Dwyer PLVT1 User Manual

<Up>

<Mode>

Fan

PLVT1 Digital Programmable Thermostat with Heat Pump

A. Installation, Mounting:

CAUTION:

1. Turn off Model PLVT1, electronic source and the electrical devices (e.g. heater) which will be connected before installation and maintenance.

2. The installer must be a trained service engineer.

120901

1. Installation Location:

The thermostat should be mounted on an inner wall 1.5m above the floor in position where it is readily affected by changes of the general room temperature with freely circulating air. Prevent direct exposure to sunlight; dripping or splashing area. Do not place this unit at a location where air circulation is low, or where it has great temperature changes (e.g. near door). Do not place the thermostat near heat generating sources (radiators, hot air vents, TV or lights).

2. Wiring:

For Model PLVT1, there are 6 wiring terminals at the back of the thermostat which

are labeled as “C”, “Y” and “G”, “Rc”, “R” and “O/W B”.

Different wirings are for different Mode types.

Mode type 1: Heat only with normal open or normal close valves

Mode type 2: Heat with fan

Mode type 3: Cool only

3. Mounting:

Mode type 4:Heat pump

1. Ensure the surface is level.

2. Place the cables at the hole near the terminal block.

3. Insert 2 pcs of wall anchors into the holes of the wall.

4. Fasten the thermostat with 2 pcs of long screws through the 2 mounting holes.

Mode type 5: Electric/oil/gas heat with cool

Use one transformer:

B. Start/Reset:

1. When the system is reset, all the LCD segments are ON and the measured temperature will be displayed after a while.

2. Low Battery Check will be done at startup. displays when battery is low.

3. Latch relay will be turned off at startup.

C. Normal Display Mode:

1. Temperature detection starts and LCD displays the room temperature.

2. In Heat or Auto mode, defrost function is activated with displayed

when temperature is below 5

°C / 40°

F. Heater is on regardless of the setting

temperatures.

3. Below 0

°C/

32°F, Model PLVT1 will display LO.

4. Above 40°C/ 99°F, Model PLVT1 will display HI.

Use two transformers:

key

> key

5. Press <Up>/ <Down> to adjust heat/ cool setting temperature.

6. Press <Mode> to select heat/ cool/ auto/ off mode.

7. Press <Fan> to select fan on/ auto.

key

<Down> key

D. Temperature Setting Display Mode:

Off

Down

ENT

> key

Down

ENT

To adjust heat/cool setting:

1. Press <Up> or <Down> keys to adjust heat/cool setting temperature in normal

display mode.

2. Heat/ Cool setting temperature flashes.

3. In Heat mode, only heat setting temperature can be adjusted.

4. In Cool mode, only cool setting temperature can be adjusted.

5. In Auto mode, heat and cool setting temperature can be adjusted.

6. In Off mode, no setting temperature can be adjusted.

7. Press <Mode> key to exchange the heat and cool setting temperature in auto mode.

8. The operation will resume to normal display mode after no key is pressed for 10’s.

E. Internal Mode Setting Display:

To adjust the internal setting of Model PLVT1:

Mode Type Selection

1. Press and hold <Mode> and <Up> keys for 2’s.

2. LCD changes to the display of Mode type selection.

Mode Type

3. The letters represent Mode type.

4. Press <Up>/ <Down> to adjust Mode type.

5. Press <ENT> to select Mode type and return to normal display mode.

Function Setting Selection

1. Press and hold <Fan> and <Down> keys for 2’s.

2. LCD changes to the display of Function setting selection.

Setting

Function type

3. The left letters represent Function type; the right letters represent Setting.

4. Press <Up>/ <Down> to adjust Function type/ Setting.

5. Press <NEXT> to select Function type/ Setting.

6. Press <ENT> to return to normal display mode.

> key

<NEXT> key

<Up> key

> key

Table of the Internal Setting:

Mode type Function type Setting

Heat only (normal-open

or normal-close valves)

HF Heat with fan

CL Cool

HP Heat pump

Electric/oil/gas heat with cool

(Default setting)

