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Boiler
Model No.
SINGLE
PHASE
* KW at
240 VAC
SINGLE
PHASE
D.O.E
Capacity
*(Btu/hr) at
240 VAC
Neutral Lug
Size (AWG)
Solid
Cu ¶ AL
Stranded
Cu ¶ AL
SINGLE PHASE –– THREE WIRE
Main Lug
Size (AWG)
CU ¶ AL
Grounding
Lug Size
(AWG)
Cu
¶ AL
† ** Heater
Amps at
240 VAC
THREE PHASE –– FOUR WIRE 208 VAC WYE §
KW at
208 VAC
D.O.E
Capacity
(Btuh) at
208 VAC
Main Lug
Size (AWG)
CU ¶ AL
Grounding
Lug Size
(AWG)
Cu
¶ AL
† Heater
Amps at
208 VAC
EH8S 8 27000 14-12 12 6-2/0 14-4 6-4 33 ––– ––– ––– ––– ––– –––
EH10S 10 34000 14-12 12 6-2/0 14-4 6-4 42 ––– ––– ––– ––– ––– –––
EH12S 12 41000 14-12 12 6-2/0 14-4 6-4 50 9.012 31000 6-2/0 14-4 6-4 25.1
EH16S 16 55000 14-12 12 6-2/0 14-4 6-4 67 12.016 41000 6-2/0 14-4 6-4 ‡38.1
EH20S 20 68000 14-12 12 6-2/0 14-4 6-4 83 15.020 51000 6-2/0 14-4 6-4 ‡48
EH24S 24 82000 14-12 12 6/2/0 14-4 6-4 100 18.024 62000 6-2/0 14-4 6-4 ‡60
EH28S 28 96000 14-12 12 2-250 MCM 14-4 6-4 117 21.028 72000 6-2/0 14-4 6-4 ‡60
EH32S 32 109000 14-12 12 2-250 MCM 14-4 6-4 133 24.032 82000 6-2/0 14-4 6-4 ‡73
EH40S 40 137000 14-12 12 2-250 MCM 6-2/0 ––– 167 30.040 103000 6-2/0 14-4 6-4 ‡95.4
* Multiply by 0.751 for values at 208 volts AC.
** Multiply by 0.867 for values at 208 volts AC.
† For total current add, to the value shown in the table, the current draw for
circulator and/or zone valve transformer (12 Amp. max.),
‡ Leg with the highest value of line current of an unbalanced 3 phase load.
¶ Aluminum conductors may be used, lug size, conduit size, ampacity and all
applicable codes permitting. However, aluminum conductors may not be
used for model EH-40 single phase.
§ 3 phase 240V special model also available.
Consult factory for information.
“135S” for single phase, 120V/240V, 120V/208V WYE. 3 wire (see
note (1) below) with control circuit breaker.
“345S” for three phase, 120V/208V WYE. 4 wire (see note (1)
below) with control circuit breaker.
Note No. 1: Voltage of any line to ground cannot exceed
125 VAC.
Example: EH-20-135S=20KW boiler for 120V/240V.
120V/208V Single Phase 3 wire.
Specify Model as follows: Model Number. Single or three Phase.
ELECTRICAL
FOR USE WITH TWO-WAY ZONE VALVES
NOTES:
1. Optional blocking gate valve and hose end valve
used (with drain valve) for fast fill and purge of
system.
IMPORTANT Close bypass line valve
(if used) during purging.
2. Circulator should not be installed at lowest point
of piping.
3. There should be no elbows, tees, or change of
pipe size for at least 5 diameters of pipe size
(see table below) upstream and downstream of
flow switch.
Boiler Model
Flow Switch
McDonnell
& Miller No.
Pipe
Size
Minimum Length of
Straight Pipe Upstream
and Down-Stream
of Flow Switch
EH-40 FS8W 1
1
⁄4 IN. 8
1
⁄2 IN.
EH-8 Thru EH-32 FS4-3T3-1 1 IN. 6
1
⁄2 IN.
© Slant/Fin Corp. 2003. Printed in U.S.A. 1203. Publication EH-10
RATINGS AND SPECIFICATIONS
TYPICAL PIPING DIAGRAM
• Single branch circuit for 3 wire 120/208 V WYE, 120/240 Volt a.c.
single phase, 60 Hz or for 4 wire 120/208V WYE three
phase, 60Hz a.c. See note (1) above.
• Circulator relay 12 AMP Max, 120V a.c.
• Heating elements: Low-density replaceable. Copper sheathed
and silver brazed base.
• Relays: Heavy-duty contactors, 48 AMP U.L. rating
SLANT/FIN CORPORATION., Greenvale, N.Y. 11548 • www.slantfin.com
Phone: (516) 484-2600 • Fax: (516) 484-5921
In Canada: Slant/Fin LTD/LTEE, Mississauga, Ontario • www.slantfin.ca