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コントロールユニット Emerson 47D01U-843のPDF 取付説明書をオンラインで閲覧またはダウンロードできます。Emerson 47D01U-843 8 ページ。 Universal heat pump defrost control

Short Cycle Time

At power-up as well as any time the compressor is de-energized, the control will activate a short cycle

delay. During this delay the compressor will not be energized, even if a call for compressor operation is

present. This is to prevent compressor damage due to rapid on and off cycling. Normal operation will

resume when the delay expires.

Default Short cycle setting (SS) is at least 5 minutes. Selecting a shorter time could potentially shorten

the life of the equipment.

Reversing Valve Shift Delay

This feature is used to limit potential noise issues on some compressors whenever the unit switches the

reversing valve going in/out of the defrost cycle.

The reversing valve Shift Delay (Sd) is defaulted at 30 seconds.

Integrated Outdoor Thermostat Functionality (Optional). Aux Heat Lockout/Low Temp.

Compressor Cutout.

Referencing Wiring Table (page 3)

Allows selection of an auxiliary heat cutout temperature (Aux Heat Lockout temperature). A user select-

able low temperature cutout setting for the compressor can also be selected to prevent the compressor

from operating below desired temperatures.

• Connection must be made from the indoor thermostat AUX to the Win located on the 47D01U-843

board.

• Select an Aux lockout temperature from the menu (hL).

• Select compressor lockout temperature from the menu (Lt).

Brownout Random Time Start Delay

At power-up and when the 47D101U-843 recovers from a brownout, a random time start delay of 5-90

seconds will be activated. This delay is in addition to the short cycle delay. During this delay the compres-

sor will not be energized, even if a call for compressor operation is present. The random start delay can

help reduce spikes in power consumption when multiple loads are re-energized after a blackout or brown-

out. The random time start delay is only active at initial power-up when recovering from a brownout.

Normal compressor cycling will not activate the random start delay.

Random Time Start Delay (Rt) can be disabled by setting to the OFF position.

Brownout Protection

Brownout protection will de-energize the compressor and fan if the control voltage drops below 15.5V for

more than 4 seconds during a call for compressor operation. Compressor operation will not resume until

the control voltage returns to a minimum of 17.5V.

Brownout protection (Bo) can be disabled by setting to the off position (of).