Roberts Gorden CORAYVAC CRVB04PN, Instructions Manual

Page: 9 / 30

SECTION 5: F
UEL
C
ONVERSION
I
NSTRUCTIONS
5 of 21
SECTION 5: FUEL CONVERSION INSTRUCTIONS
5.1 Introduction
The CORAYVAC
®
burners operate with a "zero"
regulator for both propane and natural gas; they are
factory set on a special flow bench. Since each unit
uses the same regulator, no spring changes or
adjustments are necessary when converting a
CORAYVAC
®
burner. Do not Adjust The Zero
Regulator.
Three separate conditions exist for converting
between gases:
1. The CRV-B/E series, with the exception of the
CRV-B/E-12 abd CRV-B/E-12A, are converted
by changing the orificeorifice only.
2. The CRV-B/E-12 and the CRV-B/E-12A require
a change of the primary air shutter in addition to
the orifice.
3. The CRV-B-2 is not convertable.
NOTE: There have been two different zero regulators
used in the CRV-B/E-9 and CRV-B-10 burners. The
type of zero regulator used will determine the orifice
needed. If you are converting a CRV-B/E-9 or CRV-
B-10 from propane to natural gas, determine which
regulator is being used in your burner (see below)
The Smaller Maxitrol R-400 regulator was in use
beginning in 1991 and ending in March 1996 and
was replaced exclusively by the R-500 at this time.
The R-400 measures approximately 2" x 2" x 3"; the
R-500 measures 3" x 3" x 4" 1/2". Each is clearly
marked with the model number.
See Page 9, Figure
6 , for regulator location.
If R-400 regulator is installed use brown orifice (P/N
02791004) for CRV-B/E-9, dark green orifice (P/N
02791003) for CRV-B/E-10. If R-500 regulator is
installed use silver orifice (P/N 02791006) for CRV-B/
E-9, white orifice (P/N 02791007) for CRV-B-/E-10.
It may be easier to remove the burner to a
workbench; however, it can be converted in place. If
you are converting the burner in place, skip to
Step 5.3 . If the orifice falls off of the hex key into the
mixing chamber, it will be necessary to remove the
unit to get the orifice out. It is best to use a sharp
(new) hex key which will fit tightly into the orifice.
WARNING
Severe Injury Hazard
Secure burner to burner tube with nuts and
lockwashers.
Hang heater with materials with a minimum
working load of 75 lbs (33 kg).
Failure to follow these instructions can result
in death, injury or property damage.