tekmar 401 Installation

Installation & Operation Manual

tekmarNet® 2 House Control 401

Introduction

The House Control 401 is designed to operate as part of a complete hydronic heating system with tekmarNet®2 (tN2) thermostats. It can provide operation of a single outdoor reset water temperature, Domestic Hot Water and Setpoint capabilities. It is easy to add more zones, add schedules or other convenient accessories through the use of the tekmarNet®4 (tN4) Expansion terminals.

D 401

07/11

HVAC Systems

Features

•

Single on-off, two-stage or modulating boiler

•

Boiler outdoor reset temperature

•

Domestic Hot Water tank operation

•

Setpoint operation

•

For use with tekmarNet Four 115 V (ac) powered zone pump outputs

• Expand to 24 zones using tekmarNet®4 expansion

• ports

CSA C US Certified for use in USA and Canada

•

2 Thermostats

Replaces: 09/10

VIEW

Calls

Boil

Pumps

Zones 1 2 3 4

Item

House Control 401

Beneﬁ ts

Energy efficiency through Outdoor Temperature

• Reset with Indoor Feedback

Indoor 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

•

Table of Contents

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Installation ...................................................................... 2

Preparation ................................................................ 2

Physical Dimensions ................................................. 3

Installation Location .................................................. 3

Rough-In Wiring ........................................................ 3

Sizing the Transformer .............................................. 4

Control Wiring ........................................................... 4

Sensor Wiring ............................................................ 6

Testing the Sensor Wiring ......................................... 8

Testing the Control Wiring ......................................... 8

Max Heat ................................................................... 9

Applic ations .................................................................. 10

User Interface ............................................................... 12

Display......................................................................12

Symbols ...................................................................12

Navigating The Display ............................................13

Access Levels and Thermostat Lock ........................13

Programming and Settings .......................................13

View Menu ...............................................................14

Adjust Menu ........................................................15-16

Monitor Menu ...........................................................17

Toolbox Menu ...........................................................18

Sequence of Operation ................................................19

tekmarNet

Boiler Temperature Reset Operation ........................19

Domestic Hot Water Tank Operation ....................... 20

Setpoint Operation .................................................. 22

Boiler Operation ...................................................... 22

Pump Operation .......................................................24

Energy Saving Features ...........................................24

Troubleshooting ............................................................25

Error Messages .................................................. 25-26

Frequently Asked Questions .............................. 26-27

Job Record ...............................................................27

Technical Data ..............................................................28

Limited Warranty and Product Return Procedure ........28

System ..................................................19

Getting Started

Congratulations on the purchase of your new tekmarNet 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.

House Control!

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

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

Preparation

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.

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.

Tools Required

tekmar or jeweller screwdriver

• Phillips head screwdriver

•

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Needle-nose Pliers

• Wire Stripper

•

Materials Required

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(2) #10 x 1” Wood Screws

• (3) Wire Nuts

• 18 AWG LVT Solid Wire (Low Voltage Connections)

•

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14 AWG Solid Wire (Line Voltage Connections)

• tekmar 009K (24 V (ac) transformer with 4” x 4” junction box)

• Cable or Conduit Connectors

•

Power Required

115 V (ac), 1-phase, 15 A service from circuit breaker

• Power disconnect (optional)•

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panel

Physical Dimensions

Front View Side View Back View

tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2

Made in Canada

Zone 1

Zone 2 Zone 3 Zone 4

5–1/2”

(140 mm)

7/8”

(22 mm)

Sensors - No Power

ComBoil Out DHWCom

Setpoint DHW

Call Call

H8006B

1–1/8” (30 mm)

Item

House Control 401

5–1/2”

(140 mm)

Input Power

tN4 C

Mod dc/mA Boil Exp.

Stage 2Stage 1

Use at least 167°F (75°C) conductors

2–1/4”

(57 mm)

4–1/2” (114 mm)

1/2” Knock-out (x 4)

Contro l designed to mo unt on 4” x 4” electr ical box (not included). Electrical box shown comes with tekm ar 009K

1/2” x 5/8”

(12 mm x 16 mm)

Knock-out (x 4)

Ø 1/8” (3 mm)

wires are not removable.

Strip wires 1/2 inch

(13 mm). Installed

12-18 AWG

401

DHW Pump

Zone 4

Pump Power

Zone 3

Zone 2

Zone 1

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.

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.

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Locate the control near the pumps 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.

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

• DHW Tank Pump (if applicable)

• Four Zone Pumps

•

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Low Voltage Wiring

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(L,N)

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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 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.

