Transcript CELLARTEC_basics.pps

Wine Cellar
Split System Basics
Definitions

Split System
–

Condenser
–

A cooling unit that “splits” the cooling coil and the condenser apart into two
remote pieces.
The outdoor half of a split system, this is where the hot freon gas is cooled
back to into a liquid form and sent back to the cooling coil to absorb heat
from the cellar. As the freon absorbs heat it changes state into a gas and
returns to the condenser to discharge the heat gain into the ambient air.
Cooling coil
–
The cooling coil is a freon cooled heat exchanger that air is drawn or
pushed through to extract heat from the cellar. This could be mounted
directly inside the room as a fan coil unit or mounted remotely as a ducted
airhandler.
Definitions

FCU (Fan Coil Unit) – A surface mount cooling coil that mounts
inside, typically on the ceiling of the cellar. Best for retro fit
installations or cellars without adjacent spaces for a ducted
airhandler.

Ducted Airhandler- Unit that contains the cooling coil outside
the cellar, allowing for a supply and return duct to be run to and
from the cellar. Best choice for applications appearance and
low noise are critical. Requires a space adjacent to the cellar to
locate the unit and insulated duct work for supply and return air.
Note: Mounting outside the cellar in warmer air and the load
from the length of the ductwork will increase the size of your
system.
Definitions

Supply Air- The air from the cellar that has been cooled by the
cooling coil and is being supplied to the cellar.

Return Air- The warm air returning to the cooling coil to have
the heat removed. Once through the coil it becomes supply air.
Definitions

Lineset
–

The two copper refrigeration pipes that run between the two pieces
of a split system. One side carries the freon in a gas state and the
other handles freon in a liquid state. They are normally bundled
together and insulated. The two lines are are always slightly
different sizes as the freon takes up more volume in a gas state.
Condensate
–
The water byproduct caused by the temperature difference of the
warm air crossing the cooling coil. This normally collects on the
surface of the coil “fins” and then drips down into a collection pan
to be drained away. As a result every fan coil or airhandler must
gravity drain into a drain or a condensate pump.
Definitions

Condensate Pump
–
Small pump mounted on top of a small reservoir,
the pump is triggered by a float switch to empty
the reservoir at a certain fill level. These pumps
have a maximum lift rating called total equivalent
head that determines their ability to push water
upwards. If you exceed that rating the water will
fall back down and flood the reservoir.
Definitions

Total Head Pump Rating
–
The maximum distance the condensate pump can push water up from
the source and still hold up the weight of the water. The closer you get
to reaching the maximum rating the lower the output of the pump will
be. At the point of total head the pumps output will be zero as it can
only hold the weight of the water at that distance. Note: That 90
degree bends, reductions in size, valves or long horizontal runs will
reduce the output rating.
Definitions

PLC
–
Programmable Logic Control. This is the type of
control we use in our split systems. Normally you
find this type of control in large buildings or in
building automation. We use this type of control
because we can program it to react to the array of
sensors we put in the cooling system to provide
the best cellar control possible.
Definitions

BTU
–

BTUH
–

The number of BTU’s that a system can handle per hour
Heat load
–

British Thermal Unit, a standard measurement of heat
The total amount of heat gained inside the cellar that will
infiltrate in through the walls, door or glass surfaces. This is
expressed in terms of BTU.
Load calculation
–
A process in which the heat load, air volume, infiltration,
surrounding temperatures, ambient exterior temperature are
factored together to arrive at a cooling system size.
Key Terms





Line voltage- 110volt (wall plug), 208 or 220/240volt single phase 60hz
Low voltage- 24volt control wiring, small wiring used to send control
impulses or sensor readings
R-134A- The type of freon we use, it is the latest product and most
environmentally friendly
Equipment pad- Small concrete platform for the outdoor (condensing)
unit to sit on, or it can be bought pre-made from synthetic material
Service disconnect- Method of disabling the power supply to the units
for service. Can be a box with a switch, a service lock out or simply a
plug to unplug (preferred method for ease of rough in and installation).
This must be mounted in view of the equipment such that a service
person can see the status of the power to the unit while working on it.
Key Terms





Delta T- Difference or change in temperature. Example: Delta T
between the hallway and the wine cellar might be 25 degrees F
Set Point- The selected temperature targeted for the cellar,
cycles the unit off at this point.
Cooling band- The range above the set point which triggers the
unit to cycle on.
TXV (TEV)- Thermal Expansion Valve which is installed in the
cooling system to actively meter the flow of freon to the cooling
coil depending on conditions.
EPR – Evaporator Pressure Regulation. Regulates the low
pressure at the cooling coil, can be used to change the delta T
at the coil.
Contact Information
Local branch offices can be found at: www.apexwinecellars.com