INSTALLATION INSTRUCTIONS
R
−
410A Split System Heat Pumps
8
428 01 1703 01
Specifications subject to change without notice.
Replace stem caps after system is opened to
refrigerant flow. Replace caps finger
−
tight and tighten
with wrench an additional 1/12 turn
3. Close electrical disconnects to energize system.
4. Set room thermostat or Observer Wall Control at
desired temperature. Be sure set point is below indoor
ambient temperature.
5. Set room thermostat to HEAT or COOL and fan control
to ON or AUTO mode, as desired. Operate unit for 15
minutes. Check system refrigerant charge.
Figure 10
Observer Communicating Wall Control
Four
−
Wire Connection Diagram
S1
S2
R
C
DX
−
DX+
Optional Remote
Room Sensor
HUM
COM
C
DX
−
DX+
Humidifier
Connection
Green
Yellow
White
Red
R
Green
Yellow
C
DX
−
DX+
Observer
Communicating
Wall Control
Communicating
Variable Speed
Furnace/Fan Coil
Two-Stage
Heat Pump
NOTE
: Wiring must conform to NEC or local codes.
NOTE
: For standard thermidistat or thermostat wiring, see
Installation Instructions for those products.
Figure 11
FVM Fan Coil Wiring With
Two
−
Stage Heat Pump
Fan Coil
Indoor Control
G
O/W2
R
Y1/W2
W/W1
Y/Y2
DHUM
C
HUM
B
S1
S2
RVS Cooling
Heat/Cool
Stage 1
Heat Stage 3
Heat/Cool
Stage 2
Fan
24 VAC Hot
Dehumidify
24 VAC Comm
Humidify
RVS Heating
Outdoor
G
O
R
W1
Y/Y2
C
Y1
W2
H
O
Y1
Y2
C
W1
Two-Stage Heat Pump
Remove J2 Jumper
For Heat Staging
s
s
Humidifier
(24 VAC)
Outdoor
Sensor
Figure 12
Variable Speed Furnace with
Two
−
Stage Heat Pump (Dual Fuel)
Variable Speed
Furnace
ICP Thermostat
G
W2
R
Y1
W1
Y2
C
DHUM
OD
GND
H
Y1
Y2
C
W1
Two-Stage
Heat Pump
G
W2
R
Y1
W/W1
Y/Y2
COM
HUM
L
O/B
OUTDOOR
SENSOR
O
Figure 13
Non
−
Communicating Indoor Unit with
Observer Communicating Wall Control
NAXA00101DB
Green
Yellow
White
Red
OAT
Sensor
Communicating
Outdoor
W2
C
Y1
W1
C
R
Wall
Control
OAT
DX+
R
C
DX-
Y1
G
O
O
C
Y1
R
W2
G
DX+
R
C
DX-
Non-Communicating
Indoor
Note: This installation requires the daugh
ter board accessory, NAXA00101DB.
Note: This installation does not allow for
communicating feature functionality.
Y2
Y2
Y/Y2
Check Charge
Two
−
stage equipment should be charged in high
−
stage
compressor operation only.
Factory charge amount and desired subcooling are shown
on unit rating plate. Charging method is shown on information
plate inside unit. To properly check or adjust charge,
conditions must be favorable for subcooling charging.
Favorable conditions exist when the outdoor temperature is
between 70
F and 100
F (21.11
C and 37.78
C), and the
indoor temperature is between 70
F and 80
F (21.11
C and
26.67
C). Follow the procedure below:
