Enertech Global
39
EAV - EME/EMD Rev. A Models
Installation and Operations Manual
Pump Mounting
It is important to follow best practices for mounting the system
pump to provide long life, serviceability, and the ability to purge
air out of the system. Following are two important tips for
ensuring a good installation:
•
Pumping Direction:
Pumping up is the best way to mount
the pump. If there is air in the system, it will have the best
chance of the air getting though the pump, to the air
separator, and out of the system. If the pump air locks, turn
the pump off and the air will go up out of the impeller and
will be replaced with water. Restart the pump and it will
start pumping. The air will flow to the air separator. In most
cases the air will go through the pump. Pumping
horizontally will work as long as there are small pockets of
air in the system. They will keep moving around the system
with the water to the air separator. If there are big pockets
of air in the system, this will create problems for horizontal
mounting. The pump will cavitate, lose water flow,
overheat, and fail. If the pump does get air locked, there will
need to be a purge port so that the air can be flushed out of
the pump and system. Pumping down is the poorest way to
mount a pump. If there is air in the system it will get
trapped in the pump, causing it to cavitate, loose water
flow, overheat, and fail. The air creates resistance in the
down flowing water because the air wants to flow up. If the
pumps loses flow or stops, the air comes back up the pipe
into the impeller, amplifying the problem. If the pump gets
air locked, there will need to be a purge port so that the air
can be flushed out of the pump and system.
•
Motor/Electrical Box:
The pump is a wet rotor pump. The
motor shaft must be horizontal to keep the bearings
properly lubricated. Do not put the pump on its back or
pointing down (vertical shaft) because this orientation can
cause premature pump failure. In most cases, the direction
of the electrical box is important to keep any condensation
out of the windings. Some pumps have a yellow sticker that
is on the head of the pump, indicating the proper direction.
Piping diagrams in
Figures 12a to 12d
are schematics. Not all
components are shown, such as union fittings, piping adapters/
reducers, and other components. Schematics are designed for
illustrating the arrangement/function of the components.
Always use best practices when considering the location of the
various components. For example, the expansion tank must
always be on the suction side of the pump; check valves (if
applicable) must always be on discharge of the pump.
Flow Rates and Piping Sizing
Figures 12a to 12d
are schematic drawings. Successful design of
the system must also include pipe diameter and layout. The
following guidelines should be considered for all hydronic
designs:
•
“Home Run” Style Piping:
Purging air from the system is
one of biggest challenges for hydronic systems.
Description
Order with New
Unit?
Enertech Part #
Notes
Automatic Air Vent, Taco
Y
03P017-01BN
Install at highest point in system
Boiler Trim Kit
Y
See Notes
Expansion tank, air separator, automatic air vent included;
press. reduc. vlv./backflow preventer to be sourced locally.
1" Taco Geo-Sentry Zone Valve
Y
ATEBV5C
One per radiant manifold and one per fan coil
Turbomax indirect water
heater
Y
See Notes
Must be ordered with unit as part of unit as 45 or 65 gallon
tank
Brass 3-way valve in cabinet
Y
03P016001BN
Two are included with unit. Two more should be ordered for
hydronic piping.
Double O-ring x 1" FPT (pair)
Y
AGA5FPT
Two sets should be ordered for external flush valves.
Boiler drain valve
Included
11080003001
Part of plumbing kit
Strainer
Included
08P020-01NN
Internal to Indoor Module
System Pump
Y
See Notes
AGSIPV3A (UPS26-115V const. spd. insul. cabinet w/isol.
vlvs.) OR: AGSIPV7A (UPM-XL var. spd. 230V insulated
cabinet w/isol. vlvs.) + AGFCVSC2A controller)
Hydraulic Separator
Y
ATHS6A
Taco copper separator, 1-1/4” sweat w/mounting brackets,
auto air vent, and blow-down valve
Differential bypass valve
Y
ADBV4A
Use on hydronic side of hydraulic separator
Air Handler(s)
Y
See Notes
Review Enertech price books for MPH Series air handers
Radiant Tubing/Accessories
Y
See Notes
Review Enertech price books for Infloor products
Optional elect. or gas wtr htr
Y
N/A
Supplied by contractor
Pressure Relief Valve
Included
N/A
Included with indirect water heater
Ball Valves
Y
N/A
Supplied by contractor
Unions, adapters, misc. fittings
Y
N/A
Supplied by contractor
Pressure gauge
N/A
N/A
Included with indirect water heater
System Accessories Selection Table
Section 6: Unit Piping Installation
