Euroheat Harmony 15, Harmony 25, Stanford 25, Harmony 35, Harmony 45 Technical Manual

1

Balanced Flue Stove

Technical Guide

Document No: IN1105

2

Hearth and Fireplace Requirements

Do not be tempted to ﬁt the stove into an unsuitable ﬁreplace. Beyond the requirements of the building regulations and access to facilitate servicing the stove, providing a setting which will complement the stove is not a luxury, it is the practicality of making the most of an investment. A good builder will be able to transform even the most utilitarian of ﬁreplaces, whether altering its proportions to those of the “Golden Mean” ideal, exposing a wooden lintel, stone or simply removing superﬂuous detailing for comparatively small costs, and the result will be a pleasure for many years.

Minimum clearance

from combustible

materials

Minimum clearance

from non

combustible

materials

A 12" 300mm** 9" 230mm

B 6" 150mm** 4" 100mm

C 1" 25mm** N/A

D 2" 50mm** 2" 50mm

E 6" 150mm** 4" 100mm

F

12mm of non

combustable material.

12mm of non

combustable material.

Curtains and furnishings should be a minimum of 1m from the stove.

The stove can be placed on a combustible ﬂoor providing it can support the weight, and providing a non combustible hearth plinth with a minimum thickness of 12mm is utilized.

** The measurements provided are for guidance only.

In all installations any surrounding ﬂammable materials must not be allowed to exceed 80°C or a non combustible shield provided in accordance with current regulations. The stove must always stand perfectly level and have sufﬁcient space allowing for service work.

A

B

D

C

E

F

1/3 2/3

“Golden Mean”

Side Prole

1

2/3

“Golden Mean”

Front View

3

Balanced Flue Systems

A balanced ﬂue system utilizes a double concentric pipe, the inner one taking away the products of combustion and the outer one bringing the air supply to the stove. This system allows a gas stove to be installed where no ﬂue exists, and because the ﬂue needs very little vertical height to operate, it is often possible to route the ﬂue through the room wall to the outside. With all the air necessary for combustion being supplied through the outer pipe directly from the outside, the room in which the stove is installed needs no ventilation speciﬁcally for the stove. The balanced ﬂue system has been designed to give a huge range of installation options, terminating either horizontally or vertically, as illustrated in the diagram below.

Deciding on which form the balanced ﬂue should take will very much be constrained by the termination of the ﬂue. Building Regulations lay out deﬁnitive guide lines for where a ﬂue can terminate, see the diagram later in this document, and if the building is listed there may be constraints on the position of any terminal and advice should be sort from the appropriate regulatory authority.

4

No Chimney ----- No Problem

This document will help you design and your qualiﬁed engineer install a suitable balanced ﬂue system for your stove. Following the simple guide lines will allow a balanced ﬂued stove to be ﬁtted in most situations where a conventionally ﬂued stove could not be ﬁtted.

Top to Vertical High Level Flue Kit

The vertical balanced ﬂue system is ideal in situations such as in a newly constructed conservatory where there are no walls through which to pass a horizontal ﬂue. The ﬂue will rise from the stove vertically passing through the roof where it will then terminate with a vertical terminal. Minimum height 2m maximum 30m.

Top to Horizontal High Level Flue Kit

It is not necessary for the stove to be situated against the outside wall through which the ﬂue will pass, as the versatility of the balanced ﬂue system can allow for considerable lengths of horizontal run of the ﬂue.

Rear to Horizontal Low Level

The low level horizontal kit is probably the simplest method of installation and allows you to ﬁt the stove against any suitable outside wall in any room in your property. Maximum horizontal length 440mm, minimum length 310mm.

Existing Chimney Adapter Kit

The ﬂue kits are also designed to be able to utilize an existing chimney. Properties which are designed with a high thermal efﬁciency may not allow an air brick to be ﬁtted to supply air to a stove over 7kW input, the balanced ﬂue stove overcomes this requirement as it is a sealed appliance. In some cases the top section of a chimney may have been removed and the versatility of the balanced ﬂue system allows you to use what remains of the chimney using the chimney adapter kit.

5

Location of Outlets from Flues Serving Gas Balanced Flue Stoves.

)

Minimum Separation Distances for Terminals in mm

Location Balanced Flue

A Below an opening Appliance

rated heat

input

0-7kw

>7-14kw

> 14-32kw

>32

300

600 1500 2000

B Above an opening (1) 0-32kw

>32kw

300

600

C Horizontally to an opening (1) 0-7kw

>7-14kw

>14kw

300

400

600

D Below gutters, soil pipes or drain

pipes

300

E Below eaves

300

F Below balcony or car port roof

600

G From a vertical drain pipe or soil

pipe

300

Minimum Separation Distances for Terminals in mm

Location Balanced Flue

H From an internal or external corner

or to a boundry alongside the

terminal

600

I Above ground,roof or balcony level 300 J From a surface or a boundary facing the

terminal

600

K From a terminal facing the terminal 600

L From an opening in the car port into the

building

1200

M Vertically from a terminal on the same

wall

1200

N Horizontally from a terminal on the

same wall

300

P From a structure on the roof

1500

Q Above the highest point of

intersection with the roof

600

R Flue should not penetrate shaded area 600 S Flue should not penetrate shaded area

200

Note (1)

An opening means an openable element, such as an openable window, or a ﬁxed opening such as an air vent. However, in addition, the outlet should not be nearer than 300mm to an opening into the building fabric formed for the purpose of accommodating a built in element, such as a window frame.

