Andrews WH42 Guida

INSTALLATION DESIGN GUIDE

Andrews. Built to perform.

Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference.

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WH42, WH56, WHX56, LWH56, WHX56, LWHX56, WHC56, LWHC56

Part number E835

2 Draft A 18/07/16

Andrews Water Heaters

Reproduction of any information in this publication by any

method is not permitted unless prior written approval has been

obtained from Andrews Water Heaters.

Andrews Storage Water Heaters have been designed and

manufactured to comply with current international standards of

safety. In the interests of the health and safety of personnel and

the continued safe, reliable operation of the equipment, safe

working practices must be employed at all times. The attention

of UK users is drawn to their responsibilities under the Health

and Safety Regulations 1993.

All installation and service on Andrews Water Heaters must be

carried out by properly qualified personnel and, therefore, no

liability can be accepted for any damage or malfunction caused

as a result of intervention by unauthorised personnel.

Andrews Water Heaters’ policy is one of continuous product

improvement and, therefore, the information in this manual,

whilst completely up to date at the time of publication, may be

subject to revision without prior notice.

Further information and assistance can be obtained from:

Customer support

Monday - Friday

8am - 5pm

ales: 0345 070 1055

Technical: 0345 070 1057

Email: [email protected]

Website: www.andrewswaterheaters.co.uk

Twitter: @andrewsWH

Draft A 18/07/16 3

Contents

1 Installations

1.1 WH and WHX single water heater installation without secondary return

1.2 WH and WHX single water heater installation with secondary return

1.3 WH and WHX multiple water heater installation without secondary return

1.4 WH and WHX multiple water heater installation with quick connect cord kit

1.5 WH and WHX multiple water heater installation with secondary return

1.6 WH56 and WHX56 multiple water heater installation with system controlller kit

1.7 WH and WHX single water heater installation with ST range storage cylinder

1.8 WH and WHX multiple water heater installation with ST range storage cylinder, quick

connect cord kit and secondary return

2 Water flow rates

2.1 WH and WHX water flow rates

3 Controller kit

3.1 System controller kit (part no. B287) for WH56, WH56 and WHX56

FA Tflo Installation design guide for WH and WHX model water heaters

4 Draft A 18/07/16

1 Installations

1.1 WH and WHX single water heater installation without secondary return

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 upply Pressure

Min 1.0 bar

Max 10.0 bar

Min flow 3.5 ltrs/min

Gas Rate for NG Units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas Rate for Propane Units

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

Cold Supply

1. Stop Cock

Fig. 1

1.2 WH and WHX single water heater installation with secondary return

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

Bronze secondary return pump

Hot Outlets

Water upply Pressure

Min 1.0 bar

Max 10.0 bar

Min flow 3.5 ltrs/min

Gas Rate for NG Units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas Rate for Propane Units

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

12 34

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)

Fig. 2

Draft A 18/07/16 5

Installations 1

1.3 WH and WHX multiple water heater installation without secondary return

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 Where output may

be below 7 ltrs/min

see Fig. 4

Water upply 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

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

Cold Supply

1. Stop Cock

Fig. 3

1.4 WH and WHX multiple water heater installation with quick connect cord kit

Please refer to the FASTflo

specification sheet and flue

selection guide for flue kit and

termination details.

Single remote

controller

Gas

HWS flow

Quick connect cord kit

(part no. B286)

Hot Outlets

Water upply 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

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

Cold Supply

1. Stop Cock

Fig. 4

6 Draft A 18/07/16

1 Installations

1.5 WH and WHX multiple water heater installation with secondary return

Please refer to the FASTflo

specification sheet and flue

selection guide for flue kit and

termination details.

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. 6 and 10)

Gas

HWS flow

Cold supply

Bronze secondary return pump Hot outlets

1234

Gas Rate for NG Units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas Rate for Propane Units

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

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)

Fig. 5

1.6 WH56 and WHX56 multiple water heater installation with system controller kit

Please refer to the

FASTflo specification

sheet and flue

selection guide for

flue kit and

termination details.

