Burnham ALPINE Installation, Operation And Service Instructions page 112

Xiii. Service and Maintenance (continued)
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.
Condensate Overflow Switch and Condensate Trap
E.
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.
112
Figure 59: Condensate Overflow Switch Orientation
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 59 "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.