Burnham ALPINE - Page 113

113
XIII. Service and Maintenance (continued)
Outdoor Temperature
Ohms of
Resistance
°F °C
-20 -28.9 106926
-10 -23.3 80485
0 -17.8 61246
10 -12.2 47092
20 -6.7 36519
30 -1.1 28558
40 4.4 22537
50 10.0 17926
60 15.6 14356
70 21.1 11578
76 24.4 10210
78 25.6 9795
80 26.7 9398
90 32.2 7672
100 37.8 6301
110 43.3 5203
120 48.9 4317
Outdoor Air Temperature Sensor
Temperature versus Resistance
(P/N 102946-01)
(10kOhm NTC Sensor)
Temperature Ohms of
Resistance
°F °C
32 0 36100
50 10 22790
68 20 14770
77 25 12000
86 30 9810
104 40 6653
122 50 4610
140 60 3250
158 70 2340
176 80 1710
194 90 1270
212 100 950
230 110 730
248 120 560
Supply, Return and Stack Temperature Sensor
Temperature versus Resistance
(12kOhm NTC Sensor), Beta of 3750
Header Temperature Sensor
Temperature versus Resistance
(P/N
103104-01)
(10kOhm NTC Sensor), Beta of 3950
Temperature Ohms of
Resistance
°F °C
32 0 32648
50 10 19898
68 20 12492
77 25 10000
86 30 8057
104 40 5327
122 50 3602
140 60 2488
158 70 1752
176 80 1256
194 90 916
212 100 697
248 120 386
e. Using pliers, release spring clip securing the
overow 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 overow switch is
to be re-used, follow the appropriate switch
removal steps from Condensate Overow Switch
Removal and Replacement procedure above.
j. Insure that fresh silicon sealant is applied to
the overow 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 59 “Condensate Overow 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.