41
Installation & Service Manual
6
Operation and startup
(continued)
G.
If the appliance does not function properly after
manually setting the air shutter, use a magnahelic
or slope gauge to set the air shutter based on
differential air pressure.
H.
Install a tee in each of the hoses connecting the
chamber
pressure and burner venturi pressure to the
pressure switch. Install a connecting hose from the
branch of each tee to a
manometer
, magnahelic or
slope gauge, legible in 0.1" increments up to 3" w.c.
I.
Connect chamber pressure to the positive pressure
side of the gauge and burner venturi pressure to the
negative side of the gauge.
J.
Turn the power switch to “ON” position. Combustion
air fan should start. Leave the gas valve “OFF”.
K. With the combustion air fan running, the gauge will
read
a
system differential pressure. The proper
differential pressure should be in the following
range, depending upon length of pipe used:
TABLE 6C
DIFFERENTIAL AIR PRESSURE
Btu/hr Input
Diff erential Pressure
150,000
1.4 - 1.8" w.c.
199,999
1.4 - 1.8" w.c.
250,000
1.5 - 1.9" w.c.
300,000
1.5 - 1.9" w.c.
L.
If adjustment is necessary, follow these steps. If no
adjustment is necessary, go to step “L”.
Burner removal
WARNING
The combustion chamber lining in
this appliance contains ceramic fiber
materials. Ceramic fibers can transform
into cristobalite (crystalline silica) when
exposed to temperatures above 2192°F
(1200°C) dependent upon the length of
exposure time.*
The International Agency for Research
on Cancer (I.A.R.C.) has concluded,
“Crystalline silica inhaled in the form of
quartz or cristobalite from occupational
sources is carcinogenic to humans.”**
Testing has confirmed that the ceramic
fibers in this application do not reach
2192°F (1200°C).
NOTICE
The ceramic fiber material used in this
appliance is an irritant; when handling
or replacing the ceramic materials it is
advisable that the installer follow these
safety guides
.
F.
If adjustment is necessary, follow these steps. If no
adjustment is necessary, go to step “I”.
1. Loosen two combustion air blower mounting
nuts and slide the air shutter to the specified
“A” dimension. See chart.
2. Tighten the combustion air fan mounting
nuts.
3. Proceed to step “N” to check appliance for
proper operation.
1. Loosen two combustion air blower mounting
nuts, to allow the air shutter to slide.
See FIG. 6-4.
2. If differential pressure needs increasing, pull
the air shutter out with thumb and finger
gradually and evenly. Push in the air shutter to
decrease differential pressure.
*Reference Dyson, D., Butler, M., Hughes, R., Fisher, R., and
Hicks, G. The Devitrification of Alumino-silicate Ceramic
Fiber Materials - The Kinetics of the Formation of Different
Crystalline Phases, Ann. Occup. Hyg. Vol. 41, No. 55, 1997.
**Reference I.A.R.C. Monograph 68, June 1997.
M.
Turn the power switch to “OFF” position.
N.
Remove gauge and tee connections, ensuring
connections are made at the pressure switch
correctly; the chamber pressure to the connection
and the burner venturi pressure to the connection.
O.
Turn the gas valve knob to “ON” position.
P.
Turn the power switch to “ON” position.
Q.
Replace upper front access door.
R.
When the main burner lights, observe the burner
flame through observation port. Flames should be
light blue in color with slight yellow tips; flames
should be settled on burner head with no lifting.
S.
The appliance is now ready to operate.
3. If the differential pressure cannot be obtained,
shut the appliance down and inspect the vent
system (both air and flue gas passageways) for
obstructions or leaks.
4. Tighten combustion air blower mounting
nuts.
Summary of Contents for Efficiency-Pac EW 150 -- 300
Page 47: ...47 Notes ...
