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14
FLOW CENTER INSTALLATION AND LOOP FLUSHING MANUAL
Flushing & Charging (cont.)
To Flush Unit Only: (Used When Replacing Unit, Coax, Hose Kit or Pump)
Connect unit to fl ow center.
Rotate 3-way valves to isolate ground loop and gain access to unit side only as shown in Figures 11a and 11b.
Remove access port caps/plugs and install boiler drain adapters for garden hose connection to the fl ow center.
Attach garden hose to domestic water supply.
Purge air from garden hose before connecting to port in fl ow center.
Attach another length of garden hose to the other port in the fl ow center, leading to drain.
Flush fl ow center and unit with domestic water until all air is removed.
Close boiler drain valve on discharge hose and pressurize system to domestic water pressure, approx. 40-75 psi (276-
517 kPa).
Remove bleed screw(s) from loop pumps to purge air from them.
Close boiler drain valve on supply hose to trap pressure in the system.
Rotate 3-way valves back to the normal operating position (see Figures 12a and 12b).
Turn off water supply, disconnect hoses, remove fl ush adapters, and replace access port caps/plugs.
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Figure 11a: FPT Style
Figure 11b: GL Style
HEAT PUMP
CONNECTIONS
GROUND LOOP
CONNECTIONS
Valve Positioning