CONFIGURATION

SWITCHES

RESET SWITCH

See the Troubleshootingsection at the end of this document for more information about

the function of this switch.

E2/P SWITCH (DHM) TERMINAL FUNCTION

The

E2/P

 

switch is located on the back of

 

the thermostat body (see fig. 2). This switch

 

controls how the

DHM

terminal will be

energized.

 

 

 

 

1. In the

P

position (up) the

DHM

terminal will

be energized on a call for dehumidification.

 

2. In the

E2

position (down) the

DHM

terminal

will always be energized except on a call for

 

dehumidification. The switch must be in the

E2

position on some electronically controlled

 

variable speed blower systems.

 

 

1

S18

2

P S19

E2

1Reset switch

2E2/P switch

Figure 2. Switch locations on back of thermostat body

DEHUMIDIFICATION WIRING WITHOUT AN ELECTRONICALLY CONTROLLED VARIABLE SPEED BLOWER SYSTEM FOR SINGLE STAGE COMPRESSOR SYSTEM ONLY

If you have a single stage compressor system see the diagram below. A relay (customer provided) should be installed as shown in Fig. 5 to switch the fan speed to the next lower speed on a call for dehumidification from the thermostat. The reduction in air flow allows the coil to remove more humidity from the air. The relay should be rated for blower motor load. Since this configuration reduces the air flow in cooling, the anti- freeze-up control (White-Rodgers CAFC) or equivalent is recommended. The CAFC prevents the air conditioning coil from freezing due to low air flow, dirty filters, low refrigerant pressure, etc. The CAFC snaps onto the suction line close to the evaporator coil as possible and breaks the compressor circuit when the suction line drops below 38° F and re-make the circuit at 46° F.

NOTE: If you have a two stage compressor, the thermostat software will lengthen cycle times for the first stage of cool. The longer cycles will improve dehumidification while cooling, allowing the DHM terminal not to be used on a two stage compressor system.

Selecting P - DHM Energizes on call for

P

Dehumidification

Selecting E2 - DHM Deenergizes on call for Dehumidification

E2

R

C

Y1

G

DHM

N.C.

N.O.

Customer supplied relay rated for blower motor load

Cool Fan Speed

 

HIGH

 

MED. HIGH

3-4 speed

 

LOW

Blower

 

Motor

 

 

COMMON

 

 

 

Furnace

Speed

Control

Fan

Module

Heat

 

HOT

24VAC

NEUTRAL

120 VAC

TRANSFORMER

Figure 3. Typical Wiring for Dehumidifier System

HM

 

 

R

 

 

 

 

 

 

Relay

 

 

 

 

 

 

 

 

 

HOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90-290Q

 

 

 

 

 

 

 

 

 

 

 

 

or equivalent

24 VAC

 

 

 

 

I

 

 

NEUTRAL

120 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

Humidifier

120 VAC

 

 

NEUTRAL

 

 

 

System

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 4. Typical Wiring for 120V Humidifier System

Typical Wiring for 120V Humidifier System

HMR

 

 

 

 

 

 

 

 

 

 

 

 

Humidifier

 

 

 

 

 

 

 

 

 

 

System

24 VAC

 

 

 

 

I

 

 

HOT

120 VAC

 

 

 

 

 

 

 

 

NEUTRAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

Typical Wiring for 24V Humidifier System

Figure 5. Typical Wiring for 24V Humidifier System

4

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White Rodgers 1F95-391 specifications Switches, Reset Switch, E2/P Switch DHM Terminal Function, Dhm

1F95-391 specifications

The White Rodgers 1F95-391 is an advanced thermostat that stands out in the market for its user-friendly design, superior functionality, and energy-saving capabilities. Specifically tailored for both residential and light commercial applications, this programmable device is engineered to provide optimal climate control while enhancing energy efficiency.

One of the key features of the 1F95-391 is its large, easy-to-read display. The backlit LCD screen allows for simple navigation even in low-light conditions, ensuring you can adjust the temperature settings with ease. The interface is intuitive, allowing users to quickly familiarize themselves with its functionalities.

This thermostat supports a wide range of heating and cooling systems, making it versatile for various setups, including gas, oil, and electric systems. Its compatibility with both single-stage and multi-stage heating and cooling systems further aids in its adaptability, catering to different home environments.

Energy conservation is a hallmark of the 1F95-391. The programmable scheduling allows users to create customized temperature settings that align with their daily routines. This feature can significantly reduce energy consumption by allowing the system to operate at lower settings when occupants are away or sleeping, leading to substantial cost savings on utility bills over time.

The 1F95-391 also integrates advanced technologies such as Adaptive Intelligent Recovery, which learns how long it takes to reach the desired temperature and adjusts the heating or cooling accordingly. This means that the home maintains comfort while optimizing energy use, eliminating the need for excessive manual adjustments.

Moreover, the thermostat's filter change reminder ensures that users are alerted when it's time to replace or clean the HVAC filter. This feature not only helps maintain the air quality in the home but also extends the lifespan of the HVAC system by ensuring it operates efficiently.

In addition to its operational features, the White Rodgers 1F95-391 boasts reliability and durability. Constructed with high-quality materials, it is designed to withstand the test of time and provide consistent performance, making it a sound investment for any property owner.

Overall, the White Rodgers 1F95-391 represents a significant advancement in smart temperature control, combining functionality, efficiency, and ease of use. Whether upgrading an existing thermostat or installing a new one, consumers can expect enhanced comfort and reduced energy costs.