Friedrich WallMaster WCVT12B30A handleiding

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Friedrich

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OPERATION

Unit Heat Control Operation - Heat Pump With Electric Heat (Continued)

Automatic Emergency Heat

If the sealed system fails with a bad reversing valve or anything that causes the indoor coil to get colder than the indoor ambient

temperature:

1) If the indoor coil thermistor senses a 5 degree temperature drop as compared to the ambient temperature thermistor and this

lasts up to 5 minutes, the control board will switch the unit to electric heat and continue heating with it.

Note: It is Ok to continue to use the unit with the electric heater until the heat pump is repaired.

Heat Control Operation - Electric Heat Only

When in the Heat mode, with and without Fan Mode Auto (Fan cycling):

If the indoor ambient temperature is below the Heat Demand Threshold (Heat Set Point minus 1.5 ˚F), turn on electric heat. If Ambient

is 0.3 ˚F above the Heat Set Point turn off the electric heat.

System Mode Auto

This mode provides automatic change over between cool and heat. The auto mode runs based on the indoor ambient temperature vs.

the Demand Thresholds. It is only available in Heat-Cool Unit.

Notes:

There is a buffer zone between the cool and heat set points where no heating or cooling is allowed to occur. It is critical that the Cool

Demand Threshold be greater than the Heat Demand Threshold by a minimum of 3° while in the Auto System Mode. For example,

if a user enters a value for the Auto Cooling Set Point that violates the minimum delta 3° rule, the Auto Heating Set Point will adjust

accordingly.

Automatic Change Over Delay (Cool with Heat Units)

The change over delay ensures that any system heating or cooling over shoot does not trigger an opposite demand cycle. The change

over delay = 15 min. This timer blocks the opposite demand cycle from running until the timer expires. As an example, if the last

demand was a cool cycle, and another cool cycle is requested, the timer will not block the request. However, if the last demand cycle

was a cool cycle, and heat cycle is requested, the timer will block the request until the change over delay is expired.

Compressor Lock Out Time

The lockout feature ensures that the compressor is de-energized for a period of time. The timer varies randomly from 180 to 240

seconds

The compressor lockout is initiated every time the compressor is “off” due to:

(1) Satisfying the temperature set point

(2) Changing mode to fan only or heat

(3) Turning the unit off

(4) Control is rst plugged in or power is restored after failure

(5) Line power is restored from a brown out condition

Cooling Fan Delay

Fan cycle/Auto mode only

When unit cycles cooling ON – starts the fan 5 seconds EARLY. When unit cycles cooling OFF – DELAYS the fan off for 30 seconds.

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