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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 uid 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
specically formulated for hydronic systems.
Do not use ethylene glycol, which is toxic and
can attack gaskets and seals used in hydronic
systems.
E. Condensate Overow Switch and Condensate Trap
Removal and Replacement:
For removal or replacement of the condensate overow
switch and/or condensate trap follow the steps below.
For parts identication, refer to Section XV “Repair
Parts”.
1. Condensate Overow Switch Removal and
Replacement:
a. Disconnect power supply to boiler.
b. Remove two (2) wire nuts and disconnect
overow switch wire pigtails from boiler wiring.
c. Using pliers, release spring clip securing the
overow 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 overow 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 Overow 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
overow switch wire pigtails from boiler wiring.
c. Disconnect pressure switch hose from
condensate trap.
d. Disconnect outside condensate compression
tting from condensate trap stab.
e. Using pliers, release spring clip securing the
overow 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 overow switch is
to be re-used, follow the appropriate switch
removal steps from Condensate Overow Switch
Removal and Replacement procedure above.
j. Insure that fresh silicon sealant is applied to
the overow 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 Overow 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.