Single remote

controller

Gas

HWS flow

System controller in

unit No.1 (see Fig. 10)

Hot Outlets

Water upply

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

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

Cold Supply

1. Stop Cock

Fig. 6

Draft A 18/07/16 7

Installations 1

1.7 WH and WHX single water heater installation with T range storage cylinder

Please refer to the FASTflo

specification sheet and flue

selection guide for flue kit and

termination details.

Remote

controller

set to 70°C

Gas

HWS flow

Cold supply

Tank thermostat kit (part no.

C927) set to 65°C

NB. size mains pressure group

to suit building design flow rate

Storage

cylinder

Pump

Hot outlets

1234

Gas Rate for NG Units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas Rate for Propane Units

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

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)

8. Combined temperature

and pressure relief valve

+ tundish

Fig. 7

1.8 WH and WHX multiple water heater installation with T range storage cylinder,

quick connect cord kit and secondary return

Please refer to the

FASTflo specification

sheet and flue selection

guide for flue kit and

termination details.

Remote controller

set to 70°C

Storage

cylinder

Pump

Quick connect cord kit

(part no. B286)

Cold supply

NB. Size mains pressure group to

suit building design flow rate

Bronze secondary pump

Tank thermostat kit (part

no. C927) set to 65°C

Gas

HWS flow

Hot Outlets

Gas Rate for NG Units

WH42 - 5.1 m3/hr

WH56, WHX56 - 6.5 m3/hr

Gas Rate for Propane Units

WH42 - 1.9 m3/hr

WH56, WHX56 - 2.5 m3/hr

Dynamic Pressure

NG 20 mbar

Propane 37 mbar

1234

Fig. 8

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)

8. Combined temperature

and pressure relief valve

+ tundish

8 Draft A 18/07/16

2 Water flow rates

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 referance 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 /min and maximum flow rate for the WH56

and WHX56 is 31.8 /min.

WH42, WH42 = 42 kW output

WH56, WH56 = 55.8 kW output

WHX, WHX56 = 55.8 kW output

Flow rate /S = (Heater output) kW

∆t (temperature rise) x 4.2 specific heat

2 Water Flow Rates

2.1 WH and WHX water flow rates

Performance Chart

Andrews Model Temperature Temperature Temperature Temperature Temperature Temperature

Reference Rise 25°C Rise 35°C Rise 45°C Rise 55°C Rise 65°C Rise 75°C

sec min sec min sec min sec min sec min sec min

WH42, WH42 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, WH56 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, WHX56 0.53 31.8 0.38 22.8 0.30 18.0 0.24 14.4 0.20 12.3 0.18 10.6

Water flow

at different

temperature

rises

Fig. 9

Draft A 18/07/16 9

Controller kit 3

3 Controller kit

3.1 ystem controller kit (part No. B287) for WH56, LWH56 and WHX56

The System Controller Kit can be used as an alternative to the

Quick Connect Cord Kit (two unit installation) or for controlling

up to six manifolded water heaters.

The master unit (No.1) contains the System Controller module

and includes plug connectors to enable the control cords from

the other units to be connected up to the master unit.

In addition the System Controller incorporates the following

standard features, BEMS fault indication, Remote `Power On'

indication, Primary Pump connection via cylinder thermostat,

Secondary Circulation Pump connection and Remote Switching.

A comprehensive installation manual is available from our sales

department.

ystem operation

The control panel randomly selects some heaters at the ready

stage and some at the standby stage, and heaters will start

dependent upon water flow and temperature settings.

The system rotates the lead and standby units after every eight

hours operating time.

As the flow rates increases additional units will fire thus

maintaining the required system flow temperature.

The remote controller must be connected to Unit No.1 and

temperature settings on this controller will be communicated to

the other manifolded heaters on the system.

The System Controller is not required when the installation

incorporates a storage cylinder / buffer vessel or if a constant

large volume of hot water is required.

Unit No. 1

Unit No.2

Unit No.3

Unit No. 4Unit No.5

Unit No.6

System controller kit

(Part No. B287)

Typical installation

Single remote

controller

Fig. 10

10 Draft A 18/07/16

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