Starting The Unit In Heating Mode; Heating Shutdown; Sequence Of Operation; General - Trane 4TCY4024 Installer's Manual

Installer's Guide

Starting the Unit in Heating Mode

NOTE: See the section on "Sequence of Operation" for a de-
scription of the heating operating sequence.
Check that all grills and registers are open and all unit access panels
are closed before start-up.
Set the comfort control above room temperature until achieving a
first stage call for heat and set the fan control to AUTO or ON.
Heating Shut Down
Set the comfort control to OFF or to a setting below room temperature.

Sequence of Operation

General

Operation of the system cooling (and optional heating) cycles is
controlled by the comfort control. Once the comfort control is set
to either HEAT or COOL, unit operation is automatic. The optional
auto matic changeover control, when set to AUTO, auto matically
changes to heat or cool with sufficient room temperature change.
The fan can be set to ON, causing continuous evaporator (indoor)
fan operation or set to AUTO causing fan operation to coincide with
heating or cooling run cycles. Continuous fan mode during cooling
operation may not be appropriate in humid climates. If the indoor air
exceeds 60% relative humidity or simply feels uncomfortably humid,
it is recommended that the fan only be used in the AUTO mode.

Cooling Mode

With the comfort control set to COOL and the fan set to AUTO,
the com pressor contactor (CC) and the indoor fan motor (IDM) are
energized.
The energized compressor contactor (CC) completes the cir cuit
to the compressor (CPR) and a secondary circuit to the outdoor
fan motor (ODM). If the compressor safety controls are closed, the
compressor (CPR) will operate with the outdoor fan motor (ODM).
The indoor fan motor (IDM) will operate. The comfort control will
continue to cycle the compressor and fans to maintain the desired
temperature.
With the fan set to ON, the indoor fan motor (IDM) will continue to
run regardless of compressor and condenser fan operation.

Heating Mode

Heating mode uses electric heaters, which are installed separately.
Refer to the Supplemental Electric Heaters Installer's Guide for
additional information.
On a call for heat, power from the comfort control is received at
"W1", which energizes the "AH" contactor coil. The "AH" contactor
closes powering the heater, provided all element limits are closed.
If two stages of heat are provided and additional heat is required,
the comfort control's second stage "W2" circuit is energized power-
ing the "BH" contactor coil.
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NOTE: The indoor comfort control must be configured to provide
a "G" signal to energize the indoor fan relay (F) during the heating
mode. The heater control circuit will not be energized unless the
indoor fan relay (F) is energized.
Final Installation Checklist

Does the unit run and operate as described in the section on
"Sequence of Operation" in response to the room thermo-
stat?

Are the condenser fan and indoor blower operating correctly
with proper rotation and without undue noise?

Is the compressor operating correctly and has the system
been checked with a charging chart?

Has the voltage and running current been checked to deter-
mine if it is within limits?

Has the thermostat been checked for calibration and the air
discharge grilles adjusted to balance the system?

Has the ductwork been checked for air leaks and condensa-
tion?

Has the furnace manifold pressure been checked and ad-
justed if necessary?

Has the heating air temperature rise been checked?

Has the unit been checked for tubing and sheet metal
rattles? Are there any other unusual noises to be checked?

Are all covers and panels in place and properly fastened?

Has the owner been instructed on proper operation and
maintenance of the unit? Be sure to leave this manual with
the owner.

Maintenance

Owner Maintenance

Some of the periodic maintenance functions of the unit can be
performed by the owner; this includes replacing the disposable or
cleaning the permanent air filters, cleaning the unit cabinet, and
conducting a general unit inspection on a regular basis.
Filters
When the system is in constant operation, inspect the filters at
least once each month.
If the unit has disposable-type filters, replace them with new filters of
the same type and size. Do not attempt to clean disposable filters.
Permanent-type filters can be cleaned by washing them with a mild
detergent and water. Make sure that the filters are thoroughly dry
before reinstalling them in the unit (or duct system).
NOTE: It may be necessary to replace permanent filters an-
nually if washing fails to clean the filter or if the filter shows
signs of deterioration. Be sure to use the same type and size
as was originally installed.
Condenser Coil
Be sure to keep all vegetation and debris away from the condenser
coil area.