Carrier 48HJ004---007 User Manual
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Table 39—Humidi-Mizer Adaptive Dehumidification System Sequence of Operation and
System Response — Single Compressor Unit (48HE003--006, 48HJ004-007)
THERMOSTAT INPUT
ECONOMIZER FUNCTION
48HE, HJ UNIT OPERATION
H
Y1
Y2
OAT. < Economizer Set Point
Economizer
Comp. 1
Subcooling Mode
Hot Gas Reheat Mode
Off
—
—
Normal Operation
On
On
On
No
Off
On
Yes
No
On
On
Off
No
Off
On
Yes
No
On
On
On
Yes
On
On
Yes
No
On
On
Off
Yes
On
On
No
Yes
On
Off
Off
No
Off
On
No
Yes
NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.
LEGEND
OAT --- Outdoor Air Temperature
C06045
Fig. 57
--- Propping Up Top Panel
C06046
Fig. 58
--- Separating Coil Sections
4. Remove screws securing coil to compressor plate and
compressor access panel.
5. Remove fastener holding coil sections together at return
end of condenser coil. Carefully separate the outer coil
section 3 to 4 in. from the inner coil section. (See Fig. 58.)
6. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and
debris. Clean the outer surfaces with a stiff brush in the
normal manner.
7. Secure inner and outer coil rows together with a
field-supplied fastener.
8. Reposition the outer coil section and remove the coil
corner post from between the top panel and center post.
Reinstall the coil corner post and replace all screws.
condensate drain
Check and clean each year at the start of the cooling season. In
winter, keep the drain dry or protect it against freeze-up.
filters
Clean or replace at the start of each heating and cooling season, or
more often if operating conditions require it. Replacement filters
must be the same dimensions as the original filters.
outdoor--air inlet screens
Clean the screens with steam or hot water and a mild detergent.
Do not use disposable filters in place of screens.
Step 2
—Lubrication
compressor
The compressor is charged with the correct amount of oil at the
factory.
fan motor bearings
Fan motor bearings are permanently lubricated. No further
lubrication is required.
No lubrication of condenser-fan or
evaporator-fan motors is required.
Step 3
—Condenser--Fan Adjustment
Shut off unit power supply. Remove condenser-fan assembly
(grille, motor, motor cover, and fan) and loosen fan hub
setscrews. Adjust fan height as shown in Fig. 59. Tighten
setscrews and replace condenser-fan assembly.
UNIT
FAN HEIGHT (in.) — “A”
003-006 AND 007 (208/230 v)
2.75
007 (460 v)
3.50
C06138
Fig. 59
--- Condenser--Fan Adjustment
Step 4
—EconoMi$er IV Adjustment
Refer to Optional EconoMi$er IV and EconoMi$er2 section.
Step 5
—Evaporator Fan Belt Inspection
Check con-dition of evaporator belt or tension during heating and
cooling inspections or as conditions require. Replace belt or
adjust as necessary.
Step 6
—High Pressure Switch
The high-pressure switch contains a Schrader core depressor, and
is located on the compressor hot gas line. This switch opens at
428 psig and closes at 320 psig. No adjustments are necessary.
48H
E,
H
J