Raypak 405B Operations Instructions Page 36
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TUBE CLEANING PROCEDURE
Establish a regular inspection schedule, frequency de-
pending on local water condition and severity of service.
Do not let the tubes clog up solidly. Clean out deposits
over 1/16" in thickness.
The heater may be cleaned from the return header side,
without breaking pipe connections. It is preferable,
however, to remove both headers for better visibility
through the tubes and to be sure the ground-up lime dust
does not get into the system.
Note that you do not remove the top panel or the heater
exchanger, generally.
After reaming, mount the wire brush in place of the auger
and clean out debris remaining in the tubes.
Another method is to remove the heat exchanger, ream
tubes and immerse heat exchanger in non-inhibited de-
scale solvent for severe scale buildup.
DESOOTING PROCEDURE
Soot will clog areas between fins and cause eventual tube
failure. Any sign of soot at the base of the burners or
around the outer jacket indicates a need for cleaning.
1. Remove top and flue collector from cabinet.
2. Remove "V" baffles from heat exchanger.
3. Remove burner drawer. (See burner tray removal).
4. Remove heat exchanger from the heater and wash
with a garden hose, making sure soot is removed
from spaces between fins.
5. Reverse above procedure to reinstall.
NOTE: In extreme cases it may be necessary to do
steam cleaning at the local car wash. DO NOT WIRE
BRUSH.
COMBUSTION CHAMBER REMOVAL
To remove combustion chamber, you must first have
removed the heat exchanger. Unbolt metal combustion
chamber retainer from top and remove combustion cham-
ber panels individually.
REFRACTORY PANELS-TOP VIEW
Extension Pieces (2) Auger with Carbide Tip Wire Brush
Fig. # 8154.0
36
IMMERSION WELL REPLACEMENT
(Millivolt and ASME)
1. Shut water off to heater and drain heat exchanger.
2. Remove access panel on water connection side of
heater.
3. Remove old immersion well with bushing and sleeve.
4. Install in header.
NOTE: Installation in plastic should be hand tight plus
1/2 turn.
Well Assembly
Fig. #2010
UNITHERM GOVERNOR (U.G.) REPLACEMENT
1. Shut water, gas and electricity off, close valves and
relieve pressure.
2. Drain heat exchanger.
3. Remove retainer plug located next to the outlet pipe
connection.
4. Remove old U.G. from retainer plug. It is snapped in
place. Snap in new U.G.
5. Reinstall retainer plug, taking care to lubricate gas-
ket with a non-petroleum based grease such as
AquaLube.
Retainer Plug
U.G.
Spring
Gasket
Fig. #2011
To test the operation of the Unitherm Governor, place in
hot water (over 100°F) and watch for movement against
spring. If there is no movement, replace unit.
CAUTION: SOOT IS COMBUSTIBLE. EXERCISE
EXTREME CARE:
Fig. #RP 8155.0
- INSTALLATION 1
- AND OPERATING 1
- INSTRUCTIONS 1
- CONTENTS 3
- Fig.# 9478 4
- MILLIVOLT SYSTEM 5
- ELECTRONIC IGNITIONS SYSTEMS 6
- SECTION 2 - CAUTION 7
- SECTION 3 - MAINTENANCE AND 7
- CARE PROCEDURES 7
- IMPORTANT FREEZE INFORMATION 8
- Return Header 9
- Drain Plug 9
- For ASME Heaters only 9
- PART TWO 10
- (Drafthood) Back - 6" 11
- (Water Side) 11
- (Opposite Water side) 11
- Loose with 12
- Pagoda Top 12
- (Shipped 12
- ASSEMBLY PROCEDURE 13
- Fig # 9037.2 16
- VENT PIPING 17
- Fig. #2002.1 19
- Fig. # 8095.1 Fig. # 8097.1 20
- Fig. # 8093.1 20
- Fig. #2004 21
- Fig. # 8095.0 21
- Fig. # 8150.0ss 21
- Fig.#2003 21
- ELECTRICAL WIRING 24
- 120V WIRING 25
- 240V WIRING 25
- TRANSFORMER WIRING 25
- Fig. #RP 8267 29
- Fig #2005 29
- Fig.# 9472 29
- Fig. #9473 29
- DIGITAL THERMOSTAT CONTROLS 30
- Fig# 9482 31
- Fig# 9485 31
- Fig# 9494 32
- Fig# 9480 32
- REMOTE CONTROL WIRING 33
- Adjustment 34
- PRESSURE SWITCH 34
- ADJUSTMENT RANGE 34
- Pilot Pilot 35
- Orifice 35
- Well Assembly 36
- Retainer Plug 36
- LOW NOx POOL HEATERS 37
- LOW NOX HEATERS (CONTINUED) 38
- PROBLEM CAUSE SOLUTION 39
- RAYPAK POOL OR SPA HEATER 40
- Low NOx BURNER TRAY 45
- PILOT ASSEMBLIES 45
- Litho in U.S.A 52
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