Camus Hydronics DRH300, Installation, Operation And Service Manual

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PART 10 MAINTANANCE
CAUTION
It is important that all gas appliances to be serviced by a
Camus® trained service technician. It is in your own
interest and that of safety to ensure that all local codes,
and all the “NOTES” and “WARNINGS” in this manual are
complied with. To service or adjust this appliance, it is
imperative that the Camus® trained service technician
utilize a combustion analyzer to read CO
2
, CO and flue
pressure according to Camus® Hydronics recommendation
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation, verify proper operation after servicing.
Listed below are items that must be checked to ensure safe
reliable operations. Verify proper operation after servicing.
10.1 EXAMINE THE VENTING SYSTEM
Examine the venting system at least once a year. Check
more often in the first year to determine inspection interval.
Check all joints and pipe connections for tightness,
corrosion or deterioration. Flush the condensate drain hose
with water to clean. Clean screens in the venting air intake
system as required. Have the entire system, including the
venting system, periodically inspected by a qualified service
agency.
10.2 VISUALLY CHECK MAIN BURNER
FLAMES
At each start up after long shutdown periods or at least
every six months. A burner view port is located on the
burner mounting flange.
CAUTION
The area around the burner view port is hot and direct
contact could result in burns.
NOTE
Check torque on fan mounting nuts using a torque wrench.
DR300 – 1000: 20 lb-ft
DR1200 – 5000: 25 lb-ft
Figure 36: Normal Burner Flame Profile (short dense and
blue)
•
Normal Flame: A normal flame at 100% of burner input
is blue, with slight yellow tips a well defined flame and
no flame lifting.
•
Yellow Tip: Yellow tipping can be caused by blockage
or partial obstruction of air flow to the burner.
•
Yellow Flames: Yellow flames can be caused by
blockage of primary air flow to the burner or excessive
gas input. This condition MUST be corrected
immediately.
•
Lifting Flames: Lifting flames can be caused by over
firing the burner, excessive primary air or high draft in
excess of negative 0.15” W.C.
If improper flame is observed, examine the venting system;
ensure proper gas supply and adequate supply of
combustion and ventilation air.
10.3 FLUE GAS PASSAGEWAYS CLEANING
PROCEDURES
Any sign of soot around the jacket, flue pipe connections,
burner or in the areas between the fins on the stainless
steel heat exchanger indicates a need for cleaning. The
following cleaning procedure must only be performed by a
Camus® trained service technician. Proper service is
required to maintain safe operation. Properly installed and
adjusted units seldom need flue cleaning.
All gaskets/sealant on disassembled components or jacket
panels must be replaced with new gaskets/sealant on re-
assembly. Gasket and sealant kits are available from the
factory
CAUTION
When the vent system is disconnected for any reason it must
be
reassembled and resealed according to vent
manufacturer’s instruction
10.4 CONDENSATION TREATMENT
This high efficiency appliance may operate as a condensing
appliance for extended periods of time based on return
water temperatures. Condensate occurs when the products
of combustion are cooled below their dew point in the heat
transfer process. The liquid condensate formed from this
high efficiency heat transfer process is mildly acidic. The
condensate will typically have a pH ranging from 4.0 to 5.0
as it is discharged from the condensate drain at the rear of
the appliance. The condensate trap where condensate is
collected is constructed from a corrosion resistant stainless
steel. All materials external to the appliance in contact with
the condensate must be corrosion resistant. This is typically
accomplished by using PVC or CPVC plastic pipe and
synthetic tubing. Condensate must be able to flow freely
from the appliance. All condensate flow is accomplished by
gravity requiring a minimum downward slope of 1/4” per
foot (21mm/m) to ensure proper flow to the condensate
management system and/or a suitable drain. The
neutralizer MUST always be mounted on the same level or
lower than the bottom of the appliance cabinet and
downstream of the condensate trap. The condensate trap is
located external of the boiler and is to be secured to the
floor or boiler pad to prevent spillage of condensate water.
All condensate piping and connections must be easily
accessible for routine maintenance and inspection.