
Auto Heating Cycle
Cooling Interlock
tekmarNet®2 communication
compatible
Requires 2 wires
One stage heat, cool, and fan
Pulse Width Modulation
CSA C US Approved for use in
USA and Canada
Outdoor temperature display
Air Group master
Backlight
Freeze Protection
Equipment Exercising
Auto heat-cool switchover
Room Temperature Limiting
Hydronic Cooling
Supports Radiant Floor Cooling
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Note
tN2 Zone Manager, Expansion
Module, Wiring Center or House
Control required for operation
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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.
Getting Started
Preparation
tekmar or jeweller screwdriver
Phillips head screwdriver
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Wire Stripper•
Tools Required
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Materials Required
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2, #6 x 1” Wood Screws
18 AWG LVT Solid Wire
(Low Voltage Connections)
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Optional Adapter Plate 007 (for
installation on 2” x 4” gang box)
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Installation
Table of Contents
Getting Started ..............................2
Installation .........................................2
Caution..........................................2
Preparation....................................2
Removing The Thermostat Base...3
Mounting The Thermostat Base....3
Thermostat Wiring.........................4
Testing the Thermostat Wiring ......5
Mounting the Thermostat ..............6
Cleaning the Thermostat...............6
Switch Settings ..................................7
User Interface....................................8
Display...........................................8
Symbols Description .....................8
Button Operation ...........................9
Settings .................................. 10-17
Sequence of Operation....................18
Heating Operation .......................18
Cooling Operation .......................19
Floor Cooling...............................20
Fan Operation .............................21
Schedules ...................................22
Scenes (System Override) ..........22
Troubleshooting ...............................23
Error Messages......................23-24
Frequently Asked Questions .......25
Job Record..................................26
Technical Data.............................27
Limited Warranty and Product
Return Procedure ........................28
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.

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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 max 80% up to 88°F (31°C) decreasing linearly to 50% RH
at 104°F (40°C). Non-condensing environment.
No exposure to extreme temperatures beyond 36-122°F (2-50°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 1000 feet (300 m).
Strip wire to 3/8” (10 mm) for all terminal connections.
Use standard 18 AWG wire for the tN2 connections.
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Installation Location
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Removing The Thermostat Base
Push
tab
1Remove thermostat
from base
2
To remove the thermostat base:
Place a small slot screwdriver or similar
tool into the slot located on the top of
the thermostat.
While pushing down against the plastic
tab, pull the thermostat away from the
thermostat’s base.
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•
Mounting The Thermostat Base
Stud
Switch
Box
Thermostat
Base
007 Adaptor
Plate
31/4”
(83 mm)
If a single gang switch box is used,
an Adaptor Plate 007 is required to
mount the thermostat to the box.
Fasten the base of the
thermostat to the adaptor plate.
Feed the wiring through the
openings in the back of the
adaptor plate and thermostat.
Use the upper and lower screw
holes to fasten the adaptor plate
to the box.
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Mounted on switch box

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If a switch box was not used, mount the
thermostat directly to the wall.
Feed the wiring through the openings in
the back of the thermostat.
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.
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Stud
23/8”
(60 mm)
screwhole
23/8”
(60 mm)
screwhole
Thermostat
Base
Wall
Mounted on wallboard
Thermostat Wiring
The thermostat operates a single heating system zone together with a cooling
system and fan.
Power and communication are provided to the thermostat by connecting the tN2
terminals on the thermostat to the tN2 terminals on a tN2 Wiring Center, House Control,
Zone Manager or Expansion Module. tN2 terminals are not polarity sensitive.
Connect the Rc, Y and G terminals on the thermostat to the R, Y and G terminals
on the cooling equipment.
12 34
1234
tNt 530
530
One Stage Heat /
One Stage Cool / One Fan
Mmm YYYY Lot # 12345
Meets Class B: Canadian ICES FCC Part 15
1023-04
tN2
1
tN2
2
Switch Settings:
For instructions see brochure
Use at least 65°C conductors
Setback
Scene
Not used
ON
Not used
Unlock Lock
Off
Off
5
G
4
Y
3
Rc
Relays: 24V (ac) 2A
tN2 Manager, Module
or Wiring Center
Cooling Equipment
1 Stage
Cooling
1 Stage
Fan
G Y R
D
X
Fan
Cooling
tN2 tN2

