Overview of Primary Product

©2012U.S.BoilerCompany,Inc.-Lancaster,PA
Phone:1-888-432-8887
PrintedintheU.S.A.
FormNo.USBL11091-15ms
www.usboiler.net
ESC Dimensions & Connections
Model
Dimensions (inches) Connections (inches)
Water
Content
(gal.)Width Height Depth Supply Return
Gas
Valve
Relief
Valve
ESC-3 12-3/4 41 33 1-1/4 1-1/4 1/2 3/4 2
ESC-4 15-1/2 41 33 1-1/4 1-1/4 1/2 3/4 3
ESC-5 18-1/2 41 33 1-1/4 1-1/4 1/2 3/4 4
ESC-6 21-1/2 41 33 1-1/4 1-1/4 1/2 3/4 5
ESC-7 24-3/4 41 33 1-1/4 1-1/4 3/4 3/4 6
ESC-8 24-3/4 41 33 1-1/4 1-1/4 3/4 3/4 7
ESC-9 30-3/4 41 33 1-1/4 1-1/4 3/4 3/4 8
*Addsuffix“N”fornaturalgas,orsuffix“L”forLPgasmodels
ESC: Technical Information
ESC Ratings & Specications
Model AFUE%
Input
(MBH)
DOE
Heating
Capacity
(MBH)
Net AHRI
(MBH)
Vent Size
(Inches)
Approx.
Shipping
Weight.
(lbs.)
ESC-3 85.5 70 60 52 3 250
ESC-4 85.4 105 90 78 3 300
ESC-5 85.3 140 120 104 3 350
ESC-6 85.2 175 150 130 3 410
ESC-7 85.0 210 179 156 3 460
ESC-8 84.5 245 208 181 4 510
ESC-9 84.0 280 238 207 4 560
Standard Equipment
• Insulatedsleek,modernjacket
• Heavygauge1”baseinsulation
• IntelligentHydronicControl–Simpleself-diagnostic 
 controlsystemwith3-digitreadoutforstatussettings
 anderrors
• IQOptionPanel,acceptsplug&playIQOptionCardsfor
 –OutdoorresetwithDHWpriority
 –Autoormanualresetlowwatercutoff
 –Autoormanualauxilliaryhighlimit
• Step-openingredundantgasvalve
• Stainlesssteelburnertubes
• Stainlesssteelfluegasbaffles
• 110°Fminimumreturntemperaturerating
• Sparkignitionwithcontinuousretry
• User-friendlywiringwith120VJ-box
• Taco007circulatorwithpipingwithwiringharness
• Castironsectionassembly
• Differentialventpressureswitch
• Boilerdrainvalve
• Castironsupplymanifoldwithsafetyreliefvalvetapping
A
S
M
E
H
FLOOR
LINE
**
41”
4”
“W” 1”
VENT
INTAKE
34”
ELECTRICAL
27”
SUPPLY
18”
GAS
15”
RETURN
FLOOR
LINE
0”
0”
4”
15”
19”
22”
4”
33”
1”
VENTILATION AIR
INLET OPENINGS***
12”
MAX
12”
MAX
VENT INTAKE
NOTES:
* Vent pipe minimum clearance to combustible material is (4) inches when vent is installed in a fully enclosed chased application, or (3) inches when vent is installed with at least one side
open, similar to a joist bay application
** Add height required to maintain 6” clearance from all breeching components
*** Area of each opening 1 sq. inch for each 1,000 BTUH input - with minimum of 100 sq. Inches. Height of opening should be half the width.