Viessmann Vitotron 100 Guide rapide

Installation and Service

Instructions

VITOTRON 100

5472 726 - 04 11/2022

For use by heating contractor

Please file in Service Binder

Read and save these instructions

for future reference.

Product may not be exactly as shown

IMPORTANT

Vitotron 100 VLN2

Models 04 to 14.4

Wall-mounted Electric Boiler

Heating input: 13.6 to 49.1 MBH

4.0 to 14.4 kW

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service

Safety Instructions .....................................................3

Electric Boiler Ratings and Specification ...................... 4

Electric Boiler Mounting Clearances ..............................5

Piping Arrangement....................................................6

Sizing the Electric Boiler ..............................................7

Designed Temperature Differential ..............................7

Circulating Pump Information ......................................7

Plumbing Installation Guidelines ...................................8

Electrical Installation.................................................10

Control Panel ...........................................................12

Heating Mode / Initial Start-Up ...................................13

Winter Mode (Heating Mode) .......................................13

Summer Mode (Stand-by Mode)....................................16

Advanced Settings ...................................................17

Troubleshooting .......................................................18

Care and Maintenance ..............................................18

General View of the Electric Boiler..............................19

Parts List.................................................................20

Electric Boiler Parts...................................................21

Instructions for the Installer

Instructions for the User

Page

Table of Contents

This appliance is not intended for use by persons

(including children) with reduced physical, sensory or

mental capabilities or lack of experience and knowledge,

unless they have been given supervision or instruction

concerning use of the appliance by a person responsible

for their safety. Children should be supervised to ensure

that they do not play with the electric boiler appliance.

Consider all piping and electrical connections before

selecting electric boiler location.

Failure to follow the instructions in this manual could

result in severe personal injury, death or property damage.

IMPORTANT

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service Instructions for the Installer

Safety Instructions

8. This electric boiler is equipped with a 194°F manual

reset safety high limit device. The reset button is

clearly located in the center of this device.

9. This electric boiler will not operate below a 7 psi

water pressure level.

10. This electric boiler is equipped with a Wilo circulator

pump. After thermostat temperature set point has

been reached the pump will continue to

circulate water for 3 additional minutes as part of a

post purge sequence to push heated water away from

heat exchanger.

11. This electric boiler is equipped with a differential

pressure relief bypass valve. It allows the system

to keep minimal flow of heating water through

the electric boiler and reduce noise in the installation

when equipped with thermostatic zone valves.

12. Do not drain the water from the electric boiler after

the heating season.

13. In summer do not shut off the power supply (120VAC

and 240VAC) and leave the controller in stand-by

(summer mode) between the heating seasons. The

electric boiler is equipped with an exercise timer

control feature that allows the circulating pump to

operate 15 minutes each day and will ensure longer

operation the circulating pump and will help to

eliminate the buildup of debris. (See section “Summer

mode (stand-by mode)”on page 11).

14. The electric boiler is pre-set by the manufacturer to

work with hydronic radiant floor, radiant ceiling,

hot water baseboard and water to air heat

applications. Temperature adjustments can be made

on the control panel to meet these applications

requiring desired water temperatures between 85° -

140°F.

1. Read and strictly follow the installation and operating

instructions to ensure a longevity and reliable electric

boiler operation.

2. This manual provides general installation guidelines.

Your installation must comply with ALL applicable

local codes.

3. 1Always have a qualified electrician perform

electrical wiring. Manufacturer will not be held

responsible for faulty installations which are performed

by unqualified electricians. An efficient electrical

installation which has been completed in accordance

with the binding norms of electric installation.

Electric installation should be equipped with electric

circuit breakers and other solutions which will ensure

disconnecting the electric boiler from the source of

power.

4. All installation work must be performed when the

power and water supply is disconnected from the

main electrical panel.

5. This electric boiler must be installed vertically and on

an even wall surface with access to plumbing

connections on bottom.

6. Any associated components (i.e. electric boiler,

water tubing, valves, manifolds etc...) must be

flushed before electric boiler installation.

7. This electric boiler is equipped with a safety relief

valve. Do not install any barrier fitting or valve on the

outlet of the safety valve. Connect and extend

cin. copper piping from relief valve and terminate

at least 6 in. from the floor or floor drain.