Calculating Flue Aspect Ratios

The stove operates correctly only with air ﬂow induced by the ﬂue system being within the deﬁned parameters. To achieve these, the vertical elements of the ﬂue, which induce ﬂue draught and increase the air supply to the stove, must be balanced against the horizontal elements of the ﬂue, which offer resistance to ﬂue draught and reduce the air supply to the stove. The ratio of vertical to horizontal lengths must be calculated to ensure the correct ﬂue draught will be induced by the proposed ﬂue. The difference in height between the top of the stove and the bottom of the terminal determines the vertical height to be used in the calculation. The ﬂue run may necessitate the vertical elements to be separated by several horizontal runs, this is not important, only the total height gain is needed. The horizontal length is often more tedious to determine, but again, it is the total length which needs to be determined, regardless of their being continuous or in stages. Any 90 degree change of direction within the ﬂue will offer resistance to ﬂue draught and each change of direction will offer the same resistance to the ﬂue draught as a horizontal run of 1000mm. For every 45 degree change in direction the resistance is that of a horizontal run of 500mm.

0

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

BALANCED FLUE ASPECT RATIO DYNAMICS ILLUSTRATED

For 1m vertical rise a flue may have a maximum horizontal run of 7m. For each 90 degree bend introduced the horizontal run must be reduced by 1m. For each 45 degree bend introduced the horizontal run must be reduced by 500mm.

.5m vertical = 3.5m horizontal max.

1m vertical = 7m horizontal max.

Depending on

which direction your

ﬂue conﬁguration

will take and the

model of the stove,

a ﬂue reduction

plate (FRP) may

or may not be

required.

See pages 24 & 25

for details.

6

0

0.5

1.0

0

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

0.5

1.0

1.5

For a 1m vertical rise a flue can have a maximum of 7m horizontal length.

Each additional 90 degree bend creates a draught resistance equal to 1m of horizontal length. Therefore in example 'B' the introduction of 2 x 90 degree bends, in a horizontal plain, reduces the maximum horizontal length by 2m.

Example 'A'

Example 'B'

Example 'C'

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

0

Min 310mm/ Max 440mm

The rear exit flue may have a maximum horizontal run of 440mm from the flue spigot, the minimum length 310mm.

Flue spigot

Basic Principle of Balanced Flue Ratios Illustrated

7

Top to Horizontal High Level

Rear to Horizontal Low Level

8

Example 1: Top to Horizontal High Level Kit

Using the standard top to horizontal high level ﬂue kit only.

Standard kit starter

length T1

Standard kit

terminal length T2

Sleeve kit

(accessory)

Ceramic rope or

Fraxll sealant to

prevent draughts

Standard kit 90

degree long bend

Minimum

50mm

Cavity wall

12mm

Solid wall

MM

Description Part No.

Top to

HorizontalHigh

Level Kit

150mm 180mm

MS91102 MS91103

Sleeve liner MS91065 MS91066

Terminal

guard

FP767 FP767

Closure bezel MS91033 MS91040

Components used

Closure

bezel

Terminal guard

(accessory)

The closure

bezel ﬁts around

the ﬂue pipe

covering the

hole through

a solid wall

giving the

installation

a clean ﬁnish

both inside and

outside.

9

Example 2: Top to Horizontal High Level Kit

Taking the attached diagram as an example we can calculate the ﬂue parameters for a top to horizontal ﬂue system.

Total Height = A

Total Horizontal = B

In this example A = 2.8 Metres B = 1.75 Metres Three x 90 degree bends have been used one of which (C) is the standard supply kit bend. This bend is ignored from the calculation as it is presumed it will always be used. The two remaining 90 degree bends increase the horizontal length by two metres. (one metre extra horizontal length per additional 90 degree bend).

Total Height A = 2.8 Metres

Total Horizontal B = 1.0 Metres

In this example there is sufﬁcient vertical rise for the horizontal run, as shown in the graph on page 6.

Standard kit

terminal length

T2

Standard kit long 90

O

bend

Accessory 250mm

length within wall

Accessory short

90

O

bend

Accessory short

90

O

bend

Accessory 500mm length

Standard kit starter length T1

Accessory 1metre length

Wall band

B

B+B= Total Horizontal

AA Total height

Description Part No. Quantity

Top to

HorizontalHigh

Level Kit

150mm 180mm

1

MS91102 MS91103

1 metre length MS91028 MS91034 1 500mm length MS91029 MS91035 2 250mm length MS91030 MS91036 1 90° short bend MS91031 MS91037 2

Wall band MS91052 MS91053 1

Components used

10

Example 3: Top to Vertical High Level Kit

The ratio of vertical to horizontal lengths must be calculated to ensure the correct ﬂue draught will be induced by the proposed ﬂue. Taking the ratio diagram as an example we can calculate the ﬂue parameters for a top to vertical ﬂue system.

Total Height = A

Total Horizontal = B

In this example A = 3.5 Metres B = 1.5 Metres Two x 90deg bends have been used. The two 90 degree bends increase the horizontal length by two metres. (One metre extra horizontal length per additional 90 degree bend).

Total height A = 3.5 Metres

Total Horizontal B =0.9 Metres

In this example there is sufﬁcient vertical rise for the horizontal run, as shown in the illustration on page 6.

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Description Part No. Quantity

Top to Vertical

High Level Kit

150mm 180mm

1

MS91100 MS91101 1 metre length MS91028 MS91034 1 500mm length MS91029 MS91035 3 90° short bend MS91031 MS91037 2

Wall band MS91052 MS91053 2

Components used

(accessory)

Euroheat Harmony 15, Harmony 25, Stanford 25, Harmony 35, Harmony 45 Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual