White Rodgers 1F95-391 User Manual

INSTALLATION

DESCRIPTION

WHITE-RODGERS 90 SERIES

1F95-391

MULTI-STAGE/HEAT PUMP INSTALLATION/CONFIGURATION

This White-Rodgers Digital Thermostat uses microcomputer technology to provide precise time, humidity, and temperature control. This thermostat offers the flexibility to design

SPECIFICATIONS

1F95-391: 7 Day programming; residen-

tial applications.

ELECTRICAL DATA

Electrical Rating:

20 to 30 VAC, 50/60 Hz with common

0.05 to 1.5 Amps per terminal

2.5 Amps maximum total load (all terminals combined). Hardwired only. C terminal is required.

PRECAUTIONS

WARNING

Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage.

Do not use on circuits exceeding specified voltage. Higher voltage will damage thermostat and could cause shock or fire hazard.

Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.

heating and cooling programs that fit building needs. This thermostat is adaptable to most 24 volt residential forced air multi-

Standard Systems:

Multi-stage gas, oil, electric.

Single-stage or two-stage compressor

heat pump.

THERMAL DATA

Setpoint Temperature Range:

45° to 99°F (7° to 37°C)

CAUTION

To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete.

NOTE

Read all instructions thoroughly before beginning installation.

This thermostat is intended for use with a low voltage system. Do not use on a line voltage system.

stage or heat pump systems with electric or fossil fuel auxiliary.

Operating Ambient Temperature:

32° to 110°F (0° to 43°C)

Operating Humidity Range:

90% non-condensing max.

Shipping Temperature Range:

-4° to 149°F (-20° to 65°C)

Do not exceed ratings shown in the Specifications section, above. If in doubt about the electrical ratings of your heating/cooling system, have it inspected by a qualified heating and air conditioning contractor or licensed electrician.

All wiring must conform to local and national electrical codes and ordinances.

This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.

White-Rodgers is a division

of Emerson Electric Co.

www.white-rodgers.com

Part No. 37-6527B

Replaces 37-6527A

0443

INSTALLATION

ATTENTION!

This product does not contain mercury. However, this product may replace a unit which contains mercury.

Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury with sand or other absorbent material and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded.

Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container and return to White-Rodgers at 2895 Harrison Street, Batesville, AR 72501 for proper disposal.

REMOVE OLD THERMOSTAT

Shut off electricity at main fuse or circuit breaker box until installation is complete AND the new thermostat is configured properly.

Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall.

Identify each wire attached to the thermostat using one of the labels enclosed with the

new thermostat. Disconnect the wires from the old thermostat

one at a time. DO NOT let the wires fall back into the wall.

Install the new thermostat using the following procedures.

ATTACH BASE TO WALL

Remove packing material from the thermostat. Place fingers of one hand on the center top and bottom portion of the thermostat. Grasp the base in the other hand on top and bottom center and gently pull straight out. Forcing or prying on the thermostat will cause damage to the unit.

Place the base over the hole in the wall where the wires come out and mark mounting hole locations using the base as a template. Drill

⁄16” pilot holes, and install

screw anchors in the wall. Run wires through hole in base and attach

base to wall (see fig. 1). Insert the wires into the terminals on the base

using the appropriate wiring diagram and tighten the terminal screws.

CONFIGURING AND PROGRAMMING

The thermostat must be configured to operate properly with the system. See the CONFIGURATION section of this manual.

This thermostat can be programmed for automatic temperature control. Refer to Operating Instructions for programming.

Mounting screws

Pull wires through this opening

Insert wires into terminal holes, then tighten screws

Screw anchors

Jumper connections for remote sensor power

(Do not remove)

Figure 1. Thermostat base and terminals

MULTI-STA GE TERMINAL OUTPUTS

Refer to equipment manufacturers’ instructions for specific system wiring information.

You can configure the thermostat for use with either multi-stage electric heat systems or multi-stage gas systems. When configured for electric heat, the G terminal (blower/fan) will be energized on a call for heat, using the installer table (pgs. 5 & 6).

THERMOSTAT TERMINALS (Upper)

L SA SB SC OT

Malfunction Light Remote Sense A Remote Sense B Remote Sense C Outdoor Sensor

SYSTEM C R HM W2 DHM E/W1 Y2 Y1 B O G

Multi-Stage

24 Volt

(Common)

24 Volt

(Hot)

Energizes on a

call for heat if

Humidity setpoint is

above room

humidity.

