Thermo BTH Ultra - Page 26

BTH ULTRA Electric Boilers Installation & Operation manual (Revision: May 2015) 24 .
the thermostat is not in demand.
(Systems with more than one
thermostat)
valves, one or many end
switches included in the valve is
defective.
-A jumper has been installed on
terminals TT of the boiler
-Make appropriate connections as
shown in fig.7
An overheated plastic odour is
released from the boiler
Turn the power OFF to the boiler.
Open the front and left side panel
of the boiler. Check the
components and electric wires
for indications of overheating.
Replace overheated components and
check supply voltage to the boiler.
Boiler safety valve is leaking -Pressure reading at the indicator
shows a pressure above 28psi
-Pressure is below 28psi
-The pressure regulator on the
distribution system is defective or the
expansion tank is too small or
defective.
-Replace the safety valve
Table 7: Resistance value of the outdoor sensor vs outdoor temperature
Température
Résistance
Température
Résistance
Température
Résistance
Température
Résistance
°F °C Ω °F °C Ω °F °C Ω °F °C Ω
-50 -46 490,813 20 -7 46,218 90 32 7,334 160 71 1,689
-45 -43 405,71 25 -4 39,913 95 35 6,532 165 74 1,538
-40 -40 336,606 30 -1 34,558 100 38 5,826 170 77 1,403
-35 -37 280,279 35 2 29,996 105 41 5,21 175 79 1,281
-30 -34 234,196 40 4 26,099 110 43 4,665 180 82 1,172
-25 -32 196,358 45 7 22,763 115 46 4,184 185 85 1,073
-20 -29 165,18 50 10 19,9 120 49 3,76 190 88 983
-15 -26 139,402 55 13 17,436 125 52 3,383 195 91 903
-10 -23 118,018 60 16 15,311 130 54 3,05 200 93 829
-5 -21 100,221 65 18 13,474 135 57 2,754 205 96 763
0 -18 85,362 70 21 11,883 140 60 2,49 210 99 703
5 -15 72,918 75 24 10,501 145 63 2,255 215 102 648
10 -12 62,465 80 27 9,299 150 66 2,045 220 104 598
15 -9 53,658 85 29 8,25 155 68 1,857 225 107 553