Friedrich Thermostat Manual for R410A Series

Friedrich Complete Thermostat Manual for Efficient Control of Air Conditioner Units

Low Voltage Interface Connections

All Vert-I-Pak units have a low voltage interface connector through which a Remote Wall Thermostat, Desk Control and Auxiliary Fan’s Relay can be connected. The interface connector is located on the electronic control board.

Figure 1 Interface Connector Location

Questions concerning proper connections to the unit should be dirrected to the factory.

Table 1

		Interface Connector Definitions
	FP	Factory use only.
		(Ensure there is no jumper at FP an F2)
	F2	Used with F1 to provide 24 VAC to external
	F2	fan relay. (Ensure there is no jumper at FP an F2)
		fan relay. (Ensure there is no jumper at FP an F2)
	F1	Used with F2 to provide 24 VAC to
	F1	external fan relay.
		external fan relay.
	D2	Used with D1 for desk control on or off
	D2	operation.

	D1	Used with D2 for desk control on or off
	D1	operation.

CCommon Ground Terminal

GH	Call for high fan

GL	Call for low fan

BCall for heat pump reversing valve Y Call for compressor

W Call for heating

R 24V Power from Electronic Control to Wall

Remote Wall Thermostat

All Friedrich Vert-I-Pak units are factory configured to be controlled by using a single stage heat/cool remote wired wall mounted thermostat.

Thermostat Selection

Friedrich recommends the use of the Friedrich RT4 and RT6. These thermostats are single stage heat/cool, manual changeover. The RT4 is a digital display thermostat with single speed fan control. The RT6 features a digital display, two fan speed selection, temperature limiting, status indicator light, room temperature offset, and backlight. Other thermostats may be used as long as they are single stage heat/cool and are configured correctly for the unit.

Thermostat terminals requirements:.

For cooling with electric heat units: C, R, G, Y, W.

For heat pump units: C, R, G, Y, W, B.

For two fan speeds, thermostat must have 2 fan speed selection.

HEAT PUMP UNITS

During Heat Mode:

The B terminal must be continuously energized. The W terminal must have 24 VAC output to call for heat. The control board decides on whether to turn on the Heat Pump Heat (compressor) or Electric Heat. The Y terminal should not have 24 VAC output during heat mode.

Connecting a Remote Wall Thermostat

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.

Connect the thermostat using Figure 1 and Table 1 as a guide.

Procedure (Ensure there is no jumper wire at FP and F2)

1)Disconnect power to the unit.

2)Unscrew and remove the electrical control box’s cover.

3)Locate the Interface Connector (24 VAC terminal strip (See figure 1 at left).

4)Make the wire connections according to the configuration needed for

your unit (see above or page 40 for wiring diagrams). Use #18 gauge wire size.

5)Once each wire is matched and connected, the unit is now ready to be controlled by the thermostat.

6)Reattach the electrical control box’s cover.

R410A 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.