15
EASY SELECT
HEATER/MOTOR
AUX HEAT KW/CFM
0-30
1075
SEC1
SEC2
J1
AC/HP SIZE
036
030
024
018
AC
HP-COMFORT
HP-EFF
NOM
HI
ENH
LO
SYSTEM TYPE
AC/HP CFM ADJUST
ON/OFF DELAY
CONTINUOUS FAN
MED
HI
YEL
LO
AUX1
HUM1
AUX2
24VAC
GRY
HUM2
YEL
WHT
BLK
ORN
BLU
VIO
0-20
875
0-10
725
0
90
30
90
0
0
0-5
625
TM
J2
D
H
R
W
1
W
2
Y
1
Y/Y
2
G
O
C
9 PIN CONNECTOR
ICM PRINTED CIRCUIT BOARD
12 PIN CONNECTOR
A
B
C
D
E
F
C01033
Fig. 18 -- Detail of SPP Printed--Circuit Board
(6.) CONTINUOUS FAN--Select desired fan speed
when thermostat is set to continuous fan.
(7.) DEHUMIDIFY MODE--Remove J1 jumper to
activate.
(8.) LOW VOLTAGE CONNECTIONS--Make
connections as shown in ELECTRICAL
CONNECTIONS section.
(9.) CONFIGURE THERMIDISTAT
t
(or capable
zoning system)--Following its installation
instructions for Super Dehumidify and Super
Comfort Heat operation.
This configuration provides the following comfort enhancements:
a. A 30 sec blower on delay with 150 sec at 70 percent
airflow to allow the indoor coil to warm up or cool
down before the blower is asked to deliver 100
percent airflow reducing the cold blow sensation at
start up in heating and allowing the indoor coil to
more quickly reach wet coil operating conditions in
cooling.
b. A no blower off delay eliminates cold blow which
may be associated with running the blower after shut
down of the compressor and avoids reevaporation of
condensed moisture after cooling/dehumidifying
operation.
c. Lower airflow while the compressor is running to
reduce draft effects and increase heating air
temperature and improved humidity control during
cooling operation.
ACCESSORY INSTALLATION
a. ACCESSORY ELECTRIC HEATERS
Electric heaters may be installed with the 604D units
per instructions supplied with electric heater package.
See unit rating plate for factory--approved electric
heater kits.
b. AUXILIARY TERMINALS
The AUX and HUM terminals on the Easy Select
Board are tied directly to the G terminal, and provide a
24--v. signal whenever the G terminal is energized (See
Fig. 18). During Super dehumidify mode, the G signal
is not present and the auxiliary terminals are not
energized. If the installation includes the use of the
operating mode, do not use these terminals to control
accessories. See Electronic Air Cleaner and Humidifier
sections for further information.
c. ELECTRONIC AIR CLEANER CONNECTIONS
The AUX1 and AUX2 terminals are not always
energized during blower operations, as described
above. When using an electronic air cleaner with the
unit, use Airflow Sensor (See Air Cleaner Price Pages
for Part Number). The airflow sensor turns on
electronic air cleaner when the blower is operating.
d. HUMIDIFIER/HUMIDISTAT CONNECTIONS
Easy Select
t
Board terminals HUM1 and HUM2 are
provided for direct connection to the low--voltage
control of a humidifier through a standard humidistat
(See Fig. 18--20). These terminals are energized with
24--v. when G thermostat signal is present. (See Fig.
18--20). Alternately, the 24--v. signal may be sourced
from the W and C circuit board connections. When
using a Thermidistat
t
Control, Zone Comfort Plus or
Comfort Zone II, the 24--v. signal may be sourced
directly from the Thermidistat
t
HUM terminal.
HUMIDISTAT
TO HUMIDIFIER
HUMIDIFIER WIRING
HUM 1
(C)
HUM 2
(G)
24-VAC
A95317
Fig. 19 -- Humidifier Wiring for 604D
EASY SELECT
BOARD TERMINAL
BLOCK
D
H
J1
R
HUMIDISTAT
REMOVE
JUMPER
A95316
Fig. 20 -- Humidistat Wiring for De--Humidify Mode for
604D
e. DEHUMIDIFY CAPABILITY WITH STANDARD
HUMIDISTAT CONNECTION
Latent capacities for these units are better than average
systems. If increased latent capacity is an application
requirement, the circuit board provides connection
terminals for use of a standard humidistat. The unit
will detect the humidistat contacts opening on
increasing humidity and reduce its airflow to
approximately 80 percent of nominal cooling mode
airflow. This reduction will increase the system latent
capacity until the humidity falls to a level which
causes the humidistat to close its contacts. When the
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.
18--20).
604D
