Service manual

14
Geothermal Heat Pump Systems
Tranquility
®
22 Digital (TZ) Series IOM - 60Hz HFC-410A
Rev.: 17 Jan., 2013B
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.
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.
Flushing the Earth Loop
Figure 15e: Valve Position D - Pressurize and Operation
Loop
Valve Position
1
Dead Head
Pump to
Pressurize
to 50 PSI
2
Close to isolate
Internal Flow Controller
3
Close Internal
Flow Controller
Valves for
Operation Mode
Out
In
Flush Port
Front of Unit
Valve Position