American Dream Ultra Performance Geothermal Copper Series, Инструкция по установке и обслуживанию

Страница: 7 / 60

25 MAY 2009 Page 7 000744MAN-02
TABLE 3 shows typical settings for the aquastat. The
settings may be changed as desired; however, the setpoint
should not exceed 120°F (49°C) ; Exceeding this setpoint limit
will cause the heat pump operating pressures to approach the
safety control settings, possibly causing nuisance shut downs.
If only floor zones are being heated, it is highly rec-
ommended to drop each of the setpoints by 15°F (8°C) for
increased efficiency.
It is recommended that a buffer tank with electric elements
be selected to provide auxiliary / backup heat. The tank ele-
ment thermostats can be set to a low value of around 60°F
(15°C) which will prevent the hydronic system from becoming
too cold should there be a failure in the heating system.
Drawing 000344CDG shows how a typical zone system
would be setup with the FCTF unit. The zone controls and heat
pump operate independently, there are no connections between
the two systems.
TWO STAGE CONTROL BOX
The Two Stage Control Box is the interface between the
controls (thermostat and aquastat) and the heat pump. It’s main
function is to provide the signal manipulation required to operate
the fan or the Indoor Loop Circulator as required based on the
signals received from the controls. It also contains a contactor
for power connections to the Indoor Loop Circulator.
The connections between the control box and the heat
pump are shown in TABLE 4 . Three documents are shipped
with the Control Box: 000739SCH, 000740CDG and
000741INF . They contain all the information required to com-
plete the Two Stage Control Box connections, as well as infor-
mation on how the control box operates.
AIR FLOW REDUCTION AND
PLENUM HEATER CONNECTIONS
TABLE 5 lists the remaining four terminals on the heat
pump terminal strip. These signals are separate from the Con-
trol Box. The AR
1
and AR
2
terminals are the airflow reduction
signal. See the FAN MOTOR section for more information on
therm. The I and 1 terminals are the dry contacts for the plenum
heater. Connect these to the C and 1 terminals of the plenum
heater. Refer to the electrical box diagram (ELB) of the heat
pump or the diagram on the cover of the plenum heater for more
information.
NOTE: Some models are not available in two-stage at the pre-
sent time (see Electrical Tables ). The Y2 signal is not used for
these units
INDOOR LOOP CIRCULATOR WIRING
The Indoor Loop circulator provides flow between the heat
pump and the buffer tank. The Two Stage Control Box has pro-
visions for connecting the Indoor Circulator so that it will be
turned on whenever the heat pump is in water heat mode and
the compressor operates. Connect line voltage (115 or
230VAC) to the terminals marked L1 and L2 of the Indoor Circu-
lator Contactor. Connect the Indoor Loop circulator to the termi-
nals marked P1 and P2. Ensure that the line voltage and circu-
lator voltage rating are the same.
FAN MOTOR
The unit is equipped with a direct drive ECM fan motor for
maximum efficiency. The motor features a soft start which fur-
ther improves efficiency by eliminating inrush current and pro-
vides a smooth, quiet ramp up to speed . The motor will main-
tain the programmed air flow up to the maximum external static
value. Refer to the APPENDIX A: ECM Fan Airflow Tables.
The air flow can be set to four different levels by changing
the position on the Air Flow board located in the electrical box.
The four levels are indicated in
TABLE 6 . The actual air flow
TABLE 6 - Airflow Selections
Position Airflow
LOW -12%
MED -6%
HIGH Nominal
MAX +6%
TABLE 4 -
FCTF Two Stage Control Box to Heat
Pump Signals
Signal Description
C 24VAC Common (Ground)
G Fan low speed (for air circulation)
Y
1
Heat Pump Stage 1 (Compressor stage 1)
R
H
24VAC Hot
L Fault (24VAC when fault condition)
W
2
Heat Pump Stage 3 (auxiliary heat) / Emergency
Heat
O/B/W
1
Cooling Mode (reversing valve)
Y
2
Heat Pump Stage 2 (Compressor stage 2
E1 Fan Auxiliary/Emergency Speed Control (In)
E2 Fan Auxiliary/Emergency Speed Control (Out)
FC Fan Contactor
TABLE 5 - Remaining Signal Descriptions
Signal Description
AR
1
Airflow Reduction*
AR
2
Airflow Reduction*
I Plenum Heater dry contact
1 Plenum Heater dry contact
* Connect AR
1
to AR
2
with a dry contact to reduce the airflow
by 15%. Refer to the Fan Motor sub-section for more infor-
mation.
TABLE 3 - Typical Aquastat Settings
Stage 1** Stage 2**
Item ° F ° C °F °C
Setpoint 115 46 105 41
Delta 5 3 5 3
Activation * 110 43 100 38
*Activation is indirectly set by the Setpoint and Delta values
** All values must be set identical for both stages