ClimateMaster tranquility 30 - Multiple Units with Internal Flow Controllers and External Flushing Valves

16
Geothermal Heat Pump Systems
PRELIMINARY
Tranquility
®
30 Digital (TE) Series IOM - 60Hz HFC-410A
Rev.: 3 Aug., 2012B
Multiple Unit Piping and Flushing
Water Out
Water In
Heat Pump
B
Water Out
Water In
Heat Pump
A
To Ground
Loop
Water Out
Water In
Heat Pump
C
Indoor Loop
Shut-Off Valve
Ground Loop
Shut-Off Valve
Flush
Valve
Size for Heat Pump
‘A’ Flow
Size for ‘A’ + ‘B’ Flow
Size for ‘A’ + ‘B’ + ‘C’ Flow
Size for
Heat Pump
‘C’ Flow
Size for
Heat Pump
‘B’ Flow
Water Out
Water In
Heat Pump
B
Water Out
Water In
Heat Pump
A
To Ground
Loop
Size for Heat Pump
‘A’ Flow
Size for Heat Pump
‘B’ Flow
Size for ‘A’ + ‘B’ Flow
Figure x: Multiple Units with Internal Flow Controllers
Figure x: Multiple Units with Internal Flow Controllers and External Flushing Valves
Multiple Units with Internal Flow Controllers and External Flushing Valves
When the number of units or fl ushing requirements reaches a point where it
is no longer feasible to fl ush through the internal valves (generally systems of
more than 12 tons depending on loop design), external fl ushing valves should
be installed. In this case, three-way fl ushing valves should be used or additional
isolation valves must be installed to be able to isolate the loop during fl ushing.
First, fl ush the ground loop. The installer should close the indoor loop shut-
off valve (or the internal fl ushing valves in all units) and open the ground
loop shut-off valve to prevent fl ow through the indoor loop while fl ushing the
ground loop.
Once the ground loop is fl ushed, close the ground loop shut-off valve
and open the indoor loop valve(s) to fl ush the units and indoor piping.
Remember that there is an internal check valve in the variable speed pump
and that backward fl ow the unit is not possible.