Emerson 1F85U-42PR - User Manual

PART NO.

37-7554B-EN

1535

1F85U-42PR

(Programmable)

Installation and Operating Instructions

80

Series

TM

Universal Thermostat

Battery Powered or Hardwired with Common

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emersonclimate.com

Thermostat Applications

Maximum

Stages

Heat/ Cool

Conventional Gas, Oil, Electric

(mV and

24

V), Heat only, Cool only or

Heat/Cool Systems

2/2

Heat Pump (Air Source or Geothermal)

with Aux. Heat

4/2

Thermostat Installation

2-4

Wiring

2

Installer Menu

3-4

Test Equipment

4

Using the Thermostat

5-7

Thermostat Overview

5

User Menu

6

Thermostat Operation

6

Thermostat Schedule

7

Troubleshooting

7-8

Homeowner Help Line

8

INDEX

MERCURY NOTICE:

This product does not contain

mercury. However, this product may replace a product

that contains mercury. Mercury and products containing

mercury must not be discarded in household trash.

Refer to www.thermostat-recycle.org for information

on disposing of products containing mercury.

Electrical Rating:

Battery Power .....................................

mV

to

30

VAC, NEC Class II,

50/60

Hz

Input-Hardwire ....................................

20

to

30

VAC, NEC Class II,

50

/

60

Hz

Terminal Load ..........................................

1.5

A per terminal,

2.5

A maximum all terminals combined

Setpoint Range ........................................

45°

to

99°

F (

7°

to

37° C)

Rated Differentials (@

6

°F/ Hr): Fast

Med

Slow

Heat (Conventional Gas / Oil / Elect) .....

0.5°F 0.75°F 1.9°F

Cool (Central Air) .................................

0

.

9°F 1.2°F 1.7°F

Heat Pump (Heat and Cool) ................

0

.

9°F 1.2°F 1.7°F

Heat Pump Aux. ..................................

0.5°F 0.75°F 1.9°F

Operating Ambient ..................................

32°F to +105°F (0° to +41°C)

Display Temperature Range ....................... 32°F to +99°F (0 to 37°C)

Operating Humidity .................................

90

% non-condensing maximum

Shipping Temperature Range ...................

-20

°F to +

150

°F

(-29° to +65°C)

Thermostat Dimensions ...........................

3-3/4” H x 6” W x 1-1/8” D

SPECIFICATIONS

Optional Accessory: Wall Cover-Up Plate

F61-2663

,

6-3/4

” W x

4-1/2

” H

Terminal Designations

Terminal Function

RC

Power (

24

V) - Cooling

RH

Power (

24

V) - Heating

O/B

6 (not shown) -

3

wire zone valve

Reversing Valve or output for

3

wire zone valves

Configurable as “O” or “B” Reversing Valve or 3 wire

zone heat (power close)

Y

1

st Stage Compressor

G

Fan Relay

W/E

1st

Stage Heat (conventional);

1st

Stage Auxiliary Heat (heat pump)

Can operate as Emergency Heat only

(See Installer Menu

#15)

C

Common wire for

24V

(optional with batteries)

L

Heat Pump Malfunction / Diagnostic terminal

(input signal requires common)

Y2

2

nd Stage compressor

W

2

2

nd Stage Heat (Conventional)

2

nd Stage Auxiliary Heat (Heat Pump)

Can operate as

1

st Stage Auxiliary Heat

(See Installer Menu #

15

)

WIRING

Refer to equipment manufacturer’s instructions for specific system wiring information. After wiring, see

INSTALLER MENU for proper thermostat configuration. Wiring table shown are for typical systems and

describe the thermostat terminal functions. Wiring will change when dedicated emergency heat is on

(See Installer menu #

15).

THERMOSTAT INSTALLATION

Precautions

• Do not exceed the specification ratings.

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

• This control is a precision instrument, and should be handled carefully. Rough handing or

distorting components could cause the control to malfunction.

WARNING

!

Do not use on circuits exceeding specified voltage.

Higher voltage will damage control and could

cause shock or fire hazard.

Do not short out terminals on gas valve or primary

control to test. Short or incorrect wiring will burn

out thermostat and could cause personal injury

and/or property damage.

CAUTION

!

To prevent electrical shock and/or equipment

damage, disconnect electrical power to system,

at main fuse or circuit breaker box,until

installation is complete.

Leveling Thermostat
Leveling is for appearance only and
will not affect thermostat operation.

CAUTION

!

To prevent compressor and/or property damage, if the outdoor temperature is below

50°

F,

DO NOT operate the cooling system.

Do not allow the compressor to run unless the compressor oil heaters have been operational

for

6

hours and the system has not been operational for at least

5

minutes.

2