Troubleshooting - Emerson 1F95-1277 Installation And Operating Instructions Manual

Blue universal touchscreen thermostat with automatic heat/cool changeover option

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Averaging or Weighting Remote Sensors

The thermostat will weight or average the temperature of the

indoor remote sensor with the local sensor in the thermostat

for each program period. The averaging will be active only

when the local sensor and the indoor remote sensor are both

functional and enabled in the Installer/Configuration menu.

When the thermostat is in the Set Schedule mode, the weight

of the indoor sensor will be shown in the current temperature

digits of the display. The weight will show as A2 (average and

default), H4 (high) or L1 (low). Pressing the

the same time will change the weight for the program period.

The weight of the thermostat sensor is fixed.

In normal operation of the thermostat, the current

temperature displayed will be the weighted average of the

local sensor and the remote sensor using the formula (local

sensor weight x local sensor temperature) + (remote sensor

weight x remote sensor temperature) / (local sensor weight +

remote sensor weight).

Example: Local sensor temperature is 80° and the remote

sensor is 70°.

If weight is selected H4, the averaged temperature of 72° will

be displayed.

(1 x 80) + (4 x 70) / 5 = 72°

If weight is selected A2, the average temperature of 73° will

be displayed.

(1 x 80) + (2 x 70) / 3 = 73.3°

If weight is selected L1, the average temperature of 75° will

be displayed.

(1 x 80) + (1 x 70) / 2 = 75°

The example shows that the weight selected would prioritize

the overall averaged temperature between the two sensors.

The high weight selection caused the remote sensor to have

a higher influence in the calculated temperature average than

the local sensor and the low weight selection caused the

remote sensor to have less influence.

Comfort Alert Codes

The Comfort Alert diagnostics product monitors the air con-

ditioning outdoor systems with single phase Copeland Scroll

compressors. Abnormal system and electrical conditions are

indicated by flashing ALERT codes on the yellow LED on the

Comfort Alert module. The flash codes are transmitted to the

thermostat by the Comfort Alert Thermostat interface module.

The Comfort Alert compatible thermostat displays "Call For

Service" that flashes at the same rate as the yellow LED on

the Comfort Alert module.

When the thermostat is configured for Heat Pump mode

and the Dual Fuel feature is selected on, the thermostat can

monitor the outside temperature using remote sensor F145-

1378 or use software logic to determine when to switch to gas

heat and shut down the compressor. This eliminates the need

for a fossil fuel kit.

The user selectable temperature is called the dual fuel

temperature setpoint, dF and is set in the Installer/

and

keys at

Configuration menu, items 33 or 34. With outdoor remote

sensor installed and enabled, the dual fuel temperature

setpoint (menu item 33) can be set to a temperature of -5°

through 50°. When outdoor remote sensor is not installed,

a software logic based dual fuel number (menu item 34)

from 01 to 09 can be selected. A higher temperature or dual

fuel setting will provide a smaller stage separation between

the heat pump and Aux to give more comfort. A lower

temperature or number will provide a larger stage separation

for more economy.

After the dual fuel temperature setpoint is set and

pressed, a delay, Cd, can be set for compressor shutdown

after the auxiliary stage is energized. This delay can be set

from 0 seconds to 99 seconds to minimize the time that the

system may blow cooler air until the alternate source of heat

comes on. Default setting for delay is 60. When setting the

delay, if the

will increase or decrease at the rate of one degree every half

second for the first three seconds and double the speed after

three seconds.

Requires DHM connection from thermostat to heat pump

system. Air to air heat pumps use a fast fan speed to circulate

warm air for first stage heating. As outdoor temperatures

drop, the heat pump produces less heat and a high fan speed

makes the air from the ducts feel cooler. Blower Balance

Point allows you to select an outdoor temperature to slow

the fan speed so the air from the duct feels warmer. Select

an outdoor temperature where the air from the ducts starts

to feel cool (Installer Configuration Menu item 37). When

the outdoor temperature drops to the selected temperature,

the thermostat will slow the fan speed so the outlet air feels

warmer.

PROGRAMMING

Dual Fuel Temperature Setpoint

keys are held depressed, the setpoint

Blower Balance Point for Heating