User manual

Operation
Liebert
®
iCOM
®
46
3.5.1 Electric, Hot Gas and Hot Water Reheat
Different types of cooling units feature different types of standard electrical heating. Not all types
offer hot gas or hot water reheat. The number of electrical heating stages also varies—some types of
cooling units have single-stage electrical heating as standard and offer two-stage electrical heating as
an option. Other types feature three-stage heating as standard.
The Reheat Proportional Band is divided into three equal parts, each representing one reheat stage.
As the Temperature Proportional Band increases the call for heating from 0% to -100%, stages 1
through 3 are switched On, as shown in Figure 41. Your unit will have one of the nine reheat
configuration types shown in Table 5.
Figure 41 Three-stage heating
Table 5 Reheat configuration types
Type A B C D E F G H I
Stage 1 Electric 1 Electric 1 Electric 1 Hot Gas Hot Gas Hot Gas Hot Water Hot Water Hot Water
Stage 2 - Electric 2 Electric 2 - Electric 1 Electric 1 - Electric 1 Electric 1
Stage 3 - - Electric 3 - - Electric 2 - - Electric 2
NOTE
1. Hot gas / hot water are not influenced by the setting of electric reheat during
dehumidification.
2. Hot gas output will be set only if the selected compressor is in operation.
0%
Heating
65 70
Heat 3
On
½ Dead-
band
66 67 68 69
Heat 2
On
Heat 1
On
Heat 3
Off
Heat 2
Off
Heat 1
Off
-100%
Heating
½ Proportional Band
Decreasing Temperature
Temp Setpoint: 70°F
Proportional Band: 8°F
Deadband: 2°F