Northern Heatpump NorthStar RD-WE-096 Installation & Operating Instructions Manual - page 16
08/19/2014
14
NI701
To Earth Loop
From Earth Loop
From
Flush
Cart
To
Flush
Cart
Step 3
From Heat Pump
To Heat Pump
Step 5
To
Flush
Cart
From
Flush
Cart
From Heat Pump
To Heat Pump
To Earth Loop
From Earth Loop
Step 6B
From Heat Pump
To Heat Pump
Step 6A
From
Flush
Cart
Pressurize Loop
Flushing and Filling the System Using 3-Way Valves
Step 1
Use water and a high volume head circulator pump to flush air and debris and to fill the loop system.
•
Refer to recommendations provided by IGSHPA or CGC when choosing a pump for the flushing process.
•
It is recommended that pump suction be from the bottom of a large volume container. Use a suction line
strainer to prevent debris discharged into the container from being recycled to the system.
Step 2
Pump water into the system by connecting the pump discharge hose to one (not both) of the 1.00” NPT water
connections located on the sides of the module.
Connect a return hose to the opposite side of the module to discharge debris and air as water is added to the
loop.
Step 3
Rotate the module valves as shown in step 3 diagram:
Step 4
Start the pump. Add anti-freeze and water to the container as needed so that no air enters the system. This will
push any air out of the loop. If flushing assembly is equipped with valves to reverse flow direction, do so
occasionally to help remove trapped air. When bubbles cease in the return hose container, the earth loop has
been completely flushed.
Step 5
Flush the heat pump. To do so, simply rotate the valves as
shown in step 5 diagram while the pump is running. Flush the
heat pump using the same procedure as used to flush the
earth loop.
Pressurizing the System (does not apply to Figure 5)
Step 6
After flushing and filling the system, rotate the module valve
discharging into the flush container as shown in step 6A
diagram to pressurize the loop. Then turn the valves as in step
6B.
Step 7
Turn off the flush cart pump. The system should remain
pressurized. Release excess pressure by rotating either
module valve to allow a small amount of water to pass
through and out of the system and into the container. Some
initial loss of pressure can be expected and is due to the
expansion of the earth loop pipe under pressure. The pressure
will stabilize if the system has no leaks.
Step 8
Flushing, filling and pressurization should be complete. Start
the loop pump module circulators.
Step 9
Troubleshoot. If for some reason the circulators are not
operating, power off and diagnose the problem.