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The
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MNI
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Consult the rating plate on the unit. The following
information describes the model number structure.
1.C Model Identification
Prices Effective Nov 11th, 2019
Document 6120A
Customer Service and Product Support:
800.900.9276 • Fax 800.559.1583
Headquarters:
20
Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355
9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 • 905.203.0600 • Fax 905.636.0666
www.Laars.com
Printed in U.S.A. © Laars Heating Systems 20-02 Document 6120A
O
MNI
T
HERM
®
ASME "H" stamp (OCH)
Multiple, independent heat demands
Outdoor reset with sensor (OCH)
ASME "HLW" stamp (OCV)
Sealed combustion chamber
High & low gas pressure switches
160 psi maximum working pressure
Pre-mix stainless steel burner
Vent temperature cutoff
Certified for Category II & IV vent
Control cascades with up to
Normally open alarm contact
Cat IV horizontal or vertical direct vent
eight OmniTherm OCH / OCV units
Air filter
Cat IV vent & air pipe lengths of up to
VARI-PRIME boiler pump control
Water flow switch
100 equivalent feet (each)
with fixed delta T control for
Temperature & pressure gauge
Indoor / outdoor
variable flow through boiler (OCH)
Low water cutoff
Low NOx system exceeds the
Accepts 4-20ma or 0-10VDC
75 psi (517kPa) ASME rated
most stringent NOx regulations
external modulation or external
pressure relief valve (OCH)
Sophisticated gas/air valve allows
set point control
125 psi (861kPa) ASME rated
for constant control of combustion
Modbus RTU & BACnet MSTP
pressure relief valve (OCV)
Stainless steel heat exchanger
on board
Groove lock fittings
with welded construction
Multiple pump control, each with delay
(optional flange adapter)
Electronic PID modulating control with
Indirect DHW priority (OCH)
Burner site glass
large touchscreen and color display
Domestic water sensor
10-yr limited warranty
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4
5
6
7
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10
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X- std OCH, 75psi PRV, H-Stamp
N- OCV w/ H-Stamp, 30psi PRV
W- std OCV, 125psi PRV, HLW-Stamp
P- OCV w/ H-Stamp, 50psi PRV
X- None
H- Gateway LONworks
A- 30psi PRV
R- OCV w/ H-Stamp, 60psi PRV
A- Gateway, BACnet IP
& alarm bell
B- 50psi PRV
S- OCV w/ H-Stamp, 75psi PRV
B- Gateway, LONworks
J- Gateway LONworks
C- 60psi PRV
T- OCV w/ H-Stamp, 125psi PRV
C- Alarm bell
& high limits
D- OCV 75psi PRV
U- OCV w/ H-Stamp, 150psi PRV
D- Auto & manual
K- Gateway LONworks
E- OCH 125psi PRV
2- Flange kit, OCV H-Stamp, 30psi PRV
high limits
& alarm bell
F- 150psi PRV
3- Flange kit, OCV H-Stamp, 50psi PRV
E- Gateway BACnet IP
& high limits
G- Flange kit & 30psi PRV
4- Flange kit, OCV H-Stamp, 60psi PRV
& alarm bell
L- Alarm & high limits
H- Flange kit & 50psi PRV
5- Flange kit, OCV H-Stamp, 75psi PRV
F- Gateway BACnet IP
J- Flange kit & 60psi PRV
6- Flange kit, OCV H-Stamp, 125psi PRV
& high limits
K- Flange kit & 75psi PRV
7- Flange kit, OCV H-Stamp, 150psi PRV
G- Gateway BACnet IP
L- Flange kit & 125psi PRV
& alarm bell
M- Flange kit & 150psi PRV
& high limits
Usage
Waterway Options
Additional Options
C- 208V, single phase (1500-2500)
OmniTherm - Category II / IV Vent
Commercial Boiler / Water Heater OCH & OCV with Laars Linc Control
Standard Features
J- CSD-1
B- 220/240V, single ph (1500-2500)
Model Nomenclature
Series
Size / MBH
Fuel
Construction
Electrical System
Revision
OC - OmniTherm
N- Nat
X- Standard
A- 120V, single phase (1250-2000)
1- First
Cat II & IV
D- 208V, three phase (2500-3000)
H - Hydronic
E- 480V, three phase (2500-3000)
V - Volume Water
F- 600V, three phase (2500-3000)
SECTION 1 General Information
1.A
Introduction
This manual provides information necessary for the
installation, operation, and maintenance of LAARS
Heating Systems OmniTherm appliances. Read it
carefully before starting the installation.
All application and installation procedures should
be reviewed completely before proceeding with the
installation. Consult the LAARS Heating Systems factory,
or local factory representative, with any problems or
questions regarding this equipment. Experience has
shown that most operating problems are caused by
improper installation.
OmniTherm is protected against over pressurization. A
pressure relief valve is included with each OmniTherm.
Some OmniTherms may require that the PRV be
installed prior to filling the system. Refer to Figures 4-7
for PRV locations.
1.B
Warranty
LAARS Heating Systems OmniTherm appliances are
covered by a limited warranty. The owner should complete
the warranty registration at www.Laars.com.
All warranty claims must be made to an authorized
LAARS Heating Systems representative. Claims must
include the serial number and model (this information
can be found on the rating plate), installation date, and
name of the installer. Shipping costs are not included in
the warranty coverage.
