Installation guide

ManualsBrandsVykon ManualsConsumer electronicsVT76X7

PIR Ready VT76X7 Series

Programmable & Non-Programmable Thermostats

With Humidification & Dehumidification Strategy

For Commercial HVAC Applications

September 1, 2010

Product overview

The VT76x7 PI thermostat family is specifically designed for single stage

and multi-stage control of heating/cooling equipment such as rooftop and

self-contained units with humidifier and/or dehumidifier. The product

features an embedded complete humidity solution with an intuitive, menu-

driven, backlit LCD display that walks users through the programming

steps, making the process extremely simple. Accurate temperature &

relative humidity control is achieved due to the product’s PI time

proportional control algorithm, which virtually eliminates temperature offset

associated with traditional, differential-based thermostats.

All models contain one digital input, which can be set by the user to

monitor filter status, activate a remote temporary occupancy switch, and/or used as a general purpose service

indicator. The two models contain a SPST auxiliary switch, which can be used to control lighting or disable the

economizer function and a discharge air sensor input.

The thermostats are also compatible with the new Vykon PIR cover accessories. Thermostats equipped with

a PIR cover provide advanced active occupancy logic, which will automatically switch occupancy levels from

Occupied to Stand-By and Unoccupied as required by local activity being present or not. This advanced

occupancy functionality provides advantageous energy savings during occupied hours without sacrificing

occupant comfort. All thermostats can be ordered with or without a factory installed PIR cover ( see ordering

notes below ).

The additional following documentation is available:

• VYKONStat PIR Ready VT76xx Series BACnet Integration Guide

• VYKONStat PIR Ready VT6x7 Series LonWorks Integration Guide

• VYKONStat PIR Application Guide

• VYKONStat PIR Cover Assembly Installation Guide

• VYKONStat Wireless Controller Application Guide

Models Available

Application 2 Heat / 2 Cool

Model (programmable) VT7657B5x28(X)

Model (non-programmable) VT7607B5x28(X)

Ordering Information Notes:

- (X) model number represents available communication options: X=none for Stand-alone, X=B for BACnet MS-TP, X=E for Echelon and X=W for

Wireless

- Thermostats can be ordered with a factory installed PIR cover. Please use (5500) extension instead of the (5028) only extension.: Ex. VT7607B5500E.

- Thermostats ordered without a PIR cover can be retrofitted with a separate PIR accessory cover afterwards when required

Features and benefits

Features Benefits

• Advanced occupancy functions ⇒ Through the network or smart local occupancy sensing

• Ready for PIR accessory cover ⇒ Fully integrated advanced occupancy functionality with

a PIR accessory cover

• Embedded humidification sequence (0-10 Vdc output)

and dehumidification sequence (dry contact)

⇒ Simplifies installation and reduce installation costs

• Internal embedded RH sensor ⇒ Eliminates components

• Proportional RH high limit override ⇒ Prevents costly damage due to over-humidification

• Humidity setpoint reset based on outdoor temperature ⇒ Saves energy and prevents window condensation in

colder climates

• PI time proportioning algorithm ⇒ Increased comfort , accuracy, and energy savings

• 1 digital input ⇒ Adds functionality

• Smart fan ⇒ Saves energy during night mode

• Unique configuration key with password protection ⇒ Minimizes parameter tampering

• 6 hour reserve time for clock ⇒ No need to re

ram da

/time after

ower shorta

• Remote outdoor tem

erature senso

⇒ Increase flexibilit

and functionalit

• Auxiliar

out

ut ⇒ Can be used for li

htin

and/or economizer override

• Discharge air humidity sensor ( 0-10 Vdc input ) ⇒ Can be used to limit supply RH levels

• Intuitive, menu-driven programming (7 day, 2/4 events -

on programmable models only)

⇒ Can be used for all types of establishments

Summary of content (25 pages)

