Fan Coil Controller – EZstat www.Engineered-Comfort.com Date: 9-2014 Supersedes: NEW Page 1 of 36 Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
Installation and Operation Manual ● Fan Coil Controller – EZstat CONTENTS 1 P REFACE.....................................................................................................................................3 2 SAFETY SYMBOLS & CONSIDERATIONS....................................................................................3 3 I NTRODUCTION.........................................................................................................................3 3.1 FEATURES.............
Installation and Operation Manual ● Fan Coil Controller – EZstat 1 PREFACE Your equipment is initially protected under the manufacturer’s standard warranty. However, this warranty is provided under the condition that the steps outlined in this manual are followed for initial inspection, proper installation, periodic maintenance and everyday operation of the equipment. This manual should be fully reviewed in advance of any actual work being done on the equipment.
Installation and Operation Manual ● Fan Coil Controller – EZstat 3.3 Specifications EZstat specifications are subject to change without notice. User Interface The user interface is a color display and with five push buttons. Through the menu driven display, an operator can do the following: • Add or change user passwords • Change setpoints • Set BACnet addressing • Set up and commission the installation • Configure any available options Security Separate passwords for users and controls technicians.
Installation and Operation Manual ● Fan Coil Controller – EZstat Accuracy Type ±0.36° F (±0.2° C) Accuracy ±0.36° F (±0.2° C) Resistance Operating Range 10,000 Ω at 77° F (25° C) 48 to 96° F (8.8 to 35.
Installation and Operation Manual ● Fan Coil Controller – EZstat 3.4 EZstat Features Up and Down Buttons Soft Key Bar Soft Key Buttons Supersedes: NEW Inputs and Network Power and Outputs Date: 9-2014 Page 6 of 36 Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
Installation and Operation Manual ● Fan Coil Controller – EZstat 4 INSTALLATION This section provides important instructions and guidelines for installing the EZstat. Carefully review this information before installing the controllers. Installing the sensors includes the following topics that are covered in this section: • Mounting the EZstat • Connecting inputs • Connecting outputs • Connecting power • Maintenance 4.
Installation and Operation Manual ● Fan Coil Controller – EZstat 7. Turn the Allen screw counterclockwise until it backs out of the mounting base and engages the case. Turn Counterclockwise until the screw engages the base. To prevent mounting screw heads from toughing the circuit board in the controller, use only the mounting screws supplied. Using screws other than the type supplied may damage the EZstat unit. 4.
Installation and Operation Manual ● Fan Coil Controller – EZstat Water temperature sensor Connect a 10kΩ, Type III thermistor temperature probe (Nailor part #H1-1764B) to the water temperature (WST) input. The input includes the internal pull-up resistor. Follow the instructions supplied with the sensor for installation. Fig. 4-3 Wiring for a water temperature sensor WST GND 4.3 Connecting Outputs The EZstat outputs are configured for specific applications.
Installation and Operation Manual ● Fan Coil Controller – EZstat Connecting to a modulating fan The following diagram shows the connections for a modulating speed fan. • The fan start circuit must be a 24 VAC circuit. Connect it to the FAN- L output. • The speed control is a 0-10 VDC analog output. COM FAN-L Fig. 4-5 Connections for a modulating fan R A08 Connecting to modulating valves The following diagram shows the connections for a modulating mixing valves.
Installation and Operation Manual ● Fan Coil Controller – EZstat Connecting to On/Off valves The following diagram shows the connections for an on/off valve. • The valves are actuated by 24 VAC • The outputs are 24 V relays. Fig. 4-7 Connecting on/off valve COM R B05 4.4 Connecting Power The EZstat requires an external, 24 VAC power source. Use the following guidelines when choosing and wiring transformers. • Use only a Class-2 transformer of the appropriate size to supply power.
Installation and Operation Manual ● Fan Coil Controller – EZstat 5 USER FUNCTIONS This section covers topics for the end user in a facility. EZstat user functions are limited to changing the following functions: • Active temperature setpoints • Fan operation • Changing between heating and cooling • Override scheduled occupancy or occupancy based on the schedule in the EZstat. • Change the display between Fahrenheit and Celsius 5.
