9
optional outdoor thermostat
An outdoor thermostat can be installed in the field with 2-stage
electric heat. To install the outdoor thermostat, remove the
orange wire from the E terminal on the terminal block, and
connect to the outdoor thermostat. Connect the other side
of the outdoor thermostat to
W2
from the thermostat.
optional electric Heater kits
This packaged air conditioner is designed to allow optional
electric heat to be field installed as required by the building’s
particular heating load. The options available for each unit
are shown in the heater kit installation instructions.
Optional field-installed electric heater kits are available
in 5 kw to 20 kw heating capacities for single phase, and
9 kw to 15 kw heating capacities for three phase. A separate
installation instruction document for the electric heaters and
their application is shipped with the heater kits.
A single stage 24VAC thermostat should be used with
these units. If electric heat is installed, a single-stage or
two- stage heating thermostat will be required depending
on the heater kit. Install the heater kits as directed by the
instructions supplied with the heater kit. Follow all cautions
and warnings as directed.
1. Measure the line voltages
of your 3-phase power
supply where it enters the
building and at a location
that will only be dedicated
to the unit installation. (at
the units circuit protection
or disconnect).
exaMPle:
AB = 451V
BC = 460V
AC = 453V
2. Determine the average voltage in the power supply.
In this example, the measured line voltages were 451, 460,
and 453. The average would be 454 volts (451 + 460 +
453 = 1,364 / 3 = 454).
3. Determine the maximum deviation:
exaMPle
From the values given in step 1, the BC voltage (460V) is
the greatest difference in value from the average:
460 - 454 = 6
454 - 451 = 3
454 - 453 = 1
4. Determine percent of
voltage imbalance by using
the results from steps 2 & 3
in the following equation.
6
454
100 x
= 1.32%
exaMPle
max voltage deviation
from average voltage
= 100 x
average voltage
% Voltage Imbalance
The amount of phase imbalance (1.32%) is satisfactory
since the amount is lower than the maximum allowable 2%.
Please contact your local electric utility company if your
voltage imbalance is more than 2%.
thermostat connections
Several thermostat options are available depending on the
accessories installed with the unit. See
for 460V
units. Select a thermostat that operates in conjunction with
the installed accessories. The low voltage wires must be
properly connected to the units low voltage terminal block.
Recommended wire gauge and wire lengths for typical
thermostat connections are listed in
.
iMPortant note:
the thermostat should be mounted about 5 feet above the
floor on an inside wall. do not install the thermostat on
an outside wall or any other location where its operation
may be adversely affected by radiant heat from fireplaces,
sunlight, or lighting fixtures, and convective heat from
warm air registers or electrical appliances. refer to the
thermostat manufacturer’s instruction sheet for detailed
mounting and installation information.
table 2. copper Wire Size
coPPer Wire Size — aWg
(1% voltage droP)
SuPPly Wire lengtH-Feet
SuPPly
circuit
aMPacity
200
150
100
50
6
8
10
14
15
4
6
8
12
20
4
6
8
10
25
4
4
6
10
30
3
4
6
8
35
3
4
6
8
40
2
3
4
6
45
2
3
4
6
50
2
3
4
6
55
1
2
3
4
60
Wire Size based on N.E.C. for 60° type copper conductors.
table 3. thermostat Wire gauge
tHerMoStat
Wire gauge
MaxiMuM recoMMended
tHerMoStat Wire lengtH (Ft)
24
25
22
45
20
70
18
110