Friedrich 000 BTU'S Manual Do Utilizador

12

Desk Control Terminals

The Friedrich VERT-I-PAK has built-in provisions for 

connection to an external switch to control power to the unit. 

The switch can be a central desk control system or even a 

normally open door switch.
For desk control operation, connect one side of the switch to 

the D1 terminal and the other to the D2 terminal (See figure 9).

Whenever the switch closes, the unit operation will stop.

Maximum Wire Length for Desk Control Switch

  Wire Size 

Maximum Length

 

#24 

400 ft.

 

#22 

600 ft.

 

#20 

900 ft.

 

#18 

1500 ft.

 

#16 

2000 ft.

Auxiliary Fan Control

The Smart Center also has the ability to control a 24VAC 

relay to activate an auxiliary, or transfer, fan. The outputs 

are listed as F1 and F2 on the control board.
To connect the relay, simply wire one side of the relay to 

F1 and the other side to F2. Anytime that the fan runs, the 

terminals will send a 24VAC signal to the relay. The relay 

must be 24 VAC, 50mA or less.
Note: The relay and auxiliary fans must be field supplied.

Note: The desk

control system and 

switches must be 

field supplied.

Thermostat Connections

Thermostat Configuration

  C  =  Common Ground
  W  =  Call for Heating
  Y  =  Call for Cooling
  R  =  24V Power from Unit
 GL  =  Call for Fan (Low Speed)
 GH  =  Call for Fan (High Speed)
  B  =  Reversing Valve Energized in heating mode

*If only one G terminal is present on thermostat, connect 

to GL for low fan or to GH for high fan operation.

NOTE: It is the installer’s responsibility to ensure that all 

control wiring connections are made in accordance with 

the Freidrich installation instructions.  Improper connec-

tion of the thermostat control wiring and/or tampering with 

the unit’s internal wiring can void the equipment warranty. 

Questions concerning proper connections to the unit 

should be directed to the factory: 210-357-4400.

An improperly configured t-stat can be the 

cause of improper operation. Ensure to 

correctly configure the t-stat (see owner’s 

manual).