The start up and shut down functions and delays described in item 1. above apply to the
a.Switching from Low- to
b.Switching from High- to
3.Cooling
a.Single-Speed Cooling-
(See Fig. 27 for thermostat connections)
The thermostat closes the
The electronic air cleaner terminal
When the thermostat is satisfied, the
b.
(See Fig. 32 for thermostat connections)
This furnace can operate a
NOTE: The air conditioning relay disable jumper ACRDJ must be connected to enable the adaptive cooling mode in response to a call for cooling. (See Fig. 33.) When ACRDJ is in place, the furnace control CPU can turn on the air conditioning relay ACR to energize the Y/Y2 terminal and switch the outdoor unit to
The furnace control CPU can start up the cooling unit in either low- or
The wall thermostat “calls for cooling”, closing the
If the furnace control CPU switches from
NOTE: When transitioning from
The electronic air cleaner terminal
c.
NOTE: The air conditioning relay disable jumper ACRDJ must be disconnected to allow thermostat control of the outdoor unit staging. (See Fig. 33.)
The thermostat closes the
4.Thermidistat Mode
(See Fig. 26 - 28 for Thermidistat connections) The dehu- midification output, DHUM on the Thermidistat should be connected to the furnace control thermostat terminal DHUM. When there is a dehumidify demand, the DHUM input is activated, which means 24 vac signal is removed from the DHUM input terminal. In other words, the DHUM input logic is reversed. The DHUM input is turned ON when no dehumidify demand exists. Once 24 vac is detected by the furnace control on the DHUM input, the furnace control operates in Thermidistat mode. If the DHUM input is low for more than 48 hours, the furnace control reverts back to
The cooling operation described in item 3. above also ap- plies to operation with a Thermidistat. The exceptions are listed below:
a.Low cooling - When the
b.High cooling
312AAV
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