Summary of Contents for FASTflo WH42
- Page 1 This manual must be kept with the appliance October 2010 Part No E835 FASTflo Installation Design Guide Continuous Flow Wall Hung Balanced Flue Water Heaters for Natural Gas and Propane WH42, WH56, WHX56, LWH56, WHX56, LWHX56 Working towards a cleaner future...
- Page 2 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.
- Page 3 WH56 and LWH56 Heater Dimensions - WHX42, LWHX42, WHX56 and LWHX56 WH42, LWH42, WH56 and LWH56 Pre-assembled dual manifold unit dimensions WH42, LWH42, WH56 and LWH56 Pre-assembled triple manifold unit dimensions WHX56 and LWHX56 Pre-assembled dual manifold unit dimensions WHX56 and LWHX56 Pre-assembled triple manifold unit dimensions...
- Page 4 Remote controller kit (part no. B285) Please refer to the Gas rate for NG units FASTflo Specification WH42 - 5.1 m Sheet and Flue Selection WH56, WHX56 - 6.5 m Guide for Flue Kit and termination details Gas rate for Propane units LWH42 - 1.9 m...
- Page 5 Fig No.2 Andrews WH and WHX Single Water Heater Installation with Secondary Return Gas rate for NG units Please refer to the WH42 - 5.1 m FASTflo Specification Remote controller kit Sheet and Flue WH56, WHX56 - 6.5 m (part no. B285)
- Page 6 (part no. B285) Please refer to the FASTflo Specification Gas rate for NG units Sheet and Flue Selection WH42 - 5.1 m Guide for Flue Kit and termination details WH56, WHX56 - 6.5 m Gas rate for Propane units LWH42 - 1.9 m Water Supply Pressure LWH56, LWHX56 - 2.5 m...
- Page 7 Please refer to the controller FASTflo Specification Gas rate for NG units Sheet and Flue Selection WH42 - 5.1 m Guide for Flue Kit and WH56, WHX56 - 6.5 m termination details Gas rate for Propane units LWH42 - 1.9 m Water Supply Pressure LWH56, LWHX56 - 2.5 m...
- Page 8 No’s 6 and 8) B285)* Sheet and Flue Selection Guide for Flue Kit and termination details Gas rate for NG units WH42 - 5.1 m 1. Stop cock WH56, WHX56 - 6.5 m 2. Strainer 3. Pressure reducing valve 4. Non return valve Gas rate for Propane units 5.
- Page 9 Flue Kit and termination details Water Supply Pressure Gas rate per NG units Min 1.0 bar WH42 - 5.1 m Max 10.0 bar WH56, WHX56 - 6.5 m Gas rate for Propane units LWH42 - 1.9 m Cold Supply LWH56, LWHX56 - 2.5 m...
- Page 10 WHX56, LWHX56 = 55.8 kW output 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.
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Page 11: Typical Installation
Fig No.8 Andrews System Controller Kit (Part No. B287) for WH56, LWH56, 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. - Page 12 Fig No.9 Andrews WH & WHX Unvented System Kits If continuous flow water heaters are used on circulation systems or linked to a storage cylinder/buffer vessell Unvented System Kit an unvented system kit is required to allow for expansion of the hot water system. The kit includes the Part No.
- Page 13 4. Non return valve 5. Expansion vessel 6. Expansion valve + tundish 7. Andrews bronze pump c/w Gas rate for NG units ball valve unions (part no. WH42 - 5.1 m B249) Pump Storage WH56, WHX56 - 6.5 m 8. Combined temperature (See Fig.
- Page 14 5. Expansion vessel 6. Expansion valve + tundish Gas rate for NG units 7. Andrews bronze pump c/w Quick connect WH42 - 5.1 m ball valve unions (part no. Pump cord kit (part no. B249) WH56, WHX56 - 6.5 m Storage (See Fig.
- Page 15 (part no. B249) Cylinder 8. Combined temperature Gas rate for NG units and pressure relief valve WH42 - 5.1 m + tundish WH56, WHX56 - 6.5 m Gas rate for Propane units Cold Supply Tank thermostat kit (part LWH42 - 1.9 m...
- Page 16 The pump must be sized to give a minimum flow rate of 8 L/min through each heater. The head loss through the FASTflo range of products is due to the friction generated when the water flows through the heat exchanger and associated components.
- Page 17 Fig No.14 Pump Curves for Andrews 3 Speed Bronze Circulating Pump. Part No.B249 SPEED 3 SPEED 2 SPEED 1 Q(1/s)
- Page 18 Fig No.15 Dimensions WH42/LWH42/WH56 and LWH56...
- Page 19 Fig No.16 Dimensions WHX56 and LWHX56...
- Page 20 Fig No.17 WH42, LWH42, WH56 and LWH56 Pre-assembled dual manifold unit dimensions...
- Page 21 Fig No.18 WH42, LWH42, WH56 and LWH56 Pre-assembled triple manifold unit dimensions...
- Page 22 Fig No.19 WHX56 and LWHX56 Pre-assembled dual manifold unit dimensions Note: Pipework covers are optional...
- Page 23 Fig No.20 WHX56 and LWHX56 Pre-assembled triple manifold unit dimensions Note: Pipework covers are optional...
- Page 24 Sales: Baxi Commercial Division 0845 070 1056 Wood Lane, Erdington, Birmingham B24 9QP Technical: Email: andrews@baxigroup.com 0845 070 1057 www.andrewswaterheaters.co.uk...