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CRV-S
F
C
I
ERIES
UEL
ONVERSION
NSTRUCTIONS
Step 5.4 Changing the Orifice
1. Remove the plug in the mixing chamber with a
7/16" open end wrench and set aside for
replacement.
2. Remove and discard the gas orifice using a 1/4"
hex key.
3. Apply a small amount of pipe sealant to the
threads of the replacement orifice included with
this kit (See Page 8, Table 1 to verify orifice
color). Be aware that over application of sealant
may cause blockage of the orifice. Insert and
tighten the replacement orifice.
CAUTION: Do not over-tighten the orifice. The
torque value for the orifice is 15 in/lbs; contact
your factory representative for more details.
NOTE: Insure that the gas orifice color matches
the color chart below for the model and gas of
the unit you are converting.
Table 1: Orifice Identification
CRV-B/E Model
Natural
2
Brass
4
Yellow
6
Pink
8
Blue
9
w/R400 Brown
9
w/R500 Silver
10
w/R400 Dark Green
10
w/R500 White
12A
Gray (also need #11
(See Note)
shutter)
12
-
(See Note)
4. When converting the CRV-B/E-12 or CRV-B/E-
12A, the air shutter must be changed: Using a 9/
64" hex key, remove the screw and shutter and
replace with the new one supplied with the kit.
5. Replace the plug in the mixing chamber.
6. If the burner is removed, re-install the gasket
and the burner on the combustion chamber.
Reconnect outside air, gas and electrical
supplies. For proper installation procedures, see
venting, gas piping and electrical sections of the
Installation, Operation and Service Manual
included in this Conversion Kit.
Step 5.5
Check Operation of the Unit
1. Turn on gas and electrical power to system and
unit.
2. Cycle thermostat.
8 of 21
3. When unit cycles, the spark ignitor should ignite
4. Observe the flame quality: look for a steady
5. Replace doors and wing screws.
6. Do Not Adjust The Zero Regulator.
Propane
Not available
Red
Yellow
Pink
Red
Red
Green
Green
-
Black (also need #12
shutter)
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.
the main flame immediately.
NOTE: When converting from natural to
propane gas, there may be a delay until the gas
is purged from the system.
even flame with no pull-off from the burner face
(indicating a lean condition) or a bushy green
flame (indicating rich mixture).
NOTE: The manifold pressure, as listed on the
serial plate and on the gas conversion plate
(See Page 11, Figure 8), for CORAYVAC® is
always -0.7" w.c. This is a nominal figure derived
using a CRV-B-10 Natural Gas unit under
laboratory conditions. The actual manifold
pressure will vary from 0" w.c. to -1.5" w.c. or
more depending on the system configuration,
system vacuum and burner rate and location.
Manifold pressure, or vacuum at the orifice, is
normally less negative then the system or "end
vent vacuum" while the unit is operating. If any
step is unclear, please contact your Roberts-
Gordon or ROBERTS GORDON® independent
distributor.
WARNING
Severe Injury Hazard
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