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service

Instructions for the Installer

Electric Boiler Ratings and Specifications

Electric Boiler Model VLN2 04 VLN2 06 VLN2 08 VLN2 12 VLN2 14.4

Electric Boiler

Rated Power

kW 4 6 8 12 14.4

Btu/h 13,652 20,478 27,304 40,956 49,147

Voltage V 240

Rated Current A 16.66 25.0 33.3 50.0 60.0

Breaker Quantity-

Amps

A 1 @

30 amp

1 @

40 amp

1 @

50 amp

1 @

60/70 amp

1 @

80 amp

Heating Elements Quantity 3

Element Resistance

/ each

Ω43.3 28.8 21.6 14.4 12.0

Circulating Pump - Wilo Star S 21 U 15. 3 speed

Circulating Pump

Voltage

V 120V, 60Hz

Circulating Pump

Amps

A .97

Speeds 3

Fuse Rating 2.0 amp

Operating

Temperature Range

°F 85° - 140°

Inlet / Outlet

Pipe Thread

G cin. (Internal Thread)

Expansion Vessel

(14 psi)

Gallon 1.6

Safety Relief Valve

Rating

psi 30

Maximum Pressure psi 30

Minimum Pressure psi 7

Weight Lbs. 68.5

Dimensions

L x W x D

Inches 28 x 17 x 97/8

Minimum Flow Rate gpm 1.1 1.32

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service Instructions for the Installer

Electric Boiler Mounting Clearances

After reading instructions, please keep this manual with

the electric boiler for future reference. Affix the plastic

holder to the outside of the electric boiler and insert

manual in this pocket.

IMPORTANT

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service

Piping Arrangement

Instructions for the Installer

Typical radiant floor heating application

1Electric Boiler

2Additional expansion tank - if needed

Electric boiler piped in a primary/secondary (P/S)

configuration. Consider P/S when higher flow rates are

necessary and when the electric boiler meets the intended

heatloss of the hydronic system.

1Electric Boiler

2Additional expansion tank - if needed

3Low loss header

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service

Sizing of the Boiler

Instructions for the Installer

It is very important to conduct a heatloss analysis of

the intended heated space. Select the electric boiler size

in kW based on its Btu/hr. rating that best meets the

designed heatloss.

It is important not to overly exceed the kW sizing as

this will lead to unnecessary costs of electric boiler, wiring

and materials. Consequentially it is extremely imperative

NOT to undersize the electric boiler.

How to choose the correct electric boiler size? Convert

BTU to kW by dividing the BTU load by 3,413.

(Ex. 33,513 BTU / 3,413 = 9.81kW). Choose a electric

boiler that slightly exceeds this kW requirement by no

more than 20%.

For larger BTU loads consider cascading the electric

boilers together and pipe the system in a parallel

configuration as described in the piping arrangement

section.

Note: that utilizing propylene glycol freeze protection will

reduce the heat transfer and cause the system to

be less efficient. Under no circumstance should

more than a 50/50 ratio of water to propylene

glycol be used. Consult with radiant system

designers for required freeze protection guidelines.

Designed Temperature Differential

Radiant floor heating systems are typically designed for a

10°- 20°F temperature differential determined by when

the heating fluid leaves the electric boiler and where it

enters the radiant heat source. i.e. radiant PEX/tubing.

Circulating Pump Information

This electric boiler is equipped with a Wilo Star S 21 U

15, 3 speed circulating pump. To determine the speed or

setting of the pump, confirm with radiant design completed

by others and or complete a pressure-loss calculation.

Refer to calculations of loop lengths to determine proper

speed. The pump will automatically operate based on a

thermostat call for heat. After the thermostat temperature

set point has been reached, the pump will continue to

circulate water for 3 additional minutes as part of a post

purge operation to push heated water away from the heat

exchanger.

This electric boiler is also equipped with an additional

pump relay. This will aid the installer if there is any need

to pipe the systems with a secondary circulating pump to

overcome pressure drop due to piping or hydronic tubing

design. This is commonly referred to as primary/secondary

applications described in the piping arrangement section.

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service

Plumbing Installation Guidelines

Instructions for the Installer

1. Remove outer screws at the bottom and at the top

of electric boiler and carefully open the front cover.