PAGE 1
PIR Ready VT76X7 Series Programmable & Non-Programmable Thermostats With Humidification & Dehumidification Strategy For Commercial HVAC Applications September 1, 2010 Product overview The VT76x7 PI thermostat family is specifically designed for single stage and multi-stage control of heating/cooling equipment such as rooftop and self-contained units with humidifier and/or dehumidifier.
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PAGE 3
Theory of operation The VT76x7 uses a Viconics proprietary adaptive logic algorithm to control the space temperature. This algorithm controls the heating / air conditioning system to minimize overshoots while still providing comfort. It provides exceptional accuracy due to its unique PI time proportioning control algorithm, which virtually eliminates temperature offset associated with traditional, differential-based on/off thermostats. Fig.2 - On/Off mechanical control vs PI electronic control.
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Installation • • • • Remove security screw on the bottom of thermostat cover. Open up by pulling on the bottom side of thermostat. Remove Assembly and wiring terminals from sticker. (Fig. 3) Please note the FCC ID and IC label installed in the cover upon removal of cover for the wireless products. A) 12345- Location: Should not be installed on an outside wall. Must be installed away from any heat source. Should not be installed near an air discharge grill.
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Wiring identification & screw terminal arrangement Part Number Programmable VT7657B5x28(X) Yes VT7607B5x28(X) No Top left terminal block Y2 Y1 G RC C X X X X X X X X X X Y2 Y1 G RC C RH W1 W2 8 pole bottom connector Top right terminal block RH W1 W2 3 pole left top connector 5 pole left top connector X X X X X X DE HUM AUX HUM DI HS S COM OS HL Bottom terminal block HUM AUX DEHUM DI HS SCOM OS HL X X X X X X X X X X X X X X X X Detailed wiring diagrams for selected models VT76X7B
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Wiring notes: Note 1: If the same power source is used for the heating stages, install jumper across RC & RH. Maximum current is 2.0 amps. Note 2: If auxiliary output is used to toggle occupancy of the electronic control card inside the equipment, configure the relay parameter (Aux cont ) to the N.O. setting. A second relay can be added for additional functionality of the occupancy output. Note 3: Humidifier output uses a half bridge rectifier.
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User menu flow chart: NOTE: Prompts may not all be present depending on model selected MENU T e mp e r a t s e t ? Y/ N If status is: Unoccupied Ov e r r i d e s c h d Y/ N If status is: Temporary Occupied Time, Occupied hold or Unoccupied hold Re s u me s c h d Y/ N Hu mi d i t y s e t ? Y/ N S y s mo d e s e t ? Y/ N Off Heat Cool Auto F a n mo d e s e t ? Y/ N On stand-alone models only Sc h e d ul e s e t ? Y/ N Cl o c k s e t ? Y/ N On Smart Auto Hu mi d i f i s e t ? Y/ N RH% RH% Ex
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Programming and status display instructions 1. Status display The thermostat features a two-line, eight-character display. There is a low-level backlit level that is always active and can only be seen at night. When left unattended, the thermostat has an auto scrolling display that shows the actual status of the system. Each item is scrolled one by one with the backlighting off. Pressing any key will cause the backlit to come on. Sequence of auto-scroll status display: Room Temp & Humidity x.
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2. User programming instructions menu The VT7600 series of thermostat feature an intuitive, menu-driven, backlit LCD display that walks users through the programming steps, making the programming process extremely simple. This menu is typically accessed by the user to set the parameters such as temperature and time events, system mode, fan mode, etc. It is possible to bring up the user menu at any time by depressing the MENU key.
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A) Override an unoccupied period Override schd Y/N This menu will appear only when the thermostat is in unoccupied mode. The unoccupied mode is enabled either by the internal timer scheduling or by a remote NSB contact via DI. If DI is configured to operate as a remote temporary override contact, this menu will be disabled. Answering yes to this prompt will cause the thermostat to go into occupied mode for an amount of time equal to the parameter “TOccTime” (1 to 12 hours).
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Dehumidification process If (Dhu LCK) Dehumidification Lockout Functions is set to On (Enabled): Dehumidification process will only be allowed when the thermostat is in cooling mode (System Mode = Cool or System Mode = Auto and effective mode at the thermostat is cool). If there is a dehumidification demand and the fan is OFF, the fan is first turned ON and the dehumidification output is then activated.
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G) Schedule set (2 events) Scheduling can have 2 or 4 events per day. This is set in the configuration menu as per parameter (2/4event ) Schedule set Y/N This section of the menu permits the user to set the whether 2 or 4 events is needed. Each day can be tailored to specific schedules if needed. • 2 events can be programmed per day. • Occupied & unoccupied periods can be set for each day.
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H) Schedule set (4 events) Schedule set Y/N This section of the menu permits the user to set the whether 2 or 4 events is needed. Each day can be tailored to specific schedules if needed. • 4 events can be programmed per day. • Occupied & Unoccupied periods can be set for each day. • Programming the 3 rd. & 4 th. events to the same time will cancel the last period.
