Electrical Connections - Hyco Powerflow Instruction Manual

Diagram 3 illustrates an acceptable discharge pipe arrangement. The table below the diagram specifies how
the maximum acceptable pipe length from the tundish to the final outlet depends on the pipe diameter and
the number of bends (reference the chart on page 4 for pipe sizing).
For example in 22mm copper with no bends the pipe could be up to 9m long. With two bends present the
maximum length drops to 9.0m - (2 x 0.80m) = 7.4m.
Diagram 3
Safety Device
Metal Discharge Pipe (D2) from
Tundish with Continuous Fall
Sizing of D2 Copper Discharge pipe for common temperature relief valve outlet size
Valve Minimum size of
outlet discharge pipe (D1)
size
G 1 2 / 5 1 m m

Electrical connections

• The heater is supplied pre-wired with appropriate cable.
• Electrical installation should conform to the latest edition of the IEE Wiring Regulations.
• Electrical supply should be capable of isolation via a user-accessible double pole isolation switch rated
for a 13A supply.
3. Commissioning
Visually re-confirm all plumbing and electrical connections are sound.
• Open a hot water tap and turn on mains water supply to the Powerflow heater.
• Allow unit to fill and leave tap running for a short time to flush out the pipework and purge any air from
the system before closing the hot tap and checking the system for any leaks.
Check the operation of the Temperature and Pressure relief valve located at the top of the heater twisting the
knob at the top of the valve. This lifts the valve seat and water will flow rapidly and be visible at the tundish.
Metal Discharge Pipe (D1) from
Temperature Relief to Tundish
600mm MAXIMUM
300mm MINIMUM
Minimum size of
discharge pipe (D2)
from Tundish
2 2 m m
28mm
5 3 m m
Tundish
Discharge Below
Maximum resistance allowed,
expressed as a length of straight
pipe (I.E. no elbows or bends)
p u o t 9 m
up to 18m
* o t 7 2 m
Fixed Grating
Fixed Grating
Trapped Gully
Resistance
created by each
elbow or bend
0 8 . m
1.0m
1 4 . m