Lennox CHA16, Руководство по обслуживанию

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Page 36
16-Terminal Strip TB3
Electric heat line voltage connections are made to
terminal strip TB3 located in the lower right corner
of the control box. CHA16 unit electrical connec
tions are also made here.
17-Transformer T2
T2 is a line voltage to 24V transformer located in the
electric heat control box. The transformer provides
24VAC power to all ECH16 controls (contactor coils
and time delays). Pilot relays (K9 and K19) plugin
to the CHA16 provide 24V circuit isolation.
Transformer T2 is rated in table 14.
TABLE 14
Electric Heat
Unit
T2 TRANSFORMER RATINGS
Primary
Secondary
Internal
Fuse
208/230V Red Tap208V
Orange Tap230V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
50VA
All
460V
Red Tap440V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
48VA
2.5A
2.5A
45kW, 60kW
575V
15kW, 30kW
Red Tap550V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
50VA
2.5A
75kW
575V
Red Tap575V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
70VA
3.5A
90kW
Exc. 75kW
208/230V
Red Tap208V
Orange Tap230V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
70 VA
3.5A
75kW
18-Heating Elements
Heating elements are composed of helix wound
bare nichrome exposed directly to the airstream.
Heating elements are energized directly by contac
tors in the ECH16 control box. Once energized,
heat transfer is instantaneous. Overtemperature
protection is provided by primary and secondary
high temperature limits. Overcurrent protection is
provided by fuses.
Each stage of electric heat consists of three ele
ments connected in a threephase arrangement.
Elements in 208/230V units are connected in a
Delta" arrangement. Elements in 460 and 575V
units are connected in Wye" arrangement.
Each stage is energized independently by a three
pole doublebreak contactor and is protected by
safety limits. Heating elements used in ECH16 series
units are listed in table 15.
Heat Section Total Watts
Number of
Elements/
Arrangement
CHA16 HEATING ELEMENTS
ECH1682/9510Y
ECH1682/9510G
ECH1682/9510J
10000 @ 240V
10000 @ 460V
10000 @ 575V 3 / Delta
3 / Wye
3 / Wye
6 / Delta
6 / Wye
6 / Wye
20000 @ 240V
20000 @ 460V
20000 @ 575V
15000 @ 240V
15000 @ 460V
15000 @ 575V 3 / Delta
3 / Wye
3 / Wye
6 / Delta
6 / Wye
6 / Wye
30000 @ 240V
30000 @ 460V
30000 @ 575V
9 / Delta
9 / Wye
9 / Wye
40000 @ 240V
40000 @ 460V
40000 @ 575V
ECH1682/9515Y
ECH1682/9515G
ECH1682/9515J
ECH1682/9520Y
ECH1682/9520G
ECH1682/9520J
ECH1682/9530Y
ECH1682/9530G
ECH1682/9530J
ECH1682/9540Y
ECH1682/9540G
ECH1682/9540J
Unit
CHA16823
&
CHA16953
ECH16135/16015Y 15000 @ 240V
15000 @ 460V
15000 @ 575V
3 / Delta
3 / Wye
3 / Wye
6 / Delta
6 / Wye
6 / Wye
30000 @ 240V
30000 @ 460V
30000 @ 575V
20000 @ 240V
20000 @ 460V
20000 @ 575V 3 / Delta
3 / Wye
3 / Wye
6 / Delta
6 / Wye
6 / Wye
40000 @ 240V
40000 @ 460V
40000 @ 575V
12 / Delta
12 / Wye
12 / Wye
50000 @ 240V
50000 @ 460V
50000 @ 575V
CHA161353
&
CHA161603
ECH16135/16015G
ECH16135/16015J
ECH16135/16020Y
ECH16135/16020G
ECH16135/16020J
ECH16135/16030Y
ECH16135/16030G
ECH16135/16030J
ECH16135/16040Y
ECH16135/16040G
ECH16135/16040J
ECH16135/16050Y
ECH16135/16050G
ECH16135/16050J
ECH1618515Y
ECH1618515G
ECH1618515J
15000 @ 240V
15000 @ 460V
15000 @ 575V 3 / Delta
3 / Wye
3 / Wye
9 / Delta
9 / Wye
9 / Wye
45000 @ 240V
45000 @ 460V
45000 @ 575V
30000 @ 240V
30000 @ 460V
30000 @ 575V 6 / Delta
6 / Wye
6 / Wye
12 / Delta
12 / Wye
12 / Wye
60000 @ 240V
60000 @ 460V
60000 @ 575V
15 / Delta
15 / Wye
15 / Wye
75000 @ 240V
75000 @ 460V
75000 @ 575V
ECH16185/30030Y
CHA162553/
CHA162753
&
CHA163003
CHA161853/
CHA162553/
CHA162753
&
CHA163003
ECH16185/30030G
ECH16185/30030J
ECH16185/30045Y
ECH16185/30045G
ECH16185/30045J
ECH16185/30060Y
ECH16185/30060G
ECH16185/30060J
ECH16275/30075Y
ECH16275/30075G
ECH16275/30075J
18 / Wye
18 / Wye
90000 @ 460V
90000 @ 575V
ECH16275/30090G
ECH16275/30090J
CHA161853
CHA161853/
CHA162553/
CHA162753
&
CHA163003
CHA162553/
CHA162753
&
CHA163003
TABLE 15