Specifications

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Fan Coil Thermostat Controller

Specification and Installation Instructions

TFHB24F3XYZ2-EBA-140113.docx

Model

TFHB24F3XYZ2

with Humidity Sensor and BACnet Communication

Description

The TFHB24F3XYZ2 is a fully configurable controller designed

specifically for 2 pipe and 4 pipe fan coil applications. No

additional modules are required as the required inputs, outputs

and control algorithms are built into the unit. The

TFHB24F3XYZ2 also provides support for networked

communications via the BACnet MS/TP protocol. The

TFHB24F3XYZ2 also provides an internal humidity sensor to

dehumidify the controlled space when the humidity is too high

by cooling with the fan on low to create condensate.

TFHB24F3XYZ2

Applications

• Heating, cooling and reheat

• 2 pipes or 4 pipes

• Auxiliary heating sources, such as electric baseboards, can

also be applied

Features

• Backlit LCD with simple icon and text driven menus

• Configurable inputs and outputs

• 2 Pipes with Analog, ON/OFF, or Floating option

• 4 Pipes with Analog, ON/OFF, or Pulse option

• Internal humidity sensor and dehumidification sequence

(compensated by auto activation of reheat output)

• Precise temperature control with programmable PI function

• Selectable Fahrenheit or Celsius scale

• Independent cool and heat setpoint for No Occupancy

• Lockable setpoint, control mode, and fan mode

• Selectable internal or external temperature sensor

• Changeover by contact or external temperature sensor

• Selectable proportional control band and dead band

• Anti-freeze protection

• BACnet® MS/TP @ 9600, 19200, 38400, or 76800 bps

o Selectable MAC address

o Automatic or manual device instance assignment

o Automatic baud rate detection

o Copy and broadcast configuration to other

networked TFHB24F3XYZ2 modules

Typical Application

Fan coil applications provide heating and cooling to a zone by

circulating hot and cold air depending on the demand to maintain

an optimum temperature in the selected space. A fan coil setup

typically consists of fan coil units, source for hot and cold water,

and a pipe system for distribution. When there is a demand for

heating, the hot water is supplied to the unit through the source

and passes over the heating coil, and the hot air is pushed into

the zone by the fan. When there is a demand for cooling, the cold

water is supplied to the unit through the source and passes over

the cooling coil, and the cold air is pushed into the zone by the

fan.

* Consult www.neptronic.com for details on these Neptronic products.

Technical Specifications

Description

Fan Coil Thermostat Controller

Inputs

1 Digital input (24Vac or dry contact)

1 Analog input (external temperature sensor 10Kohms)

1 Analog input (change over 10Kohms or dry contact)

Outputs 1 Fan analog or 3 Fan speed dry contracts 24Vac, 1A max 3A in-rush)

2 Analog outputs (cooling and/or heating 0-10Vdc

1 Analog output (local reheat 0-10Vdc)

2 TRIAC outputs (cooling and/or heating) 24Vac, 0.3A max fused / TRIAC

1 TRIAC output (local reheat) 24Vac, 0.3 max fused TRIAC

Power supply

22 to 26Vac 50/60Hz

Power consumption

1VA max

Setpoint range

10ºC to 40ºC [50ºF to 104ºF], Humidity 10 to 65% RH

External sensor range

0ºC to 50ºC [32ºF to 122ºF]

Control accuracy

Temperature: ±0.4ºC [0.8ºF], Humidity: ±3.5%

Proportional band

0.5ºC to 5ºC [1ºF to 10ºF] adjustable (heat/cool/reheat independent)

Dead Band

0ºC to 5ºC [0ºF to 10ºF] adjustable (heat/cool/reheat independent)

Electrical connection

0.8 mm

[18 AWG] minimum

Summary of content (16 pages)

