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Caution – Burnham ALP150 User Manual

Page 86

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86

b. Equivalent system freeze protection products

may be used in lieu of product referenced
above. In general, freeze protection for new or
existing systems must use specially formulated
glycol, which contains inhibitors, preventing
the glycol from attacking the metallic system

components. Insure that system fluid contains
proper glycol concentration and inhibitor level.
The system should be tested at least once a year
and as recommended by the manufacturer of the
glycol solution. Allowance should be made for
expansion of the glycol solution.

CaUTiOn

Use only inhibited propylene glycol solutions

specifically formulated for hydronic systems.
Do not use ethylene glycol, which is toxic and
can attack gaskets and seals used in hydronic
systems.

E.

Condensate Overflow Switch and Condensate Trap
Removal and Replacement:

For removal or replacement of the condensate overflow
switch and/or condensate trap follow the steps below.

For parts identification, refer to Section XV “Repair
Parts”.
1. Condensate Overflow Switch Removal and

Replacement:
a. Disconnect power supply to boiler.
b. Remove two (2) wire nuts and disconnect

overflow switch wire pigtails from boiler wiring.

c. Using pliers, release spring clip securing the

overflow switch to condensate trap body and
remove the switch. Note that the switch has
factory applied silicon adhesive seal, which may
have to be carefully cut all around to facilitate
the switch removal.

d. Insure the trap overflow switch port is not

obstructed with silicon seal debris, clean as
needed.

e.

Apply silicon seal to the replacement switch
threads and install the switch into the trap

body making sure it is properly oriented - the
arrow molded into the switch hex end side
must face down for proper switch operation.

See Figure 57 “Condensate Overflow Switch
Orientation” for details.

f. Reconnect the switch wire pigtails to the boiler

wiring and secure with wire nuts.

g. Restore power supply to boiler. Fill up the trap

(see Section V “Condensate Disposal”) and
verify the switch operation.

2. Condensate Trap Removal and Reinstallation:

a. Disconnect power supply to boiler.
b. Remove two (2) wire nuts and disconnect

overflow switch wire pigtails from boiler wiring.

c. Disconnect pressure switch hose from

condensate trap.

d. Disconnect outside condensate compression

fitting from condensate trap stab.

e. Using pliers, release spring clip securing the

overflow switch to condensate trap body and
remove the switch. Note that the switch has
factory applied silicon adhesive seal, which may
have to be carefully cut all around to facilitate
the switch removal.

f. Using pliers, release spring clip securing

condensate trap body to the heat exchanger
bottom drain stab.

g. Firstly, pull the trap downwards to release from

the heat exchanger bottom drain stab; secondly,
pull the trap end from left side jacket panel
sealing grommet and remove the trap from
boiler.

h. To reinstall the trap, reverse above steps.
i. If the original condensate overflow switch is

to be re-used, follow the appropriate switch

removal steps from Condensate Overflow Switch
Removal and Replacement procedure above.

j. Insure that fresh silicon sealant is applied to

the overflow switch threads, and the switch is

properly oriented relative to the trap body -
the arrow molded into the switch hex side end
must face down for proper switch operation.

See Figure 57 “Condensate Overflow Switch
Orientation” for details. Insure that pressure
switch hose is reconnected to the trap.

k. Restore power supply to boiler. Fill up the trap

(see Section V “Condensate Disposal”) and
verify the switch operation.

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