Install Instructions

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XI. Service and Maintenance (continued)
WARNING
Poison Hazard. Use only inhibited propylene
glycol solutions specically formulated for
hydronic systems. Do not use ethylene glycol,
which is toxic and can attack gaskets and seals
used in hydronic systems. Use of ethylene
glycol could result in property damage, personal
injury or death.
E. Condensate Overow Switch and Condensate
Trap Removal and Replacement:
For removal or replacement of the condensate overow
switch and/or condensate trap follow the steps below. For
parts identication, refer to Section XIII “Repair Parts”.
1. Condensate Overow Switch Removal and
Replacement:
a. Disconnect power supply to boiler.
b. Remove 2 wire nuts and disconnect overow switch
wire pigtails from boiler wiring.
c. 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.
d. Insure the trap overow switch port is not obstructed
with silicon seal debris, clean as needed.
e. Apply silicon sealant 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 47
“Condensate Overow 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 2 wire nuts and disconnect overow switch
wire pigtails from boiler wiring.
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)
Header Temperature Sensor
Temperature versus Resistance
(P/N 101935-01 or 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
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