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6
EH-M3-40 Boiler Operation and Installation Instructions
Table 1. Lug Sizes
Model
Phase
EH-8 thru 20
1
EH-12 thru 20
3
Neutral Lug Wire Size:For 3-wire single phase and 4-wire 3 phase
models equipped with circuit breakers. The neutral tap is for the
circulator and control transformer.
† ALUMINUM conductors may be used, lug size, conduit size, ampacity and all
applicable codes permitting.
Table 2. Flow Switch Size Selection
Model No.
EH-8-M3 thru EH-20-M3
* Straight pipe upstream and downstream of flow switch.
Table 3. Current Ratings
SINGLE PHASE 3 WIRE, 120/208V ‡
Basic Model
Heater Amperes
No.
@ 208V
EH8-13-5-M3
29
EH10-13-5-M3
36
EH12-13-5-M3
43.4
EH16-13-5-M3
58
EH20-13-5-M3
72
THREE PHASE 4 WIRE, 120/208V
WYE CIRCUIT ONLY ‡
Basic Model
Heater Amperes †
No.
@ 208V
–
–
–
–
EH12-34-5-M3
43
58 †
EH16-34-5-M3
EH20-34-5-M3
72 †
† Leg with the highest value of line current of an unbalanced 3-phase load.
‡ 125 VAC maximum rating of all hot conductors.
Grounding Lug
Distribution Block
Wire Size
Wire Size
CU-AL†
CU-AL†
6-2/0
6-2/0
6-2/0
6-2/0
Flow Switch
McDonnell & Miller No.
FS4-3T3-1
SINGLE PHASE 3 WIRE, 120/240V ‡
Basic Model
Heater Amperes
No.
EH8-13-5-M3
EH10-13-5-M3
EH12-13-5-M3
EH16-13-5-M3
EH20-13-5-M3
THREE PHASE 4 WIRE, 120/240V
DELTA CIRCUIT ONLY ‡
Basic Model
Heater Amperes †
No.
–
–
EH12-34-5-M3
EH16-34-5-M3
EH20-34-5-M3
Neutral Lug
Wire Size
CU-AL†
6-2/0
6-2/0
Pipe
Minimum
Size
Pipe Length*
1"
6-1/2"
@ 240V
33
42
50
67
83
@ 240V
–
–
50
67 †
83 †
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