Carrier 50YFV Installation, Operation And Maintenance Instructions page 14

R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P B S e r i e s - 6 0 H z P u r o n
R e v : 4 A p r i l , 1 4
Flushing the Earth Loop
the fl ush cart from the Internal Flow Controller. Install Flow
Controller caps to ensure that any condensation/leakage
remains contained within the Flow Controller package.
If the loop pressure is between 50 and 75 psi [345 to 517
kPa] upon completion of fl ushing, pressures should be
suffi cient for all seasons.
Figure 15e: Valve Position D - Pressurize and Operation
2
Close to isolate
Internal Flow Controller
1
Dead Head
Pump to
Pressurize
to 50 PSI
Front of Unit
Valve Position
14
3
Close Internal
Flow Controller
Valves for
Operation Mode
Loop
Valve Position
Out
In
NOTICE: It is recommended to run the unit in the cooling,
then heating mode for 15-20 minutes each to 'temper' the
fl uid temperature and prepare it for pressurization. This
procedure helps prevent the periodic "fl at" loop condition of
no pressure.
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