Carrier 50JZ 024-060 - Manual (Page 5)

b. COOLING MODE
(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
single speed cooling airflow.
c. COOLING MODE-DEHUMIDIFICATION
(1.) If indoor temperature is above temperature set point and
humidity is above humidity set point, thermostat or Ther-
midistat™ closes circuits R to G, R to Y/Y2, R to O 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 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 circuits R to
DH and R to G, and closes 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 Dehu-
midify mode, the motor delivers reduced airflow to maxi-
mize the humidity removal of the system while minimizing
over cooling.
e. GAS HEATING MODE
(1.) Thermostat closes circuit R to W/W1—The unit delivers
the selected gas heat airflow. The IGC will control a 45
sec. blower “On” delay and a 45 sec. “Off” delay.
EASY SELECT™—48JZ
NOTE: Either the Carrier Thermidistat™ or Dual Fuel ther-
mostat is required for operation of the dual-fuel (48JZ) units.
Be sure to follow the installation instructions supplied with the
Thermidistat™. Either indoor temperature control must use
an outdoor air sensor to properly control heating operation.
EASY SELECT™ CONFIGURATION TAPS FOR 48JZ
Easy Select™ taps are used by the installer to configure a system.
The ICM motor uses the selected taps to modify its operation to a
pre-programmed table of airflows.
The unit must be configured to operate properly with system
components with which it is installed. To successfully configure a
basic system (see information printed on circuit board label located
next to select pins), move the 6 select wires to the pins which
match the components used (See Fig. 8).
a. GAS HEAT/CFM—SELECT GAS HEAT INPUT SIZE
Factory selected gas heat size should correspond to unit label.
b. AC/HP SIZE—SELECT SYSTEM SIZE INSTALLED
Factory selected air conditioner size should correspond to
capacity of unit installed. Installer should verify air conditioner
size to ensure that airflow delivered falls within proper range
for the size unit installed. This applies to all operational modes.
c. SYSTEM TYPE—SELECT SYSTEM TYPE INSTALLED
Factory selected on 48JZ for HP-EFF.
SELECT OPTIONS
1. HP-COMFORT provides approximately 315 CFM/ton for
higher normal heating air temperature and provides approxi-
mately 350 CFM/ton cooling airflow for good humidity re-
moval
2. HP-EFF (factory selected) Provides equal airflow for heating
and cooling modes to increase overall heat pump efficiency.
Provides approximately 400 CFM/ton.
d. AC/HP CFM ADJUST—SELECT NOMINAL, LOW, OR
HIGH AIRFLOW
The AC/HP CFM Adjust select is factory set to the High-HI
(NOM for 036, 060) tap. The CFM Adjust selections NOM/LO
will regulate airflow supplied for all operational modes, except
non-heat pump heating modes. HI provides 15 percent airflow
over nominal unit size selected and LO provides 10 percent
airflow below nominal unit size selected. Adjust selection
options are provided to adjust airflow supplied to meet indi-
vidual installation needs for such things as noise, comfort, and
humidity removal (See Fig. 8, D as indicated).
e. ON/OFF DELAY—SELECT DESIRED
TIME DELAY PROFILE
Four motor operation delay profiles are provided to customize
and enhance system operation (See Fig. 8, E as indicated).
Selection options are:
(1.) The standard 90 sec off delay (Factory Setting) at 100
percent airflow in cooling or heat pump heating mode. In
gas heating mode, IGC will control a 45 sec “On” delay
and a 45 sec “Off” delay.
(2.) A 30 sec cooling delay with no airflow/ 90 sec off delay at
100 percent airflow profile is used when it is desirable to
allow system coils time to cool-down/heat-up in conjunc-
tion with the airflow in cooling or heat pump heating
mode.
(3.) A no delay option used for servicing unit or when a
thermostat is utilized to perform delay functions. In gas
heating mode IGC will control 45 sec on delay with no
airflow and 45 sec off delay.
Fig. 8—Detail of SPP Printed-Circuit Board
C01039
EASY SELECT
HEATER/MOTOR
GAS HEAT/CFM
090
1250
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
060
1100
040
800
0
90
30
90 0
0
N/A
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
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