Bosch SM070 Specifications download pdf (Page 31)

100

Electrical | 31SM Series Heat Pump

6 720 220 406 (2013/9)Revised 08-13

• Evaporator freeze protection sensor, mounted

after the thermal expansion device and the

evaporator, monitors refrigerant temperature

between the evaporator coil and thermal

expansion valve. If temperature drops below or

remains at freeze limit trip for 30 seconds, the

controller will shut down the compressor and

enter into a soft lockout condition. The default

freeze limit trip is 30°F. (Figure#97)

Figure # 97

• The condensate overflow protection sensor is

located in the drain pan of the unit and

connected to the ‘COND’ terminal on the UPM

board. (Figure #94)

Figure # 98

The UPM Board includes the following features:

• ANTI-SHORT CYCLE TIMER: 5 minute delay on

break timer to prevent compressor short cycling.

• RANDOM START: Each controller has an unique

random start delay ranging from 270 to 300 seconds

on initial power up to reduce the chance of multiple

unit simultaneously starting at the same time after

power up or after a power interruption, thus

avoiding creating large electrical spike.

• LOW PRESSURE BYPASS TIMER: If the

compressor is running and the low pressure switch

opens, the controller will keep the compressor ON

for 120 seconds. After 2 minutes if the low pressure

switch remains open, the controllers will shut down

the compressor and enter a soft lockout. The

compressor will not be energized until the low

pressure switch closes and the anti-short cycle time

delay expires. If the low pressure switch opens 2-4

times in 1 hour, the unit will enter a hard lockout. In

order to exit hard lockout power to the unit would

need to be reset.

• BROWNOUT/SURGE/POWER INTERRUPTION

PROTECTION: The brownout protection in the

UPM board will shut does the compressor if the

incoming power falls below 18 VAC. The compressor

will remain OFF until the voltage is above 18 VAC

and ANTI-SHORT CYCLE TIMER (300 seconds) times

out. The unit will not go into a hard lockout.

UPM Board Factory Default Settings

TEMP

30°F

LOCKOUT

RESET

ALARM

PULSE

TEST

UPM DIP SWITCH DEFAULT POSITION

lockout 42

reset

alarm

Cont pulse

test

yes no

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 99 100

Comments to this Manuals

No comments

Bosch SM070 Specifications Page 31

Comments to this Manuals

Related products and manuals for Heat pumps Bosch SM070