American Dream Ultra Performance Geothermal Copper Series, Installation And Service Manual

Page: 15 / 60

25 MAY 2009 Page 15 000744MAN-02
The total number of supply grills available is based on the
heat pump nominal airflow. TABLE 13 shows the number of
grills available per heat pump size.
Return grills should be mounted on the floor. At minimum
they should be the same size as the supply grill, it is highly
recommended that they be 25% to 50% larger than the total
supply.
They should be placed opposite the supply grills when
possible to ensure distribution across the room. For rooms re-
quiring more than one supply grill, it may be possible to use one
larger return grill if it can be centrally positioned opposite of the
supply grills, however it is preferred to have one return for each
supply to maximize heat distribution across the room.
THERMOSTAT LOCATION
Most homes are a single zone with one thermostat. The ther-
mostat should be centrally located within the home, typically on
the main floor. It should be placed away from any supply grills,
and should not be positioned directly above a return grill. Most
installations have the thermostat located in a hallway, or in the
inner wall of the living room. It should be noted that most
homes do not have any supply ducts in the hallway. This can
lead to a temperature lag at the thermostat if there is very little
air movement in the hallway, causing the home to be warmer
than indicated by the thermostat.
PLENUM HEATER (OPTIONAL)
For installations that do not already have a backup heat
source such as electric baseboard, wood stove, propane etc, it
is recommended that a plenum heater be installed. This pro-
vides two functions.
The first function of the plenum heater is to act as an auxiliary
heat source. As such it will provide additional heat on extremely
cold days if the heat pump is unable to bring the home tempera-
ture up quickly enough, eliminating any discomfort to the home-
owner.
The second function of the plenum heater is to provide emer-
gency heat should a problem occur that causes the heat pump
to be locked out. This can be engaged by setting the thermostat
to emergency heat, allowing the plenum heater to function while
preventing the heat pump from operating. Should the heat
pump fail while the home is vacant, the auxiliary function of the
thermostat will maintain the temperature setting of the thermo-
stat.
The plenum heater is powered separately from the heat
pump. Only two control wires are needed to connect the ple-
num heater to the heat pump. Refer to the label on the plenum
heater or the electrical box diagram on the inside of the electri-
cal box cover of the unit for details on the connections.
The plenum heater should be mounted in the supply duct in a
manner that allows all of the airflow to pass through it to prevent
any hot spots in the heater elements.
TABLE 14 shows the recommended size plenum heater, as
well as the wire size and breaker size needed to provide power
to the plenum heater.
CONDENSATE DRAIN
The unit comes equipped with a 3/4” PVC socket fitting
(female) labeled “Condensate Drain”. This drain allows the con-
densate which forms during the air-conditioning cycle to be re-
moved from the unit. The drain should be connected as per
local codes. During high humidity weather, there could be as
much as 25 gallons of water formed per day.
Care should be taken in the spring to ensure that this pipe is
not plugged with dust that has collected during the winter caus-
ing the condensate to overflow into the bottom of the heat pump
and onto the floor.
The condensate drain is internally
trapped; however, proper venting is required external to
the heat pump. Refer to local codes to ensure the installa-
tion is done properly.
Drawing 000606CDG shows a typical
installation.
HYDRONIC SYSTEMS - GENERAL
The most common applications for the hydronic heating are:
(see drawing 000530PDG for typical zone types)

radiant in-floor heating

On-demand domestic hot water

Swimming pool or spa
The radiant in-floor areas of the home may be sectioned into
several areas called zones. Each zone has its own thermostat,
allowing simple separate temperature control of the individual
areas in the home. A typical system consists of the heat pump,
the buffer tank and the zones. The sole purpose of the heat
pump is to maintain the buffer tank set point. Its operation is
independent of the zone operation.
HYDRONIC SYSTEM CONNECTIONS
The unit has 1” copper pipe connections for the hydronic sys-
tem, labeled INDOOR IN and INDOOR OUT. Flow through the
unit is provided by an external circulator powered by the control
box.
NOTE: Depending on how the system is connected, an ex-
ternal water valve may be required in the INDOOR OUT line
to prevent draw through the water coil while in air heating
mode. The 24VAC coil of the water valve can be connected
across Y1A and CA in the heat pump.
Drawing 000533PDG
shows a typical piping configuration for
a single unit with a buffer tank. This is a guideline for a simple
installation. There are many other configurations, such as, mul-
tiple units connected to one buffer tank, on-demand domestic
only, etc… It is recommended that the hydronic system be de-
signed by a qualified system designer to ensure proper function-
ality.
Drawing 000627PDG shows two typical on-demand domestic
hot water systems, dedicated and zoned. For a dedicated
setup, there are no zones and the home is heated solely by air.
The unit can very easily be switched between air or hydronic
priority during installation.
TABLE 14 - Plenum Heater Sizing
Heat
Pump
Plenum Heater (230-1-60)
Size
(Tons)
Size
(kW)
Current
(A)
Breaker
(A)
Wire
Size
2 6 28 40 #6
3 10 42 60 #6
4 15 62 100 #3
5 20 84 125 #3