035-14520-001 Rev. B (0803)
8
Unitary Products Group
1.
Suction line connections are made outside the center
access panel. Cut off the suction line as close to the end
as possible. Center access panel is recessed to assure
sufficient room for brazing or it can be removed and slid
over the suction line during brazing.
2.
Braze the suction line. Re-attach the center access
panel, if it had been removed.
3.
Cut the liquid line at the groove in the bell, removing the
schrader fitting.
4.
Braze the liquid line.
5.
Install supplied grommets on both the suction and liquid
lines to complete the air seal.
Lines should be sound isolated by using the appropriate
hangers or strapping.
When field supplied lines are used be sure to insulate the
suction line only.
ELECTRIC HEATERS & OPERATING CONTROLS
The low voltage transformer and the fan / heater control are
standard on all models. The air handlers are shipped
prewired to operate as cooling only applications. To complete
the installation for cooling only, install a 6-pin jumper plug to
the control board to bypass the heater limit controls.
This
jumper plug can be found in the unit installation enve-
lope or secured to the center of the heater duct cover
flange, near the transformer.
Failure to install the plug will
cause the blower to run continuously. See Figure 12. Mark
the unit nameplate with the appropriate heater selection on
the space provided or NONE to indicate cooling only.
To operate these units with electric heat, it is necessary to
field install an electric heater kit (2HK). See Electric Heater
Accessory Installation instructions for proper installation pro-
cedure. Prior to installing electric heat, it is necessary to per-
form the following procedure:
1.
Remove the 4-pin power plug from the control board.
See Figure 12.
NOTE:
This pin must not be used when electric heaters are
installed.
2.
Remove the five (5) screws from the duct cover and
remove the duct cover from the air handler.
For units with heaters with circuit breakers in a horizontal
right application, a label must be applied to the unit to
describe the circuit breaker orientation. The label is included
on the installation instruction packet. See Figure 10.
LOW VOLTAGE CONTROL CONNECTION
The 24 volt power supply is provided by an internally wired
low voltage transformer which is standard on all models.
However, if the unit is connected to a 208 volt power supply
the low voltage transformer must be rewired to the 208 volt
tap. See the unit wiring label.
Field supplied low voltage wiring can exit the unit on the top
right hand corner or the right hand side panel (see Fig. 5,
item K).
Install a 7/8" plastic bushing in the selected hole and keep
low voltage wiring as short as possible inside the control box.
The field wiring is to be connected at the screw terminals of
the control board. Refer to Figures 14, 15 and 16.
NOTE:
All wiring must comply with local and national electri-
cal code requirements. Read and heed all unit caution labels.
NOTE:
It is possible to vary the amount of electric heat
turned on during the defrost cycle of a heat pump. Standard
wiring will only bring on 5 KW of electric heat during defrost
see Table 3 and Figures 14, 15 and 16 for alternate staging.
LINE POWER CONNECTIONS
Power may be brought into the unit through the supply air
end of the unit (top when unit is vertical) or the left side panel.
Use the hole appropriate to the unit's orientation in each
installation to bring conduit from the disconnect. The power
lead conduit should be terminated at the electrical control
box. Refer to Tables 6, 9 & 11 for wire requirements. Also see
Figure 11.
BLOWER SPEED CONNECTIONS
Except for F2FP/F3FP045(T), which has a 4-speed motor, all
air handlers contain three speed blower motors which are
prewired to the control board.
Adjust blower motor speed to provide airflow within the mini-
mum and maximum limits approved for evaporator coil, elec-
tric heat and outdoor unit. Speed tap adjustments are made
at the motor terminal block, See Figure 13. Airflow data is
shown in Tables 15, 16 and 17.
Higher efficiencies will be obtained if the indoor air volume is
as high as possible provided the CFM does not exceed limita-
tions and the sound level is not objectionable.
Connect motor wires to motor speed tap receptacle for speed
desired. See wiring label for motor wiring details. See Figure
13.
The unit control is designed for the addition of a two speed
fan kit. See accessory for details.
FIGURE 10 :
Electric Heaters in Horizontal Configuration
AIR FLOW
CIRCUIT
BREAKERS
LABEL
AIR HANDLER
OFF
ON
