HEATING MODE — COMFORT HEAT OPERATION
NOTE: The indoor control used, such as a Thermidistat, must be
capable of providing Comfort Heat operation mode and control
must be configured as outlined in its installation instructions. The
system must be installed with appropriate outdoor temperature
sensor. Consult indoor control literature to determine if control is
capable and for configuration instructions. Consult indoor control
instructions and sensor instructions for sensor installation details.
1. If the outdoor temperature is in the range of 10° to 40°F, the
Thermidistat closes circuit R to Y/Y2 (for single speed system
R to Y1, or R to Y1 and Y/Y2 for 2-speed system) and opens
circuit R to G.
The ICM2 motor reads the G signal to the fan coil. If circuit
R to G is closed (24 vac), the motor will deliver airflow at
the full heating requested value. If circuit R to G is open (0
vac) for maximum heating comfort, the motor delivers
reduced airflow to maximize the temperature and minimize
the draft effect of the heated air leaving the fan coil.
CARE AND MAINTENANCE
For continuing high performance, and to minimize possible
equipment failure, it is essential that periodic maintenance be
performed on this equipment. The only required maintenance that
may be performed by the consumer is filter maintenance.
Disconnect all power to unit before servicing field wires or
removing control package. The disconnect (when used) on
access panel does not disconnect power to the line side of
disconnect, but does allow safe service to all other parts of
unit. If unit does not have a disconnect, disregard the
foregoing. Instead, make sure that a disconnecting means is
within sight from, and is readily accessible from, the unit.
Disconnect all electrical power to unit before performing any
maintenance or service on it. A failure to follow this warning
can cause electrical shock, fire, personal injury, or death.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect and clean or replace air filter each month or as
required.
2. Inspect cooling coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean as necessary. An inspec-
tion port is provided on all A-coil delta plates. Remove plastic
plug to inspect.
3. Inspect blower motor and wheel for cleanliness each heating
and cooling season. Clean as necessary.
4. Inspect electrical connections for tightness and controls for
proper operation each heating and cooling season. Service as
necessary.
Consult fan coil service manual available from equipment distribu-
tor for maintenance procedures.
As with any mechanical equipment, personal injury can result
from sharp metal edges, etc, therefore, care should be taken
when removing parts.
Using Owner’s/User Manual furnished in outdoor unit, the install-
ing technician should explain to the consumer system operation
with particular emphasis on indoor fan coil operation sounds and
filter maintenance.
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