Lennox CHA16 User Manual

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) plugin
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 Tap208V
Orange Tap230V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
50VA
All
460V
Red Tap440V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
48VA
2.5A
2.5A
45kW, 60kW
575V
15kW, 30kW
Red Tap550V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
50VA
2.5A
75kW
575V
Red Tap575V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
70VA
3.5A
90kW
Exc. 75kW
208/230V
Red Tap208V
Orange Tap230V
Black TapCommon
Blue Tap24VAC
Yellow TapCommon
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 threephase 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 doublebreak 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
ECH1682/9510Y
ECH1682/9510G
ECH1682/9510J
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
ECH1682/9515Y
ECH1682/9515G
ECH1682/9515J
ECH1682/9520Y
ECH1682/9520G
ECH1682/9520J
ECH1682/9530Y
ECH1682/9530G
ECH1682/9530J
ECH1682/9540Y
ECH1682/9540G
ECH1682/9540J
Unit
CHA16823
&
CHA16953
ECH16135/16015Y 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
CHA161353
&
CHA161603
ECH16135/16015G
ECH16135/16015J
ECH16135/16020Y
ECH16135/16020G
ECH16135/16020J
ECH16135/16030Y
ECH16135/16030G
ECH16135/16030J
ECH16135/16040Y
ECH16135/16040G
ECH16135/16040J
ECH16135/16050Y
ECH16135/16050G
ECH16135/16050J
ECH1618515Y
ECH1618515G
ECH1618515J
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
ECH16185/30030Y
CHA162553/
CHA162753
&
CHA163003
CHA161853/
CHA162553/
CHA162753
&
CHA163003
ECH16185/30030G
ECH16185/30030J
ECH16185/30045Y
ECH16185/30045G
ECH16185/30045J
ECH16185/30060Y
ECH16185/30060G
ECH16185/30060J
ECH16275/30075Y
ECH16275/30075G
ECH16275/30075J
18 / Wye
18 / Wye
90000 @ 460V
90000 @ 575V
ECH16275/30090G
ECH16275/30090J
CHA161853
CHA161853/
CHA162553/
CHA162753
&
CHA163003
CHA162553/
CHA162753
&
CHA163003
TABLE 15

Lennox CHA16 Specifications

General

Brand	Lennox
Model	CHA16
Category	Air Conditioner
Language	English