EagleSun DTC-ES-1 Specification sheet

Alternate Energy Technologies, LLC.
1345 Energy Cove Ct · Green Cove Springs, FL 32043 · PH: 800-874-2190
EagleSun Systems
by Alternate Energy Technologies, LLC.
Delta-T Control / Energy Meter
Operation and Installation Manual
Model No. DTC-ES-1

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Table of Contents
Specifications 4
Inputs
Outputs
User Interface
Setup Menu
Operation 5
Holiday feature
BTU calculation
Communications
Troubleshooting 5
Installation 6
Warranty 8
Appendix 9
Temperature vs Resistance Conversion Chart for 10k Thermistors
IMPORTANT SAFETY INSTRUCTIONS
When using this electrical equipment, basic safety precautions should always be followed,
including the following:
READ AND FOLLOW ALL INSTRUCTIONS
Disconnect all AC power during installation.
If connecting a communications cable, it is recommended that the control be
unplugged from the electrical power supply.
Warning –To reduce the risk of injury, children should not be permitted to use this
product.
SAVE THESE INSTRUCTIONS

09/12 - Page 4
Delta-T Control / Energy Meter
The EagleSun Delta-T Control / Energy Meter is designed for use on a solar thermal system. It will monitor collector and storage water
temperature sensors and operate their respective water pump(s) in order to maintain desired differential temperature between them; integral
variable speed drive on the collector pump and turn on/off on the storage pump; read from the flow sensor and auxiliary (2) temperature
sensors to calculate the BTU; transmit data to the PC via RS-232 for the purpose of data logging and long term diagnostics; power and
transmit data to the remote display panel.
SPECIFICATIONS
Inputs
Line voltage; Power cord 115Vac (L, N, G), 15Amps
Collector sensor, COL 10k Thermistor, 5Vdc circuit
Storage sensor, STO 10k Thermistor, 5Vdc circuit
Auxiliary sensor 1, AUX1 10k Thermistor, 5Vdc circuit
Auxiliary sensor 2, AUX2 10k Thermistor, 5Vdc circuit
Flow sensor; FLO, FS, GND, 5V 5Vdc circuits
Outputs
Variable speed pump, VAR SPEED Phase controlled line voltage, Triac: 4Amps max
Fixed speed pump, FIXED SPEED Line voltage, Relay contacts: 20A (or 2HP motor)@240VAC, NO
Communication: COM 5Vdc power, TX (RS-232) at 10Vdc, RJ45 jack
User Interface
The control has three buttons used to navigate the values of the adjustable settings. The different temperature readings will be
displayed when pressing the MENU button (■) multiple times. The Setup menu is entered when the MENU button (■) is pressed and
held for 6 seconds. The UP button (▲) is used to increase the values of settings in the setup menu and the DOWN button (▼) is used
to decrease the values of the settings in the setup menu.
The control has 3 LED lights to indicate pump engagement, high limit temperature exceeded, and a fault. They are labeled as: PUMP,
UPPER LIMIT and FAULT.
The display is an LCD type with 2x16 characters, backlit for easy viewing in low-light conditions.
Setup Menu
The Setup menu is entered when the MENU button is pressed and held for 6 seconds. The following are the adjustable settings which
are modified in the Setup menu:
On Differential - the on differential temperature sets the desired temperature differential between the collector supply sensor and
storage tank sensor during running state. The setting is adjustable from 8°F to 24°. (Default is 8° F)
Off Differential - the off differential temperature sets the desired temperature differential during off state in order to turn on. The
setting is adjustable from 2°F to 8°F. (Default is 2° F) If the On Differential is set to 8° F, the maximum Off Differential is 7° F.
Storage Hi Limit –the storage high limit setting is used to control the maximum temperature desired in the storage tank. The
setting is adjustable from 110°F to 200°F. (Default is 150° F)
Collect Lo Limit –the collector low limit setting is used to control the minimum temperature required at the collector in order for
the pump(s) to energize. The setting is adjustable from OFF, 50°F to 70°F. (Default is 50° F)
Minimum Speed –the minimum variable speed setting controls the minimum operational speed of the collector pump. This
setting is % value of full speed and is adjustable from 20% to 50%. (Default is 30%)
Minimum Off Time –the minimum pump off time setting controls the minimum amount of time required before the pump can
be re-energized. This prevents short cycling of the pump during cloudy conditions. The setting is adjustable from 3 to 10 minutes.
(Default is 5 min)

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Flow Sensor –the flow sensor setting (VFS 1-20, VFS 2-40, VFS 5-100, VFS 10-200 and VFS 20-400) enables the AUX1
sensor terminal to accept temperature input from the flow sensor and enables BTU calculation. Alternatively, the Flow Sensor
setting will allow for manual adjustments between 0.0 and 106.0 gpm (in 0.1 increments). The installer must measure the actual
flow rate by using an ultrasonic flow meter, or similar equipment, before manually setting the control. (Default is 0.00 GPM –no
BTU calculation)
Drainback –the drainback setting alerts the controller to de-energize the pump(s) if the collector loop temperature exceeds
200°F. The setting is YES or NO. (Default is NO)
OPERATION
When initially energized, the control will flash an introductory screen showing the software version (shown below) and then the
default screen appears displaying collector and storage temperatures.
D
I
F
F
T
E
M
P
C
O
N
T
R
L
A
E
T
V
0
1
The control can operate in one of three modes: OFF, AUTO and ON. By pressing MENU button (■) the CONTROL MODE screen
will be reached. With Up and Down buttons the setting can be changed to OFF, AUTO or ON.
In OFF mode all outputs are turned off. This mode is useful for servicing. Limit conditions are not considered.
In AUTO mode the control operates automatically to reach and maintain desired temperature. All settings are considered. This
specification further describes the operation of the control in AUTO mode.
In ON mode the control turns on the pump(s) with collector pump at full speed. This mode is useful to purge air out of the system
on start up upon installation. Limit conditions are not considered.
The control will energize the pump(s) when the On Differential setting is exceeded. The green LED labeled PUMP turns on to indicate
when power to the pump(s) is present. The COL pump will run at full speed for a minimum of 30 seconds or until sufficient flow is
established. As the temperature differential decreases and gets within 6°F of the desired differential, the variable speed on the collector
pump is adjusted down by means of phase control. The minimum speed on the collector pump is dictated by the respective setting in
the Set Up menu. Minimum speed insures sufficient flow throughout the solar heating system and prevents the motor from
overheating. As the temperature differential increases the variable speed on the collector pump is adjusted up and crosses into full
speed. The minimum running time for the pump(s) is 2 minutes
When the temperature differential falls below the On Differential setting the pump(s) will shut off. The pump(s) will remain off for the
time period designated by the Pump Minimum off time setting.
Temperature sensor readings and the BTU are displayed by pressing MENU button one after another. After 15 seconds of inactivity
the screen with go back to display collector and storage temperature readings.
Holiday feature: when activated, this feature allows for continued pump operation above the storage high limit temperature, until the
temperatures fall off and the Holiday feature setting is reached. The recommended temperature setting is that of the backup electric
heat. The setting is accessed by pressing the MENU button (■) three (3) times and is adjustable from OFF to between 100 and 150°F.
BTU calculation: BTU’s are calculated using the following formula: BTU=FLOW (GPM) * 500 * (AUX2-AUX1). The flow rate
(GPM) is recorded automatically if a flow sensor is used (control input = VFS selection), else, the manual input value (X.Y GPM) is
used in the calculation. A manual input value of 0.0 results in no BTU’s recorded. Delta-T temperatures are derived from the AUX2
and AUX1 sensors terminals.
Communication: the control transmits data to the PC via built-in RS-232 in ASCII, 8-N-1 code for the following: pump run time,
control mode, collector and storage sensor temperatures, auxiliary 1 and 2 sensor temperatures, holiday feature, flow rate, BTU’s
calculated, differential hi/low settings, storage high limit setting, collector low limit setting, collector and storage pump status and
fault conditions. Power to the control should be disconnected prior to attaching/detaching the communications cable.
TROUBLESHOOTING
The control will not turn on the pumps or will shut them off if already running when either Storage or Collector probe is short or open.
The “short or open”message is displayed instead of temperature readings.
Auxiliary 1 or Auxiliary 2 probes do not disable control output if they are short or open. “Short or open”is displayed instead of
temperature readings.
If Flow sensor reading is out of range indicating short or open then the control will display the fault.

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The red LED labeled FAULT will be flashing either Storage or Collector probe is short or open.
When storage high temperature limit is reached the control will disengage the pumps to prevent the tank from overheating. The yellow
LED labeled UPPER LIMIT will turn steady on and the HIGH STORAGE TEMPERATURE condition is displayed alternating with
the default screen. Control resumes operation when storage tank temperature drops below the limit temperature.
Freeze protection applies when collector temperature sensor drops below 42°F and is terminated when it rises back to 52°F. During
freeze protection, fluid circulation is required to maintain non-freezing temperatures in the collector and interconnect piping. Freeze
Protection is displayed alternating with the default screen. Freeze protection is overridden when control is configured for drainback.
If the setting for Drainback is ON, the collector pump is turned OFF should collector sensor reading exceed 200°F
INSTALLATION
All wiring connections must be made in accordance with all applicable electrical codes. Overload and over-current protection of
electrically operated components shall be consistent with the maximum current rating of the device and with the provisions of Article
240, Chapter 2 of the National Electrical Code. Power to the control should remain un-connected until the unit is securely mounted
and all wiring is completed.
Operation and Storage conditions
Power supply: 120VAC +10%/-15%, 60Hz
Operating temperature: -32°F (0°C) to 140°F (60°C)
Storage temperature: -40°F (-40°C) to 185°F (85°C)
Humidity: 10%RH to 90%RH non-condensing
The control is to be mounted against or adjacent to the water storage tank in a dry, sheltered environment. The box is mounted using
two #6 screws (provided) spaced vertically, 7-9/16” apart. The control hangs on the mounting screws using the keyhole slots on the
reverse side of the control.
The control is equipped with distinct wiring blocks for communications (COM), sensor and pump wiring. Low voltage connects
(COM and sensors) are located on the side of the control, whereas, the pump connections (line voltage) are internal to the control and
labeled for variable and fixed speed functions (see Figure 1). Variable speed pumps should utilize the variable speed wiring and fixed
speed pumps should use the fixed speed connections.
Figure 1
The COM terminal is used to provide communications to an individual PC/Laptop, remote display or connection to a web-enabled
data transfer device used for online data viewing. The COM port accepts a standard CAT5e ethernet patch cable. For PC/Laptop
interface, the connection requires a cable adapter (as shown in Figure 2) connected to the DB9 serial port on the host computer. DO
NOT connect the communications cable to the internet port on the host PC as no data will be viewable.
Figure 2

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For remote display connections, the remote Energy Meter (as shown in Figure 3) accepts an RJ45 connector from the control unit.
NOTE: the patch cable is not included with either the control or remote display as the length will vary with the distance between the
units.
Figure 3 Figure 4
The control is designed for BTU measurement/recording using a Grundfos, type VFS, Vortex Flowsensors (as shown in Figure 4). The
flow sensor is to be plumbed into the feed line to the collector(s), within ten (10) pipe diameters from the storage tank and a minimum
of four (4) pipe diameters from an upstream bend in the plumbing. For flow sensor wiring, flow and temperature signals share the
same ground, therefore, only one wire (yellow) is required to connect across the sensor terminal. Secure the yellow wire to the AUX1
terminal adjacent to STO as indicated by the dot in Figure 1. Flow sensor wire connections are as follows:
Grundfos Direct Sensors: VFS 1-20, VFS 2-40, VFS 5-100, VFS 10-200 and VFS 20-400
Flow sensor wire
Color
Control terminal
Power supply (+5V DC)
Brown
5V Flow
GND (0 V)
Green
GND
Flow signal (0.5 to 3.5 V)
White
FS
Temperature signal (0.5 to 3.5V)
Yellow
AUX1 (terminal indicated by dot –Fig 1)
WARNING: DO NOT connect the GND (green) wire to the Pipe system as indicated in the graphic
on the Grundfos Data Sheet. Connect only to the GND terminal on the control wiring block.
A second sensor, 10k thermistor type, is required for BTU calculation and should be mounted within six (6) pipe diameters of the
storage tank on the return line from the collector(s) and connected to the AUX2 terminals on the control.
BTU measurement should always be taken from the pipe work leaving and entering the storage tank (as shown in Figure 5). This will
provide a measurement of the heat delivered to the storage tank. DO NOT use the wire leads from the storage tank or collector
mounted sensors as they are used to determine when the solar system energizes and de-energizes.
Figure 5

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Pump terminal selection will differ with flow sensor usage. When using the flow sensor option (VFS Select), use the VARIABLE
terminal connection as it offers variable speed operation and the control will automatically adjust the flow rate value for BTU
calculation. If the flow rate is manually input (X.Y GPM), use the FIXED terminal connection as this offers a constant speed operation
for a constant flow rate value when calculating BTUs. In two pump systems, the loop with he flow sensor should use the VARIABLE
terminal connections and the opposing loop pump should use the FIXED terminal connections. Alternatively, pump wiring can be
“daisy-chained” to allow for a fully fixed or fully variable 2-pump system operation.
WARRANTIES
Limited Warranty
This warranty statement is applicable to the EagleSun, DTC-ES-1 solar control distributed by Alternate Energy Technologies,
LLC, herein referred to as AET. See the appropriate warranty statement for other EagleSun products or solar controls.
Solar Controls installed in USA or Canada:
AET warrants its solar control, installed within the USA or Canada, to be free from defects in material or workmanship, under
normal use and service for five years from date of the initial system installation, provided it is installed in accordance with the
EagleSun Systems - Operation and Installation Manual provided with the product. If written proof of the date of the initial
system installation is not provided to AET, the Sales Order Invoice date will be the sole determinant of the date of the initial
system installation.
If a product is defective, in workmanship or materials and is removed and returned freight prepaid within three (3) years after the
date of the initial system installation, AET will, at its option, either repair or replace the defective product and return it freight
prepaid. If the defective product is returned freight prepaid to AET more than three (3) years but within five (5) years of the date
of the initial system installation, AET, at its option, will either repair or replace the defective product and will charge sixty
percent (60%) of the current list price for such repairs or replacements, plus shipping charges. The costs incurred in removal
and/or reinstallation of the product is NOT covered under this warranty.
Solar Controls installed outside of the USA or Canada:
AET warrants its solar control installed outside of the USA or Canada to be free from defects in material or workmanship, under
normal use and service for one year from date of the initial system installation, provided it is installed in accordance with the
EagleSun Systems - Operation and Installation Manual provided with the product. If written proof of the date of the initial
system installation is not provided to AET, the serial number, on the product, will be the sole determinant of the date of the initial
system installation.
If a product is defective, in workmanship or materials and is removed and returned freight prepaid within one (1) year after the
date of the initial system installation, AET will, at its option, either repair or replace the defective product and return it freight
prepaid. The costs incurred in removal and/or reinstallation of the product is NOT covered under this warranty.
Warranty exclusions:
1. Material supplied or workmanship performed by others in the process of installation
2. Damage resulting from improper installation or control of loads exceeding the product rating.
3. Problems resulting from failure to operate the products in accordance with recommended instructions contained in product’s
owners manual.
4. Problems resulting from tampering, accident, abuse, negligence, unauthorized repairs or alterations, fire, flood, lightning,
freezing, external water, voltage or current spikes and surges, war, or acts of God.
5. In the event of a defect, AET’s liability is strictly limited to the furnishing of repair or replacement part(s) as provided herein.
6. Damage to property or persons as a result of use of an improperly maintained heat transfer fluid, is not covered under this
warranty and shall not be the responsibility of AET.
THE EXPRESS LIMITED WARRANTY ABOVE CONSTITUTES THE ENTIRE WARRANTY OF ALTERNATE ENERGY
TECHNOLOGIES, LLC. WITH RESPECT TO ITS SOLAR CONTROL AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. IN NO EVENT SHALL ALTERNATE ENERGY TECHNOLOGIES, LLC. BE RESPONSIBLE FOR ANY
CONSEQUENTIAL, SPECIAL OR INCIDENTAL DAMAGES OF ANY NATURE WHATSOEVER.
NO WHOLESALER, AGENT, DEALER, CONTRACTOR, OR OTHER PERSON IS AUTHORIZED TO GIVE ANY
WARRANTY ON BEHALF OF ALTERNATE ENERGY TECHNOLOGIES, LLC. THIS WARRANTY IS VOID IF THE
PRODUCT HAS BEEN ALTERED IN ANY WAY AFTER LEAVING THE FACTORY.

09/12 - Page 9
APPENDIX
Temperature vs Resistance Conversion Chart for 10k Thermistors
°F
OHMS
°F
OHMS
°F
OHMS
°F
OHMS
°F
OHMS
°F
OHMS
°F
OHMS
-50
491,142
0
85,387
50
19,900
100
5,827
150
2,044
200
829
250
378
-49
472,642
1
82,719
51
19,377
101
5,697
151
2,005
201
815
251
373
-48
454,909
2
80,142
52
18,870
102
5,570
152
1,966
202
802
252
367
-47
437,907
3
77,656
53
18,377
103
5,446
153
1,929
203
788
253
362
-46
421,602
4
75,255
54
17,899
104
5,326
154
1,892
204
775
254
357
-45
405,965
5
72,937
55
17,435
105
5,208
155
1,856
205
763
255
352
-44
390,966
6
70,696
56
16,985
106
5,094
156
1,821
206
750
256
347
-43
376,577
7
68,535
57
16,548
107
4,982
157
1,787
207
738
257
342
-42
362,770
8
66,447
58
16,123
108
4,873
158
1,753
208
726
258
337
-41
349,522
9
64,428
59
15,711
109
4,767
159
1,720
209
714
259
332
-40
336,804
10
62,479
60
15,310
110
4,664
160
1,688
210
702
260
327
-39
324,597
11
60,595
61
14,921
111
4,563
161
1,657
211
691
261
323
-38
312,876
12
58,774
62
14,543
112
4,464
162
1,626
212
680
262
318
-37
301,622
13
57,014
63
14,173
113
4,368
163
1,596
213
669
263
314
-36
290,813
14
55,313
64
13,820
114
4,274
164
1,567
214
658
264
309
-35
280,433
15
53,669
65
13,473
115
4,183
165
1,538
215
648
265
305
-34
270,460
16
52,078
66
13,136
116
4,094
166
1,509
216
637
266
301
-33
260,878
17
50,541
67
12,809
117
4,007
167
1,482
217
627
267
296
-32
251,670
18
49,054
68
12,491
118
3,922
168
1,455
218
617
268
292
-31
242,821
19
47,616
69
12,182
119
3,839
169
1,428
219
607
269
288
-30
234,316
20
46,225
70
11,882
120
3,758
170
1,402
220
598
270
264
-29
226,138
21
44,879
71
11,589
121
3,679
171
1,377
221
588
271
280
-28
218,276
22
43,577
72
11,305
122
3,602
172
1,352
222
579
272
276
-27
210,716
23
42,318
73
11,029
123
3,527
173
1,328
223
570
273
273
-26
203,445
24
41,099
74
10,761
124
3,454
174
1,304
224
561
274
269
-25
196,451
25
39,919
75
10,500
125
3,382
175
1,281
225
553
275
265
-24
189,722
26
38,777
76
10,246
126
3,312
176
1,258
226
544
276
262
-23
183,248
27
37,671
77
9,999
127
3,244
177
1,235
227
536
277
258
-22
177,019
28
36,601
78
9,758
128
3,177
178
1,213
228
527
278
255
-21
171,023
29
35,565
79
9,525
129
3,112
179
1,192
229
519
279
251
-20
165,251
30
34,561
80
9,297
130
3,049
180
1,171
230
511
280
348
-19
159,696
31
33,590
81
9,076
131
2,987
181
1,150
231
503
281
244
-18
154,347
32
32,648
82
8,861
132
2,926
182
1,130
232
496
282
241
-17
149,197
33
31,737
83
8,651
133
2,867
183
1,110
233
488
283
238
-16
144,236
34
30,853
84
8,447
134
2,809
184
1,091
234
481
284
235
-15
139,458
35
29,998
85
8,249
135
2,752
185
1,072
235
473
285
232
-14
134,855
36
29,169
86
8,056
136
2,697
186
1,054
236
466
286
229
-13
130,420
37
28,365
87
7,867
137
2,643
187
1,035
237
459
287
225
-12
126,147
38
27,587
88
7,684
138
2,591
188
1,017
238
452
288
223
-11
122,030
39
26,832
89
7,506
139
2,539
189
1,000
239
445
289
220
-10
118,061
40
26,100
90
7,333
140
2,489
190
983
240
439
290
217
-9
114,235
41
25,391
91
7,164
141
2,440
191
966
241
432
291
214
-8
110,547
42
24,704
92
6,999
142
2,392
192
950
242
426
292
211
-7
106,991
43
24,037
93
6,839
143
2,345
193
933
243
420
293
208
-6
103,561
44
23,391
94
6,683
144
2,299
194
918
244
413
294
206
-5
100,254
45
22,764
95
6,530
145
2,254
195
902
245
407
295
203
-4
97,063
46
22,156
96
6,382
146
2,210
196
887
246
401
296
200
-3
93,986
47
21,566
97
6,236
147
2,167
197
872
247
395
297
198
-2
91,017
48
20,993
98
6,097
148
2,125
198
857
248
390
298
195
-1
88,152
49
20,438
99
5,960
149
2,084
199
843
249
384
299
193
300
190

09/12 - Page 10
Alternate Energy Technologies, LLC.
1345 Energy Cove Ct. · Green Cove Springs, FL 32043
PH: 800-874-2190 · FAX: [phone]
Web: www.aetsolar.com · Email: [e-mail]