Specifications

Manual 2100-423
Page 11
MIS-409
FIGURE 8 – COMPRESSOR CUTOFF THERMOSTAT WIRING
4 & 8 KW 1 Phase – 6 KW 3 Phase
WIRING – LOW VOLTAGE WIRING
230/208V, 1 phase and 3 phase equipment dual primary
voltage transformers. All equipment leaves the factory
wired on 240V tap. For 208V operation, reconnect
from 240V to 208V tap. The acceptable operating
voltage range for the 240 and 208V taps are:
TAP RANGE
240 253 - 216
208 220 - 187
NOTE: The voltage should be measured at the field
power connection point in the unit and while the
unit is operating at full load (maximum
amperage operating condition).
Nine (9) wires should be run from thermostat subbase
to the 24V terminal board in the unit. A nine
conductor, 18 gauge copper, color-coded thermostat
cable is recommended.. The connection points are
shown in Figure 7.
TABLE 3
THERMOSTAT WIRE SIZE
remrofsnarT
AVALFeguaGeriW
mumixaM
ecnatsiD
teeFnI
553.2
eguag02
eguag81
eguag61
eguag41
eguag21
54
06
001
061
052
OPTIONAL OUTDOOR THERMOSTAT
APPLICATIONS
Since most equipment at the time of manufacture is not
designated for any specific destination of the country
and are installed in areas not approaching the lower
outdoor temperature range, outdoor thermostats are not
factory installed as standard equipment, but are offered
as an option. There are also different applications for
applying outdoor thermostats. The set point of either
type of outdoor thermostat application is variable with
geographic region and sizing of the heating equipment
to the individual structure. Utilization of the heating
Application Data, and the heat loss calculation of the
building are useful in determining the correct set points.
OPTIONAL COMPRESSOR CUTOFF
THERMOSTAT (See Figure 8)
Heat pump compressor operation at outdoor
temperatures below 0°F are neither desirable nor
advantageous in term of efficiency. An outdoor
thermostat can be applied to take the mechanical
heating (compressor) off line, and send the
(compressor) signal to energize electric heat in its place
(to make electric heat first stage heating). This can also
be applied to bank the quantity of available electric
heat. For example: A heat pump operates with 10KW
second stage heat – once the outdoor thermostat has
switched then operates 15KW without the compressor
as first stage heat.