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tekmarNet
®
communication allows for cooling operation from rooms where only 2
conductor wire is available. This requires a Zone Manager 334 or Zone Expansion
Module 324 directly wired to the cooling equipment. Power and communication are
provided to the 530 thermostat from tN2 terminals on the 334 or 324.
324 or 334
tN2 Rc, Y, G
530
Cooling System
D
X
Testing the Thermostat Wiring
Testing the Power
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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 tN2 wires from the thermostat.
2. Use an electrical meter to measure DC voltage between the tN2 terminals.
If the DC voltage is 0 V (dc) for 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.
3. Connect the thermostat to the tN2 wires connected to a zone on a House Control,
Wiring Center, or Zone Manager.
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 the Heat Zone Output
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1. Press the Mode button to set the mode to Heat.
2. Press the button and set the heating temperature above the current room
temperature. Make sure the display does not show “WWSD”.
3. When the H1 symbol appears on the display, use an electrical meter to check
for voltage on the House Control, Wiring Center, or Zone Manager relay. The
voltage is 24 V (ac) for zone valves, and 120 V (ac) for zone pumps when operating
correctly.
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Testing the Cooling Contact
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1. Press the Mode button to set the mode to Cool.
2. Press the button and set the cooling temperature below the current room
temperature.
3. When the C1 symbol appears on the display, use an electrical meter to check for
continuity on the Rc and Y terminals. If continuity is present, the relay is operating
correctly. If continuity is not present, the thermostat has malfunctioned.
Testing the Fan Contact
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1. Press the Fan button to set the Fan to On.
2. When the Fan symbol appears, use an electrical meter to check for continuity
on the Rc and G terminals. If continuity is present, the relay is operating correctly.
If continuity is not present, the thermostat has malfunctioned.
Mounting the Thermostat
To place the thermostat back on the
mounting base:
Place thermostat bottom tabs on
matching mounting base notches.
Pivot top of the thermostat
towards wall, ensuring wires clear
obstructions.
The top clasp makes a clicking
sound when properly closed.
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Pivot
Tab
The thermostats’s exterior can be cleaned using a damp cloth. Moisten the cloth
with water and wring out prior to wiping the control. Do not use solvents or cleaning
solutions.
Cleaning the Thermostat

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Switch Settings
Switches are set to “On”
position from the factory, and
do not require changing for
most applications.
12 34
1234
tNt 530
530
One Stage Heat /
One Stage Cool / One Fan
Mmm YYYY Lot # 12345
Meets Class B: Canadian ICES FCC Part 15
1023-04
tN2
1
tN2
2
Switch Settings:
For instructions see brochure
Use at least 65°C conductors
Setback
Scene Lock
Not used
ON
Not used
Unlock
Off
Off
5
G
4
Y
3
Rc
Relays: 24V (ac) 2A
12 34
1234
Mm
Meets Class B: C di ICES
Switch Settings:
Setback
Scene Lock
Not used
ON
Not used
Unlock
Off
Off
Switch Position Action
1
ON
SETBACK
The thermostat follows a programmable setback schedule
as a schedule member if available. Requires the installation
of a Timer 033 to use this feature.
OFF
OFF
The thermostat does not follow a programmable setback
schedule.
2
ON
SCENE
The thermostat responds to changes in the scene (system
wide manual overrides). Requires the installation of a User
Switch 479 to use this feature.
OFF OFF
The thermostat does not respond to scenes.
3
ON
LOCK ACCESS LEVEL
Locked to ‘User’ access level. Set to Lock when installation
completed.
OFF
UNLOCK ACCESS LEVEL
Unlock to allow ‘User’ and “Installer’ access level. Set to
Unlock during installation process.
tekmarNet®reset control must also be set to Unlocked
(Installer access level).
4
ON Not used
OFF Not used

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SECONDARY DISPLAYMAIN DISPLAY
HEAT
Heat is turned on.
COOL
Cooling is turned on.
FAN
Fan is turned on.
SUN
Operating at the occupied
(day) temperature.
MOON
Operating at the unoccupied
(night) temperature.
AIR GROUP MASTER
Thermostat operates the
cooling for a group of
thermostats.
CLOCK
Operating on a
programmable schedule.
LOCK
Locked to ‘User’ access level.
AWAY
Operating at the Away scene
temperature.
tekmarNet®
Communication is present.
WARNING SYMBOL
Indicates an error is present.
WARM WEATHER SHUT
DOWN
The heating system has been
shut off for the summer.
Display
Symbols Description
Switch between
Heat, Cool, Auto
and Off modes
Switch between
Auto, On and %
Fan operation
Adjust the current temperature
or displayed setting up or down
User Interface

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Button Operation
The Mode button selects between Auto, Cool, Heat, and Off.
Heat Mode: The heating system operates to maintain the Set
Room Heat temperature.
Cool Mode: The cooling system operates to maintain the Set Room
Cool temperature.
Auto Mode: The heating system operates to maintain the Set Room Heat temperature.
Likewise the cooling system operates to maintain the Set Room Cool temperature.
The thermostat will prevent the Set Room Heat and the Set Room Cool settings
from getting closer than 3°F (1.5°C).
To switch from heating to cooling, the heat must be off for at least a 30 minute
interlock period and the actual Room temperature must be at least 3°F (1.5°C)
above the Set Room Heat temperature.
To switch from cooling to heating, the cooling must be off for at least a 30 minute
interlock period and the Room temperature must be at least 3°F (1.5°C) below
the Set Room Cool temperature. Cooling has priority over heating.
Off Mode: The heating and cooling are shut off except heating for freeze
protection.
Mode
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Fan
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The fan button manually turns the fan on or off.
Auto: Fan is usually off but can operate with heating or cooling.
On: Fan is on all the time.
10 to 90%: Fan operates a minimum of this percentage each hour.
Press the or the button to select the room temperature. The display indicates
whether the “HEAT” or the “COOL” temperature is being changed.
Use the or
button to adjust
temperature.
If in Auto mode, press the Mode
button to toggle between Heat or
Cool temperature adjustment.
Room or Temperature
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Settings (1 of 8)
Display Range Access Description Set to
40 to 95°F
(4.5 to 35.0°C)
Default = 70°F
(21.0°C)
Installer User
SET ROOM HEAT Set the room heating temperature while in the event.
40 to 95°F
(4.5 to 35.0°C)
Default = 65°F
(18.5°C)
Installer User
SET ROOM HEAT Set the room heating temperature while in the event.
40 to 95°F
(4.5 to 35.0°C)
Default = 62°F
(16.5°C)
Installer
SET ROOM HEAT AWAY Set the room heating temperature while in the Away scene.
Continued on next page.
• Press and hold down both the and buttons for 2 seconds to change from one step to the next. • Release both buttons once the step has been reached. • Press the or the button to change the setting, if available. • Press and hold down both the and buttons for 2 seconds to go to the next step, OR • After 10 seconds of no button activity, the display goes back to normal operation. • Note: Set switch setting #3 and tekmarNet®system control to Unlock to change Access level to Installer.
Press
+
Together

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Settings (2 of 8)
Display Range Access Description Set to
50 to 100°F
(10.0 to 38.0°C)
Default = 78°F
(25.5°C)
Installer User
SET ROOM COOL Set the room cooling temperature while in the event.
50 to 100°F
(10.0 to 38.0°C)
Default = 85°F
(29.5°C)
Installer User
SET ROOM COOL Set the room cooling temperature while in the event.
50 to 100°F
(10 to 38.0°C)
Default = 85°F
(29.5°C)
Installer
SET ROOM COOL AWAY Set the room cooling temperature while in the Away scene.
Off, 30 sec, On,
On +
Default = 30 sec
Installer User
BACKLIGHT Select the backlight operation. Off = Permanently Off 30 = Temporary on for 30 seconds On = Permanently On On + = On during and off during
Continued on next page.

