16
f. DEHUMIDIFY AND SUPER DEHUMIDIFY
CAPABILITIES
These models are capable of responding to a signal
from indoor system control (thermostat, Thermidistat,
zoning control) to operate in comfort control modes
such as Super Dehumidify Mode. Consult literature
provided with indoor system control to determine if
these operating modes are available, and to see control
set up instructions. No special setup or wiring of unit
is required.
604D SEQUENCE OF OPERATION
a. CONTINUOUS FAN
(1.) Thermostat closes circuit R to G--The Blower
runs at continuous fan airflow.
b. COOLING MODE--LOW HUMIDITY
(1.) If indoor temperature is above temperature set
point and humidity is below humidity set point,
thermostat closes circuits R to G, R to Y/Y2 and
R to O--The unit delivers cooling airflow.
c. COOLING MODE--DEHUMIDIFICATION
(1.) If indoor temperature is above temperature set
point and humidity is above humidity set point,
thermostat or Thermidistat closes circuits R to G,
R to O, and R to Y/Y2 and humidistat or
Thermidistat opens R to DH--The unit delivers
airflow which is approximately 80 percent of the
nominal cooling airflow to increase the latent
capacity of the system.
d. COOLING MODE--SUPER DEHUMIDIFY
OPERATION (see quick reference guide)
NOTE
: The indoor control used, such as a Thermidistat, must be
capable of providing Super Dehumidify operation mode and
control must be configured as outlined in its installation
instructions. Consult indoor control literature to determine if
control is capable of providing Super Dehumidify inputs and for
configuration instruction.
(1.) If the indoor temperature is below the temperature
set point and the humidity is above the humidity
set point, the Thermidistat closes circuit R to O,
opens circuits R to DH and R to G, and cycles
circuit R to Y/Y2. If circuit R to G is closed
(24--v.), the motor will deliver airflow at the full
cooling or cooling plus dehumidify mode
requested value. If circuit R to G is open (0--v.)
for super dehumidify mode, the motor delivers
reduced airflow to maximize the humidity
removal of the system while minimizing over
cooling.
e. ELECTRIC HEATING MODE
(1.) Thermostat closes circuit R to W/W1, or W2--The
unit delivers the selected electric heat airflow. There
are no on or off delays.
f. HEAT PUMP HEATING MODE
(1.) Thermostat closes circuits R to G and R to
Y/Y2--The unit delivers selected heat pump
heating airflow.
g. HEAT PUMP HEATING WITH AUXILIARY
ELECTRIC HEAT
(1.) Thermostat closes circuits R to G, R to Y/Y2 and
R to W/W1 or W2 (and R to O in the case of
defrost).
In the event that electric heating is called for by
the thermostat while the heat pump is also
operating in either heating or defrost modes, the
motor will modify its airflow output, if necessary,
to provide an airflow which is defined as safe for
the operation of the electric heater during heat
pump operation. That airflow is the greater of the
heat pump heating airflow and the electric heater
only airflow.
h. HEATING MODE--SUPER COMFORT HEAT
OPERATION
NOTE
: The indoor control used, such as a Thermidistat, must be
capable of providing Super 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.
If the outdoor temperature is in the range of 12
_
to 40
_
F (--11 to
4
_
C), the Thermidistat closes circuit R to Y/Y2 and opens circuit
R to G. If circuit R to G is closed (24--v.), the motor will deliver
airflow at the full heating requested value. If circuit R to G is
open (0--v.) for maximum heating comfort, the motor delivers
reduced airflow to maximize the temperature and minimize the
draft effect of the heated air leaving the unit.
SPECIAL PROCEDURES FOR 208--V OPERATION
1. Be sure unit disconnect switch is open.
2. Disconnect the yellow primary lead (w 110) from the
transformer. See unit wiring label. (See Fig. 12 or 13 and
16.)
3. Connect the yellow primary lead (w110) to the
transformer terminal labeled 200--v.
PRE--START--UP
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Do not operate compressor or provide any electric power
to unit unless compressor terminal cover is in place and
secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing anything inside terminal box if
refrigerant leak is suspected around compressor
terminals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install lockout
tag.
b. Relieve and reclaim all refrigerant from system
using both high-- and low--pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
!
WARNING
604D