HS Span of Heater

dU Temperature Display Unit

Span of Heater

dU Temperature Display Unit

FC Fan Control method

dU Temperature Display Unit

CS Span of Cool

Compressor Minimum-

Delay

HS Span of Heater

CO Changeover Valve

dU Temperature Display Unit

CS Span of Cool

Compressor/ Heater

Minimum-Off Delay

SL Mode Adjustment

HS Span of Heater

dU Temperature Display Unit

CS Span of Cool

Compressor Minimum-Off

Delay

SL Mode Adjustment

FC Fan Control Method

1 °C / 2°F

2 °C/ 4°F

F 1 °C/ 2°F

2 °C/ 4°F

Gas or oil furnace – equipment

controls fan Electric furnace – thermostat

controls fan C

1°C/ 2°F

2°C/ 4°F 1 1 minute compressor off delay 2 2 minute compressor off delay 3 3 minute compressor off delay 4 4 minute compressor off delay 5 5 minute compressor off delay 1°C/ 2°F

2 °C/ 4°F

O/B terminal energized in cooling

(default)

H O/B terminal energized in heating

C F

1°C/ 2°F 2°C/ 4°F 1 1 minute compressor off delay 2 2 minute compressor off delay 3 3 minute compressor off delay 4 4 minute compressor off delay 5 5 minute compressor off delay 1 Heat, Cool Off Selectable 2 Auto, off Selectable 3 Heat, Cool Off, Auto Selectable 1°C/ 2°F (Default setting)

2 °C/ 4°F

C (Default setting)

1°C/ 2°F (Default setting)

2°C/ 4°F 1 1 minute compressor off delay 2 2 minute compressor off delay 3 3 minute compressor off delay

4 minute compressor off delay

(Default setting)

5 5 minute compressor off delay 1 Heat, Cool, Off Selectable 2 Auto, off Selectable

Heat, Cool Off, Auto Selectable

(Default setting)

Gas or oil furnace – equipment

controls fan

Electric furnace – thermostat

controls fan

(Default setting)

Description of the mode types:

1. Heat only ( normal-open or normal -close valves) Only Heat mode can be used for normal-open or normal -close valves, fan cannot be selected.

2. Heat with fan Only Heat mode can be used, fan can be selected.

3. Cool Only Cool mode can be used, fan can be selected.

4. Heat pump Heat/ Cool/ Auto mode can be selected with changeover valve. (**While in auto mode. There is a Heat/Cool switching delay of 4 minutes to switch a heating system to cooling system or vice versa. During the period either Heater/Cooler or Fan will not turn on.)

5. Electric/oil/gas heat with cool Heat/ Cool/ Auto mode can be selected. This is the default setting and common used in factories.

F. Replaceable Batteries Instruction:

Batteries shall be installed with proper polarity and correct battery type.

Do not use old and new batteries simultaneously.

Batteries shall be removed if consumed or if product is to be left unused for a long time. Use 1.5V/cell alkaline batteries 2 pieces.

G. Maintenance:

Caution: Switch off the electric source before maintenancing the thermostat. We recommend that the maintenance should be performed by trained personnel.

No heating/ cooling control:

- Check the thermistor sensor performance by measuring the corresponding variable resistance under different temperatures. If it is in good condition and the LCD value will change accordingly, then trace the control circuit or the LCD connection, otherwise replace it.

- If the control circuit has a problem, replace the PCB if necessary.

H. Specification:

1. Temperature measurement: 0°C~40°C / 32°F ~ 99°F

2. Accuracy: ±0.5°C/ 1°F

3. Temperature Controllable range:

Heat/Cool mode: Heat/Cool setting: 5°C~35°C / 40°F ~ 95°F

Auto mode: Heat setting: 5°C~30°C / 40°F ~ 85°F Cool setting: 10°C~35°C / 50°F ~ 95°F

4. Resolution: 0.5°C /1°F

5. Power Supply: 24V~ +/-10% or 2 x AAA alkaline batteries

6. Rating: 24V~ 50/ 60Hz 1A max

7. Terminals: 2mm2 cable

8. Operating temperature: 0 – 50 °C / 32 – 122 °F

9. Storage temperature:

10. Sensing Element: NTC thermistor

-5 – 50 °C/ 23 – 122 °F