Pull two conductor 18 AWG LVT cable, up to 500 feet (150 m) for the following equipment:

tekmarNet®2 Thermostats

• Boiler Stage 1 T-T

•

Sizing the Transformer

Boiler Stage 2 T-T (if applicable)

• Modulating Boiler 0-10 V (dc) or 4-20 mA (if applicable)

• Outdoor Temperature Sensor

• Boiler Supply Temperature Sensor

• DHW Tank Temperature Sensor (if applicable)

• DHW Tank Aquastat (if applicable)

• Setpoint Device (if applicable)

•

Pull three conductor 18 AWG LVT cable for the following equipment:

tekmarNet®4 Accessories (User Switch, Timer)

•

The control requires an external transformer with 20 VA capacity or greater. A tekmar Transformer 009 (or 009K

VA, and includes an in-line fuse to protect the transformer and control.

which includes a 4” x 4” electrical box) can supply up to 40

Control Wiring

Line Voltage Wiring CAUTION: TURN ALL POWER OFF BEFORE PERFORMING ANY WIRING.

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

Connect the Neutral (N) wires from each pump and wire

• to 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.

Figure 1 - Connect Ground Wires

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Wire the Pump Power (L)

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 3.

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 4.

DHW

Figure 2 - Connect Neutral Wires

Zone 4

DHW

Zone 3

Power

Zone 1

Zone 2

Source

(L,N)

Figure 3 - Connect Line Voltage (Hot)

401

Zone 4

DHW

Zone 4

Zone 3

Power

Zone 2

Zone 1

Source

(L,N)

DHW Pump

Strip wires 1/2 inch (13 mm). Installed wi

es are no

12-1

Pump Power

ovable.

Zone 3

Zone 2

Zone 1

Zone 4

Zone 3

Figure 4 - Connect Pump Line (Hot)

DHW

Zone 4

Zone 3

Zone 2

Zone 1

Pump

Leads

Power

Source

Zone 2

Zone 1

401

Zone 4

DHW Pump

Strip wires 1/2 inch (13 mm). Installed wires are not removable. 12-18 AWG

Power

Source

Pump Power

Zone 3

Zone 2

Zone 1

Rear Line Voltage Wiring Diagram

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401

Zone 4

DHW Pump

Pump Power

Strip wires 1/2 inch (13 mm). Installed wires are not removable. 12-18 AWG

Install The Enclosure

Ensure that the pump wires are neatly tucked inside

•

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the electrical box. Using 2 of the 4 holes in the back of the enclosure, se-

• curely fasten it to the electrica junction box with 2 #10 screws as shown in Figure 5.

Zone 3

Zone 2

Zone 1

(black) (black)

(black)

(red)

to pump grounds

Figure 5

DHW

Zone 4

Zone 3

Zone 2

Zone 1

NGL

115 V (ac)

Low Voltage Wiring

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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 401.

tN2 Thermostats

The 401 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 401.

tN4 Boiler Expansion Terminals

The 401 uses the Expansion tN4 and C terminals to communicate with additional thermostats, setpoint controls, wiring centers, and other tekmarNet® devices.

Connect the tN4 and C Boil Exp. terminals on the 401

• to the corresponding tN4 and C Expansion terminals of the additional external device.

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 OR apply 24

• V (ac) to the DHW call terminals.

To create a Setpoint call, wire a dry contact OR apply

• 24 V (ac) to the Setpoint call terminals.

Wiring the Boiler

The 401 can operate a single modulating boiler, single on-off, or a single two-stage on-off boiler.

On/Off Boiler

Connect the Boiler Stage 1 terminals on the 401 to the

• T-T (or R-W) terminals on the boiler.

If required, connect the Boiler Stage 2 terminals on the

• 401 to the second stage T-T (or R-W) terminals on the boiler.

Modulating Boiler

Wire the Mod (dc/mA) positive (+) and negative (-) ter-

• minals on the 401 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 Boiler Stage 1 terminals on the 401 to the T-T (or R-W) terminals on the boiler.

Front Low Voltage Wiring Diagram

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R C

L N

Expansion

tN4 Boil

CtN4

Modulating

Boiler

—+

2 1

Back of

House Control 401

Item

ComBoil Out DHWCom

Zone 1

H8006B

Zone 2 Zone 3 Zone 4

tN2 tN2 tN2 tN2 tN2 tN2 tN2 tN2

Sensors - No Power

Call Call

tN4 C

Mod dc/mA Boil Exp.

Setpoint DHW

Input Power

Made in Canada

Use at least 167°F (75°C) conductors

Stage 2Stage 1

------------------------------------------------------------------------

tekmarNet

Outdoor

Sensor

070

Boiler Supply

Sensor 082

DHW Tank

Sensor 082

Setpoint Call

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2 Thermostats

tekmarNet

4 Expansion to

Wiring Centers, Timers, or

User Switch

One or Two Stage

Boiler T-T

DHW Call

from DHW

Tank Aquastat

(optional)

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

• enclosure.

