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Catalog No.: 2000.204D Effective: 12-1-07 Replaces: 4-1-05
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Model: Outdoor
LOW NOx
Less than 40 nanograms per joule
EFFICIENT
82% thermal efficiency – highest of any atmospheric boiler
available today
THERMAL SHOCK PROOF
Twenty-year warranty against thermal shock damage
up to 150°F differential
Maximum operating temperature: 230°F
LIGHTWEIGHT
A floor load of 70 lbs./sq. ft. or less
HIGH RECOVERY
Cuts fuel costs substantially because the standby and
radiation losses normal to other boilers and
tank-type water heaters are eliminated
LOW WATER OPERATING TEMPERATURE
Operates with water temperature as low as
105°F without condensing
Heat Exchanger
ASME Inspected and Stamped
160 PSIG
National Board Approved
Headers
Cast Iron Glass-lined – Standard
Bronze – Option A-1
Finned Tubing
Copper – Standard
Cupro Nickel – Option A-3
ASME Steel Tube Sheet
Silicone O-Rings
45 PSIG ASME Pressure Relief Valve
Temperature and Pressure Gauge,
Shipped Loose
Water Connections
Left Hand – Standard
Right Hand – Option A-6
Flow Configuration – Two-pass
Pump – Optional
Mounted, 1/8 HP, 120 Volt, 1∅,
60 Hz
Controls
120V, 60Hz, 1 Ph Power Supply
120/24V Transformer
100% Pilot Shut-off/Lockout
Electronic, Intermittent Ignition (IID)
Pilot
High Limit Control, Manual Reset
Controls (cont'd)
On/Off Switch
Flow Switch
Economaster II Pump Time Delay
Gas Train
Natural Gas
Manual Main Gas Shut-off Cock
Main Gas Pressure Regulator
Redundant Safety Shut-off Valve
Control Valve
Firing Mode
On/Off (H4)
Two-stage Firing (H3)
Design Certified ANSI Z21.13
Construction
Stainless Steel, Fan Assisted
Burners
Front Controls
Polytuf Powder Coat Finish
Stackless Top
8" Base – Standard
Vent Selection
Stackless Top – Option D-11
Power Vent, Loose – Option D-2
Temperature Controls
B-6 2-stage Aquastat – 100-200F
B-26 2-stage Digital Controller
B-27 2-stage Digital Controller,
Outdoor Reset
Y-241 Electronic Sequencer,
1-4 stages
Y-281 Electronic Sequencer,
1-8 stages
Additional Safety Controls
F-10 Low Water Cut-off Probe
I-1 High Limit Control, Auto Reset
S-1 Low Gas Pressure Switch,
Manual
S-2 High Gas Pressure Switch,
Manual
Regulatory Agency Requirements
Raytherm
®
- Type H
Hydronic Heating Boilers
Models 181-401 - Outdoor
Low NOx