Form I-XE/CRGB/RPB, Mfg No. 131782 Rev 4, Page 31
Check installation after start-up
With the unit in operation, measure manifold gas pressure.
High fire manifold pressure for natural gas should be 3.5" w.c.
and 10" w.c. for propane gas. See Paragraph 11.
Turn the unit off and on, pausing two minutes between each
cycle. Observe for smooth ignition. On two-stage or modulat-
ing burner systems, manipulate temperature adjustment slowly
up and down to see if control is sequencing or modulating
properly. Raising temperature setting drives burner on or to
full fire.
Observe burner flame at full fire. Natural gas flame should be
about 1-1/2" in height with blue coloring. Propane gas flame
should be approximately the same length with blue coloring.
Yellow tipping may appear on propane gas. If yellow extends
beyond 1/2 to 3/4", adjust air shutters. See Paragraph 29.
Close all panels tightly. With the heater on, check limit control
by completely blocking off distribution air. The limit control
should open within a few minutes, shutting off the gas supply
to the main burners.
If the system is equipped with an optional dirty filter switch,
set the switch. Follow the instructions in Paragraph 35C.
Place "Owner's Envelope" containing Limited Warranty Card,
this booklet, and any optional information in an accessible
location near the heater. Follow the instructions on the enve-
lope.
DANGER: The gas burner in this gas-fired
equipment is designed and equipped to provide safe,
complete combustion. However, if the installation does
not permit the burner to receive the proper supply of
combustion air, complete combustion may not occur.
The result is incomplete combustion which produces
carbon monoxide, a poisonous gas that can cause
death. Safe operation of indirect-fired gas burning
equipment requires a properly operating vent system
which vents all flue products to the outside
atmosphere. FAILURE TO PROVIDE PROPER
VENTING WILL RESULT IN A HEALTH
HAZARD WHICH COULD CAUSE SERIOUS
PERSONAL INJURY OR DEATH.
Always comply with the combustion air requirements
in the installation codes and instructions. Combustion
air at the burner should be regulated only by
manufacturer-provided equipment. NEVER
RESTRICT OR OTHERWISE ALTER THE
SUPPLY OF COMBUSTION AIR TO ANY
HEATER. Indoor units installed in a confined space
must be supplied with air for combustion as required
by Code and in Paragraph 6A of this heater
installation manual. MAINTAIN THE VENT
SYSTEM IN STRUCTURALLY SOUND AND
PROPERLY OPERATING CONDITION.
lockout control, if the pilot is not established within 120 seconds
(approximately), the unit locks out and must be reset by
interrupting the power to the control circuit (See Lighting
Instructions).
OPTIONAL ACCESSORIES
31. 100% Outside Air Hood (outdoor models)
Outside air hood (Option AS2) is a weatherized, screened hood designed to
be field assembled and installed around the horizontal inlet air opening of the
blower cabinet. The air hood includes factory-assembled louvers (U.S. Patent
4,999,037) designed to help eliminate moisture from the inlet air. Complete
installation instructions are packaged with the air hood option.
FIGURE 29 -
Dimensions
of Optional
Outside Air
Hood
Optional
100%
Outside
Air Hood
43-17/32 (1106mm)
4-5/8
(117mm)
31-11/32
(796mm)
14 (356mm)
minimum
NOTE: The width of
the outside air hood is
the same as the width
of the blower cabinet.
CAUTION: It is recommended that the inlet
to the outside air hood NOT be facing into the
prevailing wind. Allow 14" (356mm) minimum
clearance from the bottom of the air hood to
the mounting surface.
Installation Instructions - 100% Outside Air
Hood
Refer to
FIGURE 30
. All screw ends except those across the bot-
tom should be inside the air hood.
To avoid possible damage, it is recommended that the outside air
hood be installed after the system has been placed on the roof. The
air hood should be installed before the heater is operated. Do not
install the hood while the system (furnace or blower) is in opera-
tion.
1. Top Panel
- On the air inlet side of the blower cabinet, remove
the factory-installed screws attaching the blower cabinet top.
Slide the air hood
top panel underneath the edge of the blower
cabinet top.
The edge of the air hood top panel must be
between the blower cabinet top and the end panel.
Reinsert
all of the sheetmetal screws.
2. Side Panels
- Slide the air hood right side panel into the groove
in the blower cabinet end panel. Be sure that the side panel is
underneath and to the inside of the air hood top panel. Attach to
the blower cabinet and the air hood top using the required num-
ber of sheetmetal screws. Repeat with the left side panel.
inches
mm
75,100,125
53-3/8
1356
150,175
34-1/8
867
200,225
39-5/8
1006
250,300
47-7/8
1216
350
53-3/8
1356
400
58-7/8
1495
Width of Outside Air Hood
Size
