30
441 01 2613 05
Specifications are subject to change without notice
Figure 33
Manifold
25-25-00
Some Models may vary
9. After reassembling, turn gas on and check all joints for gas
leaks using a soapy solution. All leaks must be repaired
immediately.
Figure 34
Clearances
Measure from face of orifice to the
back side of the manifold.
1.11
″
(28.2mm)
1.21
″
(30.8mm)
Propane Conversion
An accessory kit shall be used to convert to propane gas use, see
the furnace rating plate for the Propane conversion accessory kit
part number.
CARBON MONOXIDE POISONING HAZARD
Failure
to follow this warning may
result in
personal injury, death, and/or property
damage.
NOx inserts for use with Natural Gas units
ONLY. If Propane Gas is required, NOx inserts
must be removed.
!
CAUTION
FIRE, EXPLOSION, UNIT DAMAGE HAZARD
Failure
to follow this warning may
result in
personal injury, death, and/or property
damage.
A Propane conversion accessory kit is re-
quired when operating the furnace with
Propane gas.
!
WARNING
*8MPLs and N8MPLs contain NOx inserts.
FOR PROPANE CONVERSION REMOVE SCREWS THAT
SECURE THE NOX INSERT AND DISCARD INSERT.
Reinstall screws. See
Figure 36
NOTE:
It is very important to reinstall the NOx insert mounting
screws.
Figure 35
Removing NOx inserts
25-40-03
Main Burner Flame Check
Allow the furnace to run approximately 10 minutes. Then inspect
the main burner flames. See
Figure 36
.
Check for the following:
•
Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames
MUST NOT
have solid, yellow
tips.
•
Flames extending directly from burner into heat exchanger.
•
Flames do
NOT
touch sides of heat exchanger
If any problems with main burner flames are noted, it may be
necessary to adjust gas pressures or check for drafts.
Main Burner
Burner Face
10
!
10
!
78
Figure 36
NOTE: For Ignitor location see
Figure 37.
Ignitor Location in(mm)
Figure 37
5
/
16
(8)
1
/
4
(6.4)
2
1/
16
(52.4)
NOTE:
Flame sensor has a different orientation in all 050 models.
National Excelsior Company
www.excelsiorhvac.com
Subject to change without notice.