BTH 300 test after installation at experimental decon facility
Christmas day, Thu Dec 25, approximately 16:30:00 EST 2003, when the building
was relatively empty (not too much demand for hot water),
the following time-temperature test was conducted by noting
the time as soon as the temperature changed (fluctuations were ignored,
and the time indicates peak temperature, e.g. the highest number so far
observed):
time/min:sec temperature/degF
0:00 095
0:04 096
0:19 097
0:25 098
0:33 099
0:41 100
1:01 101
1:15 102
1:24 103
1:30 104
1:39 105
2:00 106
2:20 107
2:28 108
2:30 109
2:35 110
2:58 111
3:13 112
3:28 113
3:35 114
3:57 115
4:11 116
4:15 117
4:21 118
4:35 119
4:57 120
5:09 121
5:20 122
5:31 123
5:34 122
5:36 123
5:41 124
5:59 125
6:16 126
6:30 127
6:40 128
6:50 129
6:54 130
6:58 131
7:15 132
7:28 133
7:38 134
8:14 135
8:24 136
8:31 137
8:37 138
9:00 139
9:13 140
9:16 141
9:23 142
9:36 143
Octave command used to generate the above:
fprintf("time/min:sec temperature/degF\n");fprintf("%01d:%02d %03d\n",data')
Additional observations (including differences with BTH300):
- The "roaring" sound of the unit seems quiet, compared to the BTH199
(e.g. the unit runs quieter, and cannot always be heard from within
the building);
- The blower seems to run at different speeds (perhaps it's a variable
speed motor);
- Whenever the motor starts it seems to take an exploratory run,
e.g. spins up, spins down, then starts again and stays on until the
temperature is raised;
- Temperature cycles from 124degF, to 142degF (this appears to be the
default setting);
- There is a very brief high-pitched squeal whenever the temperature
hits 137degF. Perhaps this is the flame going out when the
target temperature is reached?
- At 139degF the motor winds down and shuts off;
- Temperature continues to climb to 143degF or so, even though the
motor (and presumably the flame) are off (out). This could perhaps
be due to thermal inertia (i.e. residual heat).