This thermostat is designed to operate a single-transformer system. If you have a twotransformer system, cut and tape off one transformer. If transformer safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits. If required, replace remaining transformer with a 75VA Class II transformer. After disconnecting one transformer, the two commons must be jumpered together.

THERMOSTAT TERMINALS (Lower)

Heat mode

2nd stage

E2/P switch in the P position,

Energizes on a call for

Dehumidification.

E2/P switch in E2 position,

De-energizes on a

call for Dehumidification.

Heat mode

1st stage

Cool mode

2nd stage

Use the terminal output information below to help you wire the thermostat properly for your multi-stage system. After wiring, see CONFIGURATION section for proper thermostat configuration.

Cool mode

1st stage

Energized in Heat

and Off Mode

Energized in

Cool Mode

Blower/Fan

Energized on

call for Cool (and Heat if configured

to Electric Heat).

HEAT PUMP TERMINAL OUTPUTS

Refer to equipment manufacturers’ instructions for specific system wiring information.

You can configure the thermostat for use with the following heat pump system types:

HEAT PUMP TYPE 1. Single-stage compressor system; gas or electric backup.

HEAT PUMP TYPE 2. Multi-stage or twocompressor system; gas or electric backup.

Use the terminal output information below to help you wire the thermostat properly for your heat pump system type. After wiring, see CONFIGURATION section for proper thermostat configuration.

commons must be jumpered together.

THERMOSTAT TERMINALS (Upper)

L SA SB SC OT

Malfunction Light Remote Sense A Remote Sense B Remote Sense C Outdoor Sensor

THERMOSTAT TERMINALS (Lower)

SYSTEM C R HM W2 DHM E/W1 Y2 Y1 B O G

Single-stage compressor system; gas or electric backup

Heat Pump 1

Multi-stage or two compressor system; gas or electric backup

Heat Pump 2

24 Volt

(Common)

24 Volt

(Common)

24 Volt

(Hot)

24 Volt

(Hot)

Energizes on a

call for heat if

Humidity setpoint is

above room

humidity.

Energizes on a

call for heat if

Humidity setpoint is

above room

humidity.

Heat mode

3rd stage,

Emergency Mode

2nd stage

Emergency Mode

2nd stage

E2/P switch in P position,

Energizes on a call for

Dehumidification.

E2/P switch in E2 position,

De-energizes on a

call for Dehumidification.

E2/P switch in P position,

Energizes on a call for

Dehumidification.

E2/P switch in E2 position,

De-energizes on a

call for Dehumidification.

Heat mode 2nd stage,

Emergency Mode

1st stage

Heat mode

3rd stage,

Emergency Mode

1st stage

No Output

Heat and

Cool mode

2nd stage

(compressor 2)

Heat and

Cool mode

1st stage

(compressor 1)

Heat and

Cool mode

1st stage

(compressor 1)

Energized in Heat,

Off, Emergency

Mode

Energized in Heat,

Off, Emergency

Mode

Energized in

Cool Mode

Energized in

Cool Mode

Blower/Fan

Energized on

call for Heat and Cool

Blower/Fan

Energized on

call for Heat and Cool

CONFIGURATION

SWITCHES

RESET SWITCH

See the Troubleshooting section at the end of this document for more information about the function of this switch.

E2/P SWITCH (DHM) TERMINAL

S18

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.

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 antifreeze-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.

Reset switch

E2/P switch

Figure 2. Switch locations on back of thermostat body

S19

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

Dehumidification

Selecting E2 - DHM Deenergizes on call for

Dehumidification

CRG

DHM

N.C.

Customer supplied relay rated for blower motor load

N.O.

24VAC

TRANSFORMER

Cool Fan Speed

Furnace Control Module

MED. HIGH

Heat Fan Speed

HIGH

3-4 speed Blower

LOW

Motor

COMMON

HOT

120 VAC

NEUTRAL

Figure 3. Typical Wiring for Dehumidifier System

Relay 90-290Q or equivalent

Humidifier

System

Figure 4. Typical Wiring for 120V Humidifier System

HOT

NEUTRAL

120 VAC

Typical Wiring for 120V Humidifier System

24 VAC

TRANSFORMER

HOT

NEUTRAL

120 VAC

Humidifier

System

Typical Wiring for 24V Humidifier System

Figure 5. Typical Wiring for 24V Humidifier System

24 VAC

TRANSFORMER

HOT

NEUTRAL

120 VAC

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