HP H4H3 manual Defrost System, Defrost Thermostat, Defrost Control Board

Page 11

INSTALLATION INSTRUCTIONS

3-phase R-410A Split System Heat Pump

 

 

DEFROST SYSTEM

A. DEFROST THERMOSTAT

The defrost thermostat is factory installed on a short tube stub extending from the coil end plate. Refer to Figure 12 and confirm that the thermostat is securely fastened in place on the tube stub.

Figure 12

Defrost Thermostat

 

 

FEEDER TUBE

TUBE STUB

COIL

DEFROST

THERMOSTAT

B. DEFROST CONTROL BOARD

The defrost board is a time/temperature control which includes a field-selectable time period between defrost cycles of 30, 60, or 90 minutes (quick-connects located at board edge, factory set at 90 minutes).

Defrost mode is identical to cooling mode except that outdoor-fan motor stops and second-stage heat is turned on to continue warming conditioned space.

Initially, the defrost cycle timer starts when the contactor is energized and a 24 VAC signal is present on the T1 terminal. Then the defrost cycle begins when the defrost thermostat is closed and the cycle timer times out (30, 60, 90 or minutes).

To initiate a forced defrost cycle, the defrost thermostat must be closed. This can be accomplished as follows:

1.Turn off power to outdoor unit.

2.Disconnect outdoor fan-motor lead from OF2 on control board (refer to Figure 13). Tape lead to prevent grounding.

3.Restart unit in heating mode, allowing frost to accumulate on outdoor coil.

4.After a few minutes in heating mode, liquid line temperature should drop below closing point of defrost thermostat (approximately 32 °F).

5.Short between speed-up terminals with a flat-bladed screwdriver (refer to Figure 13). This reduces the timing sequence to 7, 14, or 21 seconds (30, 60, or 90 minute defrost selection, respectively).

6.When you hear reversing valve change position, remove screwdriver immediately; otherwise, control will terminate normal 10-minute defrost cycle in approximately 2 seconds.

NOTE: Length of defrost cycle is dependent upon length of time it takes to remove screwdriver from test pins after reversing valve has shifted.

7.Unit will remain in defrost for remainder of defrost-cycle time or until defrost thermostat reopens at approximately 65 °F coil temperature of liquid line.

8.Turn off power to outdoor unit and reconnect fan-motor lead to OF2 on control board (refer to Figure 13).

 

Figure 13

 

Defrost Control Board

 

 

 

 

 

 

H9C1

O1

R6

 

 

R14 R13

 

 

 

 

 

 

OF1

C

US

 

 

 

 

 

 

 

 

 

 

 

K1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

 

D13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-01A5501A

 

C19

OF2

 

D4

 

JW2 C10

C4

R8

R7

 

 

 

C9

 

JW1

 

 

 

 

 

 

 

 

 

 

 

C1

A29

R9

 

 

 

CEBD430524

 

 

 

 

 

 

 

 

1

U1

 

 

 

 

D10

 

 

 

 

 

 

 

 

C17

 

 

 

 

D1

D2

R26

 

 

D6

R28

C7

JW3

C13

 

R4

 

 

 

D3

C16

 

U3

HK32EA001

 

 

 

 

 

 

 

 

 

1

 

 

R11

 

 

 

 

 

 

 

 

 

 

R20

 

 

 

 

 

 

 

 

 

 

 

 

R1 R2

R3

R5

 

 

 

 

1

 

DFT

P3

 

 

 

 

 

 

 

 

 

Y

 

J2

 

 

 

 

 

 

 

 

P2

1

 

 

W1

 

 

 

 

 

 

 

 

 

30 60 90

 

 

 

T1 C C O

 

 

P1

J1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPEEDUP

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

506 01 5102 00

11

Image 11
Contents Table of Contents Installation InstructionsClearances Safety ConsiderationsInspect NEW Unit LocationClearances various examples Fastening Unit Down Ground Level InstallationRoof TOP Installation Unit SupportRefrigeration System Outdoor Unit Higher than Indoor Unit Installed at Indoor CoilRouting and Suspending Refrigerant Lines Liquid Line Filter-DrierEvacuating Line SET and Indoor Coil Installation Instructions Service ValvesBrazing Connections Fire Hazard Triple Evacuation Method Opening Service ValvesDeep Vacuum Gauge Response System ConditionsElectrical Wiring Typical Thermostat Control Circuit Connections Defrost Control Board Defrost SystemDefrost Thermostat Defrost ThermostatRefrigerant Charge START-UP ProcedureCooling Mode Heating ModeSequence of Operation Maintenance TroubleshootingRed Trip LED Comfort Alertt Diagnostics some modelsYellow Alert Missing Phase Yellow Alert Reverse PhaseAlert Flash Code 5 or 410A Quick Reference GuideTrip LED and Alert LED Alert Flash Code

H4H3 specifications

The HP H4H3 is a versatile and efficient device designed primarily for business and professional use. This printer exemplifies HP's commitment to innovation, focusing on performance, quality, and convenience. One of the standout features of the HP H4H3 is its ability to produce high-quality prints at an impressive speed, making it ideal for busy office environments. The printer is capable of delivering professional-grade documents with a resolution that can reach up to 1200 x 1200 dpi, ensuring that text and images come out crisp and vibrant.

One of the key technologies that enhance the functionality of the HP H4H3 is the HP LaserJet technology, which allows for faster warm-up times and reduced energy consumption compared to traditional laser printers. This tech not only optimizes power usage but also minimizes the environmental impact, aligning with modern sustainability goals. Another significant characteristic is its robust paper handling capabilities, which can accommodate various paper sizes and types, ranging from envelopes to legal-sized documents. This versatility allows users to tackle various printing tasks without the need for constant paper changes.

The HP H4H3 also incorporates advanced connectivity features, such as USB, Ethernet, and wireless options, providing flexibility in how users choose to connect their devices. The inclusion of mobile printing capabilities through HP Smart App and other cloud services provides users with the convenience of printing from smartphones and tablets, catering to an increasingly mobile workforce.

Security is another focal area in the design of the HP H4H3. It comes equipped with robust built-in security features that help protect sensitive data from unauthorized access. With options for secure printing and user authentication, it ensures that confidential documents remain secure, even in shared environments.

Furthermore, the printer is designed with user-friendliness in mind, featuring an intuitive control panel that simplifies navigation and settings adjustments. The HP H4H3 also supports automatic duplex printing, reducing paper consumption and further promoting eco-friendly practices in the workplace.

In summary, the HP H4H3 stands out due to its impressive print quality, fast performance, numerous connectivity options, and strong security features. It is a reliable choice for businesses looking to enhance their printing capabilities while prioritizing efficiency and sustainability. Whether for everyday documents or high-stakes presentations, the HP H4H3 delivers exceptional results that meet the demands of modern work environments.