FASTflo WH42 Mode d’emploi

Working towards

a cleaner future

FASTflo

Installation Design Guide

This manual must be kept with the appliance October 2010

Part No E835

Continuous Flow Wall Hung Balance Flue

Water Heaters for Natural Gas an Propane

WH42, WH56, WHX56, LWH56, WHX56, LWHX56

Repro uction of any information in this publication by any metho is not permitte

unless prior written approval has been obtaine from An rews Water Heaters.

An rews Storage Water Heaters have been esigne an manufacture to comply

with current international stan ar s of safety. In the interests of the health an safety

of personnel an the continue safe, reliable operation of the equipment, safe working

practices must be employe at all times. The attention of UK users is rawn to their

responsibilities un er the Health an Safety Regulations 1993.

All installation an service on An rews Water Heaters must be carrie out by properly

qualifie personnel an , therefore, no liability can be accepte for any amage or

malfunction cause as a result of intervention by unauthorise personnel.

An rews Water Heaters’ policy is one of continuous pro uct improvement an ,

therefore, the information in this manual, whilst completely up to ate at the time of

publication, may be subject to revision without prior notice.

Further information an assistance can be obtaine from:

An rews Water Heaters

Woo Lane, Er ington,

Birmingham B24 9QP

Tel: 0845 070 1055

Fax: 0845 070 1059

Email: an rews@baxigroup.com

Website: www.an rewswaterheaters.com

THE ANDREWS WATER HEATERS COVERED IN THIS GUIDE

ARE FOR USE WITH NATURAL GAS OR PROPANE ONLY

Andrews Installation Design Guide for WH and WHX Model Water Heaters

Fig No. DESCRIPTION

1Typical Installation - Single Heater

2Typical Installation - Single Heater with Secondary Return

3Typical Installation - Two Heaters

4Typical Installation - Two Heaters with Quick Connect Cord

5Typical Installation - Three Heaters with Secondary Return

6Typical Installation - Four Heaters with Electronic System Controller Kit

7Technical Note - Water Flow Rates and Performance Chart

8Typical Installation - Electronic System Controller Kit

9Technical Note - Unvented System Kits

10 Typical Installation - Single Heater with ST Range Storage Cylinder

11 Typical Installation - Two Heaters with ST Range Storage Cylinder,

Quick Connect Cord and Secondary Return

12 Typical Installation - Three Heaters with ST Range Storage Cylinder

and Secondary Return

13 Technical Note - Flow Rate Head Loss and Pump Sizing

14 Technical Note - Pump Curves

15 Heater Dimensions - WH56 and LWH56

16 Heater Dimensions - WHX42, LWHX42, WHX56 and LWHX56

17 WH42, LWH42, WH56 and LWH56 Pre-assembled dual manifold unit dimensions

18 WH42, LWH42, WH56 and LWH56 Pre-assembled triple manifold unit dimensions

19 WHX56 and LWHX56 Pre-assembled dual manifold unit dimensions

20 WHX56 and LWHX56 Pre-assembled triple manifold unit dimensions

Please refer to the

FASTflo Specification

Sheet and Flue Selection

Guide for Flue Kit and

termination details

Remote controller kit

(part no. B285)

Gas

HWS flow

Hot Outlets

Water Supply Pressure

Min 1.0 bar

Max 10.0 bar

Min flow 3.5 ltrs/min

1. Stop cock

Gas rate for NG units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas rate for Propane units

LWH42 - 1.9 m3/hr

LWH56, LWHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

Andrews WH and WHX Single Water Heater Installation Without Secondary Return

Fig No.1

Cold Supply

Please refer to the

FASTflo Specification

Sheet and Flue

Selection Guide for

Flue Kit and

termination details

Remote controller kit

(part no. B285)

Gas

HWS flow

Hot Outlets

Cold Supply

1. Stop cock

2. Strainer

3. Pressure reducing valve

4. Non return valve

5. Expansion vessel

6. Expansion valve + tundish

7. Andrews bronze pump c/w

ball valve unions (part no. B249)

Water Supply Pressure

Min 1.0 bar

Max 10.0 bar

Min flow 3.5 ltrs/min

Bronze secondary return pump

see Fig. No’s. 13 and 14

Gas rate for NG units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas rate for Propane units

