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.

51

Page 51
Image 51
Carrier 48HJ004---007 Filters, Lubrication Compressor, Fan motor bearings, Condenser-Fan Adjustment, High Pressure Switch

48HJ004---007, 48HE003---006 specifications

Carrier has long been a trusted name in the HVAC industry, and its models 48HJ004---007 and 48HE003---006 continue that legacy, offering efficient, reliable climate control solutions. These models are designed for different applications, ensuring optimal performance in a variety of environments.

The 48HJ series features advanced rooftop units that are ideal for commercial settings. They come equipped with high-efficiency scroll compressors that provide superior cooling and heating capabilities. This series is noted for its compact design, allowing for easy installation on rooftops or other constrained spaces. The units offer variable capacity operation, which enables them to efficiently meet varying heating and cooling demands without unnecessary energy consumption.

One of the standout features of the 48HJ series is its use of advanced microprocessor controls. This technology allows for precise temperature management and system diagnostics, enhancing the ease of operation while ensuring maximum comfort. Additionally, the series supports advanced connectivity options, enabling integration with building management systems. This allows for remote monitoring and control, making it easier for facility managers to keep track of performance and energy usage.

On the other hand, the 48HE series specializes in high-efficiency heating and cooling performance. These units are designed for larger commercial spaces and come with robust features for enhanced durability and efficiency. Like the 48HJ series, the 48HE models utilize scroll compressors and are equipped with a high-efficiency fan setup for improved airflow and reduced noise levels.

The 48HE also includes an innovative heat pump option, which allows the system to reverse the cooling process to provide heating, making it versatile across different seasonal demands. Both series are designed with eco-friendly refrigerants that comply with the latest environmental regulations, ensuring a minimized ecological footprint.

In terms of energy efficiency, both the 48HJ and 48HE series hold impressive SEER and EER ratings, contributing to reduced operational costs over time. The units are also built with durable, corrosion-resistant materials, ensuring longevity and low maintenance needs.

In conclusion, Carrier 48HJ004---007 and 48HE003---006 models are designed with cutting-edge technology, energy efficiency, and flexibility in mind. Their robust features make them ideal choices for commercial applications, providing reliable comfort and operational excellence. Whether for cooling or heating, these systems stand out in performance and sustainability, earning Carrier's reputation as a leader in the HVAC market.