Boiler Supply
Connection
(G 3/4")
Boiler Return
Connection
(G 3/4")
System
Return
(1-1/4" sweat)
System
Supply
(1-1/4" sweat)
Low Loss
Header
Gaskets
T/P
Gauge
(1/4" NPT)
1" Copper
Combi Block Drain
(hydronic side)
REVISIONS
REV.
EN
DATE
DESCRIPTION
DWN
CHK
APVD
A
103-68-13868
7/21/2020
PRODUCTION RELEASE
EJL
AP
LRM
B
103-XXX-XXXX
8/23/2021
[A2] ADD CALL-OUT FOR 1" COPPER;
[A1] ADD CALL-OUT FOR COMBI
BLOCK DRAIN
EJL
TITLE:
FIRST USE:
ITEM NUMBER:
MATERIAL:
ALTA
HEATING SYSTEM PIPING
LOW LOSS HEADER
DES: EJL
CHK: AP
APVD: LRM
SCALE: 1:4
SIZE: A
SHEET: 1 OF 1
DATE:
REVISION:
DRAWING NUMBER:
07/20/2020
TS-103-49
B
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
Illustrations are for representation only. Improperly located vent can damage property;
Before cementing external vent terminations, complete all preparation
and run start up tests per I,O&S Instructions.
Improper installation, adjustment, alteration, service or maintenance can cause severe personal injury,
death, or substantial property damage. For assistance or additional information, consult a qualified
installer, service agency, or the gas supplier. This boiler requires a special venting system. Read
Installation, Operating and Service Instructions carefully before installing.
WARNING
NEAR BOILER HEAT PIPING
Install
NO OTHER
VALVES
between safety relief
valve and boiler
NEAR BOILER DOMESTIC HOT WATER PIPING
Consult Operating and Service instructions
(I,O&S) for approximate vent de-rates
DHW OUTLET
w/connector
DHW INLET
w/connector
Installation Tips
Vent/Air
Size-Inches
(mm)
Minimum
Equivalent
Length-Feet
(m)
Maximum
Equivalent
Length-Feet
(m)
2 (60)
2.5 (0.76)
70 (21.3)
3 (80)
2.5 (0.76)
135 (41.1)
SELECT
Horizontal 2-pipe
low profile
Horizontal 2-pipe
concentric
Horizontal 2-pipe
(up to 7’ separation)
Hybrid
roof and wall
vent length & diameter
UNPACK
universal connector, lubricate heat
exchanger gasket, install connector
SELECT
vent termination
For more vent termination options and complete
venting information, see I,O&S Instructions.
Do not mount components on
either of the side access panels
(shown removed)
Fast preventative maintenance:
Only four nuts, one gas fitting, one wire to deep heat
exchanger access
WALL MOUNT QUICK DRILLING GUIDE:
Allow these clearances from 5/16” wall mount
bracket holes or consult boiler I,O&S Instructions if
tighter spacing is needed.
26” Min.
26” Min.
26” Min.
56” Min.
LP gas conversion:
1. Turn switch 90° with 2.5mm hex wrench
2. Set fuel gas selection at boiler display
Switch
Direction
Switch
Direction
• Install standard 3/4” PVC to condensate trap drain
• Attach Alta FastPipe (primary/secondary header-included w/boiler)
• Insert dirt and magnetic filters before return
• Attach G 1/2” (BSSP) DHW connectors (2-included) to 3/4” elbows
pointed to rear for best clearance
• Install DHW pressure relief valve in outlet piping
• Install ASSE 1017 or ASSE 1070 listed mixing valve per installation
instructions and local codes
NOTE
All piping is field-supplied
except where noted below
110492-02
Position 1
Position 2
Model ALTAC-136, ALTAC-200
High Efficiency Combi Boiler
For service access:
first disconnect the spark wire at
the heat exchanger. Gently push the
plastic control enclosure down, then
to the left and allow it swing down into
the service position (as pictured).
