Laars Rheos RHCH, Installation And Operation Instructions Manual, Page: 3 / 60

Rheos Boiler and Water Heater
Page 3
SECTION 1.
General Information
USING THIS MANUAL – Because the Rheos
Boilers and Rheos Water Heaters are identical
appliances, with the exception of materials of
manufacture, labels and ultimate use application,
this manual provides information for the proper
installation, operation and maintenance of both
products. Where differences exist between the
application of the appliances and their operation,
the sections pertinent to only one appliance or the
other will be so identified.
WARNING
The Rheos hydronic, boiler or water heater must be
installed in accordance with the procedures detailed
in this manual, or the Laars Heating Systems
warranty will be voided. The installation must
conform to the requirements of the local jurisdiction
having authority, and, in the United States, to the
latest edition of the National Fuel Gas Code, ANSI
Z223.1/NFPA54. In Canada, the installation must
conform to the latest edition of CSA B149.1 Natural
Gas and Propane Gas Installation Code, and/or
local codes. Where required by the authority having
jurisdiction, the installation of Rheos boilers must
conform to the Standard for Controls and Safety
Devices for Automatically Fired Boilers, ANSI/ASME
CSD-1. Any modifications to the boiler, its gas
controls, or wiring may void the warranty. If field
conditions require modifications, consult the factory
representative before initiating such modifications.
1.1 Introduction
This manual provides information necessary for
the installation, operation, and maintenance of Laars
Heating Systems Rheos (copper tube or cupronickel
tubes) appliances. Read it carefully before 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.
The Rheos appliance is protected against over
pressurization. A pressure relief valve is fitted to all
appliances. It is installed inside the jacket, at the water
outlet of the unit.
IMPORTANT: The inlet gas pressure to the appliance
must not exceed 13" W.C. (3.2kPa).
All installations must be made in accordance
with 1) American National Standard Z223.1/NFPA54-
Latest Edition “National Fuel Gas Code” or 2) CSA
B149.1 “Natural Gas and Propane Installation Code”
and with the requirement of the local utility or other
authorities having jurisdiction. Such applicable
requirements take precedence over the general
instructions contained herein.
All electrical wiring is to be done in accordance
with the local codes, or in the absence of local codes,
with: 1) The National Electrical Code ANSI/NFPA No.
70-latest Edition, or 2) CSA STD. C22.1 “Canadian
Electrical Code - Part 1”. This appliance must be
electrically grounded in accordance with these codes.
1.2 Model Identification
Consult the rating plate on the unit. The
following information describes the model number
structure.
(1-2) Model Series Designation
R H = Rheos mid-sized commercial
(3) Model Efficiency
C = Mid Efficiency (non-condensing)
H = High Efficiency (condensing)
(4) Usage
H = Hydronic
V = Volume Water
(5-8) Size
1 2 0 0 = 1,200,000 BTU/hr input
1 6 0 0 = 1,600,000 BTU/hr input
2 0 0 0 = 2,000,000 BTU/hr input
2 4 0 0 = 2,400,000 BTU/hr input
Model Designation
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
R H 0 0 A F
SERIES
R H C
H
USAGE
H
V
SIZE
1
2 0 0
1 6 0 0
2 0 0 0
2 4 0 0
FUEL
N
P
ALTITUDE
A
FIRING
MODE
F
LOCATION
I
C
REVISION
1
2
HEAT
EXCHANGER
E
F
OPTION
CODES
X X
A H
B N
C S
D
E
F
G