Full Gauge Controls MT-526C Manual

1- DESCRIPTION

MT-526C
The becomes automatic the heat pump operation, enabling temperature control adjustments in
thermal reservoirs and pools for greater user comfort.
This instrument provides greater security to the equipment due to its digital inputs, which allow disarming the
system through high / low pressure controls and flow or temperature (depending on the adopted operation
mode). The heat pump operation can be configured to drive the full predetermined time after SCAN.

2 - APPLICATION

Heat pumps.

3 - TECHNICAL SPECIFICATIONS

- Direct power supply with internal transformer: 127 or 220Vac (50/60Hz)
- Control temperature: -50 to 105°C (resolution 0.1°C)
-58 to 221°F (resolution 1°F)
- Operating temperature: 0 to 50 °C
- Operating humidity: 10 to 90% RH (without condensation)
- Inputs:
Three temperature sensors:- S1: temperature in the heat pump's input
- S2: temperature in the evaporator
- S3: temperature in the heat pump's outlet *
* You must configure the operating mode of this input for it to operate as a temperature sensor.
See configuration table. This sensor is sold separately!
Three digital inputs: - LOW: low pressure switch
- HI: high pressure switch
- FLOW: flow switch**
** This input operates normally as a digital input for the flow switch. You must configure the operating mode of
this input for it to operate as a temperature sensor. See configuration table. This sensor is sold separately!
- Outputs:
Three relay outputs: - POOL: compressor actuation
- PUMP: Circulation pump
- FAN: Fan actuation
-Contact type: Normally open
-Maximum current: 5 A per output (resistive load)
- Dimensions: Diameter 60 mm, depth 40 mm

4.1 - To enter the function menu

- Simultaneously press buttons and for two seconds until [Fun] shows on the display.
When releasing the buttons, the message [F01] will be shown.
Press again (short press).
- Use buttons and to enter the access code (123) and when done, press
- Use buttons and to access the desired function.
- After selecting the function, press (short press) to display the set value.
- Use buttons and to change the value, and when done, press
return to the function menu.
- To exit the menu and return to normal operation, press

4.2 - Parameters table

Fun Description
[F01]
Access code (123)
[F02]
Control differential (hysteresis)
[F03]
Minimum setpoint allowed to the end user
[F04]
Maximum setpoint allowed to the end user
[F05]
Delay time for starting compressor (delay)
[F06]
Temperature for starting defrost (***)
[F07]
Differential for completing defrost (***)
[F08]
Link the defrosting process to alarms
[F09]
Operating mode of input 3
[F10]
Delay time for the first scan
[F11]
Scanning time
[F12]
Time between scans
[F13]
Flow switch validation time
[F14]
Linking flow switch to alerts
[F15]
Automatic reset mode
[F16]
Delay time for resets
[F17]
Minimum temp. differential (S1-S3) (****)
[F18]
Maximum temp. differential (S1-S3) (****)
[F19]
Intensity of the digital filter
[F20]
Offset indication of sensor 1 (offset 1)
[F21]
Offset indication of sensor 2 (offset 2)
[f22]
Offset indication of sensor 3 (offset 3) (*****)
MT-526C
TEMPERATURE CONTROLLER
FOR HEAT PUMPS
V.03
.
to record the configured value and
(long press) until [---] appears.
CELSIUS FAHRENHEIT
Max Unid Standard Max Unid Standard
Min Min
- - - - - -
-
0.1 °C 1.5 1 36 °F
20.0
°C °F
-50.0 105.0 14.0 -58 221
°C °F
-50.0 105.0 40.0 -58 221
0 999 Sec 30 0 999 Sec
-15.0 30.0 °C -8.0 5 50 °F
0.1 °C 13.0 1 36 °F
20.0
0 - 0 0 1 -
1
0 - 0 0 1 -
1
0 Min 20 0 999 Min
999
Min Min
0 999 3 0 999
Min Min
0 999 60 0 999
Sec Sec
0 999 120 0 999
0 1 - 1 0 1 -
0 - 0 0 10 -
10
1 Min 60 1 999 Min
999
0.1 °C 2.0 1 54 °F
30.0
0.1 °C 10.0 1 54 °F
30.0
- -
0 9 0 0 9
°C °F
-20 20 0.0 -36 36
°C °F
-20 20 0.0 -36 36
-20 20 °C 0.0 -36 36 °F

