Friedrich 920-087-09 (12/10) Digital Control User Input Configuration, Dip Switch Setting

Digital Control User Input Configuration

The adjustable control dip switches are located at the lower left hand portion of the digital Smart Center. The inputs are only visible and accessible with the front cover removed from the PTAC.

Dip Switch Setting

1.Emergency Heat Override – Switch 1

In the unlikely event of a compressor failure a heat pump unit may be switched to operate in only the electric heat mode until repairs can be made. Moving Dip Switch 1 to ‘ON’.

2.Wall Thermostat Switch 2

In order to enable the wall thermostat move Dip Switch to 'ON'.

3.Fan Cycle Control – Switch 3-4

All PTACs are shipped from the factory with Dip Switch 3-4 in the ‘OFF’ position. In this position the cooling fan cycle will run continuously providing air circulation during the warm months. The heating fan cycle is set to 'cycle' on and off. The fan may be set to 'continuous' mode by switching Dip Switch 3 to 'ON' position.

4.Electronic Temperature Limiting – Switches 5-6

The digital control is set from the factory to allow a temperature range between 61° F and 86° F in both heating and cooling mode. Dip Switches 5-6 can be used to set high and low limits for either heating both, cooling both or both.

From the factory switches are in the down 'OFF' position. The chart below shows the available electronic limiting ranges.

5.Room Freeze Protection – Switch 7

Units are shipped from the factory with the room freeze protection enabled. Room Freeze Protection can be switched off at the owner’s preference by moving Dip Switch 7 to ‘OFF’. This feature will monitor the indoor room conditions and in the event that the room falls below 40°F the unit will cycle on high fan with the electric heater. This occurs regardless of mode.

Figure 31

Dip Switches

DIP SWITCH

UP

1

2

3

4

5

6

7

DOWN

LOCATION OF

Freeze guard

DIP SWITCHES

ON UNIT

Setpoint Limit 2

Setpoint Limit 1

Fan CON/CYC for cooling

Fan CON/CYC for heating

Wall Thermostat enable

Electric heat only (for Heat Pumps)

FRP028

Switch

Description

Function

Factory Setting

Option

1

Emergency Heat Override

Enables electric heat only operation in the event of a com-

Down - Normal Operation

Up - Overrides compressor operation.

for PDH Heat Pump

pressor failure on HP models.

(PDH models only)

Models

2

Wall Thermostat Switch

Enables the use of a wall thermostat or unit controls

Down - Unit Controls

Up - Enables Wall Thermostat Usage

3

Fan Cycle for Heating

Allows selection of continuous fan or cycling in heating mode.

Down - Cycle

Up - Continuous

4

Fan Cycle for Cooling

Allows selection of continuous fan or cycling in cooling mode.

Down - Continuous

Up - Cycle

5

Setpoint Switch 1

Allows the temperature setpoint range to be adjusted.

Down

61F-86F

Up

63F-80F

Down

65F-78F

Up

68F-75F

6

Setpoint Switch 2

Down

(16C-30C)

Down

(18C-28C)

Up

(19C-26C)

Up

(20C-24C)

7

Room Freeze Protection

Allows the unit to ensure the indoor room temperature does

Down - Freeze Protection Enabled

Up - Freeze Protection Disabled

not fall below 40F even when turned off.

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