Installation and Operation Manual ● Fan Coil Controller – EZstat 5.2 Entering User or Admin Password (Password 1 & 2, respectively) User functions may require a password consisting of four numbers. Once either the User or Admin level password is entered, the functions will remain unlocked for 60-seconds after the last button is pushed. To set up the password levels, go to Create and/or change Passwords.
Installation and Operation Manual ● Fan Coil Controller – EZstat 5.4 Setting the operating modes The operating modes set the following functions: • Fan operation • Changing between heating and cooling • Override scheduled occupancy or occupancy that has been set by a schedule. • Change the display units from Fahrenheit to Celsius. Procedure Starting Display Steps Display 70 Start at the temperature display. AUTO 1. Push the button under the heating/cooling icon. 2.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Steps Display Entering an override setpoint can only take place if the EZstat is in the unoccupied mode. 1. Push the button under the unoccupied icon 2. Press either the password. or . button to change the first digit of the 3. Press the Enter button to select the next digit. Repeat for all four digits. Change the override setpoint 4. Press either the or 65 AUTO °F AUTO button to turn the override on or off.
Installation and Operation Manual ● Fan Coil Controller – EZstat 6.1 Create and/or Change Passwords For access to the commissioning functions you will need to know the Admin Level Password, also known as Password 2. If the controller has not been previously set up, no password is required and the user can either continue on to setup the User & Admin Level passwords (see table below) or proceed directly to the section of interest. Password Functions: • User Level – Calls up Password 1 in the program.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Select a commissioning function Steps Display Access to the commissioning functions always starts at the MAIN menu display. 6.2 Setting the commissioning setpoints The commissioning setpoints set the operational setpoints and limits for the EZstat. Setting commissioning setpoints requires entering Password 2 which is described in the topic Enter the Commissioning mode.
Installation and Operation Manual ● Fan Coil Controller – EZstat 6.3 Set up the communications Setting BACnet communications properties is required only if the EZstat is integrated into a network with other BACnet controllers. Entering the communications properties requires entering Password 2. See the topic Connecting to MS/TP network for network wiring details. Procedure Steps Display 70 1. Start at the temperature display. AUTO °F AUTO Starting Display 2. Enter Password 2.
Installation and Operation Manual ● Fan Coil Controller – EZstat 6.4 Set the time and date Setting the time and date requires entering Password 2. NOTE If the EZstat is connected to a BACnet network that includes a time service master, the time and date are automatically set to the network time and date. Set the time and date Procedure Steps Display 70 1. Start at the temperature display. AUTO Starting Display °F AUTO SECURITY ADMIN LEVEL 0000 2. Enter Password 2.
Installation and Operation Manual ● Fan Coil Controller – EZstat 6.5 Setting the occupancy schedule The schedule in the EZstat controls the occupancy mode. If the schedule is set to ON, the EZstat uses the occupied setpoint as the active setpoint. If the schedule is OFF, the unoccupied setpoint is used. NOTE The schedule in the EZstat is a BACnet schedule object. If the EZstat is connected to a BACnet network the schedule can be set up with a BACnet operator workstation.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Steps Display 1. Use a holiday schedule to override the values in the weekly schedule. Months and years can be entered as follows: • To choose ANY as the year, select the year and push the arrow past the current year • For month the choices are any of the twelve months of the year, ANY, EVEN, and ODD. Choose and set a holiday schedule 2.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Steps 3.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Steps Display How to Setup Fan CFM example: Set fan speeds for modulating speed fans Refer to the 35FH ECM Motor Fan Calibration Table. The VDC value correlates to the CFM on the calibration chart. Fan percentages are entered into the EZstat and convert output to VDC. For an example: 10% = ~1.0VDC 50% = ~5.0VDC 100% = ~10.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Steps From the SYSTEM menu choose MOD FAN and then choose one of the following motor types: Set Mod Fan Action Display MOD FAN ACTION STEP MODULATE • STEP (3-speed only) • MODULATE (default – ECM only) From the SYSTEM menu choose AUTO FAN RESET for ECM applications only. To adjust default time of 60 mins, select LOCAL OVRD TIME. This function protects from user accidentally changing out Auto Mode on interface.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Set DAT ENABLE for modulating valve Steps Display Select DAT ENABLE from the system menu to set the ENABLE or DISABLE feature. • ENABLED (default) – This function allows the modulating valve to be controlled by the DAT. DAT ENABLE: ENABLED DISABLED • DISABLED – If set to DISABLED, the function will not control the modulated valve. Enter 6.7 Advanced Options Use the advanced options to set up the following items.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Reset the application and choose units of measure. Steps Display Choosing an application will reset the EZstat. NOTE Choose LOOPS from the ADVANCED menu to adjust the values for the cooling or heating PID loops. Only the proportional and integral properties can be changed from the display. • The proportional default is 2° F. • The integral default is zero (0). Adjust the PID loops.
