LAARS Mini-Therm JVS (Sizes 50-225) - Users Manual - Manual (Page 3)

Page 3 Mini-Therm JV
problems. As soon as any fouling is observed, the
cause of the fouling should be corrected.
The heat exchanger can be checked using a
flashlight by locating a mirror under the burners.
An alternate method is to remove the venting and
top panel as necessary to inspect from above.
Also, check the vent system for defects at this
time.
If cleaning is required:
a. Shut off all power to the boiler.
b. Expose the heat exchanger by removing the
draft hood (when equipped), and venting, top
assembly, flue collector, and heat exchanger
baffles.
c. Remove the burners by lifting them off the
orifices and pulling them out of the boiler.
For JVH models, pull out the burner tray after
removing the attaching screws.
d. Use a hand-operated spray bottle filled with
water and a wire brush to clean any soot and
loose scale from the underside of the heat
exchanger. Do not use compressed air, high
pressure water or a garden hose.
e. Clean any fallen debris from the bottom of the
unit.
f. Check to make sure that the burner ports
and pilot assembly are free of debris before
returning the burners to their original
positions.
g. Reassemble the boiler in reverse order, making
sure to replace the heat exchanger baffles.
9. The gas and electric controls installed on the
boiler are engineered for both dependable
operation and long life, but the safety of this
equipment completely depends on their proper
functioning. For this reason, it is strongly
recommended that the basic items be checked by
a competent service technician every year and
replaced when necessary.
Figure 4 - Pilot Arrangements
1) JVS pilot
2) JVH pilot
3) Main burner flame pattern
The basic controls are:
a. Water temperature controls
b. Pilot safety system
c. Automatic electric gas valve(s)
d. Inducer/blower assembly (JVH )
e. Fan proving pressure switch (JVH )
f. Flue or vent damper
10. The blocked vent safety switch (JVS model only)
is used to shut the boiler down in the case of
insufficient draft due to venting system problems.
Before resetting the blocked vent safety switch
see the Appendix in Section 8D of the Installation
and Operating Instructions (Document number
1254) to ensure that all possible causes have
been investigated and corrected. If the problem
continues and the boiler cannot be restored to
normal operation call a qualified service agency.
11. The flame rollout safety switch provides
additional safety, and will shut down the
boiler should the flame from the main burners
rollout (flashback) towards the main gas valve.
Before resetting the flame rollout switch, see
Section 8D of the Installation and Operating
Instructions, (Document H2355800- for the JVS
model) to ensure that all possible causes have
been investigated and corrected. If the problem
continues and the boiler cannot be restored to
normal operation call a qualified service agency.
Never attempt to bypass the flame roll-out safety
switch for the purpose of operating the boiler.
Do not use this boiler if any part has been under
water. Immediately call a qualified service
technician to inspect the boiler and to replace any
part of the control system and any gas control
which has been under water.
12. Check all heat exchanger water connections,
flange or header gaskets for water tight integrity
24 hours after commissioning. If there are any
signs of water leakage, re-torque fasteners or re-
seat threaded connections as necessary
NOTE: The warranty does not cover any damage
caused by lack of required maintenance or improper
operating practices.
NOTE: After installation and first start-up, check
the heat exchanger for fouling after the following
periods of operation:
24 hours 30 days
7 days 90 days+
Then once every six months thereafter.