Connect Electrical Components-Cooling; Thermostat Connections - Carrier AGATWNPME01B Installation Instructions Manual

AGATWNPME01B: Installation Instructions
CONNECT ELECTRICAL
COMPONENTS—COOLING
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death,
or property damage.
Before installing, modifying, or servicing system, main electrical
disconnect switch must be in the OFF position and install a lockout tag.
There may be more than one disconnect switch. Check accessories and
cooling unit for additional electrical supplies that must be shut off
during furnace servicing. Lock out and tag switch with a suitable
warning label. Verify proper operation after servicing.
NOTE: Cooling units used with twinned furnaces MUST be
single-stage A/C units. HEAT PUMPS CANNOT BE TWINNED with
gas furnaces.
When installing twinned outdoor units with twinned gas furnaces, it is
necessary to use field-supplied 24-VAC pilot-duty relay(s) and a
field-supplied 24-VAC/115-VAC transformer as shown in the individual
wiring diagrams to prevent overloading furnace 24-VAC/115-VAC
transformer. Transformer VA rating must be able to handle the load
imposed on it by the outdoor unit contactor(s).
1. Connect the L1 lead of the field-supplied transformer line voltage
lead to L1 on Main furnace control board.
2. Connect the Neutral lead of the field-supplied transformer to an
open Neutral terminal on the Main furnace control board.
NOTE: If sufficient room is available in the control box of the outdoor
unit, a 24-VAC/240-VAC transformer may be used. Connect line voltage
leads of the transformer to the appropriate connection locations on the
outdoor unit, Refer to the outdoor unit wiring diagram for specific
details.
For Two-Stage A/C Operation with a Two-Stage
Thermostat
See Fig. 23
In this configuration, the A/C unit(s) are staged on and run as controlled
by the thermostat. It will be necessary to supply two pilot duty relays for
staged A/C operation. One A/C unit will be the first stage unit, the other
A/C unit will be the second stage unit. Both furnaces come on in high
cooling airflow, regardless of A/C staging.
1. Connect one coil terminal of each of the pilot duty relay together.
2. Connect these two terminals to the "COM/24V" terminal of the
furnace control board.
3. Select one of the relays to be the relay for first stage cooling.
Connect the coil terminal of this relay to the "Y/Y2" terminal of the
furnace control board.
4. The other relay is the second stage cooling relay. The coil terminal
of this relay will connect to the "Y/Y2" terminal of the thermostat.
Do not connect the terminal to the Y1 terminal on the furnace
control board.
5. Connect the R terminal of the field-supplied transformer to the open
contact of each pilot duty relay.
6. Connect the other open contact of the first stage cooling relay to the
wire for Y terminal of the first stage contactor.
7. Connect the other open contact of the first stage cooling relay to the
wire for Y terminal of the second stage contactor.
8. Connect the Common terminal of the contactor(s) to the C terminal
of the field supplied transformer.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
24 VAC
115 VAC
Fig. 23 – Field-Installed A/C Wiring (when required)
For Single-Stage A/C Operation with a Single-Stage
Thermostat
See Fig. 24
In this configuration, the A/C unit(s) run as a single unit. It will be
necessary to supply a pilot duty relay for A/C operation.
1. Connect one coil terminal of the pilot duty relay to "COM/24V" of
the furnace control board.
2. Connect the other coil terminal of this relay to the "Y/Y2" terminal
of the furnace control board.
3. Connect the R terminal of the field-supplied transformer to the open
contact of the pilot duty relay.
4. Connect the other open contact of the first stage cooling relay to the
wire for Y terminal of each outdoor unit contactor.
5. Connect the Common terminal of the contactor(s) to the C terminal
of the field supplied transformer.
24 VAC
115 VAC
Fig. 24 – Field-Installed A/C Wiring (when required)

THERMOSTAT CONNECTIONS

!
UNIT DAMAGE AND FIRE HAZARD
Failure to follow this warning could result in fire, personal injury or
death.
Make no connections between the connector in one furnace and the
connector in other furnace.
NOTE: All thermostat connections MUST be made at the Main furnace
control board. Do not make any thermostat connections to the Secondary
furnace control board.
17
WARNING
L14F004
L14F005