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ELECTRIC SHOCK HAZARD
WARNING
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Low Voltage Interface Connections
All Vert-I-Pak units have a low voltage interface connector through
which a Remote Wall Thermostat, Desk Control and Auxiliary Fan’s
Relay can be connected. The interface connector is located on the
Questions concerning proper connections to the unit should be dirrected
to the factory.
electronic control board.
Interface Connector Definitions
Interface Connector LocationFigure 1
Table 1
FP
F2
F1
D2
D1
C
GH
GL
B
Y
W
R
Factory use only.
(Ensure there is no jumper at FP an F2)
Used with F1 to provide 24 VAC to external
fan relay. (Ensure there is no jumper at FP an F2)
Used with F2 to provide 24 VAC to
external fan relay.
Used with D1 for desk control on or off
operation.
Used with D2 for desk control on or off
operation.
Common Ground Terminal
Call for high fan
Call for low fan
Call for compressor
Call for heating
24V Power from Electronic Control to Wall
Call for heat pump reversing valve
Remote Wall Thermostat
All Friedrich Vert-I-Pak units are factory configured to be controlled by
using a single stage heat/cool remote wired wall mounted thermostat.
Thermostat Selection
Friedrich recommends the use of the Friedrich RT4 and RT6. These
thermostats are single stage heat/cool, manual changeover. The RT4 is a
digital display thermostat with single speed fan control. The RT6 features
a digital display, two fan speed selection, temperature limiting, status
indicator light, room temperature offset, and backlight. Other thermostats
may be used as long as they are single stage heat/cool
and are
configured correctly for the unit.
Th
ermostat terminals requirements:
.
For cooling with electric heat units: C, R, G, Y, W.
For heat pump units: C, R, G, Y, W, B.
For two fan speeds, thermostat must have 2 fan speed selection.
During Heat Mode:
HEAT PUMP UNITS
The B terminal must be continuously energized. The W terminal must have
24 VAC output to call for heat. The control board decides on whether to
turn on the Heat Pump Heat (compressor) or Electric Heat. The Y terminal
should not have 24 VAC output during heat mode.
Connect the thermostat using Figure 1 and Table 1 as a guide.
Procedure (Ensure there is no jumper wire at FP and F2)
1) Disconnect power to the unit
.
2) Unscrew and remove the electrical control box’s cover.
3) Locate the Interface Connector (24 VAC terminal strip (See figure 1 at left).
4) Make the wire connections according to the con figuration needed for
your unit (see above or page 40 for wiring diagrams). Use #18 gauge wire size.
5) Once each wire is matched and connected, the unit is now ready to be
controlled by the thermostat.
6) Reattach the electrical control box’s cover.
Connecting a Remote Wall
Thermostat
12