UHA S
TANDARD
U
NIT
H
EATER
I
NSTALLATION
O
PERATION AND
S
ERVICE
M
ANUAL
38 of 59
and electrical supply. Remove the fan(s) and use a
small brush or duster to clean the fan blades from
each side. Replace fan when done. See Page 53,
Section 15.10.
13.4 Heat Exchanger Maintenance
The heat exchanger will remain clean unless a
problem has developed with combustion. Inspect the
heat exchanger. Look for signs of overheating at the
front tubes which may indicate burner over firing or
persistently low air flows.
13.5 Gas Valve Maintenance
No regular maintenance is required on this device.
To change gas control valves, See Page 46, Section
Do not repair or disassemble gas valve.
Replace faulty gas valves with genuine replacement
parts sold and supplied by Rapid Engineering LLC.
13.6 Flue Blower
The flue blower should not require maintenance.
However, if the air pressure switch is causing burner
lockout, then remove the flue blower from the vent
box by unscrewing the screws at the mounting plate.
Screw quantity will vary by model size. Remove the
screws attaching the mounting plate to the fan inlet
See Page 51, Section 15.6 through Page 52,
Section 15.7. Ensure that the fan is free to run and
that the fan wheel is clean.
13.7 Venting and Air Intake Pipe
Inspect all venting and air intake pipe. Ensure that
all seams are sealed and suspension points secure.
Repair suspension points if any part of the venting
or combustion air pipe is sagging. Check to make
sure any insulation is not missing or in poor
condition. Replace as necessary. Check all venting
and air intake components to ensure they are in
good condition, gas tight and corrosion-free.
13.8 Maintenance Checklist
Installation Code and Annual Inspections:
All
installations and service of RAPID
®
equipment must
be performed by a contractor qualified in the
installation and service equipment sold and supplied
by Rapid Engineering LLC and conform to all
requirements set forth in the RAPID
®
manuals and
all applicable governmental authorities pertaining to
the installation, service, operation and labeling of
the equipment.
To help facilitate optimum performance and safety,
Rapid Engineering LLC recommends that a qualified
contractor conduct, at a minimum, annual
inspections of your RAPID
®
equipment and perform
service where necessary, using only replacement
parts sold and supplied by Rapid Engineering LLC.
Annual Fall Start-Up
Follow entire start-up procedure at this time and check control settings and
operation.
The Vicinity of the Heater
Do not store or use flammable objects, liquids or vapors near the heater.
Immediately remove these items if they are present.
Vehicles and Other
Objects
Maintain the clearances to combustibles.
Do not hang anything from, or place anything on, the heater.
Make sure nothing is lodged in between the heat exchanger or in the louvers.
Immediately remove objects in violation of the clearances to combustibles.
Vent Pipe/Terminals
Venting must be intact. Using a flashlight, look for obstructions, cracks on the
pipe, gaps in the sealed areas or corrosion.
The area must be free of dirt and dust.
Remove any carbon deposits or scale using a wire brush.
If the vent terminal has a screen built in, remove any dirt, dust or deposits
from the screen.
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