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and continuous operation. (See Tables 16, 17 & 18 for airflow
delivery and minimum CFM.) Note that airflow marked is the
airflow which will be supplied in emergency heat mode and
heating mode on air conditioners when electric heat is the
primary heating source. In heat pump heating mode when
electric heaters are energized, the ICM will run the higher of
heat pump heating airflow and electric heater airflow to ensure
safe heater operation. The factory selection is the largest heater
range approved (See Fig. 11, A as indicated).
b. AC/HP SIZE—SELECT SYSTEM SIZE INSTALLED
The factory setting for air conditioner or heat pump size is the
size which matches the model of packaged unit installed.
Installer should verify air conditioner or heat pump size to
ensure that airflow delivered falls within proper range for the
size unit installed. This applies to all operational modes with
the exception of electric heat modes (See Fig. 11, B as
indicated).
c. SYSTEM TYPE—SELECT SYSTEM TYPE INSTALLED
The type of system will be factory selected (see below for
details):
(1.) AC-Air conditioner (Factory Selected for 50GL)
(2.) HP-COMFORT—Heat Pump Comfort provides approxi-
mately 315 CFM per ton for higher normal heating air
delivery temperature and provides approximately 350
CFM per ton cooling airflow for good humidity removal.
(3.) HP-EFF (Factory Selected for 50JZ)— Heat Pump Effi-
ciency provides same airflow for heating and cooling
modes to increase overall HP efficiency; approximately
350 CFM per 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 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. CFM 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. 11, 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. 11, 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.
(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 heat-up/cool-down 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.
(4.) ENH, enhanced selection, provides a 30 sec cooling on
delay with no airflow/ plus 150 sec at 70 percent airflow/
no off delay for added comfort.
This will minimize cold blow in heat pump operation
(50JZ only) and could enhance system efficiency.
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. 11, 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 System. This BASIC
CONFIGURATION should be used when the rated ARI perfor-
mance is required, or if system enhancements such as super
dehumidify are not needed.
(1.) AUX HEAT kW/CFM-Select the heater range for the size
of electric heater installed (skip this step if no heater is
installed).
(2.) AC/HP SIZE-Factory selected to match system size in-
stalled, please verify.
(3.) SYSTEM TYPE-Factory selected AC (50GL) or HP-EFF
(50JZ).
(4.) AC/HP CFM ADJUST-Select HIGH for 042 & 048, NOM
for 036 & 060, and LO for 024 & 030.
(5.) ON/OFF DELAY-Select 0/90 profile.
(6.) CONTINUOUS FAN-Select desired fan speed when ther-
mostat 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 Thermidistat™ control (Super
Dehumidify does not require an outdoor temperature sensor).
The following configuration is recommended for maximum
cooling/dehumidifying comfort: This configuration will im-
prove the comfort provided by the air conditioning system if
more humidity removal is desired. While providing this im-
proved comfort, the system will operate efficiently, but not at
the published HSPF or ARI SEER efficiency.
The following system configuration is recommended for maxi-
mum heating and cooling/dehumidifying comfort (See Fig. 11).
(1.) AUX HEAT kW/CFM-Select the narrowest heater range to
match size of electric heater installed (skip this step if no
heater is installed).
(2.) AC/HP Size-Factory selected to match system size in-
stalled, please verify.
(3.) SYSTEM TYPE-Select system type HP-COMFORT (for
heat pump system) or AC (for air conditioner system).
(4.) AC/HP CFM ADJUST-Select NOM (Lo for 060).
(5.) ON/OFF DELAY-Select ENH profile.
(6.) CONTINUOUS FAN-Select desired fan speed when ther-
mostat 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™ (or capable zoning
system)-Following its installation instructions for Super
Dehumidify and Super Comfort Heat operation.
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