LAARS DuraFlow User Manual
Installation and Operation Instructions Document 2110A
Installation
and Operation
Instructions for
DuraFlow
OUT OF
Water Heater
PRODUCTION
2400-382A
A subsidiary of BRADFORD WHITE Corporation
Page 2
LAARS Heating Systems Company
TABLE OF CONTENTS
SECTION 1.
General Information
1A. Introduction................................................... 3
1B. Piping ........................................................... 3
1C. Wiring ...........................................................5
OUT OF
SECTION 2.
Remote Bulb Aquastat Controller
2A. Application .................................................... 5
2B. Installation .................................................... 5
2B-1. Mounting with Boiler Fitting .......................... 5
2B-2. Wiring ........................................................... 5
2C. Adjustments.................................................. 6
2D. Checkout ......................................................6
PRODUCTION
DuraFlow Water Heater
SECTION 1.
General Information
1A. Introduction
The DuraFlow water heater / buffer was
designed and developed specificaly as a companion
for
modern low mass, high efficiency heating boilers.
When piped between the supply and return it
provides a twenty gallon buffer in the hydronic
system. This is typically required in systems with
three or more zones to store and release heating
capacity when only a single zone is operating.
As a water heater, it utilizes the rapid heat-up
ability of low mass boilers to immediately convert this
energy to a steady state continuous domestic output.
In single residential applications when provided
with a properly piped mixing valve and flow restrictor
(see Figure 2) it is
year warranty.
the hot water source with a twenty
Page 3
1B. Piping
When the DuraFlow is utilized as a domestic
water indirect, it may be piped as a zoned indirect
utilizing conventional circulator or zone valve piping
and wired with domestic water priority. In this and
buffer applications, the DuraFlow must always be
piped with a thermally trapped tempering valve and
flow restrictor set for applicable boiler input.
When utilized as both a buffer and a domestic
water indirect, the DuraFlow is piped to the heating
system supply and return headers or as the bypass on
systems requiring primary / secondary piping. No
zone valve or circulator should be piped in series with
the DuraFlow. In most applications the boiler pump
STORAGE
PRODUCTION
TANK
OUT OF
ALTERNATIVE APPLICATIONS
PRESSURE
RELIEF VALVE
DURAFLOW
*Minimum Clearance
Dimension
Figure 1. Dimensions and Connections.
(internal or external) serves as the flow means
between the boiler and tank when used as a buffer.
In multi-unit residential applications with a
single hydronic heating system, it serves as the heat
exchanger source for single or multi tank domestic
water storage.
When piped as a buffer and an indirect domestic
water source to a storage tank, a tempering valve and a
flow restrictor are not required.
RECOMMENDED
ANTI-SCALD VALVE
SUCH AS SPARCO
OR DANFOSS
REQUIRED
FLOW
RESTRICTOR
(SUPPLIED)
AQUASTAT
COLD
OPTION 1
Figure 2. Domestic Hot Water Piping.
OPTIONAL RETURN LINE PIPING
OPTION 2
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