LWH42 - 1.9 m3/hr

LWH56, LWHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

123 4

Andrews WH and WHX Single Water Heater Installation with Secondary Return

Fig No.2

Remote controller kit

(part no. B285)

Gas

HWS flow Where output may be below

7 ltrs/min see Fig. No. 4

Cold Supply

1. Stop Cock

Water Supply Pressure

Min 1.0 bar

Max 10.0 bar

Gas rate for NG units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas rate for Propane units

LWH42 - 1.9 m3/hr

LWH56, LWHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

Andrews WH and WHX Multiple Water Heater Installation without Secondary Return

Fig No.3

Please refer to the

FASTflo Specification

Sheet and Flue Selection

Guide for Flue Kit and

termination details

Andrews WH and WHX Multiple Water Heater Installation with Quick Connect Cord Kit

Fig No.4

Single remote

controller

Gas

HWS flow

Hot Outlets

Cold Supply

1. Stop Cock

Water Supply Pressure

Min 1.0 bar

Max 10.0 bar

Quick Connect Cord Kit

(part no. B286)

Gas rate for NG units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas rate for Propane units

LWH42 - 1.9 m3/hr

LWH56, LWHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

Please refer to the

FASTflo Specification

Sheet and Flue Selection

Guide for Flue Kit and

termination details

Andrews WH and WHX Multiple Water Heater Installation with Secondary Return

Fig No.5

Remote

controller

kit (part no

B285)*

*An Electronic System Controller Kit

can be used as an alternative when

manifolding up to six units. (see Fig.

No’s 6 and 8)

Gas

HWS flow

Hot Outlets

Cold Supply

Bronze secondary return pump

see Fig. No’s. 13 and 14

Gas rate for NG units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas rate for Propane units

LWH42 - 1.9 m3/hr

LWH56, LWHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

1 2 3 4

Please refer to the

FASTflo Specification

Sheet and Flue Selection

Guide for Flue Kit and

termination details

1. Stop cock

2. Strainer

3. Pressure reducing valve

4. Non return valve

5. Expansion vessel

6. Expansion valve + tundish

7. Andrews bronze pump c/w

ball valve unions

(part no. B249)

Andrews WH56 and WHX56 Multiple Water Heater Installation with System Controller Kit

Fig No.6

Single remote

controller

System Controller in unit No. 1

(see Fig. No. 8)

Gas

HWS flow

Hot Outlets

Cold Supply

Gas rate per NG units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas rate for Propane units

LWH42 - 1.9 m3/hr

LWH56, LWHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

1. Stop Cock

Water Supply

Pressure

Min 1.0 bar

Max 10.0 bar

Please refer to the

FASTflo Specification

Sheet and Flue

Selection Guide for

Flue Kit and

termination details

Andrews WH and WHX Water Flow Rates

Performance Chart

Fig No.7

Andrews Model Temperature Temperature Temperature Temperature Temperature Temperature

Reference

Rise 25ºC Rise 35ºC Rise 45ºC Rise 55ºC Rise 65ºC Rise 75ºC

L sec L min L sec L min L sec L min L sec L min L sec L min L sec L min

WH42,LWH42 0.40 24.0 0.29 17.4 0.22 13.2 0.18 10.8 0.15 9.2 0.13 8.0

WH56, LWH56 0.53 31.8 0.38 22.8 0.30 18.0 0.24 14.4 0.20 12.3 0.18 10.6

WHX56,LWHX56 0.53 31.8 0.38 22.8 0.30 18.0 0.24 14.4 0.20 12.3 0.18 10.6

The flow rate will vary dependant upon the temperature selected at outlet and the incoming water temperature.

The flow rate can be calculated using the following formula or by reference to the charts above.

In addition to the above the maximum flow through each heater is pre-set independent of temperature, maximum flow rate for the

WH42 is 24 L/min and maximum flow rate for the WH56 and WHX56 is 31.8 L/min.

WH42, LWH42 = 42 kW output

WH56, LWH56 = 55.8kW output

WHX56, LWHX56 = 55.8 kW output

(heater output) kW

Δt (temperature rise) x 4.2 specific heat

Flow rate L/S =

Water flow

at different

temperature

rises

Ce manuel convient aux modèles suivants

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