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Display Range Access Description Set to
°F or °C
Default = °F
Installer User
TEMPERATURE UNITS Press the or the button to change from °F to °C and vice versa.
Device Type with
Software Version,
Address
Installer User
DEVICE TYPE Display alternates between the Device Type (large number) with Software Version (upper right corner) and the thermostat address.
40 to 95°F
(4.5 to 35.0°C)
Default = 85°F
(29.5°C)
Installer
MAXIMUM SET ROOM HEAT Set the maximum room heating limit while in the event.
40 to 95°F
(4.5 to 35.0°C)
Default = 85°F
(29.5°C)
Installer
MAXIMUM SET ROOM HEAT Set the maximum room heating limit while in the event.
40 to 95°F
(4.5 to 35.0°C)
Default = 45°F
(7.0°C)
Installer MINIMUM SET ROOM HEAT
Set the minimum room heating limit.
Settings (3 of 8)
Continued on next page.

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Display Range Access Description Set to
50 to 100°F
(10 to 38.0°C)
Default = 60°F
(15.5°C)
Installer MINIMUM SET ROOM COOL
Set the minimum room cooling limit.
50 to 100°F
(10.0 to 38.0°C)
Default = 95°F
(35.0°C)
Installer MAXIMUM SET ROOM COOL
Set the maximum room cool limit.
OFF, On
Default = OFF Installer
VENTILATION Select whether or not ventilation is required. Setting to on allows the fan to be operated in 10% increments every hour to circulate air in the building.
0, 1, 2, 3
Default = 1 Installer
FAN MODE Select how the fan should operate together with heating and cooling. 0 = Manual operation only 1 = Operate fan with cooling only 2 = Operate fan with heating and cooling 3 = Operate fan with heating only
Settings (4 of 8)
Continued on next page.

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Display Range Access Description Set to
Auto, 10 to 90%,
On
Default = Auto
Installer User
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. Available when: • Ventilation is set to On.
Auto, 10 to 90%,
On
Default = Auto
Installer User
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. Available when:
Ventilation is set to On.•
1, 2, 3, 4
Default = 1 Installer
SCHEDULE Thermostat can follow schedule master 1, 2, 3, or 4. Available when:
Switch setting 1 is set to Setback (On Position).•
Hyd (Hydronic)
or Oth (Other)
Default =
Hydronic
Installer
HEATING TERMINAL TYPE Select if the heating for this zone is hydronic or non- hydronic (other). Available when:
A reset control is present on the tekmarNet® system.
•
Settings (5 of 8)
Continued on next page.

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Display Range Access Description Set to
H1
H1
ADJUST
ADJUST
SUPPLY
OFF or On
Default = On Installer
HEAT SUPPLY PUMP During heating, select whether or not the system supply pump should turn on or be off to allow a zone group pump per manifold. Available when:
A reset control is present on the tekmarNet®system AND Heating terminal type is set to Hydronic.
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H1
H1
ADJUST
ADJUST
SUPPLY
OFF or On
Default = OFF Installer
HEAT SUPPLY PUMP DELAY During heating, select whether or not the system supply pump should be delayed by 3 minutes before coming on (for thermal motor or wax actuator). Available when:
A reset control is present on the tekmarNet®system AND Heating terminal type is set to Hydronic.
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ADJUST
ADJUST
TYPE
rEF, Coil, H1
Default = rEF Installer
COOL TERMINAL TYPE Select the type of cooling system operated. rEF = DX refrigerant coil Coil = Hydronic coil H1 = Hydronic cooling using the heating terminal unit Coil and H1 are available when:
A heat pump or chiller tekmarNet®system control is present.
•
Settings (6 of 8)
Continued on next page.

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Display Range Access Description Set to
C1
C1
ADJUST
ADJUST
SUPPLY
OFF or On
Default = On Installer
COOL SUPPLY PUMP During cooling, select whether or not the system supply pump should turn on or be off to allow a zone group pump per manifold. Available when:
A reset control is present on the tekmarNet®system AND Cool terminal type is set to Coil.
•
C1
C1
ADJUST
ADJUST
SUPPLY
OFF or On
Default = OFF Installer
COOL SUPPLY PUMP DELAY During cooling, select whether or not the system supply pump should be delayed by 3 minutes before coming on (for thermal motor or wax actuator). Available when:
A reset control is present on the tekmarNet®system AND Cool terminal type is set to Coil.
•
Auto,
SYn(Synchronize)
Default =
Synchronize
Installer
HEAT CYCLES PER HOUR Select either Auto cycle or Synchronize with other thermostats on the tekmarNet®system. Choose Synchronize when zone heated using a boiler. Choose Auto when zone is non-hydronic heating. Available when:
No reset control on the tekmarNet®system.•
Settings (7 of 8)
Continued on next page.