4.3 - Description of parameters

[F01]- Access code
When entering the access code (123), the controller allows the user to change the values ​​of the other
parameters.
[F02]- Control differential (hysteresis)
Determines the temperature when the compressor turns on and off. If temperature S1 is below the "Control
temperature" minus "Control differential", the compressor is turned on. When the temperature is above the
"Control temperature" the compressor is turned off.
[F03]- Minimum setpoint allowed to the end user
Prevents the user to configure the "Temperature Control" with values too low.
[F04] - Maximum setpoint allowed to the end user
Prevents the user to configure the "temperature control" with values too high.
[F05]- Delay time for starting compressor (delay)
Whenever it is necessary to turn on the compressor, MT-526C will first turn on the fan. The controller waits
this amount of time set in this function before turning on the compressor.
[F06]- Temperature for starting defrost (***)
When temperature S2 is below the value set in this function, the controller starts the defrost cycle .
[F07]- Differential for completing defrost (***)
When the temperature S2 is above "Temperature for starting defrost" plus "Differential for completing defrost",
the controller finalizes the defrost cycle.
[F08]- Link the defrosting process to alarms
Allows to link defrosting process to the other alarms.
[,0,]- No
The defrosting process does not generate alarms.
[,1,]- Yes
The defrosting process generates an alarm and the controller will indicate the message [dEF]. For this
configuration, the MT-526C enable automatic resets depending on the value set in "Automatic reset
mode". The reset attempts to defrosting process will be added to the reset attempts of other alarms. The reset
process will occur after the "Delay time for reset" and only if the defrosting process has been finalized.
[F09]- Operating mode of input 3
Allows you to configure the operating mode of input 3.
[,0,]- Digital input (flow switch)
When configured as a digital input, it will have the function of monitoring the flow switch. In this way you can
see if the pump is on and if there is circulation between the heat pump and reservoir (SPA or pool).
[,1,]- Input of the temperature sensor 3
When configured as input to the sensor 3, MT-526C starts to monitor the heat flow between the heat pump
and the reservoir using the temperature difference between sensors 1 and 3.
[F10]- Delay time for the first scan
When the instrument is turned on, the first temperature scan will be performed after the time set in this
parameter.
[F11]- Scanning time
This parameter lets you adjust the operating time of the circulation pump and reservoir temperature scan.
During this process, the circulation of water between the heat pump and the reservoir determines the need to
turn on the compressor or not.
[F12]- Time between scans
-
This parameter lets you adjust the time between two temperature scans.
3
[F13]- Time to validate the flow switch
58
The lack of flow can be detected through the FLOW digital input (if F09 = 0) or using the third temperature
104
sensor S3 (if F09 = 1). For any of these detection forms of flow fault, validation occurs only after counting of the
30 programmed time set in this parameter.
The start of this time counting occurs every attempt to drive the pump (PUMP output) if F09 = 0. If F09 = 1, the
17
counting starts after start of the compressor (output POOL).
24
If the end of validation time a lack of flow is detected, the alarm [FLo] is activated. This validation time refers
0
only to the flow switch, the validation of the digital inputs linked with pressure switches occur instantly. This
0
feature prevents false triggering of lack of flow alarms. For any alarm ([PLo], [PHi] or [Flo]) all outputs
will be turned off.
20
3
[F14]- Linking flow switch to alerts
60
Enables linking the flow switch to other alerts.
120 [,0,] - No
The flow switch does not generate alert.
1
[,1,] - Yes
0
The flow switch generates an alert and the controller will indicate the message [Flo]. For this setting, the,
60
MT-526C will enable automatic resets depending on the value set to "automatic reset mode." Reset
4
attempts to the flow switch will be added to the reset attempts of other alerts. The reset for the flow switch will
18 occur after the "Delay Time to reset".
0
[F15]- Automatic reset mode
0
Allows you to configure the maximum number of automatic resets. If is detects any alarm ([Flo], [Plo],
0
[Phi]or[dEF]) the controller will attempt to reset after the time set in "Delay time for automatic resets". To
0 defrost alarms, beyond this delay time, the reset will occur only after the end of the defrosting process.