Remote Thermostat and Low Voltage Control Connections (Continued)

Thermostat Connections

C

=

Common Ground

W

=

Call for Heating

Y

=

Call for Cooling

R

=

24V Power from Unit

GL

=

Call for Fan (Low Speed)

GH

=

Call for Fan (High Speed)

B

=

Reversing Valve Energized in heating mode

*If only one G terminal is present on thermostat, connect to GL for low fan or to GH for high fan operation.

NOTE: It is the installer’s responsibility to ensure that all control wiring connections are made in accordance with the Freidrich installation instructions. Questions concern- ing proper connections to the unit should be directed to the factory: 210-357-4400.

Desk Control Terminals

The Friedrich VERT-I-PAK has built-in provisions for connection to an external switch to control power to the unit. The switch can be a central desk control system or even a normally open door switch.

For desk control operation, connect one side of the switch to the D1 terminal and the other to the D2 terminal. Whenever the switch closes, the unit operation will stop.

Maximum Wire Length for Desk Control Switch

Wire Size

Maximum Length

 

#24

400 ft.

 

#22

600 ft.

Note: The desk

#20

900 ft.

 

 

control system and

#18

1500 ft.

switches must be

#16

2000 ft.

field supplied.

Auxiliary Fan Control

The Smart Center also has the ability to control a 24VAC relay to activate an auxiliary, or transfer, fan. The outputs are listed as F1 and F2 on the control board.

To connect the relay, simply wire one side of the relay to F1 and the other side to F2. Anytime that the fan runs, the terminals will send a 24VAC signal to the relay. The relay must be 24 VAC, 50mA or less.

Note: The relay and auxiliary fans must be field supplied.

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Friedrich H)A24K75L, R410A, H)A12K25L, H)A09K34L, H)A24K25L, H)A12K50L, H)A12K34L, H)A24K10L, H)A24K34L Thermostat Connections

H)A09K25L, H)A12K50L, H)A09K50L, H)A24K10L, H)A24K25L specifications

Friedrich R410A is a refrigerant blend that has become a cornerstone in the HVAC industry, particularly for air conditioning systems. This hydrofluorocarbon (HFC) is known for its efficiency and environmentally friendly properties, making it a popular alternative to older refrigerants like R22.

One of the main features of R410A is its exceptional thermal efficiency. It has a higher cooling capacity compared to R22, which allows for smaller and more efficient equipment. This efficiency translates to reduced energy consumption and lower operating costs for users. Additionally, the higher pressure capability of R410A enables the design of more compact systems, which is particularly beneficial for residential and commercial applications where space is often limited.

R410A is characterized by its zero ozone depletion potential (ODP), which is a significant advantage over its predecessors. This makes it a more environmentally responsible choice, aligning with global initiatives to phase out substances that harm the ozone layer. However, it is essential to note that while R410A does not deplete the ozone, it does have a global warming potential (GWP) of approximately 2,088, making it less favorable in terms of climate impact compared to natural refrigerants.

In terms of technology, R410A is typically utilized in systems that are designed specifically for this refrigerant. Equipment compatible with R410A often features advanced components that can handle the higher pressures required. Many modern air conditioning systems equipped with R410A also incorporate variable-speed compressors and advanced electronic controls, enhancing overall performance and comfort.

Additionally, R410A systems often come equipped with variable refrigerant flow (VRF) technology, which allows for precise temperature control in multiple zones of a building. This versatility makes R410A an ideal choice for both residential and commercial installations, providing optimal comfort throughout various spaces.

In summary, Friedrich R410A stands out due to its high energy efficiency, zero ozone depletion potential, and suitability for modern HVAC technologies. As the industry moves towards more sustainable practices, R410A serves as a reliable refrigerant that balances performance with environmental responsibility. It’s a significant choice for anyone looking to invest in efficient and eco-friendly heating and cooling solutions.