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Display Range Access Description Set to
ADJUST
ADJUST
OFF, 1 to 16 Installer
AIR GROUP Select if this thermostat should be an air group master. Select off if the thermsotat is not an air group master. Select 1 though 16 to select the air group number. Available when:
The thermostat is connected to other thermostats using tekmarNet®.
•
01 to 24
(no reset control),
b:01 to b:24
(reset control - boiler),
1:01 to 1:24
(reset control - mixing)
Installer
tekmarNet®ADDRESS The address is shown in the large number field. “Auto” is shown in the upper number field when using automatic addressing. Press the or the button to manually select an address. The address can be returned to automatic “Auto” addressing when address set above 24.
FLOOR
ADJUST
ADJUST
COOL OFF or On
Default = OFF Installer
FLOOR COOLING Select if the thermostat should operate the heating relay W for radiant floor cooling. Available when:
Connected to a tekmarNet®heat pump or chiller system control AND heating terminal type is set to Hydronic AND cooling terminal type is set to rEF or COIL.
•
None Installer
User
ESCAPE Press the or the button to return to normal operation.
Settings (8 of 8)

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Heating Operation Section A
Sequence of Operation
The thermostat operates the heating system to maintain the Set Room Heat
temperature. The H1 symbol is shown on the display when the thermostat is
heating. The heat can cycle on and off within +/- 1.5°F (1°C) of the Set Room
Heat temperature.
Freeze Protection
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The thermostat operates the heat whenever the room temperature falls below 40°F
(4.5°C), regardless of the thermostat mode.
Heat Terminal Unit
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When the thermostat is connected to a tekmarNet®reset control, the heat source
can be either hydronic or non-hydronic.
When the Heat Terminal is set to Hydronic, the thermostat uses indoor temperature
feedback to fine tune the water temperature and also synchronizes the start of a
heating cycle so that all thermostats start heating at the same time. This reduces
cycling on the boiler.
When the Heat Terminal is set to Other, the thermostat does not use indoor
temperature feedback. This allows the thermostat to operate non-hydronic heating
systems (example: furnace, electric baseboard, or electric fan coil), while remaining
connected to the tekmarNet®system.
Exercising
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When connected to a tekmarNet®reset control, and the heating terminal unit is set
to hydronic, the thermostat exercises the heat relay for 10 seconds every 3 days.
Exercising helps prevent zone valves or zone pumps from failing due to precipitate
buildup. During exercising, the thermostat shows “TEST” on the display.
Flushing
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The flushing feature is for open-loop systems that use a domestic hot water tank
as a heat source. Flushing ensures that fresh potable water is circulated through
the system once each day. If the thermostat is connected to a tekmarNet®reset
control with the Flushing feature turned on, the thermostat display will display the
“FLUSH” icon for the duration of the flushing operation.
Hydronic System Supply Pump
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---------------------------------------
When connected to a tekmarNet
®
system control, the thermostat’s Heat Supply
Pump setting affects how the primary pump or mix pump on the system control
operates. When connected to the boiler bus, the boiler system or primary pump is
operated. When connected to the mix bus, the mix system pump is operated.
If the thermostat operates a motorized or thermal motor zone valve, the Heat Supply
Pump setting should be set to On.