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I) Clock/Day Settings Clock set Y/N This section of the menu permits the user to set the time and day. Time setting Time set? Y/N Time 0:00 No next → Yes down ↓ Use ▲▼ To set value Day setting Day set? Y/N Day Monday No next → Yes down ↓ Use ▲▼ To set value Time format setting 12/24hrs set? Y/N 12/24hrs 12 hrs No = exit Yes down ↓ Use ▲▼ To set value J) Schedule hold Schedule hold Y/N This menu • • • • • This menu will only appear on stand-alone thermostat, e.i.
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Installer configuration parameter menu - Configuration can be done through the network or locally at the thermostat. - To enter configuration, press and hold the middle button “Menu” for 8 seconds - If a password lockout is active, “Password” is prompted. Enter password value using the “up” and “down” arrows and press “Yes” to gain access to all configuration properties of the thermostat. A wrong password entered will prevent local access to the configuration menu.
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Channel Channel selection Conditional parameter to Wireless models (VT76xxX5x28W) Default value = 10 This parameter will only appear when a wireless network adapter is present. If the thermostat is installed as a standalone unit or with a BACnet or Echelon adapter, this parameter will not be used or displayed Range is: 10 to 26 This parameter (Channel) is used to link specific thermostats to a specific Vykon JACE with wireless network adapter.
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Lockout Keypad lockout levels 0 = No lock 1 = Low level 2 = High level Default value = 0 No lock Level 0 1 2 Pwr del Resume/ Override scheduling Permanent Temporary Occupied and setpoints Unoccupied using arrows Setpoints Humidity Setpoints System mode setting Fan mode setting Schedules setting Clock setting Permanent hold Resume sched Y/N Temperat set Y/N Up key (▲) Down key (▼) Humidity set Y/N Sys mode set Y/N Fan mode set Y/N Schedule set Y/N Clock set Y/N Schedule hold Y/N Yes
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Heat cph Cool cph Deadband Fan cont Fan del TOccTime Cal RS Cal OS H stage Will set the maximum number of heating stage cycles per hour under normal control operation. It represents the maximum number of cycles that the equipment will turn ON and OFF in one hour. Note that a higher C.P.H will represent a higher accuracy of control at the expense of wearing mechanical components faster. 3, 4, 5, 6,7 & 8 C.P.H.
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C stage Number of cooling stages 2 stages model only Default value = 2 stages Will revert the operation of 2 stage thermostat to single stage operation only when the second cooling step is not needed. 1 or 2 stages H lock Outside air temperature heating lockout Default value = 120 °F ( 49 °C ) C lock Outside air temperature mechanical cooling lockout. Default value = -40 °F ( -40 °C ) Disables heating stage operation based on outdoor air temperature.
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Prog rec Progressive recovery enabled Default value = Off Progressive recovery is automatically disabled if DI is configured as Remote NSB For scheduling model only VT7657B1028B Off, = no progressive recovery The programmed occupied schedule time is the time at which the system will restart. On, = progressive recovery active. The programmed occupied schedule time is the time at which the desired occupied temperature will be attained. The thermostat will automatically optimize the equipment start time.
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RE Sp Reset humidity setpoint Default value = 20% RH The RH setpoint will be reset from the user setpoint to this value when the RH LT outside air temperature value is reached. Only valid if an outdoor air sensor is connected at the thermostat or a network value is transmitted to the thermostat. See RH LT & RE HT. From 10% RH up to 90% RH RH cal Humidity sensor calibration Offset that can be added/subtracted to actual displayed humidity by ± 15.0 %RH.
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Humidity setpoint reset by outside air temperature 45% If an outdoor air sensor is connected at the thermostat or a value is received from the network, it can be used to reset the humidity setpoint during the cold season to minimize condensation on windows and building structures. RH Set = 45% %RH Setpoint 40% RH HT = 32°F 35% When the outdoor temperature falls below the selected high temperature, parameter RH HT (32°F in the example Figure 8), the humidity setpoint will start to decrease.
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Troubleshooting guide Symptom No display on the thermostat Possible Cause Absent or incorrect supply voltage Overloaded power transformer Corrective Action 1. Check power supply voltage between C & RC to be from 19-30 Vac 2.
PAGE 24
Symptom Thermostat will not call for cooling Possible Cause Wrong mode selected Thermostat in Unoccupied mode Anticycle delay active Cooling setpoint is satisfied Cooling lockout attained Wiring error Corrective Action Select cooling mode Select Occupied Hold in Schedule hold or Override to force the thermostat Occupied cooling setpoint Wait, the anticycling period will end and the equipment will start Lower the cooling setpoint 1. Mode is locked out based on outside air temperature 2.
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Specifications Thermostat power requirements: 19-30 Vac 50 or 60 Hz; 2 VA ( RC & C ) Class 2 RC to RH jumper 2.0 Amps 48 VA maximum Operating conditions: 0 °C to 50 °C ( 32 °F to 122 °F ) 0% to 95% R.H. non-condensing Storage conditions: -30 °C to 50 °C ( -22 °F to 122 °F ) 0% to 95% R.H. non-condensing Temperature sensor: Local 10 K NTC thermistor Resolution: Temperature: ± 0.1 °C (± 0.2 °F) Humidity: ± 0.1% Control accuracy: Temp: ± 0.5 ° C ( ± 0.9 °F ) @ 21 °C ( 70 °F ) typ.