Installation & Operation Manual
406_D
11/12
tekmarNet®2 House Control 406
Alternative
Energy
Replaces: 12/11
Introduction
The tN2 House Control 406 is designed to operate the
equipment in a 2-pipe, single tank, hydronic heating and
cooling system. It operates two heat pump stages (waterto-water or air-to-water) with a backup heat source (boiler
or electric resistance). The heat pump provides either hot
or chilled water to a storage tank loop and optional mixed
temperature loop. For radiant heating, the water temperature
is calculated using outdoor temperature reset. For radiant
cooling, the chilled water temperature is maintained at an
adjustable setpoint, or is adjusted using dew-point reset with
a humidity sensor. A backup boiler can provide an outdoor
reset water temperature as well as domestic hot water and
setpoint water temperatures. The 406 operates 4 on-board
heating and cooling zones and is expandable up to 52 zones
total on the boiler, tank, and mix water temperatures.
Features
•
•
•
•
•
•
•
•
•
•
One or two-stage heat pump control
Equal runtime rotation for two heat pumps
On/off or modulating boiler control
Tank, mix and boiler outdoor reset temperatures
Domestic hot water operation
Setpoint operation
Mixing with variable speed pump
For use with tekmarNet ®2 Thermostats
Four 24 V (ac) built in powered zone valve outputs
Expand to 24 zones on two water temperatures using
tekmarNet ®4 expansion ports
• CSA C US Certified for use in USA and Canada
Benefits
Menu
• Energy efficiency through Outdoor Temperature
Reset with Indoor Temperature Feedback
• Indoor Temperature Feedback minimizes the water
temperature (increasing energy savings), and the
efficiency of your mechanical equipment through
integrated tekmarNet ® Thermostats
• Zone Synchronization reduces equipment cycling
• Auto Differential - Reduces boiler cycling
• Compact enclosure for flexible installation
• Simple zone expansion using Wiring Centers
Item
House Control 406
Note
• For hydronic cooling with a fancoil, use tekmarNet ®2
Thermostat 530 or tekmarNet ®4 Thermostat 540 with
a date code of December 2011 or newer.
• For floor cooling, use tekmarNet®2 Thermostats 527, 528,
529, 530 or tekmarNet®4 Thermostats 537, 538, and 540
with a date code of December 2011 or newer.
1 of 48
© 2012
406_D - 11/12
Table of Contents
Installation .........................................................................2
Preparation ....................................................................2
Physical Dimensions .....................................................3
Installation Location.......................................................3
Rough-In Wiring.............................................................3
Sizing the Transformer ..................................................4
Control Wiring ................................................................4
Sensor Wiring ................................................................7
Testing the Sensor Wiring .............................................8
Testing the Control Wiring .............................................9
Max Heat ..................................................................... 10
Applications ..................................................................... 11
User Interface ..................................................................21
Display ......................................................................... 21
Symbols ....................................................................... 21
Navigating The Display ............................................... 21
Access Levels and Thermostat Lock ..........................22
Programming and Settings..........................................22
View Menu ..................................................................22
Adjust Menu ................................................................ 24
Monitor Menu ..............................................................29
Toolbox Menu ............................................................. 31
Sequence of Operation ...................................................32
tekmarNet ® System .....................................................32
System Setup ..............................................................32
Heat Cool Operation....................................................34
Hydronic Operation .....................................................35
Heat Pump Operation..................................................36
DHW Operation ........................................................... 37
Boiler Operation ..........................................................39
Setpoint Operation ...................................................... 41
Mixing Operation .........................................................42
Pump Operation ..........................................................42
Troubleshooting ...............................................................43
Error Messages ..........................................................43
Frequently Asked Questions .......................................46
Job Record .................................................................. 47
Technical Data.................................................................48
Limited Warranty and Product Return Procedure ...........48
Getting Started
Congratulations on the purchase of your new tekmarNet ® House Control!
This manual covers the complete installation, programming and sequence of operation for this control. You will also find instruction on testing, commissioning, and troubleshooting the control and system that it operates.
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. Do not
attempt to service the control. Refer to qualified personnel for
servicing. There are no user serviceable parts. Attempting
to do so voids warranty and could result in damage to the
equipment and possibly even personal injury or death.
Radio Frequency Interference
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-Causing Equipment Regulations.
However, if this control does cause harmful interference to
radio or television reception, which is determined by turning
the control off and on, the user is encouraged to try to correct
the interference by re-orientating 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.
Preparation
Tools Required -----------------------------------------------------------------------------------------------------------------------------------------------------• tekmar or jeweller screwdriver
• Phillips head screwdriver
• Needle-nose Pliers
• Wire Stripper
Materials Required -------------------------------------------------------------------------------------------------------------------------------------------------•
•
•
•
(2) #10 x 1” Wood Screws
(5) Wire Nuts
18 AWG LVT Solid Wire (Low Voltage Connections)
14 AWG Solid Wire (Line Voltage Connections)
© 2012
406_D - 11/12
• tekmar 009K (24 V (ac) transformer with 4” x 4” junction box)
• 4” x 4” Extension Ring for Electrical Junction Box
• Cable or Conduit Connectors
2 of 48
Power Required ------------------------------------------------------------------------------------------------------------------------------------------------------• 115 V (ac), 1-phase, 15 A service from circuit breaker panel
(potentially up to two circuits)
• Power disconnect (optional)
Physical Dimensions
Front View
Side View
Control designed to mount on 4” x 4” electrical
box (not included). For systems that require 2
power sources of 115 V (ac), a box extension
ring is required to increase box fill capacity.
1/2” Knock-out (x 4)
Back View
Item
DHW
Call
H8009B
7/8”
(22 mm)
House Control 406
Zone 1
C Vlv
Zone 2
C Vlv
Zone 3
C Vlv
Rc2 Y2
Setpoint
Call
Menu
Backup
Sensors - No Power
Tank Com Boil HPRt Com Out
5–1/2”
(140 mm)
Mod dc/mA Boil / Mix
Tank
+
tN4 C tN4 C
Mix/DHW tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2 Rc1 Y1 O/B
No Power Zone 1
Zone 2 Zone 3 Zone 4
Zone 4 Input Power
C Vlv C R
CL
1–1/8” (30 mm)
5–1/2”
(140 mm)
2–1/4”
(57 mm)
4–1/2” (114 mm)
1/2” x 5/8”
(12 mm x 16 mm)
Knock-out (x 4)
Ø 1/8”
(3 mm)
7/8” x 1/2” (23 mm x 12 mm)
Knock-out (x 4)
Installation Location
• When choosing the location for the control, consider the
following:
• Keep dry. Avoid potential leakage onto the control.
RH 90% to 104°F (40°C).
Non-condensing environment.
• Do not expose to operating temperatures beyond 32-104°F
(0-40°C)
• Provide adequate ventilation.
• Keep away from equipment, appliances or other sources of
electrical interference.
• Locate the control near pumps and/or zone valves if possible.
• Provide easy access for wiring, viewing and adjusting the
control.
• Mount approximately 5 ft. (1.5 m) off the finished floor.
• Install the electrical junction box to a wall using #10 x
1” wood screws. Wall anchors are recommended when
mounting to sheet rock wallboard or masonry.
• Install the extension ring onto the electrical junction box.
Total box volume must be 38 cubic inches (623 cm3) or
greater to comply with National Electrical Code (NEC) or
Canadian Electrical Code (CEC).
Rough-In Wiring
Line Voltage Wiring --------------------------------------------------------------------------------------------------------------------------------------------------The control operates a number of pumps through wiring on
the back of the control. The control must be mounted to a 4” x
4” electrical junction box so that these electrical connections
are safely contained.
For ease of service, the circuit breaker or power disconnect should be located in reasonably close proximity to the
equipment.
All line voltage wire connections are recommended to be pulled
inside a flexible or solid conduit. Always follow proper wiring
practices, building and electrical codes for your jurisdiction.
Each cable must be pulled from the equipment to the electrical
junction box. It is recommended to label each cable for easy
identification. All line voltage wires should be stripped to a
length of 1/2” (13 mm).
Pull a three conductor 14 AWG cable for the following
equipment:
• Circuit Breaker or Power Disconnect
• Variable Speed Pump (if applicable)
• HP Loop Pump
• Boiler System Pump (if applicable)
• Tank System Pump (if applicable)
• Mix System Pump (if applicable)
• DHW Pump (if applicable)
• Transfer (Xfr) Pump (if applicable)
Low Voltage Wiring --------------------------------------------------------------------------------------------------------------------------------------------------Each cable must be pulled from the equipment to the control’s
plastic enclosure. All low voltage wiring connections enter the
enclosure through conduit knockouts on the sides, or through
the square knockouts on the rear. It is recommended to label
3 of 48
each cable for easy identification. All low voltage wires are
to be stripped to a length of 3/8” (9 mm) to ensure proper
connection to the control.
© 2012
406_D - 11/12
Pull two conductor 18 AWG LVT cable, up to 500 feet
(150 m) for the following equipment:
• tekmarNet®2 Thermostats
• Heat Pump Compressor Stage 1
• Heat Pump Compressor Stage 2 (if applicable)
• Heat Pump Reversing Valve (O or B)
• Modulating Boiler 0-10 V (dc) or 4-20 mA (if applicable)
• On/Off Boiler or Backup Heat Source (if applicable)
•
•
•
•
•
•
•
•
Outdoor Temperature Sensor
HP Return Temperature Sensor
Tank Supply Temperature Sensor
Boiler Supply Temperature Sensor (if applicable)
Mix Supply Temperature Sensor (if applicable)
DHW Tank Temperature Sensor (if applicable)
DHW Tank Aquastat (if applicable)
Setpoint Device (if applicable)
Sizing the Transformer
The control requires an external transformer. A tekmar Transformer
009 (or 009K which includes a 4”x 4” electrical box) can
supply up to 40 VA, and includes an in-line fuse to protect the
transformer and control.
In order to correctly size the external transformer, all loads
connected to the control must be taken into account.
When adding up the loads, consider the following:
• tekmarNet ®2 Thermostats draw approximately 2 VA each.
• Each zone valve must be sized for peak load. This can be
This chart is provided to
simplify transformer sizing:
Zone
Thermostat Load
Zone Valve Load
Total Zone Load
obtained by multiplying the peak current draw (in Amps) by
24 V (ac).
• If using a Floating Action mixing valve, add the VA draw for
the actuating motor. A tekmar Actuating Motor 741 draws
1.5 VA during normal operation.
The total power capacity of the power supply should be larger
than the total load of all the devices connected to the control. This
total load must not exceed 100 VA. Multiple tekmar Transformer
009’s can be wired together to increase total VA capacity.
1
2
+
3
+
4
+
Transformer
Control
must exceed:
Load (VA)
+
2
VA
Control Wiring
Line Voltage Wiring ------------------------------------------------------------------------------------------------------------------------------------------------CAUTION: TURN ALL POWER OFF BEFORE PERFORMING ANY WIRING.
Ensure Junction Box Extension Ring is Installed
• An extension ring must be installed on the 4” x 4” junction
box when 6 or more powered outputs for the pumps are
used on the rear of the control.
Ground the Pumps
• Connect the pump grounds to the power supply ground as
shown in Figure 1. The ground wire must also be grounded
to the electrical box.
Wire the Pump Neutrals
• If the combined pump power load is less than 12 A, then a
only a single 15 A circuit is required.
• If the combined pump power load exceeds 12 A, then two
separate 15 A circuits are required.
• Each power circuit requires it’s own neutral wire.
• Connect the Neutral (N) wires from each pump and wire to
Figure 1 - Connect Ground Wires
Tank System Pump
Figure 2 - Connect Neutral Wires
for Power Source 1
Boil System
Pump
Mix System P
HP Loop
Pump
DHW Pump
Variable
Speed Pump
© 2012
the 115 V (ac) Neutral (N) wire. If the transformer has been
mounted to this electrical box, connect its neutral wire with
this group. This is shown in Figure 2 and Figure 3.
Wire the Pump Power (L)
• If the combined pump power load is less than 12 A, then a
only a single 15 A circuit is required.
• If the combined pump power load exceeds 12 A, then two
separate 15 A circuits are required.
• Connect the 115 V (ac) line voltage (L) wire to the red Pump
Power (L) wire on the back of the House Control and to the
115 V (ac) side of the transformer. Use a wire nut or approved
connector. See Figure 4.
Wire the Pumps
• Wire each remaining line voltage pump wire into the push-in
wire connector of the corresponding pump lead on the back
of the House Control. This is shown in Figure 5 and 6.
406_D - 11/12
Transfer Pum
Tank System Pump
Boil System
Pump
HP Loop
Pump
Variable
Speed Pump
Power
Source 1
Power
Source 2
4 of 48
Power
Source 1
Figure 3 - Connect Neutral Wires
for Power Source 2
Figure 5 - System Pumps (Left)
Tank System Pump
Mix System
Pump
Boil System
Pump
DHW
Pump
HP Loop
Pump
Transfer
Pump
Variable
Speed Pump
Power
Source 2
Figure 6 - System Pumps (Right)
Figure 4 - Line Voltage
Mix System
Pump
DHW
Pump
Transfer
Pump
Power
Source 1
Power
Source 2
Rear Line Voltage Wiring Diagram ----------------------------------------------------------------------------------------------------------------------------------Back of House Control 406
Tank Sys
(black)
Boil Sys
(black)
HP Sys
(black)
(red)
Tank Sys Pump Mix Sys Pump
Boil Sys Pump
DHW Pump
HP Loop Pump Transfer Pump
Pump
Power (L)
Pump
Power (L)
L
(blue)
N
Variable
Speed
(black)
Mix Sys
(black)
DHW
(black)
Transfer
(red)
L
Variable
Speed Pump
N
to pump grounds
to pump grounds
L1 N1 G
G N2 L2
115 V (ac)
115 V (ac)
Install The Enclosure ---------------------------------• Ensure that the pump wires are neatly tucked inside the
electrical box.
• Using 2 of the 4 holes in the back of the enclosure, securely
fasten it to the junction box extension ring with 2 #10 screws
as shown in Figure 7.
5 of 48
Figure 7
© 2012
406_D - 11/12
Front Low Voltage Wiring Diagram ---------------------------------------------------------------------------------------------------------------------------------tekmarNet ®2 Thermostats
tN2 tN2
Mix Supply / DHW
Universal Sensor
tN2 tN2
tN2 tN2
tN2 tN2
Tank Supply
Universal Sensor
Zone 3
C Vlv
Modulating
Boiler
Backup
+
H8009B
Zone 2
C Vlv
Expansion
—
1
Rc2 Y2
DHW
Call
House Control 406
Zone 1
C Vlv
tN4 Boil/Mix
tN4
Item
tN4 Tank
Expansion
C
Menu
tN4
Setpoint
Call
Setpoint Call
Mod dc/mA Boil / Mix
Tank
+
tN4 C tN4 C
C
Outdoor Sensor
Sensors - No Power
HP Return
Universal Sensor
Mix/DHW tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2 Rc1 Y1 O/B
No Power Zone 1
Zone 2 Zone 3 Zone 4
Tank Com Boil HPRt Com Out
Boiler Supply
Universal Sensor
tekmarNet ®4 Expansion to
Wiring Centers, Timers, or
User Switch
Zone 4 Input Power
C Vlv C R
One Stage
Boiler T-T
DHW Call
from DHW
Tank Aquastat
(optional)
One or Two Stage
Heat Pump
R
24 V (ac) Zone Valves
C
L
N
24 V (ac) Transformer 009
Low Voltage Wiring ------------------------------------------------------------------------------------------------------------------------------------------------External Power Supply
It is strongly recommended that a transformer with an in-line
fuse be used in order to protect the transformer from high
currents. The tekmar Transformer 009 includes a fuse.
• Connect the 24 V (ac) leads from the transformer to the C
and R terminals marked “Input Power” on the 406.
tekmarNet ®2 Thermostats (tN2)
The 406 is designed to operate with tekmarNet®2 Thermostats.
They provide the heating and cooling control for each zone,
and communicate with any other tekmarNet ® device on the
system.
• Connect the tN2 terminals from each thermostat to the corresponding tN2 terminals for each zone on the 406.
Zone Valves
• Wire the zone valves to the C and Vlv terminals on the 406.
• End switches on zone valves are not required when using
the 406.
tN4 Expansion Terminals
The 406 uses the Expansion tN4 and C terminals to communicate with additional thermostats, setpoint controls, and
other tekmarNet ® devices. Connect to either the Tank or the
Boil / Mix tN4 and C terminals on the 406.
© 2012
406_D - 11/12
6 of 48
Tank
To add additional Tank water temperature zones to the system,
install a tekmarNet ® Wiring Center.
• Connect the Tank terminals, tN4 and C, on the 406 to the
corresponding tN4 and C Expansion terminals on the external Wiring Center.
Boil / Mix
To add additional Boil or Mix water temperature zones to the
system, install a tekmarNet ® Wiring Center.
• Connect the Boil/Mix terminals, tN4 and C, on the 406 to
the corresponding tN4 and C Expansion terminals on the
external Wiring Center.
