Enertech Global
EAV - EME/EMD Rev. A Models
Installaon and Operaons Manual
System should include a variable speed (Delta-T
or Delta-P control) or constant speed pump to provide ow
from the hydraulic separator to the hydronic zones. A pressure
dierenal bypass valve must be installed to avoid dead heading
the pump if zone valves are not fully open.
A strainer is included in the Indoor Module. It must be
checked and cleaned as necessary to ensure proper ow rate
and long-term unit reliability.
All necessary unions, adapters
and ngs should be installed to allow ease of service and to
meet any local code requirements.
The Systems Accessories Table (Secon 6) includes a reference
when ordering a new system to determine which items
are included with the unit, which items must be purchased
separately, and which items must be purchased locally from a
plumbing wholesaler.
Secon 6 provides guidelines for pump mounng, ow rate
requirements, pipe sizing, and ushing/purging the system.
Secon 8 has control opons that work with the piping diagrams
in Secon 6 (see “Wiring Diagram Selecon Chart” for control
selecon). Enertech strongly recommends using an approved
zone control (Hydro-Connect or EWC) to provide the most
compable operaon with the Indoor Module. Although other
control systems will work, Enertech Technical Services personnel
are most familiar with the approved controls. Other controls may
be dicult to support should troubleshoong be needed.
According to the Water Research Foundaon, the average
American shower uses approximately 15.8 gallons and lasts for
7.8 minutes at an average ow rate of 2.1 gpm. Depending upon
local regulaons, shower heads may be available with 1.8, 2.0,
or 2.5 gpm ow rates. The state of California, for example limits
the ow rate to 1.8 gpm, as of July 2018. In some cases ow
restrictors can be removed/modied or mulple shower heads
may allow signicantly more water usage.
Following are some consideraons when determining indirect
water heater choice, as well as the need for a second water
heater:
The EAV unit has much higher capacity than a
standard electric or gas water heater, although the indirect water
heater storage is for “load water”, not potable water. Therefore,
the Turbomax indirect water heater operates more like an
instantaneous water heater than a standard water heater. Based
upon Enertech lab tesng, draws of 5 gpm for a sustained period
from the water heater will cause the supply temperature at the
xture to drop.
In a typical residenal applicaon, a second water
heater is not necessary for capacity reasons. In large usage
applicaons (spa tubs and mul-head showers), a second
water heater is necessary to meet the hot water needs of the
customer. A gas or electric water heater can be added to the
system to cover these needs. A review of the required gpm and
gallons of hot water will be required to size the tank. Keep in
mind that mulple shower heads could legally use as much as 10
gpm.
A second water heater will provide some
redundancy to the system if there is a pump failure in the heat
pump or some other issue not allowing the heat pump to run.
In addion, during defrost, the unit will not be generang hot
water.
Based upon the consideraons
above, Enertech recommends a second water heater for all
EAV installaons. It is a relavely inexpensive addion that
provides many advantages.
Tank selecon is based upon the number of bathrooms (types
of showers and tubs), dishwashers, washing machines, and
number of people in the home. Enertech oers two selecons,
a 45 gallon indirect tank and a 65 gallon indirect tank. Typically,
a 45 gallon tank will handle two bathrooms with water ecient
xtures, one dishwasher, and one automac clothes washer. A
65 gallon tank will handle 3-1/2 bathrooms with water ecient
xtures, one dishwasher, and one automac clothes washer. If
the home has been idened as a large usage applicaon (see
“Large Usage”, above), a second water heater in series with the
Turbomax indirect water heater is required. Even applicaons
that are not “Large Usage” will benet from a backup water
heater for mes when the outdoor temperature is very cold,
during defrost cycle, or for emergency use.
The EME model Indoor Module has an internal 9kW immersion
heater that can be used for supplemenng the heat pump
capacity for hydronic heang and/or DHW heang. Depending
upon the applicaon, either the internal heater or external
backup may make more sense. If addional heang capacity is
needed, a determinaon should be made based upon type of
heang required. For example, in most cases, a backup electric
heater is installed in the fan coil. Since the fan coil is required
for cooling anyway, it can be used for backup or for emergency
heat. For DHW, a second water heater can provide both backup
heang capacity and emergency DHW heang. The advantage
of the internal electric heat is that duct heaters and second
water heaters are not needed. However, if a pump fails, the
internal electric heat cannot operate. Each applicaon must be
evaluated individually to ensure that the type of backup ts the
requirements. Installaon diagrams in this IOM show the typical
connecons used for addional heang back up sources or dual
fuel applicaons. Enertech recommends a second water heater
and electric heat in the fan coil, ulizing the internal electric heat
as oponal.
The EMD model Indoor Module has connecons for an external
boiler that can be used for supplemenng the heat pump
capacity for hydronic heang and/or DHW heang. For DHW,
a second water heater or a combi boiler can provide both
backup heang capacity and emergency DHW heang. Enertech
recommends a second water heater (or combi boiler) and
electric heat in the fan coil.
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