IM 1068 / Page 16 of 32
Ventilation
The introduction of outside air is controlled by an automatic
damper. During normal operation, the damper will be open
whenever the Heat, Cool, or Fan control buttons are
depressed. If the indoor fan is not energized, the damper will
be closed.
A concealed cutoff switch is provided so that the damper
can be kept closed.
This switch is located at the front left-hand side of the
cooling chassis (Figure 12). It can be reached by removing
the front panel.
Remote Mounted Thermostat Installation
(Sizes 007–012 Only)
Units that are furnished with remote mounted thermostats
should be wired as shown in Figure 22. The connections for
eld wiring are on a seven-position terminal board located on
the face of the control box. Other considerations for remote
mounted thermostat are as follows:
1. If slave units are to be employed, remove the jumper
from terminals A to C of the slave unit. Connect terminal
A of the master unit to the corresponding terminal A of
the slave unit as shown in Figure 22.
The master unit is furnished with a 50 VA transformer
that is capable of handling up to 7 slave units. If
additional slave units are to be added, a larger eld
supplied transformer must be mounted external to the
unit. The master and slave units draw 5.6 VA each.
Furnish a transformer to handle the number of slaves
installed, plus the master unit.
2. When using a programmable wall thermostat, connect the
common terminal of the thermostat to terminal A of the
unit terminal board. Refer to the instructions furnished
with the thermostat to locate the common terminal.
Note: It may be necessary to reduce the number of
slave units connected to the master or eld supply
a larger transformer when using a programmable
thermostat.
Check the VA draw of the chosen thermostat, plus the
VA draw of the master and slave units to be sure the
total doesn’t exceed 50 VA power draw. Slave units are
connected as described in #1 above.
Figure 22: Remote Mounted Thermostat Wiring Connections
Manual Changeover Thermostat Automatic Changeover Thermostat
Thermostat Part No. 0046736101 Thermostat Part No. 0060685101
Subbase Part No. 0046742100 Subbase Part No. 0002005963
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