4. DETERMINING WATER FLOW
a) Flow Meter Meod (see fig 3.)
Ensure isolation valves ‘A’ and ‘B’ and bypass valve ‘C’ are fully open.
Slowly close down bypass valve ‘C’ until correct flow rate (see data
sheets) is shown on e flow meter. Remove handle and lock off valve
‘C’.
b) Differential Pressure Meod (see fig 3).
By simply installing two filter pressure indicating gauges, one each on
e inlet and outlet of e heat pump, and a locking type gate bypass
valve in e bypass line, e flow rate rough e heat pump can be
accurately determined by e difference in e readings of e gauges.
This pressure drop is proportional to flow.
Flow rate should be set at e maximum differential wi a clean filter
if fitted. is differential pressure will drop as e filter becomes dirty.
Provided e filter is cleaned before e minimum differential is reached
(which would normally be e case wi a well managed system) en
no problems should be encountered.
Setting up e differential
When e installation is complete, e procedure for setting e flow
rate rough e heat pump using two gauges is as follows:
1. Wi e heat pump switched off, ensure isolation valves ‘A’, ‘B’
and bypass valve ‘C’ are fully open.
2. Switch on water circulating pump.
3. Note e water system pressure on bo gauges - ey should read
e same, but because of manufacturing tolerance ey may read
different.
For example – wi a water system pressure of 5mhd e gauge
on e inlet may read 5 and e outlet gauge 5·5 erefore ere is
a STATIC ERROR DIFFERENCE of 0·5mhd.
4. Gradually close e bypass valve ‘C’ until ere is a difference in
pressure between e two gauges at is equal to e required
pressure drop (see data sheets) observing any static error on e
gauges before beginning is process.
5. Lock e bypass valve, or render it tamper proof, when correct
setting is achieved.
6. See data sheets for correct pool water pressure drop.
10
SD566250 ISSUE 35
PR0-PAC SYSTEM OWNER INSTALLATION MANUAL
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