Raytherm® - Type H
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Engineer:
Contractor:
Prepared By:
Model:
Low NOx
Hydronic Heating Boilers
Date:
Models 181-401 - Indoor
Indoor
LOW NOx
ꢀ Less than 40 nanograms per joule
EFFICIENT
ꢀ 82% 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
Controls (cont'd)
Temperature Controls
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ASME Inspected and Stamped
160 PSIG
National Board Approved
Headers
Cast Iron Glass-lined – Standard
Bronze – Option A-1
Finned Tubing
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High Limit Control, Manual Reset
On/Off Switch
Flow Switch
Economaster II Pump Time Delay
B-6 2-stage Aquastat –
100-200ºF
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
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Gas Train
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Natural Gas
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Manual Main Gas Shut-off Cock
Main Gas Pressure Regulator
Redundant Safety Shut-off Valve
Control Valve
Copper – Standard
Cupro Nickel – Option A-3
ASME Steel Tube Sheet
Silicone O-Rings
ASME Pressure Relief Valve
45 PSIG – Standard
PSIG ASME – Optional
Temperature and Pressure Gauge,
Shipped Loose
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Additional Safety Controls
Firing Mode
F-10 Low Water Cut-off Probe
On/off (H4)
Two-stage firing (H3)
Design Certified
I-1
High Limit Control, Auto
Reset
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S-1 Low Gas Pressure Switch
S-2 High Gas Pressure Switch
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ANSI Z21.13 H Stamp
Water Connections
Construction
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Left Hand – Standard
Right Hand – Option A-6
Flow Configuration – Two-pass
Pump – Optional
Front Controls
Stainless Steel, Fan-Assisted
Burners
Polytuf Powder Coat Finish
Draft Diverter
Base – Optional
Regulatory Agency Requirements
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Mounted, 1/8 HP, 120 V, 1∅, 60 Hz
Controls
Combustible Floor Shield –
Option J-1
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120V, 60Hz, 1 Ph Power Supply
120/24V Transformer
100% Pilot Shut-off/Lockout
Electronic, Intermittent Ignition (IID) Pilot
Catalog No.: 2000.203E
Effective: 12-1-07
Replaces: 4-1-05
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