PAGE 1
Fan Coil Thermostat Controller Specification and Installation Instructions Model TFHB24F3XYZ2 with Humidity Sensor and BACnet Communication Description The TFHB24F3XYZ2 is a fully configurable controller designed specifically for 2 pipe and 4 pipe fan coil applications. No additional modules are required as the required inputs, outputs and control algorithms are built into the unit. The TFHB24F3XYZ2 also provides support for networked communications via the BACnet MS/TP protocol.
PAGE 2
Fan Coil Thermostat Controller Specification and Installation Instructions Description Fan Coil Thermostat Controller Operating temperature 0ºC to 50ºC [32ºF to 122ºF] Storage temperature -30ºC to 50ºC [-22ºF to 122ºF] Relative Humidity 5 to 95% RH non condensing Degree of protection of housing IP 30 (EN 60529) Weight 160 g. [0.36 lb] Dimensions A = 2.85” | 73mm B = 4.85” | 123mm C = 1.00” | 24mm D = 2.36” | 60mm E = 3.
PAGE 3
Fan Coil Thermostat Controller Specification and Installation Instructions Wiring - 4 Pipe Terminal Description Details - 4 Pipe For 4 pipe signal configuration, refer to step 15 and 18 on page 6. For fan output configuration, refer to step 33 on page 8. Terminals Cool: Analog Heat: Analog Cool: On/Off Heat: On/Off Cool: Analog Heat: On/Off or Pulse Cool: On/Off Heat: Analog Step 1 Common Common Common Common Common - 2 24 Vac 24 Vac 24 Vac 24 Vac 24 Vac - 3 TRIAC Input Voltage (ext.
PAGE 4
Fan Coil Thermostat Controller Specification and Installation Instructions Programming Mode The Mode Selector Jumper JP3 must be set to the “PGM” mode (Programming Mode). Refer to Wiring on page 2. To exit, set the Jumper JP3 back to the “RUN” mode (Operation Mode). All changes will be saved. Setpoint and User Control 1. “inside temper sensor offset” Range: Offset Increment: 10.0 to 40.0ºC Max. ± 5ºC 0.1ºC [50.0 to 104.0ºF] [0.
PAGE 5
Fan Coil Thermostat Controller Specification and Installation Instructions 6. “adjust temper control mode” Default: Range: Auto (Automatic) Auto (automatic cooling and heating), ON (Cooling or Heating), Heat (Heating Only), Cool (Cooling Only) Select the control mode that you want to authorize to the user. To authorize all the available modes, select Auto (Automatic Mode). The cooling and heating symbols are also displayed. 7.
PAGE 6
Fan Coil Thermostat Controller Specification and Installation Instructions 13. “Ch over temper sensor” Default: Range: SENs (external changeover sensor) SENs, NoCl, NoHt • If SENs is selected: heating mode activates when the temperature read by the external sensor is above the Changeover Setpoint and cooling mode activates when the temperature read by the external sensor is below the Changeover Setpoint.
PAGE 7
Fan Coil Thermostat Controller Specification and Installation Instructions 20. “max vdc analog output cooling ” Default: Range: Increment: 10.0 Volt 0.0 to 10.0 Volt 0.1 Volt Select the desired maximum voltage (span value) for cooling ramp. The maximum value (Step 20) is restricted by the minimum value (Step 19). In other words, the maximum value should be greater than the minimum value. 21.
PAGE 8
Fan Coil Thermostat Controller Specification and Installation Instructions 27. “control ramp cooling” Default: Range: Increment: 2.0ºC 0.5 to 5.0ºC 0.5ºC [4ºF] [1 to 10ºF] [1ºF] Select the desired value for the cooling proportional band. The cooling symbol is also displayed. 28. “control dead band heating” Default: Range: Increment: 0.3ºC 0 to 5.0ºC 0.1ºC [0.6ºF] [0 to 10.0ºF] [0.2ºF] Select the desired value for the heating dead band. The heating symbol is also displayed. 29.
PAGE 9
Fan Coil Thermostat Controller Specification and Installation Instructions 36. “enable fan auto mode” Default: Range: Yes (enabled) Yes (enable), No (disable) Select the Enable or Disable option to allow the user to adjust the Automatic mode. The fan symbol is also displayed. If you selected No (disable), go to Step 38. 37. “fan auto timeout minutes” Default: Range: Increment: 2 minutes 0 to 15 minutes 1 minute Select the desired value for the automatic shutoff delay.
PAGE 10
Fan Coil Thermostat Controller Specification and Installation Instructions Humidity Settings 44. “inside humidity sensor offset” Offset: Range: Increment: ± 5% 10 to 90% 0.1%RH Compare the displayed humidity percentage reading with a known value from a humidistat. This is useful for humidistats installed in areas where the humidity read is slightly different than the rooms's actual humidity. For example, a humidistat placed right under the air diffuser. The humidify symbol is also displayed. 45.
PAGE 11
Fan Coil Thermostat Controller Specification and Installation Instructions 52. “Select begin address” Default: Range: Increment: 0 0-254 1 Select the first address you want to copy to. For example, if you select MAC address 1 as the begin address and 54 as the end address, all the devices from 1 to 54 will receive the configuration of the current device. 53. “Select end address” Default: Range: Increment: "begin address" "begin address + 63" 1 Select the last address you want to copy to.
PAGE 12
Fan Coil Thermostat Controller Specification and Installation Instructions BACnet Setup Operation Mode The BACnet Setup mode is accessible through the normal Operation mode. 1. The Mode Selector Jumper (JP3) must be set to the “RUN” mode (Operation Mode). Refer to Wiring on page 2. 2. Press the and keys for 5 seconds. The “Enter Password” screen appears. 3. Enter the password (637) within 1 minute.
PAGE 13
Fan Coil Thermostat Controller Specification and Installation Instructions Operation Mode The Mode Selector Jumper (JP3) must be set to the "RUN" mode (Operation Mode). Refer to Wiring on page 2. To exit, set the Jumper (JP3) back to the "PGM" mode (Programming Mode). All changes will be saved. Power Up Upon power up, the LCD illuminates and all segments appear for 2 seconds. The thermostat then displays its current version for 2 secs.
PAGE 14
Fan Coil Thermostat Controller Specification and Installation Instructions Control Mode To access the Control Mode, press the key. The Control Mode appears for 5 seconds. These options can vary depending on the options selected at Steps 6 and 7 on page 5. • Auto (Automatic Cooling or Heating) • Cooling only (on) • Heating only (on) • OFF Fan Speed Selection Mode To access the Fan Speed selection mode, press the key. The mode appears for 5 seconds.
PAGE 15
Notes Recycling at end of life: please return this product to your Neptronic local distributor for recycling. If you need to find the nearest Neptronic authorized distributor, please consult www.neptronic.com.
PAGE 16
400 Lebeau blvd, Montreal, Qc, H4N 1R6, Canada www.neptronic.com Toll free in North America: 1-800-361-2308 Tel.