4
110328-02 - 6/22
ALTA
Installation, Operating & Service Instructions
2
User/Homeowner Read Before Proceeding
CAUTION
Burn Hazard.
Keep children and pets away from hot surfaces
of the boiler including boiler piping, vent piping,
and vent terminals.
!
NOTICE:
Protect your home in freezing weather.
A power outage, safety lockout, or component
failure will prevent your boiler from lighting. In
winter your pipes may freeze and cause extensive
property damage. Do not leave heating system
unattended during cold weather unless alarms
or other safeguards are in place to prevent such
property damage.
NOTICE:
Boiler may leak water at the end of its
useful life. Be sure to protect walls, carpets, and
valuables from water that could leak from boiler.
WARNING
Asphyxiation Hazard. Fire Hazard.
• A qualified installer, service agency or
gas supplier should annually inspect boiler
including annually inspecting all vent gaskets
and replacing any exhibiting damage or
deterioration.
• If you are not qualified to install or service
boilers, do not install or service this one.
• Carbon monoxide is an odorless, deadly gas
that may be introduced into your home by any
malfunctioning fuel burning product or vent
system failure.
It is strongly recommended
that CO alarms be installed near bedrooms
and on all levels of building to warn you and
your family of potential CO exposure.
• Do not block air flow into or around boiler.
Insufficient air may cause the boiler to produce
carbon monoxide or start a fire.
!
3
Specifications
Model
Number
Input
1
(MBH)
DOE Heating
Capacity (MBH)
AHRI Net Rating
2
(MBH)
AFUE
Min
Max
ALTA-120
13.6
120
112
97
95
ALTA-150
20
150
141
123
95
ALTA-180
20
180
169
147
95
1
Input for installations with min vent length. See Table 3-3 for derate at max vent length.
2
Net AHRI Water Ratings shown are based on a piping and pickup allowance of 1.15. The manufacturer should
be consulted before selecting a boiler for installations having unusual piping and pickup requirements, such as
intermittent operation, extensive piping systems, etc.
Model
Number
Depth
in. (mm)
Width
in. (mm)
Height
in. (mm)
Space
Heating
Water NPT,
in.
Gas
NPT
Maximum
Allowable
Working
Pressure
psig (kPa)
ALTA-120
16.3 (413) 17.8 (453) 29.8 (757)
1
1/2
50 (345)
ALTA-150
20.4 (518) 17.8 (453) 29.8 (757)
1
1/2
50 (345)
ALTA-180
20.4 (518) 17.8 (453) 29.8 (757)
1
1/2
50 (345)
Table 3-2: Dimensions and Connections
Table 3-1: Ratings
Air Intake
Vent
Front View
Low Voltage
Knockouts
Boiler
Supply
Boiler
Return
120 VAC
Knockouts
Gas
Condensate Trap
Cleanout
Condensate Drain
Bottom View
REVISIONS
REV.
EN
DATE
DESCRIPTION
DWN
CHK
APVD
A
103-143-14599
9/3/2021
PRODUCTION RELEASE
EJL
TITLE:
FIRST USE:
ITEM NUMBER:
MATERIAL:
ALTA
GENERAL CONFIGURATION
HEAT ONLY UNITS
DES: EJL
CHK: ---
APVD: ---
SCALE: 1:10
SIZE: A
SHEET: 1 OF 1
DATE:
REVISION:
DRAWING NUMBER:
09/03/2021
TS-103-62
A
UNLESS OTHERWISE NOTED:
ALL DIMENSIONS IN INCHES.
TOLERANCES:
X.X ±.1 X.XXX ±.005
X.XX ±.03 ANGLE ±1°
PROPERTY OF
U.S. Boiler Company, Inc.
LANCASTER, PA
THIS DOCUMENT CONTAINS CONFIDENTIAL INFORMATION
AND ITS CONTENTS ARE THE SOLE PROPERTY OF U.S. BOILER
COMPANY, INC. ANY REPRODUCTION IN PART OR AS A
WHOLE WITHOUT THE WRITTEN PERMISSION OF U.S. BOILER
COMPANY, INC. IS STRICTLY PROHIBITED.
THIRD ANGLE
PROJECTION
A
A
B
B
2
2
1
1
