INSTALLATION AND OPERATION INSTRUCTIONS
10
IBC INDIRECT WATER HEATERS - ALL MODELS
TEMPERATURE
RESISTANCE
TEMPERATURE
RESISTANCE
°F
°C
Ω
°F
°C
Ω
30
-1
34,558
115
46
4,184
35
2
29,996
120
49
3,760
40
4
26,099
125
52
3,383
45
7
22,763
130
54
3,050
50
10
19,900
135
57
2,754
55
13
17,436
140
60
2,490
60
16
15,311
145
63
2,255
65
18
13,474
150
66
2,045
70
21
11,883
155
68
1,857
75
24
10,501
160
71
1,689
80
27
9,299
165
74
1,538
85
29
8,250
170
77
1,403
90
32
7,334
175
79
1,281
95
35
6,532
180
82
1,172
100
38
5,828
185
85
1,073
105
41
5,210
190
88
983
110
43
4,665
195
91
903
Table 4: Temperature Sensor resistance values
5) - Operation
Startup
After the water heater has been plumbed and wired, and the boiler water piping
is purged of air, the water heater is ready to be started.
1. Follow the boiler installation instructions to place the boiler in operation.
2. In the “Installer Setup Menu”, go to “Heat Load Configuration” and “Define
Load 1” as DHW. Move to “Configure Load 1” and enter the appropriate
values for the system you are working with.
3. When the actual tank temperature is below the DHW “Tank Set Point”
temperature, the boiler will turn on the DHW pump or valve and fire up its
burner. It will then throttle up in order to raise the boiler water temperature to
the “DHW Supply Set Point” temperature. As the tank heats, the boiler will
throttle down, and when the tank temperature reaches Set Point, the boiler
will shut off (if there are no other loads calling for heat) and turn off the DHW
pumps and/or valves.
4. If the boiler switches over to satisfy other heating loads, and the tank
temperature falls below the Tank Set Point temperature, it will return to DHW
operation if the DHW Priority setting is higher than the other heating loads.
Temperature Adjustment
The tank sensor controls the maximum water temperature in the water heater. If
it is set too high, the resulting hot water can cause painful scalding with possible
serious and permanent injury. The temperature at which this occurs varies with
a person’s age, and the length of time in contact with the hot water. The slower
response time of infants, older, or handicapped people increases the hazard for
them.
WARNING
IBC water heaters are
supplied with a 10kΩ
thermistor sensor to be
inserted into the temperature
well of the tank, and secured
with a retainer clip or cap.
The thermistor must be solidy
affixed so as to prevent it
from falling out or being
pulled out. If the sensor
is pulled out of the well, a
continuous call for hot water
will be generated, resulting in
elevated tank temperatures
and risk of scalding.
NOTE
When programming the IBC
DHW load in the Configure
Load Menu, there are three
critical settings that will result
in satisfactory operation.
DHW Supply Set Point
The temperature to which the
boiler heats the water that it
sends into the Water heater coil.
Must be at least 20°F higher
than the DHW Tank Set Point
temperature.
DHW Tank Set Point
The temperature the end
user gets from the faucet.
Recommended to be no higher
than 120°F to prevent scalding.
Maximum Supply Temp
The highest DHW Supply Set
Point temperature the boiler will
allow.
Should be at least 20°F
higher than the DHW Supply
Set Point temperature.
Supply Diff’l Temp
The variance the control allows
in the DHW Supply Set Point.
Trial setting of 20°F. Set higher
to reduce short-cycling around
the DHW Supply Set Point.
Tank Diff’l Temp
The variance the control allows
in the DHW Tank Set Point.
Trial
setting of 10°F. Set lower for
tighter Tank temperature control.
