Electric, Hot Gas And Hot Water Reheat; Figure 26 Three-Stage Heating; Table 7 Reheat Configuration Types - Emerson Liebert iCOM Manual

3.4.1

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 26. Your unit will have one of the nine reheat
configuration types shown in Table 7.
Table 7 Reheat configuration types
Type
Stage 1 Electric 1
Stage 2
Stage 3
NOTE
Hot water is not influenced by the setting of electric reheat during dehumidification.

Figure 26 Three-stage heating

Additional Reheat Rules
The reheat activation rules in the preceding section may be altered, depending on which reheat mode
is selected on line A144:
• None: No reheats will ever be activated for dehumidification.
• Staged: The reheat rules in the preceding section will apply.
• When a parameter on line DH07 (Reheat Stage to Deactivate C1B / C2B) is set to None, its
corresponding compressor will not be deactivated when reheats turn On.
® ®
Liebert iCOM for Liebert DSE
A B
Electric 1 Electric 1
- Electric 2 Electric 2
- - Electric 3
Temp Setpoint: 70°F
Proportional Band: 8°F
Deadband: 2°F
Heat 3
On Heat 2
On
65 66
-100 %
Heat 3
Heating
Off
½ Proportional Band
Decreasing Temperature
™
C G
Hot Water Hot Water
- Electric 1
-
Heat 1
On ½ Dead-
band
67 68 69
Heat 2 Heat 1
Off Off
32
H I
Hot Water
Electric 1
- Electric 2
70
0%
Heating
Operation