Enertech Global
EAV - EME/EMD Rev. A Models
Installaon and Operaons Manual
If the unit will be used for cooling, anfreeze must be added
on the load side of the system to protect the braze plate heat
exchanger from rupturing. Chilled soluon set points are in the
40’s °F. The load soluon so within the heat exchanger, could be
near freezing. To protect against freezing. Enertech recommends
the use of Propylene Glycol (20-25%) for the load side anfreeze.
Addional inhibitor may be required if the concentraon is less
than 25% to 30% (depending upon brand) to provide corrosion
protecon and prevent bacterial growth.
Propylene glycol concentraons below 30% typically
require addional inhibitors to be added to the soluon.
Enertech recommends Fernox F1. Reference
for addional anfreeze informaon.
The minimum recommended air handler size is 2 tons.
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 ulize a ½ HP pump, which is sucient for
almost all residenal hydronic systems, as long as each circuit is
isolated and ushed one at a me.
First, isolate each circuit, including the heat pump and domesc
hot water tank. Then, ush each zone of air, and ll each zone
with water (radiant tubing, air handler, etc.).
Third, open the isolaon valves and ush/ ll the heat pump,
making sure that the water ow direcon is as it would be in
normal operaon.
Water ow direcon is crucial during this step. If the
water ow is backwards, the Wye Strainer is not protecng the
braze plate heat exchangers from the miscellaneous debris that
hasn’t been ushed out into the ush cart.
Once the enre system has been ushed and lled, the
anfreeze 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.
Take mulple readings, and check the anfreeze percentage, as
the system is being mixed. The nal step is to go through the set
up wizard on the controller (HMI) to energize the diverng valve
(if equipped) and verify that the last bit of air is removed from
the system. . Once
completed, the ush cart can be removed from the system.
If any small amount of air is sll in the system, the air
eliminaon device will remove it and the make-up water, as well
as the expansion tank, will keep pressure on the system.
Recommended pressure seng is 12-17 PSI cold = 15-19 PSI hot.
The enre system is now ushed, lled, treated, and ready to be
put into operaon.
Enertech recommends that all hydronic systems water be tested
prior to being used in any installaon.
Water quality is important for the Load side of the system. Due
to use of dissimilar metals throughout the system (i.e. stainless
braze plates, cast iron pump volutes, etc.) certain minerals or
chemicals may build up and become detrimental to system
operaon and longevity. Filling the system with good quality
water that meets the specicaons outlined in
The quality of the water used in hydronic systems is very
important. In closed loop systems the diluon water (water
mixed with anfreeze) must be of high quality to ensure
adequate corrosion protecon. Water of poor quality contains
ions that make the uid “hard” and corrosive. Calcium and
magnesium hardness ions build up as scale on the walls of the
system and reduce heat transfer. These ions may also react
with the corrosion inhibitors in glycol based heat transfer uids,
causing them to precipitate out of the soluon and rendering
the inhibitors ineecve in protecng against corrosion. In
addion, high concentraons of corrosive ions, such as chloride
and sulfate, will eat through any protecve layer that the
corrosion inhibitors form on the walls of the system.
Ideally, de-ionized water should be used for diluon with
anfreeze soluons since de-ionizing removes both corrosive
and hardness ions. Dislled water and zeolite soened water are
also acceptable. Soened water, although free of hardness ions,
may actually have increased concentraons of corrosive ions
and, therefore, its quality must be monitored. The Department
of Natural Resources or your local municipality can direct you to
the proper tesng agency. Please see for guidelines.
Also, once the system has been ushed and lled, Enertech
recommends the use of Fernox F1 (Enertech P/N: F-57880)
water treatment products in order to keep the system clean and
running smooth for years to come.
Second, open the isolaon valves and ush/ ll the hot water
tank (if equipped), making sure to keep the system pressure
below 30 PSI. If the pressure gets above 30 PSI, the relief valve
on the tank will purge water. Once this step is complete, close
the isolaon valves.
This step can be skipped if the unit is not equipped with
hot water capability.
⚠⚠
⚠⚠
⚠⚠
To Next Page
Loading...
