42
110328-02 - 6/22
ALTA
Installation, Operating & Service Instructions
12
Field Wiring
DANGER
Electrical Shock Hazard.
•
Disconnect electrical supply before
installing or performing maintenance.
• Electrical power may be supplied
from more than one circuit.
•Lock out all electrical boxes with padlock once
power is turned off.
!
WARNING
Electrical Shock Hazard.
All wiring and grounding must conform to
requirements of authority having jurisdiction or,
in absence of such requirements, to National
Electrical Code/NFPA 70 or Canadian Electrical
Code, Part 1 (CSA C22.1 - latest edition).
•
Make electrical connections according
to boiler's wiring diagram and instructions.
Failure to properly wire electrical connections
to the boiler may result in severe personal
injury, death or substantial property damage.
•
Protect each boiler circuit with a
properly sized over-current device.
•
Never jump out or bypass any safety or
operating control or component of this boiler.
!
NOTICE:
Internal wiring diagrams contained in
this manual are for reference only. Each boiler is
shipped with a wiring diagram sheet within boiler
literature packet. Read, understand and follow this
wiring diagram and wiring diagrams of any field
supplied controls.
NOTICE:
Boiler is equipped with a UL 353 listed
high water temperature limit. This limit provides
boiler shutdown in event boiler water temperature
exceeds setpoint of control. Certain local codes
require an additional water temperature limit. If
necessary, install an additional water temperature
limit (Honeywell L4006 Aquastat). Wire as
indicated in Figure 12-3.
Locating Field Connection Terminal Strips
Field connection terminal strip locations are shown in
Figure 12-1. To access terminal strips:
1. Remove front door. Front door is removed by
first loosening two thumb screws located
under front of door.
2. Disconnect igniter wire at burner door.
3. Pull control enclosure forward, then to the left and
allow it to swing down into the service position.
Figure 12-1: Location 120 VAC and Low Voltage
Connection Boards
Low Voltage Connection Board
120 VAC Connection Board
Opened Control
Enclosure
Jacket Knockouts
Jacket Knockouts
A
B
A
B
1
2
1
2
REVISIONS
REV.
EN
DATE
DESCRIPTION
DWN
CHK
APVD
A
103-xxx-xxxx
01/06/2022
PRODUCTION RELEASE
EJL
UNLESS OTHERWISE NOTED:
ALL DIMENSIONS IN INCHES.
TOLERANCES:
X.X ±.1 X.XXX ±.005
X.XX ±.03 ANGLE ±1°
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
MATERIAL:
ITEM NUMBER:
FIRST USE:
TITLE:
DRAWING NUMBER:
DATE:
REVISION:
SIZE: A
SHEET: 1 OF 1
SCALE: NONE
APVD:
CHK:
DES: EJL
01/06/2022
ALTA
HEAT ONLY UNITS
VOLTAGE CONNECTION BOARDS
LOCATION OF HIGH & LOW
A
TS-103-78
Field 120 VAC Connections
1. Provide a dedicated circuit for boiler of 15A
or greater. A service switch is recommended
and is required by many local codes.
Locate this switch in accordance with local codes
or, in absence of such requirements, in a location
where it can be safely accessed in an emergency.
2. All 120 VAC connections to boiler are made on
120 VAC Connections terminal strip (see Figure
12-2) located on right side of bottom panel. Route
all 120 VAC wiring through conduit knock out
holes located on right side in front of terminal strip.
120V
Line
Boiler
Pump
Aux
Pump
GND
L
N
L
N
L
N
L
N
System
Pump
L2
Power Supply
120/60/1
Overcurrent Protection/ Disconnect
Service Switch
L1
A
B
A
B
1
2
1
2
REVISIONS
REV.
EN
DATE
DESCRIPTION
DWN
CHK
APVD
A
103-143-14599
12/XX/2021
PRODUCTION RELEASE
EJL
UNLESS OTHERWISE NOTED:
ALL DIMENSIONS IN INCHES.
TOLERANCES:
X.X ±.1 X.XXX ±.005
X.XX ±.03 ANGLE ±1°
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
MATERIAL:
ITEM NUMBER:
FIRST USE:
TITLE:
DRAWING NUMBER:
DATE:
REVISION:
SIZE: A
SHEET: 1 OF 1
SCALE: 1:1
APVD:
CHK:
DES: EJL
12/16/2021
ALTA
HEAT ONLY
120 VAC CONNECTIONS
A
TS-103-75