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Cooling Operation Section B
The thermostat operates the cooling system to maintain the Set Room Cool
temperature. The C1 symbol is shown on the display when the thermostat is
cooling. The cooling can cycle on and off within +/- 1.5°F (1°C) of the Set Room
Cool temperature.
The cooling system has a fixed minimum on time of 2 minutes and a minimum off
time of 5 minutes in order to prevent cooling equipment short cycling.
Air Groups
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In order to prevent heating and cooling at the same time, this thermostat can
operate together with other thermostats on a tekmarNet
®
system to form an air
group. There can be up to 16 different air groups on the same HVAC system. When
this thermostat is set as the Air Group master, it operates the cooling equipment
for the group. Other thermostats can be set to become members of the same air
group. When the cooling is turned on, all air group member thermostats ensure the
heating is off. When operating as an air group, the air temperature readings of all
the air group member thermostats are displayed on the master as an average.
The air group average temperature is shown as the “Room” temperature while
the mode is set to Cool, or the mode is set to Auto and the thermostat is allowing
cooling operation. In all other modes, the air group master thermostat measures
and displays the built-in “local” temperature
sensor measurement.
Fluctuations in the displayed “Room”
temperature may occur during automatic
mode switch over when the display changes
from using the local temperature for heating
to using the air group average temperature
for cooling.
Air Group
Master MemberMember
tekmarNet Communication
If the thermostat operates a thermal motor (wax actuator) zone valve, set the Heat
Supply Pump Delay setting to On. This provides a three minute delay to allow the
zone valve to open before the primary or mix pump is turned on.
In special applications with multiple zoning manifolds, the Heat Supply Pump setting
can be set to Off. This allows a Zone Group Pump located on the Zone Manager,
or Wiring Center to operate the pump for the manifold.
DHW Tank Priority
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---------------------------------------------------
When a tekmarNet®reset control is heating an indirect Domestic Hot Water (DHW)
tank, the thermostat may shut off the heating zones to allow the DHW tank to recover
quickly. This is determined by the DHW priority of the tekmarNet®reset control.
Warm Weather Shut Down
--------------------------------------------
--------------------------------------------
When the outdoor air temperature exceeds the Warm Weather Shut Down (WWSD)
setting on the tekmarNet®reset control, the heating system is shut off.

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Floor Cooling Section C
The thermostat has the option to support radiant floor cooling when connected to a
heat pump control using tekmarNet®communication. The heating terminal unit type
must be set to be hydronic (HYD), the floor cooling setting must be set to On and
the heating system must be in Warm Weather Shut Down (WWSD). When the heat
pump system control operates in cooling mode, all thermostats set for floor cooling
on the tekmarNet®bus all activate the first stage heating contact (H1) at the same
time to allow chilled water into the system. The thermostat continues to operate the
cooling until either the room temperature reaches the Set Heat temperature plus
3°F (Set Heat+1.5°C) or reaches a minimum temperature of 74°F. If only a floor
sensor is installed, the floor cooling setpoint is 67°F (19.5°C).
Hydronic Cooling
----------------------------------------------------
----------------------------------------------------
The thermostat has the option to support hydronic cooling using a fan coil or
a chilled beam when connected to a heat pump or chiller tekmarNet®system
control.
When operating a chilled beam or a fan coil that uses chilled water for cooling but
does not use hot water for heating, then the Cool Terminal Type should be set to
Coil. The thermostat activates the Y terminal and also provides a cooling call to
the heat pump or chiller control through the tekmarNet®communication.
When operating a fan coil that uses both hot and chilled water, then the Cool Terminal
Type should be set to H1. The thermostat activates both the Y terminal and the
heating terminal device (zone valve or zone pump), as well as provides a cooling
call to the heat pump or chiller control through the tekmarNet®communication.
Hydronic System Supply Pump
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When connected to a tekmarNet®system control, the thermostat’s Cool Pump
setting affects how the primary pump or mix pump on the system control operates
during cooling operation. When connected to the boiler bus, the boiler system or
primary pump is operated. When connected to the mix bus, the mix system pump
is operated.
If the thermostat operates a motorized or thermal motor zone valve, the Cool Supply
Pump setting should be set to On.
If the thermostat operates a thermal motor (wax actuator) zone valve, set the Cool
Supply Pump Delay setting to On. This provides a three minute delay to allow the
zone valve to open before the primary or mix pump is turned on.
In special applications with multiple zoning manifolds, the Cool Supply Pump setting
can be set to Off. This allows a Zone Group Pump located on the Zone Manager,
or Wiring Center to operate the pump for the manifold.