Emerson 1F85U-42NP (Non-Programmable) Installation and Operating Manual

Electrical Rating:

Battery Power ..................................... mV to 30 VAC, NEC Class II, 50/60Hz

Input-Hardwire .................................... 20 to 30 VAC, NEC Class II, 50/60 Hz

Terminal Load .......................................... 1.5 A per terminal, 2.5A 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

Terminal Designations

Terminal Function

RC

Power (24V) - Cooling

RH

Power (24V) - 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

1st 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

2nd Stage compressor

W2

2nd Stage Heat (Conventional)

2nd Stage Auxiliary Heat (Heat Pump)

Can operate as 1st Stage Auxiliary Heat

(See Installer Menu #15)

Installer Menu #

(Hold Menu  8 Seconds)

Description

Default Setting

(flashing icons)

Settings

(Press or Up or Down Key)

05

Outdoor Equipment: selects air conditioner (AC) or heat pump (HP) equipment as well as the number of stage

AC2

AC0

AC1

AC2

HP1

HP2

10

Indoor Equipment: selects whether the equipment is a gas furnace, electric furnace or fan only

EL2

FAN

GA1

GA2

EL1

EL2

15

Dedicated Emergency: W/E only operates in Emergency Aux mode. W2 becomes 1st stage Aux. Heat

OFF

On OFF

20

O,B or 3 Wire Zone Valve Selection

O

O

B 3

30   

Heat Cycle Rate: how often  the heat will turn on

MEd

SLO – slow

MEd – medium

FAS – fast

32

Aux Cycle Rate: how often the auxiliary heat will turn on

MEd

SLO – slow

MEd – medium

FAS – fast

35

Cool Cycle Rate: how often  the cooling will turn on

MEd

SLO – slow

MEd – medium

FAS – fast

50    

Compressor Lockout: protects the compressor  from short cycling

OFF

On – 5 minute delay OFF – no delay

65

Max Heat Limit: maximum set point for heat mode

99

47 to 99

66

Minimum Cool Limit: minimum set point for cool mode

45

45 to 97

79

Fahrenheit or Celsius

°F

°F – Fahrenheit

°C – Celsius

81     

Temperature Display Adjustment:

adjust the displayed “Room Temperature”

0

-5 to +5

83

Continuous Display Light: keep the backlight always on – “C” wire required

OFF

On  – always on

OFF – momentarily

88

Auto Changeover: thermostat automatically switches between heat and cool.

OFF

On  – enable auto OFF – disable auto

99  

Keypad Lock: prevent unwanted changes to the thermostat

OFF

On  – disable buttons

OFF – all buttons are active