Installation and Operation Manual ● Fan Coil Controller – EZstat Procedure Steps Display Choose KEY LOCKOUT from the ADVANCED menu to limit accessibility to users with Password 1, the user password. • MODE/SETPOINTS—Users with Password 1 cannot change any value or mode. User lockout buttons • MODE—Users with Password 1 cannot change the heating/ cooling, fan, or occupancy modes.
Installation and Operation Manual ● Fan Coil Controller – EZstat 7.3 Automatic cooling and heating changeover The EZstat can be set to automatically change between the heating and cooling modes. • If the space temperature rises above the active cooling setpoint, the mode is set to cooling. • If the space temperature falls below the heating setpoint, the mode is set to heating. 7.4 Scheduling occupancy The schedule in the controller is a standard BACnet schedule object.
Installation and Operation Manual ● Fan Coil Controller – EZstat Modulating valves Cont. • Normal — The valve is fully closed when the output signal is 0 volts and fully open when the output is 10 volts DC. • Reverse —The valve is fully closed when the output signal is 10 volts and fully open when the output is 0 volts DC. Two-pipe water supply temperature evaluation For two-pipe fan coil units, the EZstat uses the WST sensor to determine if chilled or hot water is being supplied to the unit.
Installation and Operation Manual ● Fan Coil Controller – EZstat Modulating fans The fan starts a modulation fan on a call for either heating or cooling. The fan runs at the minimum dead band speed until the heating or cooling loop is above 50%, then the fan start to ramping up based on room temperature demand From 50% to 100% of the loop, the fan speed ramps to maximum speed. The minimum and maximum fan speeds are set from the user interface during system setup.
Installation and Operation Manual ● Fan Coil Controller – EZstat Output objects The following BACnet output objects represent values at the physical outputs of the EZstat.
Installation and Operation Manual ● Fan Coil Controller – EZstat Value objects BACnet value objects represent setpoints or other operational data in the EZstat. Setpoints—the analog value objects in the following table represent operational setpoints for the EZstat applications. All of the setpoints are available from the user interface.
Installation and Operation Manual ● Fan Coil Controller – EZstat Operating states and modes—the binary and multistate value objects represent operating conditions in the EZstat. Objects BV5 and BV36 are related to the schedule.
Installation and Operation Manual ● Fan Coil Controller – EZstat Table 8-9 PID control loops Value object Name Description LOOP1 CL LOOP Cooling Loop LOOP2 HT LOOP Heating Loop LOOP3 CL_DAT LOOP Cooling Loop LOOP4 HT_DAT LOOP Heating Loop The difference between the PID Loop types. • CL LOOP/HT LOOP - directly controls the fan and modulates off of room temperature • CL_DAT LOOP/HT_DAT LOOP - modulate to the DAT setpoints. The valves are controlled off these loops. NOTE 8.
Installation and Operation Manual ● Fan Coil Controller – EZstat The controllers or devices on the physical ends of the MS/TP wiring segment must have end-of-line (EOL) termination installed for proper network operation. Set the end-of-line termination to On using the EOL switches.
Installation and Operation Manual ● Fan Coil Controller – EZstat THIS PAGE IS LEFT INTENTIONALLY BLANK Date: 9-2014 Supersedes: NEW Page 36 of 36 Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