Domestic Hot Water (DHW) or Setpoint Call
When the control receives a DHW Call or Setpoint Call for heat
it will override Outdoor Reset and Indoor Feedback and operate
the boiler to heat the DHW tank or the Setpoint equipment.
• To create a DHW call, wire a dry contact switch to the DHW
call terminals.
• To create a Setpoint call, wire a dry contact switch to the
Setpoint call terminals.
Wiring the Heat Pump
The 406 can operate a single heat pump with a two-stage
compressor in heating or cooling mode.
• Connect the Rc1 and Y1 terminals on the 406 to the R and
Y1 terminals on the heat pump.
• Connect the Rc2 and Y2 terminals on the 406 to the R and
Y2 terminals on the heat pump.
• Connect the Rc1 and O/B terminal on the 406 to the R and
O or B terminal on the heat pump.
Wiring the Auxiliary Backup
The 406 can operate an auxiliary backup other than a boiler.
• Use the Backup terminals on the 406 to switch on the auxiliary backup (ie electric element).
On/Off Boiler
• Connect the Backup terminals on the 406 to the T-T (or RW) terminals on the boiler.
Modulating Boiler
• Wire the Mod (dc/mA) positive (+) and negative (-) terminals
on the 406 to the input signal terminals on the boiler. Correct
polarity of the wires is important.
• In some cases, the modulating boiler also requires contact
closure on the T-T terminals to fire the boiler. If required,
connect the Backup terminals on the 406 to the T-T (or RW) terminals on the boiler.
Sensor Wiring
Mounting the Outdoor Sensor ----------------------------------------------------------------------------------------------------------------------------------------Note: The temperature sensor (thermistor) is built into the
sensor enclosure.
• Remove the screw and pull the front cover off the sensor
enclosure.
• The outdoor sensor can either be mounted directly onto a
wall or a 2” x 4” electrical box. When the outdoor sensor is
wall mounted, the wiring should enter through the back or
bottom of the enclosure. Do not mount the outdoor sensor
with the conduit knockout facing upwards as rain could
enter the enclosure and damage the sensor.
Sensor with rear
entry wiring
• In order to prevent heat transmitted through the wall from
affecting the sensor reading, it may be necessary to install
an insulating barrier behind the enclosure.
• The outdoor sensor should be mounted on a wall which best
represents the heat load on the building (a northern wall
for most buildings and a southern facing wall for buildings
with large south facing glass areas). The outdoor sensor
should not be exposed to heat sources such as ventilation
or window openings.
• The outdoor sensor should be installed at an elevation above the
ground that will prevent accidental damage or tampering.
Sensor with bottom
entry wiring
Sensor mounted
onto 2" x 4"
electrical box
Wiring the Outdoor Sensor --------------------------------------------------------------------------------------------------------------------------------------------• Connect 18 AWG or similar wire to the two terminals provided in the
enclosure and run the wires from the outdoor sensor to the control. Do
not run the wires parallel to telephone or power cables. If the sensor
wires are located in an area with strong sources of electromagnetic
interference (EMI), shielded cable or twisted pair should be used or
the wires can be run in a grounded metal conduit. If using shielded
cable, the shield wire should be connected to the Com or Com Sen
terminal on the control and not to earth ground.
• Follow the sensor testing instructions in this brochure and connect
the wires to the control.
• Replace the front cover of the sensor enclosure.
Wires from outdoor
sensor to control
terminals
(Com Sen - Out Sen)
Sensor is built into
the enclosure
7 of 48
© 2012
406_D - 11/12
Mounting the Universal Sensor -----------------------------------------------------------------------------------------------------------------------------------Note: These sensors are designed to mount on a pipe or in a temperature
immersion well.
The Universal Sensor should be placed downstream of a pump or after an elbow
or similar fitting. This is especially important if large diameter pipes are used as
the thermal stratification within the pipe can result in erroneous sensor readings.
Proper sensor location requires that the fluid is thoroughly mixed within the pipe
before it reaches the sensor.
Strapped to Pipe
The Universal Sensor can be strapped directly to the pipe using the cable tie
provided. Insulation should be placed around the sensor to reduce the effect of
air currents on the sensor measurement.
Immersion Well
If a Universal Sensor is mounted onto 1” (25 mm) diameter L type copper pipe,
there is approximately an 8 second delay between a sudden change in water
temperature and the time the sensor measures the temperature change. This
delay increases considerably when mild steel (black iron) pipe is used. In general,
it is recommended that a temperature well be used for steel pipe of diameter
greater than 1-1/4” (32 mm). Temperature wells are also recommended when
large diameter pipes are used and fluid stratification is present.
Retaining
Clip
Universal
Sensor
Sensor Well
Conduit Connection
The Universal Sensor and Universal Sensor Enclosure 080 (sold separately) are
specifically designed to mount onto a 3/8” (10 mm) ID temperature well that is
supplied with an end groove. To install the well, plumb a ‘T’ into the pipe and fix
the well into the ‘T’. The 080 enclosure has a 7/8” (22 mm) back knockout that
must be removed and fitted over the temperature well. The universal sensor is
then inserted into the well and the retaining clip supplied with the enclosure is
snapped onto the well end groove. If the well has a threaded end, the installer
must supply a standard threaded conduit retaining ring. The two wires from the
sensor are connected to the terminal block provided in the enclosure. The other
side of the terminal block is used to connect wires from the control.
Bottom of
Enclosure 080
Universal
Sensor
Cable Tie
Testing the Sensor Wiring
A good quality test meter capable of measuring up to 5,000 kΩ
(1 kΩ = 1000 Ω) is required to measure the sensor resistance. In
addition to this, the actual temperature must be measured with
either a good quality digital thermometer, or if a thermometer
is not available, a second sensor can be placed alongside
the one to be tested and the readings compared.
First measure the temperature using the thermometer and
then measure the resistance of the sensor at the control. The
wires from the sensor must not be connected to the control
while the test is performed. Using the chart below, estimate
Temperature
°F
°C
-50
-46
-45
-43
-40
-40
-35
-37
-30
-34
-25
-32
-20
-29
-15
-26
-10
-23
-5
-21
0
-18
5
-15
10
-12
15
-9
© 2012
Resistance
490,813
405,710
336,606
280,279
234,196
196,358
165,180
139,403
118,018
100,221
85,362
72,918
62,465
53,658
406_D - 11/12
Temperature
°F
°C
20
-7
25
-4
30
-1
35
2
40
4
45
7
50
10
55
13
60
16
65
18
70
21
75
24
80
27
85
29
Resistance
46,218
39,913
34,558
29,996
26,099
22,763
19,900
17,436
15,311
13,474
11,883
10,501
9,299
8,250
8 of 48
the temperature measured by the sensor. The sensor and
thermometer readings should be close. If the test meter reads
a very high resistance, there may be a broken wire, a poor
wiring connection or a defective sensor. If the resistance is
very low, the wiring may be shorted, there may be moisture
in the sensor or the sensor may be defective. To test for
a defective sensor, measure the resistance directly at the
sensor location.
Do not apply voltage to a sensor at any time as damage
to the sensor may result.
Temperature
°F
°C
90
32
95
35
100
38
105
41
110
43
115
46
120
49
125
52
130
54
135
57
140
60
145
63
150
66
155
68
Resistance
7,334
6,532
5,828
5,210
4,665
4,184
3,760
3,383
3,050
2,754
2,490
2,255
2,045
1,857
Temperature
°F
°C
160
71
165
74
170
77
175
79
180
82
185
85
190
88
195
91
200
93
205
96
210
99
215
102
220
104
225
107
Resistance
1,689
1,538
1,403
1,281
1,172
1,073
983
903
829
763
703
648
598
553
Testing the Control Wiring
Testing the Power ------------------------------------If the control display does not turn on, check the Input Power
wiring terminals using an electrical multimeter. The voltage
should measure between 21.6 to 26.4 V (ac). If the voltage
is below this range, measure the line voltage side of the
transformer. The voltage should measure between 103.5 to
126.5 V (ac).
Testing the Thermostats -----------------------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, follow this procedure.
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 from 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.
User Test ----------------------------------------------The User Test is found in the Toolbox menu of the control.
Press the Menu button to access the Toolbox Menu. Press
the Item button to locate the User Test.
Start the test sequence by going to the User Test item and
pressing the ‘Up’ arrow button.
Pause the test sequence by pressing the Item button. To
advance to the next step, press the Item button again.
If the test sequence is paused for more than five minutes,
the control exits the entire test routine and returns to normal
operation.
To advance to a particular step, repeatedly press and release
the Item button to display the appropriate device.
User Test Sequence
Step 1 Zone 1 turns on for 10 seconds.
Step 2 Zone 2 turns on for 10 seconds.
Step 3 Zone 3 turns on for 10 seconds.
Step 4 Zone 4 turns on for 10 seconds.
Step 5 The Mix 1 device ramps up to 100% over 30 seconds
or according to the motor speed setting.
Step 6 The Mix 1 device ramps down to 0% over 30 seconds
or according to the motor speed setting.
Step 7 The mix system pump turns on for 10 seconds.
Step 8 The tank system pump turns on for 10 seconds.
Step 9 The O/B contacts are closed for 10 seconds.
Step 10 The HP loop pump turns on for 10 seconds.
9 of 48
Step 11 The HP loop pump turns on and the Y1 contacts are
closed for 10 seconds
Step 12 The HP loop pump turns on and the Y2 contacts are
closed for 10 seconds if HP TYPE = ROT.
The HP loop pump turns on and the Y1 and Y2
contacts are closed for 10 seconds if HP TYPE =
2STG.
Step 13 The Backup contacts are closed for 10 seconds if
BACKUP = AUX.
Step 14 The transfer pump turns on for 10 seconds if
BACKUP = XFER.
Step 15 The variable speed pump turns on for 10 seconds if
BACKUP = VAR.
Step 16 The DHW pump turns on for 10 seconds if
WATERTEMP = T+B or T+MB and DHW Mode ≠
OFF.
Step 17 The boil system pump turns on for 10 seconds if
WATERTEMP = T+B or T+MB.
Step 18 If WATERTEMP = T+B or T+MB The boil system
pump turns on, and the tN2 zones, transfer pump,
variable speed pump (20%), and tank pump turn on
if necessary.
• If the Boil Type is 1 Stage, the backup relay is closed for 10
seconds and then opened.
• If Boiler Type is modulating 0-10 or 4-20, the backup relay is
closed for 10 seconds and the modulating output operates
at 50 % [5 V (dc) or 12 mA].
Step 19 Control returns to normal operation.
Testing the Zone Output ----------------------------------------------Activate the User Test sequence and pause at Step 1 by pressing
the Item button once Zone 1 turns on. Using an electrical meter,
measure the voltage between the zone valve and the common
(C) terminals. The voltage should measure between 21.6 V
(ac) and 26.4 V (ac). Repeat for Zones 2, 3, and 4.
Testing the Variable Speed Pump --------------------------Activate the User Test sequence and pause at Step 5 or Step
15 by pressing the Item button once the variable speed pump is
operating at 100%. Using an electrical meter, measure the voltage
between the variable speed pump and a neutral. The voltage
should measure between 103.5 V (ac) and 126.5 V (ac).
Testing the Mix System Pump ------------------------------------Activate the User Test sequence and pause at Step 7 by
pressing the Item button once the mix system pump turns on.
Using an electrical meter, measure the voltage between the
mix system pump and a neutral. The voltage should measure
between 103.5 V (ac) and 126.5 V (ac).
Testing the Tank System Pump ----------------------------------Activate the User Test sequence and pause at Step 8 by
pressing the Item button once the tank system pump turns on.
Using an electrical meter, measure the voltage between the
tank system pump and a neutral. The voltage should measure
between 103.5 V (ac) and 126.5 V (ac).
Testing the O/B Contact ----------------------------------------------Activate the User Test sequence and pause at Step 9 by
pressing the Item button once the O/B contact turns on. Using
an electrical meter, measure for continuity between the O/B
and Rc1 terminals.
© 2012
406_D - 11/12
Testing the HP Loop Pump ----------------------
Testing the DHW Pump -----------------------------------
Activate the User Test sequence and pause at Step 10 by
pressing the Item button once the HP Loop pump turns on.
Using an electrical meter, measure the voltage between the
HP Loop pump and a neutral. The voltage should measure
between 103.5 V (ac) and 126.5 V (ac).
Activate the User Test sequence and pause at Step 16 by
pressing the Item button once the DHW pump turns on. Using
an electrical meter, measure the voltage between the DHW
pump and a neutral. The voltage should measure between
103.5 V (ac) and 126.5 V (ac).
Testing the Heat Pump Stage 1 Contact --------------
Testing the Boiler System Pump---------------------------------
Activate the User Test sequence and pause at Step 11 by
pressing the Item button once the Y1 contact turns on. Using
an electrical meter, measure for continuity between the Y1
and Rc1 terminals.
Activate the User Test sequence and pause at Step 17 by
pressing the Item button once the boiler system pump turns
on. Using an electrical meter, measure the voltage between
the boiler system pump and a neutral. The voltage should
measure between 103.5 V (ac) and 126.5 V (ac).
Testing the Heat Pump Stage 2 Contact -------------Activate the User Test sequence and pause at Step 12 by
pressing the Item button once the Y2 contact turns on. Using
an electrical meter, measure for continuity between the Y2
and Rc2 terminals.
Testing the Backup Contact --------------------Activate the User Test sequence and pause at Step 13 or Step
18 by pressing the Item button once the boiler stage 1 turns
on. Using an electrical meter, measure for continuity over the
Backup terminals.
Testing the Transfer Pump ---------------------Activate the User Test sequence and pause at Step 14 by
pressing the Item button once the Transfer pump turns on.
Using an electrical meter, measure the voltage between the
Transfer pump and a neutral. The voltage should measure
between 103.5 V (ac) and 126.5 V (ac).
Testing the Boiler Modulating Output---------------------This test applies for modulating boilers only.
Active the User Test sequence and pause at Step 18 by
pressing the Item button once the boiler stage 1 turns on.
Using an electrical meter, measure for either a 5 V (dc) or 12
mA signal. The Boil Type setting selects whether the signal
is V (dc) or mA.
Testing the DHW Call ------------------------------------------------------Remove all wires from the DHW Call terminals. The control
display should show no DHW Call. Reconnect wires. Then
apply either a short circuit or 24 V (ac) over the DHW Call
terminals. The control should now show a DHW Call.
Testing the Setpoint Call ----------------------------------------------Remove all wires from the Setpoint Call terminals. The
control display should show no Setpoint Call. Reconnect
wires. Then apply either a short circuit or 24 V (ac) over
the Setpoint Call terminals. The control should now show
a Setpoint Call.
Max Heat
The control has a function called Max Heat. In this mode, the
control turns on and operates the system up to the maximum
set temperatures as long as there is a call for heat. Use this
mode to run the circulators during system start-up and commissioning, and purging air from the piping. This function is
useful when drying sheet rock and paint in the building.
To enable Max Heat, enter the Toolbox Menu and find Max
Heat. Use the up arrow to select ‘On’.
• When a space heating call is present, the heat pump and
backup will run to maintain the target at the Design temperature.
(One can purge the system using this test and leave the heat
pump and backup un-powered. This will prevent heat from
entering the system during the purge.)
© 2012
406_D - 11/12
10 of 48
• When a DHW Call or Setpoint Call is present, the boiler
will operate at the DHW exchange or Setpoint temperature
settings.
• WWSD and DHW Priority are disabled during Max Heat
mode.
• Cooling is disabled during Max Heat mode.
• When Max Heat is on the display will show ‘Max Heat
Test’.
• Max Heat will automatically turn off after 24 hours.
To cancel Max Heat, go to Max Heat in the Toolbox menu and
use the down arrow to select ‘Off’.
Applications
Mechanical
A406-1
Description: The House Control 406 operates a two stage air source heat pump in heating or cooling mode to supply an
outdoor reset water temperature to 4 on board tank temperature zones. Additional zones can be added using the Tank tN4 and
C Expansion terminals. Domestic Hot Water pre-heat is achieved by maintaining the DHW sensor S5 in the preheat storage
tank at an adjustable temperature, 90°F (32°C) default, using the DHW pump P6. The heat pump will target a water temperature
20°F (11°C) higher than the preheat tank target at the return sensor S2, and is limited by the HP RETURN MAX setting in the
Adjust Menu. An electric element in the system storage tank is switched on through an isolation relay with the backup relay on
the 406 to provide backup heat to maintain the Tank Sensor S4 at its target temperature.
Tank zones can have fan-coils, air handling units, chilled beams, or chilled panels as their terminal units depending on the type
of tekmarNet ® thermostat selected.
Legend
Application Settings
P2
HP Loop Pump
WATER TEMP
T (tank)
P4
Tank System Pump
BACKUP
AUX (auxiliary)
P6
DHW Pump
HP LOOP
INT (intermittent)
S1
Outdoor Sensor
HP TYPE
2STG (2-stage)
S2
HP Return Sensor
DHW MODE
5 (DHW preheat)
S4
Tank Sensor
S5
DHW Sensor
406
S1
tekmarNet ®2 Thermostats
Preheat
Storage Tank
DHW Out
S5
Electric
Water
Heater
Cold In
Coaxial
Heat Exchanger
Two Stage
Air to Water
Heat Pump
P6
S2
Z1
P4
P2
Freeze
Protection
Device
Z2
Z3
Z4
S4
Electric
Element
Backup
Expansion
Tank
11 of 48
© 2012
406_D - 11/12
Electrical
A406-1
tekmarNet ®2 Thermostats
tN2 tN2
DHW Sensor (S5)
tN2 tN2
tN2 tN2
tN2 tN2
R Y1 Y2 O
Two Stage
Air to Water
Heat Pump
Tank Sensor (S4)
Item
DHW
Call
H8009B
House Control 406
Zone 1
C Vlv
Zone 2
C Vlv
Zone 3
C Vlv
L1
L2
L
N
C
(Z2)
(Z3)
(Z4)
24 V (ac)
Transformer 009
Back of House Control 406
(P4)
Tank Sys
(black)
(black)
(P2)
HP Sys
(black)
(red)
Tank Sys Pump Mix Sys Pump
Boil Sys Pump
DHW Pump
HP Loop Pmp Transfer Pump
Pump
Power (L)
Pump
Power (L)
L
(blue)
(black)
(black)
DHW
(P6)
(black)
(red)
L
Variable
Speed Pump
N
N
to pump grounds
to pump grounds
L N G
G N
115 V (ac)
© 2012
6
5
4
3
7
8
1
2
003 Relay
Zone 4 Input Power
C Vlv C R
R
(Z1)
A1 A2
Stor. Tank
Element
Rc2 Y2
Setpoint
Call
Menu
240 V (ac)
Electric Element
Backup
Sensors - No Power
Tank Com Boil HPRt Com Out
Outdoor
Sensor
(S1)
Mod dc/mA Boil / Mix
Tank
+
tN4 C tN4 C
Mix/DHW tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2 Rc1 Y1 O/B
No Power Zone 1
Zone 2 Zone 3 Zone 4
Heat Pump
Return Sensor (S2)
L
115 V (ac)
406_D - 11/12
12 of 48
Mechanical
A406-2
Description: The House Control 406 operates two air source heat pumps in heating or cooling mode to supply an outdoor reset
water temperature to 4 on board mix temperature zones and 4 tank zones connected to the Tank expansion terminals with a
Wiring Center 314. An electric boiler supplies backup heat using the Backup relay and the Transfer Pump P7.
By setting HP LOOP to ON, the HP Loop Pump P2 will operate whenever there is a call on the tank or mix bus, or when the
transfer pump is on to ensure flow through the storage tank while heating or cooling.
Mixing is useful to separate the hot and cold water temperatures required for fancoils from the warm and cool temperatures
required for radiant floor heating and cooling. The Variable Speed Pump P1 is able to mix the water temperature down for
heating or mix the water temperature up above the dewpoint for floor cooling.
Legend
Application Settings
P1
Variable Speed Pump
WATER TEMP
T+MB (tank + mix + boiler)
P2
HP Loop Pump
ZONES 1-4
MIX
P5
Mix System Pump
BACKUP
XFER (transfer pump)
P7
Transfer Pump
BOIL TYPE
1STG (1 stage)
S1
Outdoor Sensor
HP LOOP
ON
S2
HP Return Sensor
HP TYPE
ROT (rotate)
S3
Boiler Sensor
DHW MODE
OFF
S4
Tank Sensor
S5
Mix Sensor
314
tekmarNet ®2 Thermostats
406
S1
tekmarNet ®2 Thermostats
S3
Backup:
Electric Boiler
Z5
2 Air to Water
Heat Pumps
Coaxial
Heat Exchanger
Freeze
Protection
Device
Z1
Z2
Z3
Z4
P7
S4
S2
Z6 Z7 Z8
P1
P5
S5
P2
Expansion
Tank
2-Port
Storage tank
13 of 48
© 2012
406_D - 11/12
Electrical
A406-2
Two
Air to Water
Heat Pumps
tekmarNet ®2 Thermostats
tN2 tN2
Mix Sensor (S5)
tN2 tN2
tN2 tN2
tN2 tN2
R
Y
O
C
R
Y
O
C
Tank Sensor (S4)
Boiler Sensor (S4)
7
8
1
2
Backup
DHW
Call
H8009B
Zone 2
C Vlv
Zone 3
C Vlv
tN4 Tank
Expansion
314
T
T
Rc2 Y2
Item
House Control 406
Zone 1
C Vlv
tN4
Setpoint
Call
Menu
6
5
4
3
003 Relay
C
Outdoor
Sensor
(S1)
Sensors - No Power
Tank Com Boil HPRt Com Out
Heat Pump Return
Sensor (S2)
Mod dc/mA Boil / Mix
Tank
+
tN4 C tN4 C
Mix/DHW tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2 Rc1 Y1 O/B
No Power Zone 1
Zone 2 Zone 3 Zone 4
Zone 4 Input Power
C Vlv C R
Electric Boiler
Backup
R
(Z1)
(Z2)
(Z3)
(Z4)
Back of House Control 406
(black)
(black)
(P2)
HP Sys
(black)
(red)
Tank Sys Pump Mix Sys Pump
Boil Sys Pump
DHW Pump
HP Loop Pmp Transfer Pump
Pump
Power (L)
Pump
Power (L)
L
(blue)
N
(P1)
Variable
Speed
L
N
C
24 V (ac)
Transformer 009
(black)
Mix Sys
(P5)
Transfer
(P7)
(black)
(black)
(red)
L
Variable
Speed Pump
N
to pump grounds
to pump grounds
L1 N1 G
G N2 L2
115 V (ac)
115 V (ac)
© 2012
406_D - 11/12
14 of 48
Mechanical
A406-3
Description: The House Control 406 operates a water source heat pump in heating or cooling mode to supply an outdoor reset
water temperature to 4 on board tank temperature zones. The 406 also operates a modulating condensing boiler to supply an
outdoor reset water temperature to 4 boiler zones connected to the Boil expansion terminals with a Wiring Center 313. The
boiler supplies backup heat to the tank loop using the transfer pump P7.
To allow the heat pump to operate for some amount of time before the transfer pump starts adding heat to the storage tank,
use the backup delay setting in the adjust menu. This ensures the heat pump is being used to its full potential before backup
is allowed. Placing the Transfer Pump P7 on the upstream side of the storage tank allows for hot water temperatures from the
boiler loop to be buffered by the storage tank to prevent sending hot water out to the tank temperature zones.
Tank zones can have fan-coils, air handling units, chilled beams, or chilled panels as their terminal units depending on the type
of tekmarNet ® thermostat selected.
Legend
Application Settings
P2
HP Loop Pump
WATER TEMP
T+B (tank + boiler)
P3
Boiler System Pump
ZONES 1-4
TANK
P4
Tank System Pump
BACKUP
XFER (transfer pump)
P6
DHW Pump
BOIL TYPE
0-10
P7
Transfer Pump
HP LOOP
INT
S1
Outdoor Sensor
HP TYPE
1STG
S2
HP Return Sensor
DHW MODE
2
S3
Boiler Sensor
S4
Tank Sensor
S5
DHW Sensor
313
406
tekmarNet 2 Thermostats
®
tekmarNet ®2 Thermostats
S1
DHW
S5
Setpoint
Backup:
Mod-Con
Boiler
P6
S3
Z5
Z6
Z7
Z8
P3
Z1
Z2
Z3
Z4
P7
Water-to Water
Heat Pump
P4
S4
Geo Field
S2
P2
Expansion
Tank
15 of 48
© 2012
406_D - 11/12
Electrical
A406-3
tekmarNet ®2 Thermostats
DHW Sensor (S5)
tN2 tN2
tN2 tN2
tN2 tN2
tN2 tN2
O
Y
R
Water-to Water
Heat Pump
Tank Sensor (S4)
Boiler Sensor (S3)
DHW
Call
H8009B
House Control 406
Zone 1
C Vlv
Zone 2
C Vlv
Zone 3
C Vlv
T
(Z3)
(P3)
(P2)
Tank Sys
Boil Sys
HP Sys
(black)
(black)
(black)
(red)
Tank Sys Pump Mix Sys Pump
Boil Sys Pump
DHW Pump
HP Loop Pmp Transfer Pump
Pump
Power (L)
Pump
Power (L)
L
(blue)
-
L
N
24 V (ac)
Transformer 009
(black)
(black)
DHW
(black)
Transfer
(P6)
(P7)
(red)
L
Variable
Speed Pump
N
N
to pump grounds
to pump grounds
L N G
G N
115 V (ac)
© 2012
+
(Z4)
Back of House Control 406
(P4)
313
Mod Con
Boiler
C
(Z2)
T
Zone 4 Input Power
C Vlv C R
R
(Z1)
tN4 Boil
Expansion
Backup
Item
Rc2 Y2
Menu
tN4
Setpoint
Call
Setpoint Call
C
Sensors - No Power
Tank Com Boil HPRt Com Out
Outdoor
Sensor
(S1)
Mod dc/mA Boil / Mix
Tank
+
tN4 C tN4 C
Mix/DHW tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2 Rc1 Y1 O/B
No Power Zone 1
Zone 2 Zone 3 Zone 4
Heat Pump
Return Sensor (S2)
L
115 V (ac)
406_D - 11/12
16 of 48
Mechanical
A406-4
Description: The House Control 406 operates a two stage water source heat pump in heating or cooling mode to supply an
outdoor reset water temperature to 4 on board tank temperature zones. The 406 also operates an on/off boiler to supply an
outdoor reset water temperature to 4 boiler zones connected to the Boil expansion terminals with a Wiring Center 314. The
boiler supplies backup heat to the tank loop using the variable speed pump P1.
To allow the heat pump to operate for some amount of time before the variable speed pump starts adding heat to the tank loop,
use the backup delay setting in the adjust menu. This ensures the heat pump is being used to its full potential before backup is
allowed. A non-condensing boiler may be used since P1 provides boiler return protection, preventing flue gas condensation.
Tank zones can have fan-coils, air handling units, chilled beams, or chilled panels as their terminal units depending on the type
of tekmarNet thermostat selected.
Legend
Application Settings
P1
Variable Speed Pump
WATER TEMP
T+B (tank + boiler)
P2
HP Loop Pump
ZONES 1-4
TANK
P3
Boiler System Pump
BACKUP
VAR (variable speed pump)
P4
Tank System Pump
BOIL TYPE
1STG (1 stage)
P6
DHW Pump
HP LOOP
INT
S1
Outdoor Sensor
HP TYPE
2STG
S2
HP Return Sensor
DHW MODE
2
S3
Boiler Sensor
S4
Tank Sensor
S5
DHW Sensor
314
tekmarNet 2 Thermostats
®
406
tekmarNet ®2 Thermostats
S1
DHW
S5
Z5
Backup:
On/Off
Boiler
Z6
Z7
Z8
P6
P3
S3
P1
Z1
Two Stage
Water to Water
Heat Pump
P4
Z2
Z3
Z4
S4
Geo Field
S2
Expansion
Tank
P2
17 of 48
© 2012
406_D - 11/12
Electrical
A406-4
tekmarNet ®2 Thermostats
tN2 tN2
DHW Sensor (S5)
tN2 tN2
tN2 tN2
tN2 tN2
R Y1 Y2 O
Two Stage
Water to Water
Heat Pump
Tank Sensor (S4)
Boiler Sensor (S3)
Backup
DHW
Call
H8009B
Zone 2
C Vlv
Zone 3
C Vlv
T
(Z3)
L
N
(Z4)
Back of House Control 406
(P4)
Tank Sys
(black)
(P3)
Boil Sys
(black)
HP Sys
(P2)
(black)
(red)
Tank Sys Pump Mix Sys Pump
Boil Sys Pump
DHW Pump
HP Loop Pmp Transfer Pump
Pump
Power (L)
Pump
Power (L)
L
(P1)
N
(blue)
Variable
Speed
On/Off
Boiler
Zone 4 Input Power
C Vlv C R
C
(Z2)
314
T
R
(Z1)
tN4 Boil
Expansion
Rc2 Y2
Item
House Control 406
Zone 1
C Vlv
tN4
Setpoint
Call
Menu
C
Outdoor
Sensor
(S1)
Sensors - No Power
Tank Com Boil HPRt Com Out
Heat Pump Return
Sensor (S2)
Mod dc/mA Boil / Mix
Tank
+
tN4 C tN4 C
Mix/DHW tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2 Rc1 Y1 O/B
No Power Zone 1
Zone 2 Zone 3 Zone 4
24 V (ac)
Transformer 009
(black)
(black)
DHW
(P6)
(black)
(red)
L
Variable
Speed Pump
N
to pump grounds
to pump grounds
L1 N1 G
G N2 L2
115 V (ac)
115 V (ac)
© 2012
406_D - 11/12
18 of 48
Mechanical
A406-5
Description: The House Control 406 operates two water source heat pumps in heating or cooling mode to supply an outdoor
reset water temperature to 4 on board mix temperature zones and 4 tank zones connected to the Tank expansion terminals
with a Wiring Center 313. The 406 also operates a modulating condensing boiler to supply an outdoor reset water temperature
to 4 boiler zones connected to the Boil expansion terminals with a Wiring Center 314. The boiler supplies backup heat to the
tank loop using the transfer pump P7.
Mixing is useful to separate the hot and cold water temperatures required for fancoils from the warm and cool temperatures
required for radiant floor heating and cooling. The Variable Speed Pump P1 is able to mix the water temperature down for
heating or mix the water temperature up above the dewpoint for floor cooling.
IMPORTANT
• When a three water temperature application is selected (WATER TEMP = T+MB), either the Mix or Boiler bus is limited to
the 4 tN2 on board thermostats, and the gateway controls 482 and 483 are unable to communicate to the four on-board tN2
zones on the House Control 406.
Legend
P1
Variable Speed Pump
S5
Mix Sensor
P2
HP Loop Pump
A1
DHW Aquastat
P3
Boiler System Pump
P4
Tank System Pump
P5
Mix System Pump
WATER TEMP
T+MB (tank + mix + boiler)
P6
DHW Pump
ZONES 1-4
MIX
P7
Transfer Pump
BACKUP
XFER (transfer pump)
S1
Outdoor Sensor
BOIL TYPE
0-10
S2
HP Return Sensor
HP LOOP
INT
S3
Boiler Sensor
HP TYPE
ROT (rotate)
S4
Tank Sensor
DHW MODE
4
Application Settings
314
406
313
tekmarNet ®2 Thermostats
tekmarNet ®2 Thermostats
S1
tekmarNet ®2 Thermostats
A1
Z9
Backup:
Mod Con
Boiler
Z10 Z11 Z12
Z5
S3
Z6
Z7
Z8
P6
P3
Z1
S4
S2
Z3
Z4
P4
P7
Two
Water to Water
Heat Pumps
Z2
P1
P5
S5
P2
Expansion
Tank
19 of 48
© 2012
406_D - 11/12
Electrical
A406-5
Two Water to Water Heat Pumps
R
Y
O
C
R
Y
O
C
tekmarNet ®2 Thermostats
tN2 tN2
Mix Sensor (S5)
tN2 tN2
tN2 tN2
tN2 tN2
Boiler Sensor (S3)
003
Mix/DHW tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2 Rc1 Y1 O/B
No Power Zone 1
Zone 2 Zone 3 Zone 4
H8009B
T
(Z3)
Boil Sys
(P3)
HP Sys
(P2)
(black)
(black)
(red)
Tank Sys Pump Mix Sys Pump
Boil Sys Pump
DHW Pump
HP Loop Pmp Transfer Pump
Pump
Power (L)
Pump
Power (L)
L
(P1)
N
(blue)
Variable
Speed
314
-
(Z4)
Back of House Control 406
(black)
tN4 Boil
Expansion
L
N
C
Tank Sys
313
Mod Con
Boiler
R
(Z2)
+
Zone 4 Input Power
C Vlv C R
DHW Call
(Z1)
tN4 Tank
Expansion
Backup
Zone 3
C Vlv
T
Rc2 Y2
DHW
Call
Zone 2
C Vlv
tN4
Item
House Control 406
Zone 1
C Vlv
C
Setpoint
Call
Menu
tN4
Mod dc/mA Boil / Mix
Tank
+
tN4 C tN4 C
C
Outdoor
Sensor
(S1)
Sensors - No Power
Tank Com Boil HPRt Com Out
Heat Pump Return
Sensor (S2)
(P4)
6
5
4
3
7
8
1
2
Tank Sensor (S4)
24 V (ac)
Transformer 009
(black)
Mix Sys
(P5)
(black)
DHW
(P6)
(black)
Transfer
(P7)
(red)
L
Variable
Speed Pump
N
to pump grounds
to pump grounds
L1 N1 G
G N2 L2
115 V (ac)
115 V (ac)
See page 40 for details on common modulating boiler settings.
© 2012
406_D - 11/12
20 of 48
User Interface
Display
Item Field
Menu Field
Displays the name
of the selected item
Displays the
current menu
Number Field
Status Fields
Displays the current status
of the control’s inputs,
outputs and operation. Most
symbols in the status field
are only visible when the
VIEW Menu is selected
Displays the
current value of
the selected item
Var
Setpoint
Xfr
Aux
Symbols
Calls
CALLS
Displays any call for heat or cool the control
is receiving.
Pumps
PUMPS
Displays any pump currently operating.
HEAT PUMP
Heat pump stage 1 or 2 is operating.
Aux
Zones
1234
ZONES
Displays if an on-board zone is operating.
Var
VARIABLE SPEED PUMP OUTPUT
Displays percent output of the variable speed
pump.
WWSD / CWSD
The system is currently in Warm Weather Shut
Down or Cold Weather Shut Down.
MIN / MAX
Heat pump is prevented from operating due
to high or low return water temperature.
OCCUPIED
°F°C minhr
Indicates that a User Switch or Timer has put
sec%
the system into Occupied.
UNOCCUPIED
Indicates that a User Switch or Timer has put
the system into UnOccupied.
AUXILIARY
An auxiliary backup heat source is currently
operating using the Backup relay.
BOILER
Indicates that the boiler is operating (flashing
flame indicates boiler is igniting).
FLOOR
Radiant floor cooling is currently active.
BACKUP
Backup heat source is required to assist in
heating the tank sensor to its target.
COOL / HEAT
The heat pump is operating in either cool or
heat mode.
°F, °C, MINUTES, HOURS, SECONDS, %
Units of measurement for current number.
WARNING
Displays if an error exists on the system.
Navigating The Display
The 406 uses a simple user interface to accomplish a variety
of functions. The four buttons beneath the display are used
to change the menu, sort through Items, and adjust each
setting as required.
Menu Button ---------------------------------------------------------------------------------------------------------------------------------------------------------The menus display in the Menu Field at the top left side of
the LCD. Four menus are available: View, Adjust, Monitor and
Toolbox (identified by the wrench symbol).
• The View menu allows the user to view the current status
of various system parameters.
• The Adjust menu allows the installer to adjust settings to
21 of 48
ensure control operation matches requirements of the mechanical system.
• The Monitor menu keeps track of run times and other important data that is collected during system operation.
• The Toolbox menu is a source of system information and
includes useful tools for commissioning and testing the
system.
© 2012
406_D - 11/12
Item Button --------------------------------------------------------------------------------------------------------------------------------------------------------Each menu contains a list of Items that can be viewed and, in
some cases, adjusted. Press the item button to scroll through
the list in each Menu.
• 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.
Up and Down Buttons ---------------------------------------------------------------------------------------------------------------------------------------------The Up and Down buttons are primarily used for adjusting
settings.
To adjust a setting:
• Select the appropriate menu using the Menu button.
• Select the item using the Item button.
• Use the Up or Down button to make the adjustment.
Default Item ------------------------------------------------------------------------------------------------------------------------------------------------------When navigating menus, the display reverts back to the default
item (View Menu) after 60 seconds of button inactivity.
• To set the default item in the View menu, display the item
for more than five seconds.
Access Levels and Thermostat Lock
The 406 is shipped pre-programmed with common settings.
The 406 has an ‘Installer’ access level that allows full access
to all settings and a ‘User’ access level that restricts the
number of settings available. The 406 defaults to the ‘User’
access level after 12 hours of operation.
All thermostats are locked while the 406 is in the ‘User’ access
level. Certain settings on the thermostat will be unavailable
while the thermostat is locked.
To change to the ‘Installer’ access level and Unlock the
thermostats:
• In the Toolbox menu, locate Access
• Adjust the access level to ‘Installer’ by pressing the up or down
button. This will permit setting changes to the control.
Programming and Settings
The 406 settings can be found in the ‘Adjust’ menu. When
changing the items value, the setting is saved to the control’s
memory once the Item button is pressed to advance to the
next item, or after 60 seconds, the control times out and
reverts back to the ‘View’ menu.
All settings are stored in permanent memory and will be kept
correctly during any loss of power.
View Menu (1 of 3)
The View menu items display the current operating temperatures and status information of the system.
Item Field
© 2012
Range
Description
– – –, -76 to
149°F
(-60 to 65°C)
OUTDOOR
SECTION D
Current outdoor air temperature as measured by the local or remote outdoor sensor.
The outdoor air temperature is shared to all thermostats in the tekmarNet ® system.
“– – –” is displayed when no outdoor sensor is available.
– – –, -22 to
266°F
(-30 to 130°C)
BOILER
SECTION D
Current boiler supply water temperature as measured by the boiler sensor. The
control operates the boiler so that the boiler supply is within the boiler differential
of the boiler target. “– – –” is displayed when no boiler sensor is available.
Note: This item is only available when a boiler water temperature is selected.
– – –, 35 to
200°F
(1.5 to 93.0°C)
BOILER TARGET
SECTION D
The boiler target is the temperature the control is currently trying to maintain at the
boiler supply sensor. The boiler target is calculated based on the outdoor design,
boiler design, and boiler minimum settings. “– – –” is displayed when no heat is
required for boiler zones.
Note: This item is only available when a boiler water temperature is selected.
406_D - 11/12
22 of 48
View Menu (2 of 3)
Item Field
Range
Description
0-100%
BOILER MODULATION
SECTION G
Current percent modulation of the boiler’s burner. The boiler modulation increases
when the boiler supply is less than the boiler target. The boiler modulation
decreases when the boiler supply is greater than the boiler target.
Note: This item is only available when the BOIL TYPE setting is set to 0-10 or 4-20.
– – –, -22 to
266°F
(-30 to 130°C)
MIXING
SECTION D
Current mix supply water temperature as measured by the mix sensor. The control
operates the variable speed pump so that the mix supply is equal to the mix target.
“– – –” is displayed when no mix sensor is available.
Note: This item is only available when a mix water temperature is selected.
– – –, 35 to
200°F
(1.5 to 93.0°C)
MIX TARGET
SECTION D
The temperature the control is currently trying to maintain at the mix sensor. The mix
target is calculated based on the outdoor design and mix design settings. “– – –” is
displayed when no heat is required for mix zones.
Note: This item is only available when a mix water temperature is selected.
– – –, -22 to
266°F
(-30 to 130°C)
TANK
SECTION D
Current tank supply water temperature as measured by the tank sensor. The control
operates the heat pump and backup so that the tank supply is equal to the tank
target. “– – –” is displayed when no tank sensor is available.
– – –, 35 to
200°F
(1.5 to 93.0°C)
TANK TARGET
SECTION D
The temperature the control is currently trying to maintain at the tank sensor. The tank
target is calculated based on the outdoor design and tank design settings. “– – –” is
displayed when no heat is required for tank zones.
– – –, -22 to
266°F
(-30 to 130°C)
DOMESTIC HOT WATER
SECTION F
Current Domestic Hot Water tank temperature as measured by the optional DHW
sensor. If the DHW tank temperature falls 6°F (3.0°C) below the DHW Occ setting,
a DHW call is created and the tank is heated. “– – –” is displayed when no DHW
sensor is available.
Note: This item is only available when a DHW sensor is installed and DHW Mode
is set to 1 to 5.
– – –, -22 to
266°F
(-30 to 130°C)
HEAT PUMP
SECTION E
Current heat pump return water temperature as measured by the HP Return sensor.
The control operates the heat pump when the HP Return temperature is below the
HP RETURN MAX setting in heating and above the HP RETURN MIN setting in
cooling. “– – –” is displayed when no heat pump return sensor is available.
– – –, -35 to
273°F
(-37 to 134°C)
DEW POINT
SECTION C
Highest dewpoint of all network humidity sensors. “– – –” is displayed when no dew
point sensor is available.
Note: This item is only available when a humidity sensor has been detected on
the network and the access level is set to installer.
SYSTEM IN AWAY
The heating system is in the Away scene. The DHW tank will not be heated.
Setpoint calls are still responded to.
Use the User Switch to change scene out of Away.
PURGING HEAT
Heat is being purged from the storage tank and the heat pump is not allowed to
come on. This may continue for up to 30 minutes and then precool will begin.
23 of 48
© 2012
406_D - 11/12
View Menu (3 of 3)
Item Field
Range
Description
PRECOOL TANK
The heat pump is cooling the storage tank while the zones remain off. This may
continue for up to 30 minutes and then the zones are allowed to call for cooling.
PURGING COOL
Cool water is being purged from the storage tank and the heat pump is not allowed
to come on. This may continue for up to 30 minutes and then preheat will begin.
PREHEAT TANK
The heat pump is heating the storage tank while the zones remain off. This may
continue for up to 30 minutes and then the zones are allowed to call for heating.
Adjust Menu (1 of 6)
The Adjust menu items are the programmable settings used to determine what type of system to operate.
Item Field
Range
AUTO,
COOL,
HEAT,
BKUP,
OFF
Default = AUTO
Access: User
Set to:
T, T+M, T+B, T+MB
Default = T
Access: Installer
Set to:
TANK, BOIL, MIX
Default = TANK
Access: Installer
Set to:
GEO, AIR
Default = GEO
Access: Installer
Set to:
1STG, 2STG, ROT
Default = 1STG
Access: Installer
Set to:
© 2012
406_D - 11/12
Description
MODE
SECTION C
AUTO - Automatic heat pump switchover between heating and cooling. Boiler
or backup heat is brought on automatically as needed for DHW/Setpoint loads
and space heating.
COOL - Heat pump only operates in cooling mode. Backup heat only operates
for DHW/Setpoint loads.
HEAT - Heat pump only operates in heating mode. Boiler or backup heat is brought
on automatically as needed for DHW/Setpoint loads and space heating.
BKUP - Heat pump is disabled. Boiler or backup heat is brought on automatically
as needed for DHW/Setpoint loads and space heating.
OFF - Heat pump is disabled. Boiler or backup heat is disabled.
WATER TEMPERATURE
T - Only a tank loop is configured.
T + B - Tank and boiler loops are configured.
T + M - Tank and mix loops are configured.
T + MB - Tank, mix, and boiler loops are configured.
SECTION B
ZONES 1-4
SECTION B
Selects which water temperature zones 1-4 are associated with.
TANK - links zones 1-4 to the tank loop.
BOIL - links zones 1-4 to the boiler loop.
MIX - links zones 1-4 to the mixing loop.
Note: This setting is not adjustable when Water Temperature is set to T (tank).
HEAT PUMP SOURCE
SECTION E
Select whether the heat pump is an air-source (AIR) or water-source (GEO) heat
pump.
HEAT PUMP TYPE
SECTION E
1STG - operates a single stage heat pump.
2STG - operates a two-stage heat pump.
ROT - operates two heat pumps and rotates them every 48 hours difference in
run time.
24 of 48
Adjust Menu (2 of 6)
Item Field
Range
Description
BACKUP
NONE, AUX,
XFER, VAR
Default = NONE
Access: Installer
Set to:
1STG,
0-10,
4-20,
EMS1,
EMS2
Default = 1STG
Access: Installer
Set to:
-60 to 45°F
(-51 to 7°C)
Default = 10°F
(-12°C)
Access: Installer
Set to:
SECTION B
NONE - No backup heat source is available.
AUX - An auxiliary heat source (electric or instantaneous water heater) is either
inside or in-line with the storage tank.
XFER - A boiler is the backup heat source. Backup heat is transferred from the
boiler loop to the heat pump loop with the transfer pump.
VAR - A boiler is the backup heat source. Backup heat is transferred from the
boiler loop to the tank loop with the variable speed pump.
Note: If boil and mix water temperatures are configured, this item is automatically
set to XFER and is no longer displayed.
BOILER TYPE
SECTION B
The type of boiler connected to the control.
1STG - single one-stage on-off boiler
0-10 - 0-10 V (dc) modulating boiler
4-20 - 4-20 mA modulating boiler
EMS1 - tekmar boiler staging controls
EMS2 - Viessmann modulating boilers
Note: This item is only available when a boil water temperatures have been
selected.
OUTDOOR DESIGN
SECTION D
The outdoor air temperature used in the heating curves that determine the
tank, mix, and boiler target temperatures. Typically set to the temperature of
the coldest day of the year.
TANK DESIGN
70 to 200°F
(21 to 93.5°C)
Default = 110°F
(43.5°C)
Access: Installer
Set to:
OFF, 70 to 110°F
(21 to 43.5°C)
Default = OFF
Access: Installer
Set to:
SECTION D
The supply water temperature required for the tank zones to heat the building on
the typical coldest day of the year. Recommendations:
• High mass radiant floor = 120°F (50°C)
• Low mass radiant floor = 140°F (60°C)
• Fancoil or air handling unit = 190°F (90°C)
• Copper fin-tube convector = 180°F (80°C)
• Radiators = 160°F (70°C)
• Low profile baseboard = 150°F (65°C)
TANK MINIMUM
SECTION D
The minimum allowed tank target temperature. This only applies when a zone
on the tank bus calls for heat.
MIX DESIGN
70 to 200°F
(21.0 to 93.5°C)
Default = 110°F
(49°C)
Access: Installer
Set to:
SECTION D
The supply water temperature required for the mix zones to heat the building on
the typical coldest day of the year. Recommendations:
• High mass radiant floor = 120°F (50°C)
• Low mass radiant floor = 140°F (60°C)
• Fancoil or air handling unit = 190°F (90°C)
• Copper fin-tube convector = 180°F (80°C)
• Radiators = 160°F (70°C)
• Low profile baseboard = 150°F (65°C)
Note: This item is only available when a mix water temperature has been
selected.
25 of 48
© 2012
406_D - 11/12
Adjust Menu (3 of 6)
Item Field
Range
Description
BOILER DESIGN
70 to 200°F
(21 to 93.5°C)
Default = 180°F
(82°C)
Access: Installer
Set to:
OFF, 80 to 180°F
(26.5 to 82°C)
Default = 140°F
(60°C) if BOIL
TYPE = 1STG
SECTION D
The supply water temperature required for the boiler zones to heat the building
on the typical coldest day of the year. Recommendations:
• High mass radiant floor = 120°F (50°C)
• Low mass radiant floor = 140°F (60°C)
• Fancoil or air handling unit = 190°F (90°C)
• Copper fin-tube convector = 180°F (80°C)
• Radiators = 160°F (70°C)
• Low profile baseboard = 150°F (65°C)
Note: This item is only available when a boil water temperature has been
selected.
BOILER MINIMUM
SECTION D
The minimum allowed boiler target temperature and temperature at which the
mixing device begins to provide boiler protection against cold return water
temperatures. The variable speed pump operates at low percent output when the
boiler supply temperature drops below this setting. Recommendations:
• Condensing gas or electric boiler = OFF
Default = OFF if BOIL
• Non-condensing gas and oil boilers = 140°F (60°C)
TYPE = 0-10, 4-20,
Note: This item is only available when a boil water temperature has been selected.
EMS1, or EMS2 If Boiler Type is 0-10 V (dc), 4-20 mA, EMS1 or EMS2, this setting is defaulted
to Off. The mixing device does not provide boiler protection when Boiler Type is
Access: Installer
set to EMS1 or EMS2.
Set to:
10 to 230 seconds
Default = 30
BOILER MOTOR SPEED
SECTION G
seconds
Time in seconds from full-close to full-open of modulating boiler actuator.
Note: Item is only available when BOIL TYPE is set to 0-10 or 4-20.
Access: Installer
Set to:
0 to 50%
Default = 0%
Access: Installer
Set to:
0:00 to 3:00
minutes
Default = 0:10 minutes
Access: Installer
Set to:
40 to 100°F
(4.5 to 38°C)
Default = 70°F
(21°C)
Access: User
Set to:
40 to 100°F
(4.5 to 38°C)
Default = 60°F
(15.5°C)
Access: User
Set to:
10 to 180 minutes
Default = 30 minutes
Access: Installer
Set to:
© 2012
406_D - 11/12
BOILER MINIMUM MODULATION
SECTION G
Minimum physical output to modulating boiler.
Note: Item is only available when BOIL TYPE is set to 0-10 or 4-20.
BOILER MODULATION DELAY
SECTION G
Modulating boiler stays at MIN MOD output for this length of time before beginning
to modulate to control temperature.
Note: Item is only available when BOIL TYPE is set to 0-10 or 4-20.
WWSD OCCUPIED
SECTION D
The system’s Warm Weather Shut Down temperature during Occupied periods
or when a schedule is not used.
WWSD UNOCCUPIED
SECTION D
The system’s Warm Weather Shut Down temperature during Unoccupied
periods.
Note: Item is only available when a schedule or User Switch is present on the
system.
INTERLOCK
SECTION C
Set the minimum delay between the heat pump switching from heat to cool or
cool to heat.
Note: The interlock delay only applies when the MODE is set to AUTO.
26 of 48
Adjust Menu (4 of 6)
Item Field
Range
35 to 70°F
(4 to 21°C)
Default = 50°F
(10°C)
Access: Installer
Set to:
Description
COOL SETPOINT
SECTION D
Tank setpoint that will be maintained when in cooling mode (not for floor
cooling).
ON, OFF
Default = ON
Access: Installer
Set to:
DEW POINT
SECTION C
ON - a humidity sensor is required in order to operate floor cooling.
OFF - no humidity sensor is required to perform floor cooling. The floor-cooling
supply target will be the value of the COOL MINIMUM setting.
OFF, 40 to 75°F
(4.5 to 24°C)
Default = 60°F
(15.5°C)
Access: Installer
Set to:
COOL MINIMUM
O, B
Default = O
Access: Installer
Set to:
2 to 20°F
(1 to 11°C)
Default = 4°F
Access: Installer
Set to:
AUTO, 2:00 to
20:00 minutes
Default = AUTO
Access: Installer
Set to:
INTR, ON
Default = INTR
Access: Installer
Set to:
70 to 180°F
(21 to 82°C)
Default = 100°F
(38°C)
Access: Installer
Set to:
SECTION C
Minimum supply temperature to deliver when:
• Performing floor cooling for a loop
• Limiting a zone’s target supply temperature based on dewpoint
considerations.
The target for floor-cooling or dewpoint limiting is calculated as the higher of:
• 2 °F above the dewpoint or this setting.
SWITCHOVER
SECTION E
O - Close O/B contacts to operate heat pump in cool mode.
B - Close O/B contacts to operate heat pump in heat mode.
HEAT PUMP DIFFERENTIAL
SECTION E
Differential around the tank sensor which the heat pump will cycle its compressor
(half above and half below target).
HEAT PUMP 2 DELAY
SECTION E
The minimum time delay between the Y1 and Y2 stages of the heat pump.
Note: Item is only available when HP TYPE = 2STG or ROT.
HP LOOP
SECTION B
INTR - The HP Loop Pump will operate together with the heat pump including
pre & post purge
ON - The HP Loop Pump will operate whenever heat is being drawn from or
pushed into the tank:
•
•
•
•
When heat pump operates including pre & post purge
When there is a tank call
When there is a mix call
When the transfer pump is running
HP RETURN MAXIMUM
SECTION E
Prevents the heat pump from operating in heating mode if the heat pump return
temperature exceeds this setting.
27 of 48
© 2012
406_D - 11/12
Adjust Menu (5 of 6)
Item Field
Range
30 to 70°F
(1 to 21°C)
Default = 40°F
(4.5°C)
Access: Installer
Set to:
OFF, -10 to 60°F
(-23.5 to 15.5°C)
Default = OFF
Access: Installer
Set to:
OFF, 35 to 100°F
(OFF, 1.5 to 38.0°C)
Default = OFF
Access: Installer
Set to:
0:30 to 10:00
minutes
Default = 5:00
minutes
Access: Installer
Set to:
0:30 to 10:00
minutes
Default = 5:00
minutes
Access: Installer
Set to:
10 to 180 minutes,
OVR
Default = 60 minutes
Access: Installer
Set to:
Description
HP RETURN MINIMUM
BALANCE POINT
100 to 200°F
(38 to 93.5°C)
Default = 180°F
(82°C)
Access: Installer
Set to:
© 2012
406_D - 11/12
SECTION E
Prevents the heat pump from operating in heating mode if the outdoor air
temperature falls below this setting.
Note: This item is only available when HP SOURCE = AIR.
Y COOLING CWSD
SECTION E
Prevents the heat pump from operating in cooling mode if the outdoor air
temperature falls below this setting (Cold Weather Shut Down).
Y MINIMUM RUN-TIME
SECTION E
Minimum compressor run-time for the heat pump.
Y MINIMUM OFF-TIME
Minimum compressor off-time for the heat pump.
SECTION E
BACKUP DELAY
SECTION E
The time that heat pump(s) have to run at full output before the backup heat
source is called upon.
OVR (override) - When selected, the backup source will not be called upon for
heat unless the MODE is set to BKUP or the heat pump is locked out on high
return temperature or outdoor temperature.
Note: This item is only available when BACKUP is set to other than NONE.
DHW MODE
OFF, 1, 2, 3, 4, 5
Default = OFF
Access: Installer
Set to:
SECTION E
Prevents the heat pump from operating in cooling mode if the heat pump return
temperature falls below this setting.
SECTION F
Sets the mode of DHW operation:
OFF - No DHW generation.
1 - Parallel piping with no priority
2 - Parallel piping with priority.
3 - Primary/secondary piping with no priority
4 - Primary/secondary piping with priority
5 - DHW pre-heat
Note: Modes 1-4 are only available when the WATERTEMP item has been set to T+B
or T+MB. Mode 5 is only available when the WATERTEMP item has been set to T.
DHW EXCHANGE
Boiler target required to satisfy a DHW demand.
Note: Item is only available when the DHW Mode is set to 1 to 4.
28 of 48
SECTION F
Adjust Menu (6 of 6)
Item Field
Range
70 to 180°F
(21 to 82°C)
Default = 125°F
(51.5°C) If DHW
MODE = 1-4
Default = 90°F (32°C)
If DHW MODE = 5
Access: Installer
Set to:
ON, OFF
Default = ON
Access: Installer
Set to:
60 to 200°F
(15.5 to 93.5°C)
Default = 180°F
(82°C)
Access: Installer
Set to:
°F or °C
Default = °F
Access: User
Set to:
Description
DHW OCCUPIED
SECTION F
Selects the temperature of the indirect DHW tank when DHW MODE = 1-4.
Selects the temperature of the DHW pre-heat tank when DHW MODE = 5.
Note: Item is only available when a DHW sensor is installed and the DHW
Mode is set to 1 to 5.
DHW UNOCCUPIED
SECTION F
Selects whether or not the indirect DHW tank should be heated to during
Unoccupied time periods.
Note: Item is only available when a DHW sensor is installed, the DHW Mode is set
to 1 to 5 and a schedule is available or a User Switch is present on the system.
SETPOINT
Boiler target to satisfy a setpoint demand.
SECTION H
UNITS
Selects units for temperature display.
Monitor Menu (1 of 2)
The Monitor menu items provide information about the system’s operation and performance. To clear any item back to
default, press and hold the Up and Down buttons while viewing that item.
Item Field
Range
Description
-76 to 149°F
(-60.0 to 65.0°C)
Access: User
OUTDOOR LOW
-76 to 149°F
(-60.0 to 65.0°C)
Access: User
OUTDOOR HIGH
0 to 9999 Hours
Default = 0 hr
Access: User
RUN TIME (HEAT PUMP STAGE 1)
0 to 9999 Hours
Default = 0 hr
Access: User
RUN TIME (HEAT PUMP STAGE 2)
0 to 9999 Hours
Default = 0 hr
Access: User
RUN TIME (BOILER)
Records the lowest outdoor temperature since the item was last reset. Press
and hold the Up and Down buttons while viewing to reset.
Records the highest outdoor temperature since the item was last reset. Press
and hold the Up and Down buttons while viewing to reset.
The total ‘on’ time of the Y1 relay since the item was last reset. Press and hold
the Up and Down buttons while viewing to reset.
The total ‘on’ time of the Y2 relay since this item was last reset. Press and hold
the Up and Down buttons while viewing to reset.
Note: Item is only available when HP TYPE = 2STG or ROT.
The total ‘on’ time of the backup relay since the item was last reset. Press and
hold the Up and Down buttons while viewing to reset.
Note: Item is only available when WATERTEMP = T + B or T+MB.
29 of 48
© 2012
406_D - 11/12
Monitor Menu (2 of 2)
Item Field
Range
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (AUXILIARY)
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (TRANSFER PUMP)
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (VARIABLE SPEED PUMP)
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (HP LOOP PUMP)
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (TANK PUMP)
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (MIX SYSTEM PUMP)
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (BOIL SYSTEM PUMP)
0 to 9999 Hours
Default = 0 hr
Access: Installer
RUN TIME (DHW PUMP)
Aux
Xfr
Var
– – –, -35 to 273°F
(-37 to 134°C)
Access: Installer
– – –, -35 to 273°F
(-37 to 134°C)
Access: Installer
– – –, -35 to 273°F
(-37 to 134°C)
Access: Installer
© 2012
Description
406_D - 11/12
The total ‘on’ time of the Backup relay since the item was last reset. Press and
hold the Up and Down buttons while viewing to reset.
Note: Item is only available when BACKUP = AUX.
The total running time of the Transfer Pump since the item was last reset. Press
and hold the Up and Down buttons while viewing to reset.
Note: Item is only available when BACKUP = XFER
The total running time of the Variable Speed Pump since the item was last reset.
Press and hold the Up and Down buttons while viewing to reset.
Note: Item is only available when BACKUP = VAR.
The total running time of the HP Loop Pump since the item was last reset. Press
and hold the Up and Down buttons while viewing to reset.
The total running time of the Tank System Pump since this item was last reset.
Press and hold the Up and Down buttons while viewing to reset.
The total running time of the Mix System Pump since this item was last reset.
Press and hold the Up and Down buttons while viewing to reset.
Note: Item is only available when WATERTEMP = T + M or T + MB.
The total running time of the Boil System Pump since this item was last reset.
Press and hold the Up and Down buttons while viewing to reset.
Note: Item is only available when WATERTEMP = T + B or T + MB.
The total running time of the DHW Pump since this item was last reset. Press
and hold the Up and Down buttons while viewing to reset.
Note: Item is only available when DHW MODE ≠ OFF.
DEW POINT MIX
Highest dewpoint of all humidity sensors on the mix loop.
Note: Item is only available when WATERTEMP = T + M or T + MB and a
humidity sensor has been detected on the mix bus.
DEW POINT TANK
Highest dewpoint of all humidity sensors on the tank loop.
Note: Item is only available when a humidity sensor has been detected on
the tank bus.
DEW POINT BOIL
Highest dewpoint of all humidity sensors on the boiler loop.
Note: Item is only available when WATERTEMP = T + B or T + MB and a
humidity sensor has been detected on the boiler bus.
30 of 48
Toolbox Menu (1 of 1)
The Toolbox Menu is a location for system information and Test functions. If any errors are present on the system,
they will be located at the beginning of this menu.
Item Field
Range
Description
ON or OFF
Default = OFF
Access: Installer
USER TEST
ON or OFF
Default = OFF
Access: Installer
MAX HEAT
Flashes Between
J12 09A to 09Z
Access: User
TYPE AND SOFTWARE VERSION
INST (Installer)
or USER
Default = INST
Access: User
OFF, SEL
Default = Off
Access: Installer
0 to 4 devices
Access: Installer
0 to 24 devices
Access: Installer
Begins the test routine which tests the main control’s functions. See the Testing
the Control section for more details. Use the up button to turn the User Test
On.
When selected, control operates the system up to maximum set temperatures.
Will operate up to 24 hours, or can be manually turned Off. See the Max Heat
section for more details.
Displays the type number of the product, followed by the current software
version beneath.
ACCESS LEVEL
Selects the access level of the control, which determines the Menu items
available. USER provides the most limited level of access and shows the fewest
possible items.
When set to USER, all thermostats are locked and the number of thermostat
settings available are reduced.
FACTORY DEFAULTS
Loads the factory default settings. Hold the Up and Down buttons for 1 second
until SEL is shown.
ZONE 1-4 DEVICES
Displays the number of tN2 thermostats connected to the House Control on zones
1-4. These thermostats could be assigned to be on the Tank, Mix or Boil bus.
TANK DEVICES
Displays the number of devices connected to the Tank bus expansion terminals,
tN4 and C.
MIX DEVICES
0 to 24 devices
Access: Installer
Displays the number of devices connected to the Mix bus expansion terminals,
tN4 and C.
Note: Item is only available when the Mix bus is enabled.
BOIL DEVICES
0 to 24 devices
Access: Installer
Displays the number of devices connected to the Boil bus expansion terminals,
tN4 and C.
Note: Item is only available when the Boil bus is enabled.
See Troubleshooting
Guide
Access: Installer
HISTORY 1-5
Displays a history of any past errors that have occurred on the system. Will clear
after 30 days, or press Up and Down buttons for 1 second to manually clear.
The last 5 history items will display if present.
31 of 48
© 2012
406_D - 11/12
Sequence of Operation
Section A
tekmarNet® System
tekmarNet® is a family of products that use communication to
operate the HVAC system in a comfortable and efficient manner.
The House Control is the central component in a tekmarNet ®
system and requires tekmarNet ®2 (tN2) Thermostats to be
directly connected to the control.
The tekmarNet®4 (tN4) Expansion terminals can link the House
Control with other tekmarNet ® components:
•
•
•
•
Wiring Centers 313, 314, 315, 316 - Add additional zones
tN2 and tN4 Thermostats - Add thermostats
tN4 Timer 033 - Adds 4 programmable schedules
tN4 User Switch 479 - Provides a system override for vacations and holidays
• tN4 Setpoint Control 161 - Control hot tubs, pools and more
Section B
System Setup
Selecting Water Temperatures (Bus) -----------------There are three possible water temperatures that the House
Control 406 can operate and they are called:
• Tank (T)
• Mix (M)
• Boil (B)
The Tank water temperature must always be used and is common
to all applications. The Mix and/or Boil water temperatures
can be added according to the system requirements. Use
the WATERTEMP setting in the Adjust Menu to configure the
proper water temperatures for the application. The following
table references application drawings with different water
temperatures selected.
Application
A406-1
A406-2
A406-3
A406-4
A406-5
AUX (Auxiliary)
An electric resistance element in the storage tank, or some
other auxiliary heat source is the backup. Once enabled,
the Backup relay will operate with a 10°F (5.5°C) differential
around the tank target temperature while applying a 30 second
minimum on and off time.
Tank
Sensor
HP Return
Sensor
To
System
Electric
Element
Backup
Expansion
Tank
For an electric water heater as backup, see A406-1.
Water Temperatures
Tank
Tank & Mix & Boil
Tank & Boil
Tank & Mix & Boil
Assign Zones 1-4 -------------------------------------There are four tN2 zones on the House Control 406 that have
a 24 V (ac) output to operate a zone valve. These zones can
be set to the tank, mix or boil temperature using the ZONE
1-4 setting in the adjust menu. The available options change
depending on the WATER TEMPERATURE setting.
NOTE: When the WATER TEMPERATURE setting is set to
tank plus mix and boil, the Mix or Boiler bus is limited to the 4
on-board connections to the 406. This configuration isolates
the 4 on-board zones from communicating with the Gateway
482 or 483.
XFER (Transfer Pump)
A boiler is the backup heat source. Backup heat is transferred
from the boiler loop to the heat pump loop with the Transfer
pump. This is only selectable if a boiler water temperature has
been configured. Once enabled, the Transfer pump and Boiler
pump will operate with a 10°F (5.5°C) differential around the
tank target temperature while applying a 30 second minimum
on and off time. The boiler will cycle to maintain its target.
It is useful to pipe the boiler on the upstream side of the storage
tank to buffer any high water temperatures coming from the
boiler loop from going directly into the tank zones.
Note: Boiler return protection is not available when selecting
this type of backup.
Boiler
Sensor
Transfer
Pump
Selecting a Backup -------------------------------------A backup heat source is required to satisfy the heating load
if the heat pump cannot maintain the tank target. If the heat
pump can no longer operate in heating mode or if it has run at
full output for the BKUP DLY time, the backup is called upon
for heating. The BACKUP setting in the Adjust Menu can be
configured in the following ways:
NONE
No backup heat source is available.
Mod/Con
Boiler
Tank
Sensor
HP Return
Sensor
Water/Water
Heat Pump
Storage
Tank
Expansion
Tank
For Transfer Pump backup, see A406-2, A406-3 and A406-5.
© 2012
406_D - 11/12
32 of 48
To
System
VAR (Variable Speed Pump)
A boiler is the backup heat source. Backup heat is transferred
from the boiler loop to the tank loop with the Variable Speed
Pump. This is only selectable if a boiler water temperature
has been selected and no mixing water temperature has been
selected. Once enabled, the Variable Speed Pump will operate
to maintain the desired tank target.
Note: Boiler return protection is available when selecting
this type of backup. The Variable Speed Pump operates at
minimum speed whenever the boiler supply temperature falls
below the boiler minimum setting or when the control is doing
DHW or Setpoint priority.
EMS2
The Mod dc/mA output uses 0-10 V (dc) to communicate
a desired boiler target water temperature to a Viessmann
modulating boiler. 0 V (dc) corresponds to off, 2.2 V (dc)
corresponds to 81°F (27°C), and 10 V (dc) corresponds to
176°F (80°C).
HP Loop Pump Operation --------------------------------------------Due to different piping arrangements, the HP Loop Pump may
operate in two different ways. Use the HP LOOP setting in the
Adjust Menu to select the proper operation for this pump.
INT (Intermittent)
The HP Loop Pump will operate together with the heat pump
compressor including pre-purge and post-purge times. This
operation is suitable when using a 3-port or 4-port storage tank
to hydraulically isolate the HP Loop from the Tank Loop.
Boiler Variable Speed
Pump
Sensor
Tank System
Pump
Non-Condensing
Boiler
Tank
Sensor
HP Return
Sensor
Storage
Tank
Expansion
Tank
HP Loop
Pump
To
System
3-Port
Storage
Tank
Water/Water
Heat Pump
Water/Water
Heat Pump
To System
Expansion
Tank
3-Port Storage Tank Piping, HP LOOP = INT
For Variable Speed Pump backup, see A406-4
Tank System
Pump
Selecting a Boiler Type ---------------------------------A boiler may be used as a backup heat source to supplement
the heat pump during heating mode. The boiler may also heat
domestic hot water, setpoint loads and space heating zones on
the boiler bus. The House Control 406 has five boiler types to
choose from. Use the BOIL TYPE setting in the Adjust Menu
to select one of the following:
1 STG
The Backup relay is used to operate a single stage on/off boiler
to maintain the boiler target temperature.
0-10
The Mod dc/mA output uses 0-10 V (dc) to operate a modulating
boiler to maintain the boiler target temperature. The Backup
relay is also used to give a boiler enable to allow the modulating
boiler to go through the ignition sequence. The Backup relay
may not be required on all modulating boilers.
4-20
The Mod dc/mA output uses 4-20 mA to operate a modulating
boiler to maintain the boiler target temperature. The Backup
relay is also used to give a boiler enable to allow the modulating
boiler to go through the ignition sequence. The Backup relay
may not be required on all modulating boilers.
EMS1
The Mod dc/mA output uses 0-10 V (dc) to communicate a
desired boiler target water temperature to a tekmar stager that
accepts an EMS signal. 1 V (dc) corresponds to 50°F (10°C)
and 10 V (dc) corresponds to 210°F (99°C).
HP Loop
Pump
4-Port
Storage
Tank
Water/Water
Heat Pump
To System
Expansion
Tank
4-Port Storage Tank Piping, HP LOOP = INT
ON
The HP Loop Pump will operate together with the heat pump
compressor including pre-purge and post-purge times and
it will operate whenever water is being pumped into or away
from the storage tank. This includes:
• When there is a call on the Tank Bus
• When there is a call on the Mix Bus
• When the Transfer Pump is on
This operation is suitable when using a 2-port storage tank
and primary/secondary piping is used to hydraulically isolate
the HP Loop from the Tank Loop.
Tank System
Pump
HP Loop
Pump
2-Port
Storage
Tank
To System
Expansion
Tank
Water/Water
Heat Pump
2-Port Storage Tank Piping, HP LOOP = ON
33 of 48
© 2012
406_D - 11/12
Section C
Heat Cool Operation
Mode --------------------------------------------There are five different modes that the heat pump and backup
can operate in. Use the MODE setting in the Adjust Menu to
select one of the following modes:
AUTO
The heat pump and backup will automatically switchover
between heat and cool mode.
COOL
While in cool mode, the heat pump will satisfy any cooling
calls from the zones on the Tank and Mix bus. The backup
will operate automatically to satisfy DHW and Setpoint calls
for heat on the Boil bus. “Cool” is displayed in the Mode status
field while in cool mode.
the words “PURGING HEAT” or “PURGING COOL” will be
displayed in the view menu depending if the tank is currently
in the heat or cool mode.
Pre-Heat or Pre-Cool
Once the purging has completed, the heat pump is allowed
to preheat or precool the tank. All zones are prevented from
calling for 30 minutes or until the tank temperature reaches
within 10°F (5.5°C) of its new target. This allows time for the
heat pump to switch the tank temperature to its new target
before turning on zones again.
Switchover from
Heat to Cool Mode
Switchover from
Cool to Heat Mode
Status Field
Note: For hydronic cooling with a fancoil, use tekmarNet® 2
thermostat 530 or tekmarNet® 4 thermostat 540 with a date
code of December 2011 or newer.
HEAT
While in heat mode, the heat pump will satisfy any heating
calls from the zones on the Tank and Mix bus. The backup
will operate automatically to satisfy DHW, Setpoint, Tank, Mix
and Boil calls for heat. “Heat” is displayed in the Mode status
field while in heat mode.
Status Field
BKUP (Backup)
While in backup mode, the heat pump is disabled. The backup
will operate automatically to satisfy DHW, Setpoint, Tank, Mix
and Boil calls for heat. “Backup” is displayed in the Mode status
field while in backup mode.
Status Field
OFF
While in off mode, the heat pump and backup are disabled.
Interlock Delay ---------------------------------The interlock delay is the minimum time between heat/cool
switchovers while in the AUTO mode. Use the INTERLOCK
setting in the Adjust Menu to select an interlock time between
10 minutes and 180 minutes.
Switchover -------------------------------------------Switchover is determined by polling the thermostats on the
Tank and Mix bus. When enough thermostats are calling for
the opposite mode and the interlock delay has elapsed, a
switchover will occur. This ensures that the system actually
requires the new tank mode before switching over. Switchover
includes purging and preheat or precool.
Purging
Once Switchover begins, the heat pump is forced off. All zones
that are off remain off and all zones that become satisfied and
turn off also remain off. The remaining zones are allowed to
continue calling for 30 minutes or until the tank temperature
changes by 15°F (8°C). This allows the tank to be purged
before the heat pump is allowed to switch modes and reverse
the water temperature of the tank. While this is happening,
© 2012
406_D - 11/12
34 of 48
Floor Cooling---------------------------------------------------------------------Floor cooling is a form of radiant base load cooling. It reduces
the sensible cooling load, and care must be taken to avoid
removing moisture from the air causing condensation (latent
cooling). It works well in zones with lots of glass and high solar
gains by extracting heat away from the slab before it is able to
heat the room. ‘Floor’ is displayed in the Mode status field while
doing floor cooling.
Status Field
Enable Floor Cooling
For floor cooling to occur, a compatible tekmarNet® thermostat
must have floor cooling turned on. Use the FLOOR COOL (or
F C) setting in the thermostat to turn floor cooling ON.
With Humidity Sensor
In areas where there is a potential for condensation to form
on the cooling surface, floor cooling requires at least one
humidity sensor on the network. The humidity sensor measures
relative humidity. Knowing the relative humidity and the room
temperature, the House Control 406 is able to calculate the
dewpoint temperature. Keeping the surface temperature of
the slab above dewpoint while doing floor cooling will prevent
condensation from forming.
For best results, multiple humidity sensors may be used.
The House Control 406 will choose the zone with the highest
dewpoint to calculate the floor cooling target.
Set the DEW POINT item in the Adjust Menu to ON for floor
cooling with a humidity sensor on the network.
Without Humidity Sensor
Floor cooling may be performed without a humidity sensor.
This operation is only recommended in dry areas where
humidity is not a concern. Set the DEW POINT item in the
Adjust Menu to OFF for floor cooling without a humidity sensor
on the network.
Conditions For Floor Cooling
The House Control 406 will enter into floor cooling when the
following conditions have been met:
1. The 406 is in Warm Weather Shut Down (WWSD)
2. There has been no heat calls for 2 hours
3. There are no cooling or dehumidification calls on the bus that
cause the target to go below the dewpoint temperature
At the thermostat, floor cooling will stop when the room temperature cools to the heating target plus 3°F (1.5°C).
Floor Cooling Target
During floor cooling, the target water temperature is the
higher of:
1. The dewpoint temperature plus 2°F (1°C) if DEW POINT
= ON, or
2. The COOL MIN setting in the Adjust Menu
This ensures the surface of the slab never reaches the dewpoint
temperature causing moisture to condense.
Note: For floor cooling, use tekmarNet® 2 thermostats 527,
528, 529, 530 or tekmarNet® 4 thermostats 537, 538, and 540
with a date code of December 2011 or newer.
Section D
Hydronic Operation
Hydronic Heat & Cool Calls ----------------------------When a thermostat, or other tekmarNet device calls for heating
or cooling, the House Control 406 will register the call on the
corresponding bus and display the call in the “Calls” box of the
status field. Calls for heating or cooling may come from the
tank or mix bus. The boil bus may only call for heating.
®
Status Field
Cool Setpoint ----------------------------------------For a cooling call other than floor cooling, the House Control
406 will operate the bus at an adjustable cooling setpoint.
Use the COOL SETP setting in the Adjust Menu to select a
cooling setpoint.
Outdoor Temperature Reset ----------------------------Once a space heating call is present, the target water temperature for that bus is determined using outdoor temperature
reset together with indoor temperature feedback from the
thermostats. A heating curve is used for each bus to determine
the outdoor temperature reset calculation. The heating curve
operates based on the principle that a buildings heat loss
increases with colder outdoor temperatures. See the default
heating curves for each bus below:
Default Heating Curves
Boil Design
Outdoor Design
The outdoor design is the lowest outdoor temperature on the
typical coldest day of the year. At this outdoor temperature,
the heating curve will calculate the design water temperature
to be the target. Use the OUT DSGN setting in the Adjust
Menu to select an appropriate outdoor design temperature
for your city.
Design Water Temperature
There are up to three design water temperatures to set on
the House Control 406 depending on the water temperatures
configured. These are: boil design, mix design and tank design.
The House Control 406 will target the design water temperature
when the outdoor temperature reaches the outdoor design.
These two parameters set the upper point for each heating
curve. Adjust the BOIL DSGN, MIX DSGN, and TANK DSGN
settings in the Adjust Menu.
Boiler and Tank Minimum --------------------------------------------The BOIL MIN and TANK MIN settings in the Adjust Menu set
the lowest water temperature that the control is allowed to use
as the boiler target and tank target respectively.
It is useful to set a minimum target water temperature when
using a fan coil to prevent blowing cold air into the room.
70°F
70°F
Tank & Mix
Design
10°F
Decreasing Outdoor Temperatures
Warm Weather Shut Down (WWSD)---------------------During warmer weather, heating of the rooms is typically no
longer required. To prevent energy waste from unnecessary
heat pump and backup operation, the control goes into Warm
35 of 48
140°F
70°F
70°F
Outdoor Design
110°F
Increasing Water Temperatures
Heating Curves
with Minimums
Outdoor Design
Increasing Water Temperatures
180°F
Weather Shut Down (WWSD) when the outdoor temperature
rises above the WWSD temperature. Use the WWSD OCC
and WWSD UNOC settings in the Adjust Menu to set an appropriate WWSD temperature.
90°F
Boil Min
Tank Min
10°F
Decreasing Outdoor Temperatures
© 2012
406_D - 11/12
Boiler Minimum Protection -----------------------When operating a non-condensing boiler, it is important to
prevent cool water from returning to the boiler. Cold return
water temperatures create flue gas condensation, which if left
too long, can severely damage the boiler.
If VAR is selected as a backup type, the variable speed pump
will reduce its speed in order to maintain the boiler sensor
above the BOIL MIN setting. The BOIL MIN setting is the
lowest water temperature that the control is allowed to use
as a boiler target.
If the boiler supply water temperature is cooler than the boiler
minimum setting, the control reduces the output of the variable
speed pump. This limits the amount of cool return water to
the boiler and allows the boiler return water temperature to
recover. Once the boiler supply temperature exceeds the
boiler minimum setting, the variable speed pump will return
to normal operation.
Note: The Variable Speed Pump does not provide boiler minimum
protections when the BOIL TYPE is set to EMS1 or EMS2.
Maximum Targets ------------------------------------------------------------The control has a maximum target of + 10°F (+5.5°C) higher
than the DSGN setting for all heating curves. The control will
operate the boiler so that the boiler supply temperature will
never exceed 210°F (99.0°C).
Section E
Heat Pump Operation
Number of Heat Pump Stages ------------------The House Control 406 is capable of operating a single heat
pump, either one or two stage. Use the HP TYPE setting in
the Adjust Menu to select whether a second stage is available
(1STG, 2STG).
Equal Run Time Rotation
If the system has two heat pumps that require equal run time,
set the HP TYPE setting to ROT (Rotate). This way the two
heat pumps will rotate their starting order when one heat pump
accumulates 48 hours more run time than the other.
Heat Pump Source ---------------------------------The House Control 406 only supports heat pump systems
where the load side is hydronic, or water based. The source
side however can either be air source or water source. Use the
HP SOURCE setting in the Adjust Menu to select if the heat
pump is air-to-water (AIR) or water-to-water (GEO).
Staging ------------------------------------------When two heat pumps or a two-stage heat pump is being
used (HP TYPE = 2STG or ROT), the staging method of the
406 changes depending on the HPSOURCE setting: AIR or
GEO.
With an air source heat pump selected, the 406 will stage on
sequentially and off sequentially. This allows the supply water
temperature to be kept close to the target.
GEO Source Staging
Stage 2 ON (Y2)
Stage 1 ON (Y1)
Longer times between cycles
Stage Delay
The House Control 406 stages two heat pumps or a two-stage
heat pump automatically. A manual stage delay can also be
set between 2 and 20 minutes which forces the second stage
to remain off for this adjustable amount of time. Use the HP2
DELAY setting in the Adjust Menu to select either an automatic
or manual stage delay when two heat pump stages have been
configured (HP TYPE = 2STG or ROT).
O/B Switchover ------------------------------------------------------------------Depending on the manufacturer, a heat pump may be designed
to satisfy a dominant heating load or dominant cooling load. A
reversing valve on the heat pump is used to switch between
heating and cooling and is energized with either an O or B
terminal on the heat pump. The House Control 406 has an
O/B output which can operate in the following ways:
• O = Heat pump normally operates in heat mode. Energize
O to operate the heat pump in cool mode
AIR Source Staging
Stage 2 ON (Y2)
R
Y
O
Stage 1 ON (Y1)
With a geo source heat pump selected, the 406 will stage on
sequentially, but turns off both stages at once. This allows
the ground to naturally recover better since there are longer
periods of time between the heat pump transferring heat to
or from the ground source.
© 2012
406_D - 11/12
36 of 48
Rc1 Y1 O/B
406
• B = Heat pump normally operates in cool mode. Energize
B to operate the heat pump in heat mode
R
Y
B
Rc1 Y1 O/B
406
Use the SWITCHOVR setting in the Adjust Menu to select the
proper operation of the O/B terminal.
Backup Delay -----------------------------------------To allow the heat pump to operate at full output for some
adjustable amount of time before the backup heat source is
allowed to come on, a backup delay is used. Use the BKUP
DLY setting in the Adjust Menu to set an appropriate backup
delay time. When OVR is selected, the backup source will
not be called upon for heat unless the MODE is set to BKUP
or the heat pump is locked out on high return temperature or
outdoor temperature. This ensures that the heat pump is being
used to its full potential during heating.
HP Return Water Temperature Limit -------------------At certain return water temperatures, it may not be economical to keep the heat pump operating due to low coefficient of
performance (COP). This will occur in heating when the return
water temperature is too high, and in cooling when the return
water temperature is too low. These values will differ from
one heat pump to another. Use the HP RETURN MAX and HP
RETURN MIN settings in the Adjust Menu to set the heat pump
return water temperature limits for heating and cooling.
Outdoor Air Temperature Limit ----------------------------------Heating - For AIR Source Heat Pumps Only
At low outdoor air temperatures, it may not be economical to
keep an air source heat pump operating during heating due to
low COP. These values will differ from one air source heat pump
to another. Use the BALNCE PT setting in the Adjust Menu to
set the low outdoor air temperature limit for heating.
Cooling
During cool weather, cooling of the rooms is typically no longer
required. The control shuts down the heat pump when the
outdoor temperature falls below an adjustable temperature to
prevent energy waste from unnecessary heat pump operation
during cooling. Use the Y COOLING CWSD setting in the Adjust
Menu to set the low outdoor air temperature limit for cooling.
Note: the CWSD icon is displayed in status field of the display
when the outdoor temperature falls below either the BALNCE
PT or Y COOLING CWSD settings in the Adjust Menu.
Status Field
Heat Pump Differential ----------------------------------------------------The differential operates by closing the Y1 contact when
the tank water temperature is 1/2 of the differential below
the tank target. As the tank temperature reaches 1/2 of
the differential above the tank target, the Y1 contact is
opened, turning the heat pump off.
H.P. Off
+1/2 Differential
Tank Target
H.P. On
- 1/2 Differential
Section F
DHW Operation
DHW Calls ----------------------------------------------A DHW Call is required in order for the control to provide heat
to a DHW tank. Once the control registers a DHW Call, it will
display the DHW icon in the “Calls” box of the status field.
This can be done in one of three ways:
Status Field
DHW Tank Aquastat
If a DHW aquastat (mechanical switch) is used to apply a DHW
Call, the tank is heated to the aquastat temperature setting.
A dry contact is applied across the DHW Call terminals on
the House Control.
• Use the DHW XCHG setting in the Adjust Menu to set the
boiler target required to satisfy this type of DHW call.
DHW Tank Sensor
A DHW tank sensor provides superior temperature control
of the tank compared to an aquastat. The House Control
automatically detects whether a DHW sensor is installed.
37 of 48
The upper limit of the DHW temperature is set by the DHW
OCC setting in the Adjust Menu. The DHW tank differential
is fixed to 6°F (3°C).
• When using a DHW Tank Sensor, the boiler target is set
to the DHW OCC setting plus 40°F (22°C).
tekmarNet ® Setpoint Control with Sensor
A DHW Call is provided through the tekmarNet ® system. This
can be done through the tN4 Boil Expansion terminals with
a tekmarNet ® setpoint device such as a Setpoint Control 161
or 162.
• When using a tekmarNet ® Setpoint Control, the boiler
target is set to the devices Exchange Supply setting.
DHW Mode --------------------------------------------------------------------------The control has five different settings available for DHW Mode
that affect pump operation. The required DHW Mode setting
will depend on the piping arrangement of the DHW tank and
whether or not priority for the DHW tank is necessary. DHW
Priority stops or limits the delivery of heat to the building heating
system while the DHW tank calls for heat. This allows for quick
DHW tank temperature recovery.
© 2012
406_D - 11/12
DHW MODE 1 - DHW in Parallel no Priority
When a DHW Call is present, the DHW Pump is activated.
The Boiler System Pump does not turn on, but may operate
based on either a Boiler, Setpoint or Backup Call.
It is assumed that the DHW Pump will provide adequate flow
through the heat exchanger and the boiler.
DHW MODE 4 - DHW in Primary / Secondary with Priority
When a DHW Call is present, the DHW Pump and the Boiler
System Pump are operated. All boiler temperature zones are
shut off through tekmarNet ® communication to achieve DHW
priority.
DHW Mode = 4
DHW Mode = 1
DHW
Pump
ON
Zone
DHW Pump
Pump ON
ON
Or
OFF
Zone
Pump
OFF
Boiler System
Pump
ON
Boiler
Pump
ON Or OFF
DHW MODE 2 - DHW in Parallel with Priority
When a DHW Call is present, the DHW Pump is activated.
The Boiler System Pump and all boiler temperature zones
are shut off through tekmarNet ® communication to achieve
DHW priority.
It is assumed that the DHW Pump will provide adequate flow
through the heat exchanger and the boiler.
DHW Mode = 2
DHW Zone
Pump Pump
ON OFF
Boiler
Pump
OFF
DHW Mode 5 - DHW Pre-Heat with Priority
DHW Mode 5 may be used in electric only systems where the
heat pump provides heat to a DHW preheat tank. This mode
is only available when the WATERTEMP setting in the Adjust
Menu is set to tank (T).
The DHW sensor is located inside the preheat tank and targets
a 90°F (32°C) tank temperature by default. No other DHW call
is accepted. Use the DHW OCC setting in the Adjust Menu to
adjust the preheat tank target.
The heat pump will target a water temperature 20°F (11°C)
higher than the preheat tank target at the return sensor. The
heat pump target is limited by the HP RETURN MAX setting
in the Adjust Menu.
When a DHW Call is present from the DHW Sensor, the DHW
Pump is activated. The HP Loop Pump is shut off while zones
on the tank bus are allowed to continue to call for heat. This
prioritizes DHW preheat while allowing tank zones to use any
available heat in the storage tank.
It is assumed that the DHW Pump will provide adequate flow
through the preheat tank and the heat pump.
Note: DHW pre-heat will not occur when there is a cooling
call on the Tank bus.
DHW Mode = 5
DHW Preheat
Tank
DHW MODE 3 - DHW in Primary / Secondary no Priority
When a DHW Call is present, the DHW Pump and the Boiler
System Pump are operated. Boiler temperature zones can
turn on if required.
DHW Mode = 3
DHW
Pump
ON
Hot Out
DHW
Sensor
Cold In
DHW
Pump
ON
Zone
Pump
ON
Or
OFF
HP Return
Sensor
Boiler System
Pump
ON
HP Loop
Pump
Electric
Water
Heater
Tank System
Pump
Storage
Tank
OFF
OFF
Expansion
Tank
© 2012
406_D - 11/12
38 of 48
Conditional DHW Priority -------------------------------
DHW Priority Override Time
Increasing Time
If the boiler supply temperature is maintained at or above the
required temperature during DHW generation, this indicates that
the boiler has enough capacity for DHW and possibly heating
as well. As long as the boiler supply temperature is maintained
near the target, DHW and heating occur simultaneously.
DHW Priority Override ---------------------------------To prevent the building from cooling off too much or the
possibility of a potential freeze up during DHW priority, the
control limits the amount of time for DHW priority during cold
weather. During warm weather the DHW priority is 120 minutes.
During cold weather the DHW priority is 15 minutes. Once the
allowed time for priority has elapsed, the control overrides
the DHW priority and resumes space heating for 15 minutes.
It will then revert back to DHW Priority and repeat.
Decreasing Outdoor Air Temperature
DHW Post Purge --------------------------------------------------------------After the DHW Call is removed, the control performs a purge
on the boiler. The control shuts off the boiler and continues
to operate the DHW pump and the Boiler System pump if
applicable. This purges the residual heat from the boiler
into the DHW tank. The control continues this purge for a
maximum of two minutes. The control also stops the purge if
the boiler supply temperature drops below the current boiler
target temperature.
Section G
Boiler Operation
Boiler Target Temperature ----------------------------The boiler target temperature is the temperature which the
control is trying to operate the boiler. There are four items
that determine the boiler target temperature:
• Boil Call
• DHW Call
• Setpoint Call
• Backup Mode
If the control receives more than one of these at the same
time, it will operate the boiler at the highest target.
The control displays the boiler target in the View Menu. If
the control does not presently have a boiler target, ‘– – –’ is
displayed on the LCD.
Boiler Differential --------------------------------------Both on-off and modulating boilers are operated with a differential. In some cases, a modulating boiler must be operated
with a differential while operating at low fire because this
indicates the load is smaller than the minimum modulation of
the boiler. For modulating boilers, the differential no longer
applies once operating the boiler above low fire.
The differential operates by closing the boiler contact when the
boiler supply water temperature is 1/2 of the differential below
the boiler target temperature. As the supply temperature reaches
1/2 of the differential above the boiler target temperature, the
boiler is shut off.
39 of 48
Boiler Off
+1/2 Differential
Boiler Target
- 1/2 Differential
Boiler On
In order to decrease temperature swings and increase boiler
efficiency, the Auto Differential feature automatically adjusts the
operating differential of the boiler based on the heating load.
As the load increases, the differential will decrease to minimize
temperature swings. As the load decreases, the differential
will increase to prevent short cycling. This can significantly
improve operating efficiency and prevent equipment failures
through excessive cycling.
Off
Differential
On
System Load
The 406 is able to operate a single on-off or modulating boiler.
For proper operation of the boiler, the 406 must be the only
control that determines when the boiler is to fire.
*Important note: The operating control in the boiler, also
known as an aquastat, remains in the burner circuit and acts
as a secondary upper limit on the boiler temperature. The boiler
operator temperature setting can be adjusted above 210°F
(99°C), which is the absolute maximum target on the 406.
Time
On-Off Boiler Operation -----------------------------------------------The 406 operates a single hot-water on-off boiler to maintain
the boiler target within a differential. The boiler target is the
average temperature and the boiler supply temperature can
fluctuate by 1/2 of the differential above and below of the
boiler target.
© 2012
406_D - 11/12
Modulating Boiler Operation --------------------
Boiler Motor Speed -----------------------------------------------------------
The 406 can operate a single hot-water modulating boiler
using the Mod dc/mA output and the Backup contact. Not all
boilers require the use of the Backup contact.
The control operates the boiler by first switching the Backup
contact to allow the modulating boiler to go through the ignition
sequence. A 0-10 V (dc) or 4-20 mA analog signal is then used
to modulate the boiler firing rate starting from 50% (5 V (dc)
or 12 mA signal) for 30 seconds.
After the 30 second delay has elapsed, the control will then
allow the boiler to modulate down to the minimum modulation
setting and hold it there for the MOD DELAY time.
After the MOD DELAY has elapsed, the control uses PID
logic to change the boiler firing rate signal in order to satisfy
the boiler target temperature. When the firing rate signal is
reduced down to the MIN MOD setting and the boiler supply
temperature exceeds the boiler target by 1/2 of the differential,
the control will shut off the burner.
The Motor Speed is the amount of time the boiler requires to
go from 0% modulation to 100% modulation.
Gas valve actuating motors have a design time from fully
closed to fully opened which can be found in the manufacturer’s
manual. The Motor Speed should be set to this time.
The Motor Speed setting for a Variable Frequency Drive (VFD)
is the amount of time required to go from a stopped position
to 100% fan speed. Since a VFD has a very quick response
rate, it may be necessary to increase the Motor Speed setting
in order to increase the stability of the boiler modulation.
Use the BOIL MOTR setting in the Adjust Menu to select an
appropriate boiler motor speed.
OR
Essential Settings for House Control 406 with Common Modulating Boilers --------------------------------------------------------------Boiler Control Setting
Wiring Terminals
Required
BOIL MIN
MOD
BOIL
Equipment
Boiler Model
MOTR MOD DELAY
Mod dc/mA
from Boiler Parameter Setting Reference
TYPE
(sec)
(%)
(min)
Backup
Manufacturer
+
10
30
0:10
EM10 Module
None
None
Central
Heating
4-20mA
Modulation
Source
None
Burnham
Alpine
4-20
30
0
0:10
None
Dunkirk
Q95M-200
0-10
10
18
1:45
HAM 010VDC
Module
Heat Transfer
Products Elite
0-10
24
16
0:00
None
60
16
0:00
Munchkin
Interface
Board
Function 16
1
Function 17
1
p.60 Boiler
Manual
30
0
0:50
None
None
None
None
16
20
0:10
None
H3
Active
16
20
0:10
None
Demand
conf
3
50
20
0:00
Interface
Adapter PFA1
Heating
Mode
Mode 5
90
18
2:05
None
Parameter
45
02
60
20
0:30
None
ADD’L HEAT
DEMAND
Type 4
N/A
N/A
N/A
Input Module
0-10V OT
None
None
Heat Transfer
Products
0-10
Munchkin
Laars
4-20
NeoTherm
Lochinvar
0-10
Knight
Lochinvar
0-10
Sync
Peerless
PureFire
0-10
REV2
Triangle Tube
0-10
Prestige Solo
Weil-McLain
0-10
Ultra Series 3
Viessmann
EMS 2
Vitodens 100
p.109 I&O
Manual
406_D - 11/12
40 of 48
2
p.3 Ham
Installation
Instructions
Function 16 0-10 Volt
p.57
Installation
Fan
Function 17
Manual
Speed
Parameter
34 [P .34]
[- - 04]
p.24 Service
Manual
p.19 Service
Manual
p.43 I&O
Manual
p.54 I&M
Manual
p.64 Boiler
Manual
None
For updated information or wiring details, check the service bulletin page on www.tekmarControls.com.
© 2012
1
5
6
2
1
9
10
+
-
+
_
Yellow
0-10
Purple
Buderus
GB142, 162,
312
4
3
33
34
19
20
16
15
17+ 186
5
1
4
Boiler Minimum Modulation --------------------The Minimum Modulation is the lowest signal the control can
send to modulate the boiler. This operates the boiler at low
fire. Use the MIN MOD setting in the Adjust Menu to select
an appropriate boiler minimum modulation.
• Refer to the boiler manufacturer’s literature to determine the
minimum output voltage V (dc) or current (mA) that the boiler
will successfully operate at.
For 0-10 V (dc):
Minimum Modulation =
Boiler’s Minimum Input Signal x 100%
10 V (dc)
Boiler’s Minimum Input Signal - 4mA x 100%
16 mA
Example:
A boiler requires a 1.8 V (dc) signal to fire the boiler at low fire.
The boiler can be modulated to 10 V (dc) where it reaches
high fire.
Minimum Modulation =
1.8 V x 100% = 18%
10 V
10 V (dc)
Boiler
Range
The modulation delay is determined by the boiler manufacturer.
It is the amount of time that the burner must operate before
the internal boiler control allows an external signal to operate
the burner.
Use the MOD DELAY setting in the Adjust Menu to select an
appropriate modulation delay time.
For 4-20 mA:
Minimum Modulation =
Control
Range
Boiler Modulation Delay ---------------------------------
18%
1.8 V (dc)
0 Vdc
Section H
Setpoint Operation
Setpoint Calls ------------------------------------------
Setpoint Operation -----------------------------------------------------------
A Setpoint Call is required in order for the control to provide
heat to a setpoint load, such as a spa, pool, or snowmelt load.
Once the control registers a setpoint Call, it will display the
Setpoint icon in the “Calls” box of the status field. This can be
done in two ways:
The control can operate to satisfy the requirements of a
setpoint call on the boiler loop in addition to a space heating
call, DHW call or Backup call. A setpoint call overrides
the current boiler outdoor reset temperature and WWSD
setting in order to provide heat to the setpoint load.
Status Field
Setpoint
Contact Closure
A dry contact is applied across the Setpoint Call terminals
on the 406.
• Use the SETPOINT setting in the Adjust Menu to set the
boiler target required to satisfy this setpoint call.
tekmarNet ® Setpoint Control with Sensor
A Setpoint Call is provided through the tekmarNet ® system.
This can be done through the tN4 Expansion terminals with a
setpoint device such as a Setpoint Control 161 or 162.
• When using a tekmarNet ® Setpoint Control, the boiler
target is set to the devices Exchange Supply setting.
When the control receives a Setpoint Call:
• The boiler will operate to maintain the Setpoint temperature set in the Adjust Menu, or on the tekmarNet® Setpoint
control.
• The Boiler System Pump does not turn on, but may operate based on either a Boiler, DHW or Backup Call.
It is assumed that the Setpoint pump will provide adequate
flow through the setpoint load and the boiler.
Setpoint calls will also be responded to when the system is
in Away, which can be set using a 479 User Switch.
Setpoint
Setpoint Zone
Pump Pump
ON or
ON
OFF
ON or OFF
Boiler System
Pump
Note: Setpoint operation has no priority.
41 of 48
© 2012
406_D - 11/12
Section I
Mixing Operation
Variable Speed Pump
A standard wet rotor circulator can be connected to the Variable
Speed Pump output on the back of the control. The control
varies the circulator speed to maintain the correct mixed supply
water temperature at the mix supply sensor. For heating, the
hot tank water temperature will be mixed down, and for cooling
the chilled tank water temperature will be mixed up.
For correct sizing and piping of the variable speed pump, refer
to essay E 021.
Note: Pumps manufactured with an internal variable speed
controller are not compatible with the House Control.
The House Control 406 operates the variable speed pump output
for mixing. The Variable % bar graph in the “Zones” box of the
status field indicates the approximate speed of the pump.
Status Field
Var
The table below gives a list of manufacturer approved pump
models for the Variable Speed Pump output.
Manufacturer approved pump models for Variable Speed Pump output.
Grundfos (F)
Taco
B&G
Armstrong
Wilo
15-42 15-58 26-64 43-75 003 007 0010 0012 NRF NRF NRF
Astro
Star S16FX
Star
9
22
33
** *** ** ***
25BU 30 50 * ** *** S21FX 17FX 30F
*Speed 1,**Speed 2, ***Speed 3
These circulators have been tested and approved by the manufacturer for use with tekmar variable speed electronics.
Section J
Pump Operation
The House Control 406 operates six different pump outputs
on the back side of the enclosure. The “Pumps” box in the
status field indicates which pumps are operating at any
given time.
Status Field
Xfr
Pump Exercising --------------------------------------
Boiler System Pump----------------------------------------------------------The boiler system pump operates whenever all the
following conditions are met:
• A Boil Call is present and the thermostat calling for heat has
the Heat 1 pump setting set to On.
• OR a Backup Call is present and BACKUP is set to XFER
or VAR.
• OR a DHW Call is present and DHW MODE is set to 3 or 4.
• There is no DHW or Setpoint priority.
• The control is not in Warm Weather Shut Down.
Tank System Pump -------------------------------------------------------------
DHW Pump --------------------------------------------
The tank system pump operates whenever all the
following conditions are met:
• A Tank Call is present.
• A thermostat is calling for heating or cooling and the Heat
1 Pump setting is set to On.
• The control is not in Warm Weather Shut Down.
Note: The tank system pump does not run when only a Mix
Call is present.
The DHW Pump operation is explained in Section F.
Mix System Pump ---------------------------------------------------------------
Transfer Pump ----------------------------------------
The mix system pump operates whenever all the
following conditions are met:
• A Mix Call is present.
• A thermostat is calling for heating or cooling and the Heat
1 Pump setting is set to On.
• The control is not in Warm Weather Shut Down.
The control operates each pump every three days for 10
seconds to help prevent corrosion and/or precipitate build up
that that would cause the pump to seize. The control ensures
that no heat is supplied to the zones during exercising.
HP Loop Pump -----------------------------------------The HP Loop Pump operation is explained in Section B.
The Transfer Pump operation is explained in Section B.
© 2012
406_D - 11/12
42 of 48
Troubleshooting
It is recommended to complete all wiring to ensure trouble free operation. Should an error occur, simply follow these steps:
1. Find: If the House Control or tekmarNet ® Thermostat flashes
on the screen, it is indicating a problem on the system.
2. Identify: Use the Menu button to locate the Toolbox Menu. The Error code should appear as the first item.
3. Solve: Using the lookup chart below, match the Error code to the one on the control. Use the Description in the chart to
solve the problem.
Error Messages (1 of 3)
Error Message
Description
ADJUST ERROR
The control failed to read the Adjust menu settings, and reloaded the factory default settings. Operation
stops until all the Adjust menu settings are checked.
Note: To clear the error, the access level must be set to Installer and each setting in the Adjust menu
must be checked.
OUTDOOR SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the outdoor sensor. As a result, the control assumes an
outdoor temperature of 32°F (0°C) and continues operation. Locate and repair the problem as described
in the “Test the Sensor Wiring” section.
OUTDOOR SENSOR OPEN CIRCUIT
Due to an open circuit (disconnected or broken wire), the control failed to read the outdoor sensor. As
a result, the control assumes an outdoor temperature of 32°F (0.0°C) and continues operation. Locate
and repair the problem as described in the “Test the Sensor Wiring” section.
MIX SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the Mix supply sensor. As a result, the control operates
the variable speed pump at a fixed output as long as there is a Mix Call. Locate and repair the problem
as described in the “Test the Sensor Wiring” section.
MIX SENSOR OPEN CIRCUIT
Due to an open circuit (disconnected or broken wire), the control failed to read the Mix supply sensor.
The control operates the variable speed pump at a fixed output as long as there is a Mix Call. Locate
and repair the problem as described in the “Test the Sensor Wiring” section.
BOILER SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the boiler sensor. The control no longer controls the
boiler. Instead, the control provides a boiler enable and the boiler operates on its aquastat/limit until the
sensor is repaired. The control will not operate the boiler contact if the Boil Minimum setting is set to Off.
Locate and repair the problem as described in the “Test the Sensor Wiring” section.
BOILER SENSOR OPEN CIRCUIT
Due to an open circuit, the control failed to read the boiler sensor. The control no longer controls the
boiler. Instead, the control provides a boiler enable and the boiler operates on its aquastat/limit until the
sensor is repaired. The control will not operate the boiler contact if the Boil Minimum setting is set to Off.
Locate and repair the problem as described in the “Test the Sensor Wiring” section.
HEAT PUMP RETURN SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the heat pump return sensor. The control still operates
the heat pump, but the HP RETURN MAX and HP RETURN MIN settings are no longer used. Locate
and repair the problem as described in the “Test the Sensor Wiring” section.
43 of 48
© 2012
406_D - 11/12
Error Messages (2 of 3)
Error Message
Description
HEAT PUMP RETURN SENSOR OPEN CIRCUIT
Due to an open circuit (disconnected or broken wire), the control failed to read the heat pump return sensor.
The control still operates the heat pump, but the HP RETURN MAX and HP RETURN MIN settings are
no longer used. Locate and repair the problem as described in the “Test the Sensor Wiring” section.
TANK SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the tank sensor. The control no longer operates the heat
pump or backup. Locate and repair the problem as described in the “Test the Sensor Wiring” section.
TANK SENSOR OPEN CIRCUIT
Due to an open circuit (disconnected or broken wire), the control failed to read the tank sensor. The
control no longer operates the heat pump or backup. Locate and repair the problem as described in the
“Test the Sensor Wiring” section.
DOMESTIC HOT WATER SENSOR SHORT CIRCUIT
Due to a short circuit, the control failed to read the DHW sensor. As a result, the control no longer heats
the DHW tank. Locate and repair the problem as described in the “Test the Sensor Wiring” section.
DHW tank heating will resume once the sensor problem is corrected. The error message self clears
once the error condition is corrected.
DOMESTIC HOT WATER SENSOR OPEN CIRCUIT
Due to an open circuit (disconnected or broken wire), the control failed to read the DHW sensor. As a
result, the control no longer heats the DHW tank. Locate and repair the problem as described in the
“Test the Sensor Wiring” section. DHW tank heating will resume once the sensor problem is corrected.
The error message self clears once the error condition is corrected.
DOMESTIC HOT WATER CALL ERROR
A DHW sensor and a DHW call have been applied at the same time. The DHW tank will not be heated until
the DHW call signal is removed. The error message self clears once the error condition is corrected.
DEW POINT ERROR
The DEW POINT item in the adjust menu is set to ON, but no humidity sensor has been detected on
the network. Either install a humidity sensor on the network, or set the DEW POINT item to OFF. The
error message self clears once the error condition is corrected.
BOILER DEVICE LOST (b:01 TO b:24)
Each tekmarNet® device (thermostat, setpoint control, timer) has an address. The device with this address
on the boiler water temperature is no longer reporting back to the 406.
The device can be located by either the address, or by going to each device in the building, checking
that the LCD is on, and the tekmarNet® communication symbol is on. Trace the wires from the control to
the lost device looking for loose or damaged wires.
Note: If you deliberately remove a tekmarNet® device, hold the Up and Down buttons to clear this error.
MIX DEVICE LOST (1:01 TO 1:24)
Each tekmarNet® device (thermostat, setpoint control, timer) has an address. The device with this address
on the mix water temperature is no longer reporting back to the 406.
The device can be located by either the address, or by going to each device in the building, checking
that the LCD is on, and the tekmarNet® communication symbol is on. Trace the wires from the control to
the lost device looking for loose or damaged wires.
Note: If you deliberately remove a tekmarNet® device, hold the Up and Down buttons to clear this error.
© 2012
406_D - 11/12
44 of 48
Error Messages (3 of 3)
Error Message
Description
TANK DEVICE LOST (T:01 TO T:24)
Each tekmarNet® device (thermostat, setpoint control, timer) has an address. The device with this address
on the tank water temperature is no longer reporting back to the 406.
The device can be located by either the address, or by going to each device in the building, checking
that the LCD is on, and the tekmarNet® communication symbol is on. Trace the wires from the control to
the lost device looking for loose or damaged wires.
Note: If you deliberately remove a tekmarNet® device, hold the Up and Down buttons to clear this error.
MASTER DEVICE ERROR
More than one master has been detected on the tekmarNet®4 expansion terminals. The 406 is a “Master
Device” and no other tekmarNet® reset controls can be added to the tekmarNet®4 expansion terminals.
If one has been added, remove it from the system.
DEVICE ERROR AT ADDRESS B:01 to B:24
Each tekmarNet ® device (thermostat, setpoint control, timer) has an address. One of the devices on the
boiler water temperature has an error. If there is a record of the device address together with the room
name, go to that device to correct the error. Otherwise, go to each device in the building, checking for
the flashing Warning symbol. Once the error on the device is corrected, the error message will clear.
DEVICE ERROR AT ADDRESS M:01 to M:24
Each tekmarNet ® device (thermostat, setpoint control, timer) has an address. One of the devices on the
mix water temperature has an error. If there is a record of the device address together with the room
name, go to that device to correct the error. Otherwise, go to each device in the building, checking for
the flashing Warning symbol. Once the error on the device is corrected, the error message will clear.
DEVICE ERROR AT ADDRESS T:01 to T:24
Each tekmarNet® device (thermostat, setpoint control, timer) has an address. One of the devices on the
tank water temperature has an error. If there is a record of the device address together with the room
name, go to that device to correct the error. Otherwise, go to each device in the building, checking for the
flashing Warning symbol. Once the error on the device is corrected, the error message will clear.
DEVICE ERROR AT ADDRESS T:01 to T:24
Each tekmarNet ® device (thermostat, setpoint control, timer) has an address. One of the devices on the
tank water temperature has an error. If there is a record of the device address together with the room
name, go to that device to correct the error. Otherwise, go to each device in the building, checking for
the flashing Warning symbol. Once the error on the device is corrected, the error message will clear.
45 of 48
© 2012
406_D - 11/12
Frequently Asked Questions
Symptom
LCD display is
off
Look For...
Fuse holder
Power to control
DHW Call on LCD
DHW tank reading
No DHW tank
heating
Boiler symbol on
LCD
DHW pump symbol
on LCD
DHW pump in
operation
Heat pump symbol
on LCD
“MAX” symbol on
LCD
No central
heating
WWSD symbol on
LCD
Tank, Mix or Boil
Calls on LCD
DHW Call on LCD
System in AWAY
MODE setting
“MIN” symbol on
LCD
No central
cooling
Cool outdoor air
temperature
Corrective Action
Control power supply has a 24 V (ac) fuse which if blown, requires replacement.
Use electrical meter to measure 24 V (ac) voltage on input power R and C
terminals.
If a DHW call is present, the control is aware that the DHW tank requires heat.
Ensure the DHW tank temperature is accurate and replace DHW Sensor if
necessary.
If the boiler symbol is on the LCD, there is a problem with the boiler. Ensure the
boiler aquastat manual limit is reset to the on position.
If the DHW pump symbol is on, check to ensure the DHW pump is in operation by
checking for pump vibration or voltage on the pump wiring terminals.
If DHW pump and boiler are operating, the system may require the boiler system pump
to operate to heat the DHW tank. Ensure the DHW Mode setting is set correctly.
If the heat pump symbol is on the LCD, there is a problem with the heat pump. Check
the heat pump for faults or reference the manufacturers` literature.
The heat pump is prevented from operating due to high return water temperature.
Adjust the HP RETURN MAX setting to the heat pump manufacturers’ recommended
maximum return water temperature for heating.
Warm Weather Shut Down (WWSD) is an energy saving feature that prevents central
heating during the summer. Ensure the outdoor temperature reading is accurate and
replace outdoor sensor if necessary. WWSD setting can be increased if heating is
required.
If there are no Tank, Mix or Boil Calls, there are no thermostats calling for heat.
During DHW tank heating, the central heating may not be heated by the boiler.
During AWAY, the thermostats operate at a lower temperature. Locate a ‘User Switch’
and set to Normal to resume heating.
The mode of the 406 can be set to Auto, Cool, Heat, Backup, or Off. For central
heating to occur, ensure the mode is set to either Auto, Heat, or Backup.
The heat pump is prevented from operating due to low return water temperature.
Adjust the HP RETURN MIN setting to the heat pump manufacturers’ recommended
minimum return water temperature for cooling.
The heat pump is prevented from operating due to low outdoor air temperature.
Adjust the Y COOLING CWSD setting to an appropriate outdoor temperature to
stop cooling.
Tank or Mix Calls on
If there are no Tank or Mix Calls, there are no thermostats calling for cooling.
LCD
During AWAY, the thermostats operate at a higher temperature. Locate a ‘User
System in AWAY
Switch’ and set to Normal to resume heating.
The mode of the 406 can be set to Auto, Cool, Heat, Backup, or Off. For central
MODE setting
cooling to occur, ensure the mode is set to either Auto or Cool.
Backup using the variable speed injection pump (VAR) requires the balancing valve
Boiler short
Burner symbol
to be set correctly. Lack of head pressure can lead the injection pump speed to
cycling
cycling on and off
ramp up and down.
Thermostats have a differential of +/- 1.5°F of the temperature setting. Due to the
LCD shows zone on display rounding numbers up, heating can appear on when the temperature is 2°F
above the setting. This is normal operation.
Single zone over
heating
Ensure zone valve terminals measure 0 V (ac). Measuring 0 V (ac) indicates
LCD shows zone off mechanical zone valve may have failed in open position. Measuring 24 V (ac)
indicates control relay may have failed.
Ensure zone valve terminals measure 24 V (ac). Measuring 24 V (ac) indicates
LCD shows zone on mechanical zone valve may have failed in closed position. Measuring 0 V (ac)
Single zone
indicates control relay may have failed.
under heating
LCD shows zone off Check for calls
© 2012
406_D - 11/12
46 of 48
Job Record
Item
Setting
Item
MODE
DEW POINT
WATERTEMP
COOL MIN
ZONES 1-4
SWITCHOVER
HP SOURCE
HP DIFF
HP TYPE
HP2 DELAY
BACKUP
HP LOOP
BOIL TYPE
HP RETURN MAX
OUT DSGN
HP RETURN MIN
TANK DSGN
BALNCE PT
TANK MIN
Y COOLING CWSD
MIX DSGN
Y MIN RUN
BOIL DSGN
Y MIN OFF
BOIL MIN
BKUP DLY
BOIL MOTR
DHW MODE
MIN MOD
DHW XCHG
MOD DELAY
DHW OCC
WWSD OCC
DHW UNOCC
WWSD UNOCC
SETPOINT
INTERLOCK
UNITS
Setting
COOL SETP
47 of 48
© 2012
406_D - 11/12
Technical Data
tN2 House Control 406 Heat Pump & Backup, Four Zone Valves
Literature
Control
Packaged weight
Dimensions
Enclosure
Approvals
Ambient conditions
Power supply
Control Load
Zone, Y1 and O/B Relays
Y2, Backup Relays
Pump Relays
Variable Power
Pump Power
Boil/Mix modulating output
Sensors
- Included
Warranty
406_D, 406_Q, 406_U
Microprocessor control. This is not a safety (limit) control
1.4 lb. (640 g)
5.5” H x 5.5” W x 2.25” D (140 x 140 x 57 mm)
NEMA 1 rated, blue PC+ABS plastic
CSA C US, meets class B: ICES & FCC Part 15
Indoor use only, 32 to 104°F (0 to 40°C), RH 90% Noncondensing
24 V (ac) ±10% 60 Hz, 100 VA max, Class 2
2 VA
24 V (ac) 3.7 A combined
24 V (ac) 5 A
115 V (ac) 5 A 1/6 hp
115 V (ac) 2.4 A
115 V (ac) 12 A
0 - 10 V (dc) 500 Ω min load impedance, 4 - 20 mA 1 kΩ max load impedance
NTC thermistor, 10k @ 77°F (25°C ± 0.2°C) ß=3892
Outdoor Sensor 070 and 4 of Universal Sensors 082
Limited 3 Year
Limited Warranty and Product Return Procedure
Limited Warranty The liability of tekmar under this warranty is limited. The Purchaser, by taking receipt of any tekmar product (“Product”), acknowledges the terms of the Limited Warranty in effect at
the time of such Product sale and acknowledges that it has read
and understands same.
The tekmar Limited Warranty to the Purchaser on the Products sold
hereunder is a manufacturer’s pass-through warranty which the
Purchaser is authorized to pass through to its customers. Under
the Limited Warranty, each tekmar Product is warranted against
defects in workmanship and materials if the Product is installed and
used in compliance with tekmar’s instructions, ordinary wear and
tear excepted. The pass-through 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.
The liability of tekmar under the Limited Warranty shall be limited to, at
tekmar’s sole discretion: the cost of parts and labor provided by tekmar
to repair defects in materials and/or workmanship of the defective product; or to the exchange of the defective product for a warranty replacement product; or to the granting of credit limited to the original cost of the
defective product, and such repair, exchange or credit shall be the sole
remedy available from tekmar, and, without limiting the foregoing in any
way, tekmar is not responsible, in contract, tort or strict product liability, for any other losses, costs, expenses, inconveniences, or damages,
whether direct, indirect, special, secondary, incidental or consequential,
arising from ownership or use of the product, or from defects in workmanship or materials, including any liability for fundamental breach of
contract.
The pass-through Limited Warranty applies only to those defective Products returned to tekmar during the warranty period. This Limited Warranty does not cover the cost of the parts or labor to remove or transport
the defective Product, or to reinstall the repaired or replacement Product,
all such costs and expenses being subject to Purchaser’s agreement and
warranty with its customers.
Any representations or warranties about the Products made by Purchaser
to its customers which are different from or in excess of the tekmar Limited Warranty are the Purchaser’s sole responsibility and obligation. Purchaser shall indemnify and hold tekmar harmless from and against any
and all claims, liabilities and damages of any kind or nature which arise
out of or are related to any such representations or warranties by Purchaser to its customers.
The pass-through Limited Warranty does not apply if the returned Product has been damaged by negligence by persons other than tekmar,
accident, fire, Act of God, abuse or misuse; 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 tekmar’s instructions and/or the local codes
and ordinances; or if due to defective installation of the Product; or if the
Product was not used in compliance with tekmar’s instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, WHICH THE GOVERNING LAW ALLOWS PARTIES TO
CONTRACTUALLY EXCLUDE, INCLUDING, WITHOUT LIMITATION,
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE, DURABILITY OR DESCRIPTION OF THE
PRODUCT, ITS NON-INFRINGEMENT OF ANY RELEVANT PATENTS
OR TRADEMARKS, AND ITS COMPLIANCE WITH OR NON-VIOLATION OF ANY APPLICABLE ENVIRONMENTAL, HEALTH OR SAFETY
LEGISLATION; THE TERM OF ANY OTHER WARRANTY NOT HEREBY
CONTRACTUALLY EXCLUDED IS LIMITED SUCH THAT IT SHALL NOT
EXTEND BEYOND TWENTY-FOUR (24) MONTHS FROM THE PRODUCTION DATE, TO THE EXTENT THAT SUCH LIMITATION IS ALLOWED BY
THE GOVERNING LAW.
Product Warranty Return Procedure All Products that are believed to
have defects in workmanship or materials must be returned, together
with a written description of the defect, to the tekmar Representative
assigned to the territory in which such Product is located. If tekmar
receives an inquiry from someone other than a tekmar Representative,
including an inquiry from Purchaser (if not a tekmar Representative) or
Purchaser’s customers, regarding a potential warranty claim, tekmar’s
sole obligation shall be to provide the address and other contact information regarding the appropriate Representative.
tekmar Control Systems Ltd., A Watts Water Technologies Company. Head Office: 5100 Silver Star Road,
Vernon, B.C. Canada V1B 3K4, 250-545-7749, Fax. 250-545-0650 Web Site: www.tekmarControls.com
Product design, software and literature are Copyright ©2012 by
tekmar Control Systems Ltd., A Watts Water Technologies Company
48 of 48
All specifications are subject to change without notice.
Printed in Canada. 406_D - 11/12.
Download PDF