contacts close, the airflow will return to 100 percent of
selected cooling airflow. To activate this mode, remove
jumper J1 and wire in a standard humidistat (See Fig.
20–22).
f. DEHUMIDIFY AND SUPER DEHUMIDIFY CAPABILI-
TIES
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.
50XZ 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 approxi-
mately 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 instruc-
tions. Consult indoor control literature to determine if control is
capable of providing Super Dehumidify inputs and for configura-
tion 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 cir-
cuits 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 OPERA-
TION
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 instruc-
tions. 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, 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 trans-
former. See unit wiring label. (See Fig. 14 or 15 and 18)
3. Connect the yellow primary lead (w110) to the transformer
terminal labeled 200-v.
Fig. 22—Humidistat Wiring for De-Humidify Mode-
for 50XZ
A95316
EASY SELECT
BOARD TERMINAL
BLOCK
D
H
J1
R
HUMIDISTAT
REMOVE
JUMPER
17
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