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TABLE 2
LHT ELECTRIC HEAT SECTION FUSE RATING
EHO QUANTITY
& SIZE
VOLTAGES
FUSE (3 each)
F3 - 1 F3 - 2 F4 - 1 F4 - 2
EHO075-1, 7.5
208/230V 25 Amp 250V ----- -----
460V 15 Amp 600V ----- -----
575V 10 Amp 600V ----- -----
EHO150-1, 15
208/230V 50 Amp 250V ----- -----
460V 25 Amp 600V ----- -----
575V 20 Amp 600V ----- -----
EHO225-1, 22.5
208/230V 50 Amp 250V ----- 25 Amp 250V -----
460V 25 Amp 600V ----- 15 Amp 600V -----
575V 20 Amp 600V ----- 10 Amp 600V -----
EHO300-1, 30
208/230V 50 Amp 250V ----- 50 Amp 250V -----
460V 25 Amp 600V ----- 25 Amp 600V -----
575V 20 Amp 600V ----- 20 Amp 600V -----
EHO450-1, 45
208/230V 50 Amp 250V ----- 60 Amp 250V 60 Amp 250V
460V 25 Amp 600V ----- 50 Amp 600V -----
575V 20 Amp 600V ----- 40 Amp 600V -----
EHO600-1, 60
208/230V 60 Amp 250V 60 Amp 250V 60 Amp 250V 60 Amp 250V
460V 50 Amp 600V ----- 50 Amp 600V -----
575V 40 Amp 600V ----- 40 Amp 600V -----
EHO057-1, 5.7 384V ----- 15 Amp 600V ----- -----
EHO115-1, 15 384V ----- 25 Amp 600V ----- -----
EHO172-1, 17.2 384V 25 Amp 600V ----- 15 Amp 600V -----
EHO230-1, 23.0 384V 25 Amp 600V ----- 25 Amp 600V -----
EHO345-1, 34.5 384V 25 Amp 600V ----- 40 Amp 600V -----
EHO459-1, 45.9 384V 40 Amp 600V ----- 40 Amp 600V -----
ELECTRIC HEAT CONTROL ASSEMBLY
1-Electric Heat Relay K9
All LHT series units with electric heat use an electric heat
relay K9. K9 is a N.O. DPDT pilot relay intended to electri
cally isolate the unit's 24V circuit from the electric heat 24V
circuit. K9 is energized by CMC1. K9-1 closes, energizing
timer DL2. K9 is located in the electric heat control assem
bly. See figure 9.
2-Time Delay DL2
DL2 is a factory-installed solid state timer used in 22.5 to 60
kW electric heat units. DL2 allows staging by providing a
timed-interval between the first and second heating ele
ments. When the timer is energized, the contacts are
delayed for 30 seconds before closing. When the timer is
de-energized, the contacts are delayed 1 second before
opening. DL2 is located in the electric heat control assem
bly. See figure 9.
FIGURE 9
ELECTRIC HEAT CONTROL ASSEMBLY
ELECTRIC HEAT
SECTION
DL2
ELECTRIC HEAT
CONTROL ASSEMBLY
K9
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