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.
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.
Temperature and
Pressure Relief Valve
POWERFLOW
Hot
Drain Cock
To Drain (Waste)
Pressure
(Expansion)
Relief V alve
Expansion
Ve s se l
Check
Valve
Balanced
Cold W ater
Draw O
Pressure
Reducing V alve
Service
Valve
Cold W ater
Mains
Diagram 1
B
A
Diagram 2
Model
Ve
rtical
Bolt
Spacing A (mm)
Horizontal Bolt
Spacing B (mm)
PF30L 270320
PF50L 52
0320
PF90L 430320
Safety Device
Tundish
600mm MAXIMUM
Metal Discharge Pipe (D1) from
Temperature Relief to Tundish
Discharge Below
Fixed Grating
300mm MINIMUM
Metal Discharge Pipe (D2) from
Tundish with Continuous Fall
Fixed Grating
Trapped Gully
Sizing of D2 Copper Discharge pipe for common temperature relief valve outlet size
Valve
outlet
size
Minimum size of
discharge pipe (D1)
Minimum size of
discharge pipe (D2)
from Tund is h
Maximum resistance allowed,
expressed as a length of straight
pipe (I.E. no elbows or bends)
Resistance
created by each
elbow or bend
m8.0m9 ot pumm22mm512/1G
28mm up to 18m 1.0m
m4.1m72 ot*mm53
Diagram 4
Element ange -
Remove to access anode
Thermostat
Thermal cutout -
Press here to reset
H
Diagram 3
WD
Powerflow_Layout 1 28/06/2015 10:09 Page 5
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