Reznor UDAS Unit Installation Manual - Manual (Page 6)

Page 6
Hazards of Chlorine -
applies to Separated
Combustion Heaters
location with regard to
the combustion air inlet
When units are located in the center of the space to be heated, the air should be dis-
charged toward the exposed walls. In large areas, units should be located to discharge
air along exposed walls with extra units provided to discharge air in toward the center
of the area.
At those points where infiltration of cold air is excessive, such as at entrance doors and
shipping doors, it is desirable to locate the unit so that it will discharge directly toward
the source of cold air from a distance of 15 to 20 feet (4.6-6.1M).
CAUTION: Do not locate the heater where it may be exposed to
water spray, rain, or dripping water.
For a location where dirt, dust, or other airborne contaminants are present in the indoor
environment, it is recommended to install a separated-combustion unit, Separated
Combustion model, that uses outside air for combustion. Using a separated-combustion
unit will reduce the build-up of contaminants on the burner. Any buildup on the burner
will adversely affect the combustion process.
The presence of chlorine vapors in the combustion air of gas-fired heating equipment
presents a potential corrosion hazard. Chlorine found usually in the form of freon or
degreaser vapors, when exposed to flame will precipitate from the compound, and go
into solution with any condensation that is present in the heat exchanger or associated
parts. The result is hydrochloric acid which readily attacks all metals including 300 grade
stainless steel. Care should be taken to separate these vapors from the combustion
process. This may be done by wise location of the unit vent and combustion air
terminals with regard to exhausters or prevailing wind directions. Chlorine is heavier
than air. Keep these facts in mind when determining installation location of the heater
in relation to building exhaust systems.
2.0 Unit Heater
Location
(cont’d)
2.2 Location
Recommendations
(cont’d)
3.0 Uncrating and
Preparation
3.1 Uncrating and Inspecting
This unit was test operated and inspected at the factory prior to crating and was in
operating condition. If the heater has incurred any damage in shipment, document the
damage with the transporting agency and contact an authorized Distributor. If you are
an authorized Distributor, follow the FOB freight policy procedures.
Check the rating plate for the gas specifications and electrical characteristics of the
heater to be sure that they are compatible with the gas and electric supplies at the
installation site.
High Altitude Kit, Option DJ20 or DJ21
If the heater is being installed at an elevation above 2000 ft (610M), the input rate will
have to be derated. This is done by adjusting the valve outlet pressure.
3.2 Preparing for
Installation
Read this booklet and become familiar with the installation requirements of your par-
ticular heater. If you do not have knowledge of local requirements, check with the local
gas company or any other local agencies who might have requirements concerning
this installation. Before beginning, make preparations for necessary supplies, tools,
and manpower.
IMPORTANT: Shipping brackets are attached with cabinet screws. When remov-
ing shipping brackets, re-insert ALL screws into the cabinet.
3.2.1 Field-Installed
Parts
Models with Separated Combustion - In the literature bag, find three cap screws, P/N
203311, and three sealing washers, P/N 61658. After attaching the hanging hardware
(Paragraph 5.2), these screws and washers must be used to seal the unused holes in
the top of the heater.
Models with Standard Power Vent - If the installation includes optional vertical louvers,
downturn nozzle, ceiling mounting bracket, hanger kit, high altitude kit, multiple heater
control, sensor for DDC control, and/or stepdown transformer, install these options
before the heater is suspended. Complete instructions are in this form or in the
option package; option packages are shipped separately.
Other shipped separate items could include a vent cap (Standard Power Vent heaters
with Option CC1); a vent/combustion air kit (Separated Combustion heaters with
Option CC2 or CC6); a manual gas valve; a thermostat bracket kit; a thermostat; and/
or a thermostat guard. Be sure all options ordered are at the installation site.