The sensor can either be mounted directly onto a

• wall or a 2” x 4” electrical box. When the senor is wall mounted, the wiring should enter through the back or bottom of the enclosure. Do not mount the sensor with the conduit knockout facing upwards as rain could enter the enclosure and damage the sensor.

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24 V (ac) Transformer 009

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 sensor should not be exposed to heat sources such as ventilation or window openings.

The sensor should be installed at an elevation above

• the ground that will prevent accidental damage or tampering.

Sensor with rear entry wiring

Sensor with bottom entry wiring

Sensor mounted onto 2" x 4" electrical box

Wiring the Outdoor Sensor

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Connect 18 AWG or similar wire to the two terminals

•

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provided in the enclosure and run the wires from the 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

Mounting the Universal Sensor

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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.

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.

Retaining Clip

Universal Sensor

Sensor Well

Bottom of Enclosure 080

Cable Tie

Testing the Sensor Wiring

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-----------------------

--------------------------------------

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

estimate 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.

control while the test is performed. Using the chart below,

TemperatureResistanceTemperatureResistanceTemperatureResistanceTemperatureResistance

°F °C

-50 -46 490,813 20 -7 46,218 90 32 7,334 160 71 1,689

-45 -43 405,710 25 -4 39,913 95 35 6,532 165 74 1,538

-40 -40 336,606 30 -1 34,558 100 38 5,828 170 77 1,401

-35 -37 280,279 35 2 29,996 105 41 5,210 175 79 1,281

-30 -34 234,196 40 4 26,099 110 43 4,665 180 82 1,172

-25 -32 196,358 45 7 22,763 115 46 4,184 185 85 1,073

-20 -29 165,180 50 10 19,900 120 49 3,760 190 88 983

-15 -26 139,401 55 13 17,436 125 52 3,383 195 91 903

-10 -23 118,018 60 16 15,311 130 54 3,050 200 93 829

-5 -21 100,221 65 18 13,474 135 57 2,754 205 96 763 0 -18 85,362 70 21 11,883 140 60 2,490 210 99 703 5-15 72,918 7524 10,501 14563 2,255 215102 648

10 -12 62,465 80 27 9,299 150 66 2,045 220 104 598 15 -9 53,658 85 29 8,250 155 68 1,857 225 107 553

°F °C °F °C °F °C

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 Step 2 Step 3 Step 4 Step 5 Step 6

Zone 1 turns on for 10 seconds. Zone 2 turns on for 10 seconds. Zone 3 turns on for 10 seconds. Zone 4 turns on for 10 seconds. The DHW pump turns on for 10 seconds. During the boiler test step, zone relays 1 through

4 turn on.

If the Boil Type is 1 Stage, the boiler stage 1 relay is

----------------------

-----------------------

-------------

----------

--------------------------

----------------------

• closed for 10 seconds and then opened.

If the Boil Type is 2 Stage, the boiler stage 1 relay is

• closed for 10 seconds, then the boiler stage 2 relay is closed for 10 seconds and then both relays are opened.

If Boiler Type is modulating 0 - 10, the boiler stage

• 1 relay is closed for 10 seconds and the modulating output operates at 50 % [5 V (dc)].

If Boiler Type is modulating 4 - 20, the boiler stage

• 1 relay is closed for 10 seconds and the modulating output operates at 50 % (12 mA).

Step 7

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 1 pump and terminals. The voltage should measure between 103.5 V (ac) and 126.5 V (ac). Repeat for Zones 2, 3, and 4.

Testing the DHW Pump

Activate the User Test sequence and pause at Step 5 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).

Control returns to normal operation.

----------------------

-----------------------

Testing the Boiler Stage 2 Contact

This test applies for 2 stage on-off boilers only. Activate the User Test sequence and pause at Step 6 by pressing the Item button once the boiler stage 2 turns on. Using an electrical meter, measure for continuity over the boiler stage 2 terminals.

Testing the Boiler Modulating Output

This test applies for modulating boilers only. Active the User Test sequence and pause at Step 6 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.

--------------------------

----------------------

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----------

Testing the Boiler Stage 1 Contact

Activate the User Test sequence and pause at Step 6 by pressing the Item button once the boiler stage 1 turns on. Using an electrical meter, measure for continuity over the boiler stage 1 terminals.

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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 boiler will

• run to maintain a target of Boil Design + 10°F (+ 6°C). (One can purge the system using this test and leave the boiler un-powered. This will prevent heat from entering the system during the purge.)

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 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’.

+ 19 hidden pages

tekmar 401 Installation

Specifications and Main Features

Frequently Asked Questions

User Manual