Carrier 48XP024 - Page 12

12
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 YELLO
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
C01039
Fig. 12 -- Detail of SPP Printed--Circuit Board
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 48XP for AC--Air conditioner.
For Gas Heat/Electric Cool Unit--AC must be selected.
d. AC/HP CFM ADJUST--SELECT NOMINAL, LOW,
OR HIGH AIRFLOW
The AC/HP CFM Adjust select is factory set to the
NOM 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 individual installation
needs for such things as noise, comfort, and humidity
removal (See Fig. 12, D as indicated).
e. ON/OFF DELAY-- SELECT DESIREDTIME
DELAY PROFILE
Four motor operation delay profiles are provided to
customize and enhance system operation (See Fig. 12,
E as indicated).
Selection options are:
(1.) The standard 90 sec off delay (Factory Setting) at
100 percent airflow in cooling mode. In heating
mode, IGC will control 45 sec on delay with no
airflow and 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 in conjunction with the airflow in
heating mode.
(3.) A no delay option used for servicing unit or
when a thermostat is utilized to perform delay
functions in cooling mode. In heating mode IGC
will control 45 sec on delay with no airflow and
45 sec off delay.
(4.) ENH-- Not recommended for 48XP
f. CONTINUOUS FANSELECT DESIRED FAN
SPEED WHEN THERMOSTAT IS SET ON
CONTINUOUS FAN
(1.) LO speed--Factory setting, 50 percent cooling
mode airflow.
(2.) MED speed--Move connector to MED, 65 percent
cooling mode airflow.
(3.) HI speed--Move connector to HI, 100 percent
cooling mode airflow (See Fig. 12, F as
indicated).
g. LOW--VOLTAGE CIRCUIT FUSING AND
REFERENCE
The low--voltage circuit is fused by a board--mounted
5--amp automotive fuse placed in series with the
transformer SEC2 and the R circuit. The C circuit of
the transformer is referenced to chassis ground through
a printed circuit run at SEC1 connected to metal
standoff marked with ground symbol.
h. BASIC UNIT CONFIGURATION
The following basic configuration of the indoor motor
will provide ARI rated performance of the 48XP. This
BASIC CONFIGURATION should be used when the
rated ARI performance is required, or if system
enhancements such as super dehumidify are not
needed.
(1.) HEAT--Factory selected to match heat input size.
(2.) AC/HP Size--Factory selected to match system
size, please verify.
(3.) SYSTEM TYPE--Factory selected on 48XP
system AC--AIR CONDITIONER.
(4.) AC/HP CFM ADJUST--Select NOM.
(5.) ON/OFF DELAY--Factory selected 0/90 profile.
(Do Not Use ENH profile for Gas Packaged
Units)
(6.) CONTINUOUS FAN--Select desired fan speed
when thermostat is set to continuous fan.
i. COMFORT OPTIONSSUPER DEHUMIDIFY (See
Quick Reference Guide)
The Super Dehumidify option is possible when this
unit is installed with a field supplied Thermidistatt
control (SuperDehumidify does not require an outdoor
temperature sensor). The following configuration is
recommended for maximum cooling/dehumidifying
comfort. This configuration will improve the comfort
provided by the air conditioning system if more
humidity removal is desired. While providing this
improved comfort, the system will operate efficiently,
but not at the published ARI SEER efficiency. During
cool--to--dehumidify call, it provides maximum
dehumidification by reducing airflow to a minimum.
The actual super dehumidify command from
Thermidistat control to the indoor unit is a “Y” signal
without a “G” signal in addition to dehumidify signal.
The indoor unit responds to this combination by
reducing the airflow to a minimum. All other
48XP