Carrier 48HJ004---007 Filters, Lubrication Compressor, Fan motor bearings, High Pressure Switch

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

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.

48HE,HJ

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.

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.

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