Install Instructions
Prepare boiler for propane —
ECO 70/110 only (if required)
Propane operation
!,, %#/ BOILERSMUSTBE CONVERTED FOR
PROPANEOPERATION
.
#ONVERTINGANEXISTINGNATURALGASlREDBOILER
FORPROPANE
— For a boiler already installed, you
must turn off gas supply, turn off power and allow
boiler to cool before proceeding. You must also
completely test the boiler after conversion to verify
performance and start up the boiler following in-
structions beginning on page 75 of this manual.
6ERIFYPROPANEGASORIlCEBUSHING —
See Figure 10. Verify when installing that the orifice
size marking is correct. Bushings will be stamped as
in illustration or with “3.85” for model 70 and “4.45”
for model 110.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Installing propane orifice bushing —
ECO 70/110 only
)FBOILERISALREADYINSTALLED — You must turn off elec-
trical supply to the boiler and close the external manual
gas shut-off valve to isolate the boiler during conversion.
Allow the boiler to cool if it has been operating.
Following conversion of an installed boiler, follow all
instructions in this manual to start up the boiler and
verify operation of the boiler and all system components.
1. Locate the propane orifice bushing from the propane conversion
kit bag.
2. Verify that the stamping on the orifice bushing is correct for the
model size (see Figure 10).
3. If the jacket door is not already removed, remove it.
4. Locate the gas valve and venturi (see Figure 11).
5. Pull the gas valve retention ring (item 3, Figure 11) off of the gas
valve/venturi joint.
6. Carefully pull the gas valve to the right until it is free of the venturi.
Leave the pressure reference hose (item 4, Figure 11) connected
at both ends.
&IGURE Propane gas orifice bushing identification
%#/ 70 on left (may be stamped 3.85)
%#/ 110 on right (may be stamped 4.45)
&IGURE Gas valve and venturi
1 Gas valve
2 Venturi
3 Gas valve retention ring
4 Pressure reference hose — LEAVE CONNECTED AT BOTH
ENDS
Support the gas valve after disconnecting
it. DO NOT allow it to hang from the gas
valve flex line. When re-attaching the gas
valve, ensure the gas valve-to-venturi O-
ring (item 5, Figure 12, page 14) is in place
and in good condition. Inspect the gas valve
flex line to ensure it is undamaged and in
good condition.
Part number 550-142-122/0513
13
TM
GAS-FIRED WATER BOILER — Boiler Manual
Converting boiler to propane — ECO 70/110