Enertech Global
EAV - EME/EMD Rev. A Models
Installaon and Operaons Manual
Flow Sensors installed in this equipment are extremely
sensive to micro-bubbles.
• Enertech recommends “Home Run” style piping (see
) to help facilitate air removal, but also for ease of access
to the zone valves. In the “Branch” style piping in
, branches 2 and 3 can be parcularly dicult to purge,
depending upon the size of the supply/return lines feeding
the two branches, especially if fan coils are piped in this
manner.
• In , there could be two
dierent ow rates on each side of the hydraulic separator,
depending upon the size and number of zones and the size
of the heat pump. Supply/return lines for the heat pump
size of the hydraulic separator must be sized for the heat
pump ow rate; supply/return lines on the system pump
side of the hydraulic separator must be sized based upon
the number and size of connected zones.
• Any hydronic system with
parallel piping to various zones requires large enough piping
diameter to provide sucient ow to all zone, but also to
assist in purging air from the system. The ow rate though
the supply/return lines must be high enough to achieve 2
feet per second velocity in all of the parallel branches.
“Home Run” style piping, as menoned above, is helpful in
purging air, as well.
• Selecng Pipe diameter from Table 2
for supply/return lines will help ensure low pressure drop
and good performance.
The example below provides steps for sizing the piping for a
typical residenal system.
System includes a model 060 heat pump with one 3 ton fan coil
and 3 radiant zones. Two radiant zones each have 5 circuits and
one radiant zone has 3 circuits (13 total circuits). All circuits are
1/2” PEX piping.
The radiant heang calculaons determined that the PEX loops
will be at 9” O.C. spacing and that the ow rate per circuit will be
0.42 GPM (5.5 GPM total). Since the fan coil is larger than 2 tons,
a buer tank is not needed (the system will use a hydraulic
separator). The system will use 25% Fernox Alphi-11 propylene
glycol anfreeze. The following steps should be used to
determine pipe sizing:
1. Determine ow rate and pipe diameter for piping from
hydraulic separator to the “Home Run” hydronic zones (see
items 2 & 3 in ). From Table 1, the fan coil needs 9
GPM. Also from Table 1 the 1/2” radiant tubing could be up
to 0.75 GPM per circuit, but since 0.42 GPM was specied,
the applicaon will use the specied ow rate (13 x 0.42 =
5.5 GPM). Total ow rate is 14.5 GPM (9 + 5.5). From Table
2, the supply/return lines from the hydraulic separator to
the zones should be 1-1/4” copper or 1-1/2” PEX.
2. Similar calculaons should be done for each zone. For the
fan coil zone (9 GPM), 1” copper or 1-1/4” PEX should be
run to the fan coil; for the 5 circuit manifold, 3/4” PEX may
be used (same for the 3 circuit manifold).
Heat Pump
EAV040 – 12 GPM
EAV060 – 15 GPM
MPH Fan Coils/Air Handlers & ACH/MCH A-Coils
MPH/ACH/MCH024 – 6 GPM
MPH/ACH/MCH036 – 9 GPM
MPH/ACH/MCH048 – 13 GPM
MPH/ACH/MCH060 – 13 GPM
Mul-Aqua Fan Coils
High-wall units Console Units
MHQWW-9 – 3 GPM CFFWA-3 – 3 GPM
MHQWW-12 – 6 GPM CFFWA-6 – 4.5 GPM
MHQWW-18 – 6 GPM CFFWA-8 – 5.5 GPM
MHQWW-24 – 7 GPM CFFWA-12 – 8 GPM
MHQWW-36 – 10 GPM CFFWA-16 – 10.5 GPM
CFFWA-20 – 12.5 GPM
Radiant Floor
1/2" PEX – 0.5 to 0.75 GPM per circuit
5/8" PEX – 0.75 to 1 GPM per circuit
3/4" PEX - 1 to 1.25 GPM per circuit
Example: A 5 loop manifold with 1/2” PEX circuits would need
supply/return piping capable of supplying 2.5 to 3.75 GPM
DHW Piping
Use ow rate for heat pump
Pipe Diameter/Type
Maximum Flow Rate (GPM)
Floor Loop* Supply/Return**
1/2” PEX 0.75
N/A
5/8” PEX 1
3/4” PEX 1.25 4
3/4” Copper or 1” PEX
N/A
7
1” Copper pr 1-1/4” PEX 12
1-1/4” Copper or 1-1/2” PEX 17
1-1/2” Copper 25
2” Copper 45
* Based upon 300 . circuits.
**Based upon 25. length (one-way) and 4 elbows with water.
When using anfreeze, increase pipe size to the next size if
close to the maximum ow rate.
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