Friedrich 920-087-09 ユーザーズマニュアル

23

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.

1

Emergency Heat Override 

for PDH Heat Pump 

Models

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

pressor failure on HP models.

Down - Normal Operation

Up - Overrides compressor operation. 

(PDH models only)

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 
not fall below 40F even when turned off.

Down - Freeze Protection Enabled

Up - Freeze Protection Disabled

FRP028

LOCATION OF
DIP SWITCHES
ON UNIT

1

2

3

4

5

6

7

Freeze guard

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)

UP

DOWN

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’.

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

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.

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.

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.