2. The electric boiler is wall hung and must be installed

in a vertical position where plumbing connections are

located at the bottom. Utilize key holes slots to hang

the electric boiler. Refer to diagram on clearances

(page 5).

3. The electric boiler is provided with a e in. air vent

located on top of the heat exchanger. It is designed to

collect and remove air. Ensure plastic drain tubing

remains in place and exits the electric boiler in the

lower right corner.

4. The electric boiler is equipped with a pre-charged flat

expansion tank located on the back housing of the

electric boiler. Expansion tank has a Shrader valve,

which location is shown on the figure. This figure

presents the bottom view of the electric boiler.

Access to the valve is only from the bottom of

the electric boiler. From there it can be connected any

pressure gauge to check the pressure or pump to refill

the air inside the tank.

5. The electric boiler is equipped with an ASME

approved 30 psi automatic safety pressure relief

valve. Install the necessary length of cin. copper

piping from the relief valve to within 6 in. of the floor

to prevent personal injury or water damage to

surrounding area.

6. Observe inlet return piping (blue label) and outlet

supply feed piping (red lable) connections. Install

shutoff valves below inlet and outlet connections

before plumbing the electric boiler to the hydronic

heating system.

DO NOT reverse these connections to the radiant

supply and return manifolds. Optional temperature

or pressure gauges can be installed below the electric

boiler if desired.

7. Install boiler drain valve(s) as necessary to aid in

filling, purging and draining of unit and the related

system components.

8. Water supply feed or pressure reducing valve can

be installed to comply with local building codes.

Local codes may require a back flow preventer called

a check valve when installing a fixed domestic water

supply line to the electric boiler.

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service

Plumbing Installation Guidelines (continued)

Instructions for the Installer

9. When possible, fill the electric boiler and hydronic

system with treated water. (i.e. soft or distilled

water) This will substantially extend the life of the

heating elements and reduce sediment buildup.

10. Freeze protection additives can be added. Only use

propylene glycol type freeze protection products for

hydronic heating systems that are non-toxic and

corrosion resistant.

The propylene glycol mix shall not exceed 50%, by

volume. 1 Under no circumstance should methanol

or ethylene glycol (automobile antifreeze) be added

to the electric boiler system as this may damage

internal components.

11. Insure purging of all air throughout electric boiler

system and related components.

12. This electric boiler requires a minimum

pressure of 7 psi in order to operate. Pressure levels

for hydronic systems typically are above the pre-

charged expansion tank pressure level (12 psi).

If additional pressure gauges are installed verify

reading as described on item 7.

13. The electric boiler is equipped with a pressure

differential bypass valve. This allows the minimum

flow rate to pass through the electric boiler when all

zone valves are closed. The valve will also help

reduce noise issues upon closing of zone valves or

actuators.

To adjust:

Turn differential bypass valve clockwise until it stops.

Turn on all heating zones and let them heat for a

couple of minutes.

Caution! piping can get hot quickly upon opening

the valve. Slowly open the bypass valve by turning

in a counter clock wise direction.

Stop turning once an increase in temperature is felt

on the outlet side of the valve. This is referred to the

tipping point. After reaching the tipping point continue

to turn the valve one complete turn. The valve is now

set to bypass excess flow as zone valves close.

Set the thermostats to normal set temperatures.

14. Proceed to the Electrical Installation.

5472 726 - 04

Vitotron 100 Electric Boiler Installation/Service

Electrical Installation

Instructions for the Installer

For supply connections, use 10 awg or larger wires

suitable for at least 167°F (75°C)

1. All electrical work should be completed in accordance

to local or state electrical and building codes.

2. This electric boiler must be electrically grounded in

accordance with National Electrical Code ANSI/

NFPA70, or local codes.

3. This electric boiler operates with 240VAC single

phase electrical power source.

4. Connect the electric boiler to the electrical service

using 1COPPER WIRE ONLY. Tighten connections

by using a 3/16 in. Hex key tool. Conform to local

electrical codes for correct sizing of electrical breakers

and size of electric conductor wires. Refer to electric

boiler nameplate for current and kW ratings. Local

electric codes may require an electrical disconnect.

Electrical Wiring Diagram

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