LAARS Heat Exchanger - Installation Manual - Manual

Accessories & Parts Document 4043H
Heat Exchanger Replacement
Gas-Fired Hydronic Boilers, Volume Water and Pool Heaters
Sizes 175,000 - 5,000,000 BTU/hr.
AJ, AL, AQ 500-1666
AP 500-1825
For Models:
LC 154-3000
LJ, LL, LQ 500-4000
HK, LK 250-400
HB, LCR 154-560
VW, HH 500-1825
VW, HH 2000-5000
AF 420-3000
AL 1866-4000
AP 2200-4000
AP 2000-5000
BARRIER
SPECIAL BYPASS ASSEMBLY
PUMP DISCHARGE BAFFLE
NJ, NL, NQ 500-1666
PW, PH 500-1825
SJ, SL, SQ 500-1666
IW 500-1825
HB, LCR 630-3000
HJ, HL, HQ 500-4000
LJ, LL, LQ 500-4000
VW, HH 2000-5000
SK 250-400
SC 560-3000
PUMP DISCHARGE BAFFLE
RJ, RL, RQ 500-1666
MJ, ML, MQ 500-1666
with rear mounted pump
RB 560-1190
RJ, RL 500-1666
MJ, ML 500-1666
MK 250-400
BARRIER WITH HOLE
BARRIER
SUCTION DIFFUSER
PUMP DISCHARGE BAFFLE
(in pump adapter)
SUCTION DIFFUSER
PUMP DISCHARGE BAFFLE
(in pump adapter)
SUCTION DIFFUSER
PUMP DISCHARGE BAFFLE
(in pump adapter)
NC 154-3000
NK 250-400
BARRIER
To Remove Heat Exchanger:
1. Turn off all electrical power to the heater.
2. Disconnect the water piping from the header.
3. Remove the vent, draft diverter, and flue extension.
4. Remove the jacket top, which is secured with sheet metal
screws.
5. Withdraw the flue collector, which is held in place with
cement or metal
screws.
6. Remove the sheet
metal strips, if
present on your
model, across the
ends of the heater
above the headers.
7. Remove the capillary
tubing going to the
thermostat bulb and
high limit switch bulb.
If the heat exchanger
is to be reversed, the existing tubing will have to be replaced
with longer tubing.
8. On heaters equipped with a mounted pump on the side of the
jacket, remove the screws holding the bracket. Maintain the
pump, bracket, and heat exchanger as one unit. Disconnect
all electrical wiring.
9. Remove the front and rear tile covers.
Lift out the heat exchanger. It may have to be jiggled carefully
to break the furnace cement seal.
To Reinstall the Heat Exchanger:
1. Coat the upper surfaces of the side tiles with furnace cement
before carefully lowering the heat exchanger into place.
2. Verify that all of the "V" and "T" baffles are properly installed
between the heat exchanger tubes. Also, be sure end refrac-
tory tiles fit inside of the casting ribs and seal on the flat part
of the casting.
3. Replace the front and rear tile covers.
4. Repeat steps 1 through 8 of the removal procedure in reverse
order to complete the installation.
Water Barrier Position
Water barrier must be installed as shown in diagrams at right or
warranty is void. The diverter plate must be reinstalled between
the tub and header cover on the inlet side of the heat exchanger.
When replacing a heat exchanger, the water barrier must
be installed to ensure a proper fit with the replacement heat
exchanger. Water barrier p/n for I/E 500-1825 and Q boilers
500-1666 is 20230101. Water barrier p/n for LB 2000-5000 is
20230100.
A subsidiary of Corporation BRADFORD WHITE
Heating Systems Company
H0062400H
800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com Litho in U.S.A. © Laars Heating Systems 0806 Document 4043H