DIFFERENTIAL TEMPERATURE CONTROLLER
DTC-10
FEATURES
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Solar powered hot water pumping system
The pump speed varies based on solar panel voltage
Three types of Differential control
Auto selects operation based on the which sensors are
connected to controller.
LEDs indicate operation / fault status
DESCRIPTION & OPERATION
The DTC-10 is a Differential Temperature Controller that
monitors up to four 10k ohm thermistor temperature sensors. It
turns on and off a Laing circulating pump based on the
differential temperature between T1 & T2 or T1 & T3 or T1 & T2
& T3 (see application notes on back). The DTC-10 and pump
are powered by a 30 watt solar panel. If any of the sensors short
or key sensors open the DTC-10 will turn on the pump.
SPECIFICATIONS
The DTC-10 is powered by the PV panel, when the sun
comes up in the morning the PV panel begins producing a
voltage, as that voltage rises to 4.0vdc DTC-10 wakes up, at
5.7vdc the DTC-10 begins monitoring the collectors temperature
sensors, when PV voltage reaches 6.7vdc it energizes the pump
relay turning off the solar voltage to pump. The Laing pump has
minimum run voltage of 8vdc, so up to this point the pump has
not run.
SIZE:
2.0"W x 3.30"L x 1.25"H
WEIGHT:
8 ounces
ENCLOSURE:
Epoxy potted in PVC plastic housing
MOUNTING:
Two #6 x 0.5" screws
POWER:
6.5 to 24V DC from PV panel
As the solar hot water collector begins storing the suns energy
the collector temperatures begin to increase. When the collector
outlet temperature is ten degrees greater that either the collector
inlet temperature or the tank temperature the DTC-10 turns on
the pump. When the outlet and inlet temperatures or outlet and
tank temperatures equalize the pump is turned off. This
prevents re-radiation of already collected energy.
CONNECTIONS:
1/4" standard push-on spades
RELAY CAPACITY:
10 Amps @28V DC (NC contact)
RELAY ACTION:
Normally closed, relay energizes to
stop pump.
TEMP. SENSORS:
10K Ohms Thermistors Qty 2-4
The DTC-10 will operate with T1 and T2 or T1 and T3
sensors, but hot water collection will be more efficient if all three
sensors are used. The DTC-10 powers down when the PV
panel no longer has sunlight to produce a voltage.
CURRENT DRAW:
Continuous < 10mA
Relay Activated < 30mA
DTC-10 KIT INFORMATION
DTC-SPK
DTC-DPK
- DTC-10 Single Pump Kit w/o PV panel
1 - DTC-10 controller
3 - AEI-10KPT sensors
1 - Laing 7X0B ½" pump
- DTC-10 Single Pump Kit w/o PV panel
1 - DTC-10 controller
3 - AEI-10KPT sensors
2 - Laing 7X0B ½" pump
LED INDICATION:
RED
GREEN
CONTROL:
Micro-processor based program,
re-programmable
COMMUNICATION:
Serial data on Ethernet jack,
Sensor temps, PV voltage and
pumping current
TEMPERATURE:
-30 to 758C
ORDERING INFORMATION
DTC-10
DTC-SPK-30 - DTC-10 Single Pump Kit w/ 30W PV panel
1 - DTC-10 controller
3 - AEI-10KPT sensors
1 - Laing 7X0B ½" pump
AEI-10K-PT - 10K Ohm Temperature sensor
Laing-720B - D5 ½" Bronze sweat Pump
AE-30WHE
- 30W 12VDC PV Panel
AE-50WHE
- 50W 12VDC PV Panel
ATKINSON ELECTRONICS, INC.
Web Site: www.atkinsonelectronics.com
- Differential Temperature Controller
Laing-710B - D5 ½" Bronze threaded (NPT) Pump
DTC-DPK-50 - DTC-10 Single Pump Kit w/50W PV panel
1 - DTC-10 controller
3 - AEI-10KPT sensors
2 - Laing 7X0B ½" pump
Power to pump
Blinks to indicate program operation
REV 12/09
Distributed by:
DIFFERENTIAL TEMPERATURE CONTROLLER
DTC-10
APPLICATION 1 - TWO COLLECTOR SENSORS
APPLICATION 2 - COLLECTOR & TANK SENSORS
The DTC-10 starts the pump when the solar outlet (T1) is 10'f or
greater than the solar inlet temperature (T2). The pump is
stopped when T1 & T2 temperature equalize. The DTC-10 is
mounted on the roof near the pump and the PV panel. The
temperature at the top of hot water tank may be warmer than the
collector and heat may be radiated back outside.
The DTC-10 starts the pump when the solar outlet (T1) is 10'f or
greater than the tank (T3) temperature. The pump is stopped
when T1 & T3 temperature equalize. The DTC-10 is mounted on
the roof near the pump and the PV panel.
APPLICATION 3 - THREE TEMP. SENSORS
APPLICATION 4 - TWO PUMP W/ HEAT EXCHANGER
The DTC-10 starts the pump when the solar outlet (T1) is 10'f or
greater than either the solar inlet (T2) or the tank (T3)
temperature. The pump is stopped when T1 & T3 temperature
equalize. Also the pump is stopped when the solar inlet
temperature (T2) is equal to the outlet temperature. This
application has the maximum energy collection.
Solar pump P1 runs whenever the PV panel is providing power.
The DTC-10 starts pump P2 to circulate the domestic water thru
the heat exchanger, whenever the solar loop (T1) is 10'f hotter
than the tank (T3). A 50W PV panel is required to operate the two
pumps.
ATKINSON ELECTRONICS, INC.
Web Site: www.atkinsonelectronics.com
REV 12/09
Distributed by:
DIFFERENTIAL TEMPERATURE CONTROLLER
DTC-10
OPERATION & ERROR CONDITIONS
ATKINSON ELECTRONICS, INC.
Web Site: www.atkinsonelectronics.com
REV 12/09
Distributed by: