Wh And Whx Multiple Water Heater Installation With Secondary Return - andrews FASTflo WH42 Installation Design Manual

1 Installations
1.5

WH and WHX multiple water heater installation with secondary return

Fig. 5
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)
1 2 3
Cold supply
Bronze secondary return pump
* An electronic system controller kit can be used as an alternative when manifolding up to six units. (see Fig. 6 and 10)
1.6 WH56 and WHX56 multiple water heater installation with system controller kit
Fig. 6
Please refer to the
FASTflo specification
sheet and flue
selection guide for
flue kit and
termination details.
Water Supply
Pressure
Min 1.0 bar
Max 10.0 bar
1
Cold Supply
1. Stop Cock
Gas Rate for NG Units
WH42 - 5.1 m
WH56, WHX56 - 6.5 m
Gas Rate for Propane Units
LWH42 - 1.9 m
LWH56, LWHX56 - 2.5 m
6
5
6
4
4
7
/hr
3
/hr
3
/hr
3
/hr
3
HWS flow
Dynamic Pressure
NG 20 mbar
Propane 37 mbar
Remote
controller
kit (part
no. B285)*
Gas Rate for NG Units
WH42 - 5.1 m /hr
3
WH56, WHX56 - 6.5 m
Gas Rate for Propane Units
LWH42 - 1.9 m
3
LWH56, LWHX56 - 2.5 m
Gas
Dynamic Pressure
NG 20 mbar
Propane 37 mbar
HWS flow
Hot outlets
System controller in
unit No.1 (see Fig. 10)
Gas
Hot Outlets
Draft A 18/07/16
/hr
3
/hr
/hr
3
Single remote
controller