Enertech AV Series - Flush Cart Design; Flushing and Filling System

Enertech Global, LLC 29
AV : MD/ME - Rev. A Models
Installaon and Operaons Manual
Flush Cart Design
The Enertech Manufacturing ush cart has been designed to
eecvely and eciently ush the earth loop and to facilitate
injecng and mixing of the anfreeze.
Removing Debris During Flushing
Most ow center or pump failures are a result of poor water
quality or debris. Debris entering the loop during fusion and
installaon can cause noise and premature pump failure.
Enertech recommends a double ush ltering method during
purging. When purging, use a 100 micron bag lter unl air
bubbles are removed. Remove the 100 micron bag, replace it
with a 1 micron bag and restart the ushing.

• Cylinder: HDPE, SDR15.5, 10” dia. (10 Gallons)
• Pump: Myers High Head QP15, 1.5hp, 115V
• Hose connecons: Cam Lock quick connects - 1-1/2”
hoses
• Hand Truck: 600lb rang with pneumac res
• Wiring: Liquid Tight metal on/o switch
• Tubing: SDR11 HDPE
• Connecons: 2 - 3/4” connecons for anfreeze and
discharge
• Drain: one on the pump and the tank
0 10 20 30 40 50 60 70 80 90
CAPACITY - U.S. GPM
120
110
100
90
80
70
60
50
40
30
20
10
Total Head in Feet
SUCTION LIFT
25’
20’
15’
Meyers QP-15
1-1/2 HP Self-Priming
Centrifugal Pump
Flush Cart Pump Curve:
Enertech Flush Cart:
Flushing and Filling System
The system needs to be ushed of air and debris, and lled
before it is turned on and put into service. All systems have
dirt and debris from the piping, soldering, etc. Enertech
recommends using a ush cart to the purge the system. The
ush cart should ulize a ½ HP pump, which is sucient for
almost all residenal hydronic systems, as long as each circuit
is isolated and ushed one at a me.

1. Isolate each circuit, including the heat pump and domesc
hot water tank.
2. Flush each zone of air, and ll each zone with water
(radiant tubing, air handler, etc.).

This step can be skipped if the unit is not equipped with hot
water capability.
1. Open the isolaon valves and ush/ ll the hot water tank
(if equipped), making sure to keep the system pressure
below 30 PSI.
Note: If the pressure gets above 30 PSI, the relief valve on
the tank will purge water.
2. Close the isolaons valves
Step 3: Heat Pump
1. Open the isolaon valves and ush/ ll the heat pump,
making sure that the water ow direcon is as it would be
in normal operaon.
Note: Water ow direcon is crucial during this step. If the
water ow is backwards, the Wye Strainer is not protecng
the braze plate heat exchangers from the miscellaneous
debris that hasn’t been ushed out into the ush cart.
2. Once the enre system has been ushed and lled, the
anfreeze and water treatment can be added, using the
ush cart to add and mix the treatment. All zones should
be open during this process, so that proper mixing can
take place.
3. Take mulple readings, and check the anfreeze
percentage, as the system is being mixed.
4. The nal step is to go through the set up wizard on the
controller (HMI) to energize the diverng valve (if
equipped) and verify that the last bit of air is removed
from the system.
5. Turn the 3-way valves on the ush valves back to the
normal operaon mode, which closes the ush port
connecons.
6. Open the ball valves on the ush cart to relieve pressure on
the hoses. Disconnect the hoses from the ush valves.
Note: If any small amount of air is sll in the system, the air
eliminaon device will remove it and the make-up water, as
well as the expansion tank, will keep pressure on the system.
Recommended pressure seng is 12-17 PSI cold = 15-19 PSI
hot.
The enre system is now ushed, lled, treated, and ready to
be put into operaon.
⚠ WARNING ⚠
MAKE SURE TO ISOLATE THE DOMESTIC WATER TANK
BECAUSE THE RELIEF VALVE INSTALLED IN THE TANK
WILL PURGE WATER AS THE SYSTEM IS FLUSHED.
Secon 5: Unit Piping