Enertech Global, LLC
7
WS Rev. E Models
Installation and Operations Manual
Loop Pumping Modules
Must be wired to the heat pump’s electric control box. A
pump module connection block, connected to the master
contactor, and circuit breaker is provided to connect the
Pump Module wiring.
Desuperheater Package
Water heating is standard on all residential units (units may
be ordered without). It uses excess heat during both heating
and cooling cycles, to provide hot water for domestic needs.
A double wall desuperheater exchanger (coil) located
between the compressor and the reversing valve, extracts
superheated vapor to heat domestic water; still satisfying its
heating and cooling needs. The water circulation pump comes
pre-mounted in all residential units, but must be electrically
connected to the master contactor. Leaving it disconnected
ensures that the pump will not run without a water supply.
The Desuperheater package can make up to 60% (depending
on heat pump usage) of most domestic water needs, but a
water heater is still recommended.
Desuperheater Piping
All copper tubes & fittings should be 5/8” O.D (1/2” nom)
minimum with a maximum of 50ft separation. Piping should
be insulated with 3/8” wall closed cell insulation.
Note: Copper is the only approved material for piping the
desuperheater.
Unit Placement
When installing a geothermal heating and cooling unit, there
are items the installer should consider before placing the
equipment.
1.
Service Access. Is there enough space for service access?
A general rule of thumb is at least 2 feet in the front and
2 feet on at least one side.
2.
Unit Air Pad. All geothermal heating and cooling
equipment should be placed on either a formed plastic
air pad, or a high density, closed cell polystyrene pad.
This helps eliminate vibration noise that could be
transmitted through the floor
3.
Unit Racking: If units are being placed on racking, the unit
must be placed on a solid foundation covering the full
base of the unit. Also, utilize a foam pad between the
unit and the rack.
4.
The installer must verify that all applicable wiring, piping,
and accessories are correct and on the job site.
Pre-Installation
Before you fully install the geothermal equipment, it is
recommended you do the following:
•
Fully inspect the unit after unpacking.
•
Locate the Unit Start-Up form from this manual and have
it available as the unit installation proceeds.
Buffer Tanks
Virtually all water-to-water heat pumps used for hydronic
applications require a buffer tank to prevent equipment short
cycling, and to allow lower flow rates through the water-to-
water unit than through the hydronic delivery system. The
following are considerations for buffer tank sizing.
•
The size of the buffer tank should be determined based
upon the predominant use of the water-to-water
equipment (heating or cooling).
•
The size of the buffer tank is based upon the lowest
operating stage of the equipment. For example, a
water-to-water heat pump with a two-stage compressor
or two compressors may be sized for first stage capacity,
reducing the size of the tank (two-stage aquastat
required
•
Pressurized buffer tanks are sized differently than
non-pressurized tanks (see guidelines listed below).
Pressurized buffer tanks for predominately heating
applications should be sized at one (1) U.S. gallon per 1,000
Btuh of heating capacity (10 gallons per ton may also be used)
at the maximum entering source water temperature (EST)
and the minimum entering load water temperature (ELT), the
point at which the water-to-water unit has the highest
heating capacity, usually 50-70°F EST and 80-90°F ELT.
For predominately cooling applications, pressurized buffer
tanks should be sized at one (1) U.S. gallon per 1,000 Btuh of
cooling capacity (10 U.S. gallons per ton may also be used) at
the minimum EST and the maximum ELT, the point at which
the water-to-water unit has the highest cooling capacity,
usually 50-70°F EST and 50-60°F ELT.
Select the size of the tank based upon the larger of the
calculations (heating or cooling).
Non-pressurized buffer tanks must also be sized based upon
predominate use (heating or cooling) and based upon the
lowest capacity stage. Requirements for storage are less
according to the manufacturer of the HSS series non-
pressurized buffer tank. Using the same conditions for
maximum heating and cooling capacity mentioned above,
non-pressurized buffer tanks require 6 U.S. gallons per ton.
Section 3: Installation Considerations