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62

Table 18 — 

Operating Issues and Concerns

Fig. 77 — 

Typical Economi$er

®

 X Wiring Diagram

ISSUE OR CONCERN

POSSIBLE CAUSE AND REMEDY

My outdoor temperature reading on

the STATUS menu is not accurate.

Check the sensor wiring:

• Enthalpy sensors are to be wired to the S-Bus terminals.

• Temperature sensors are to be wired to the OAT and MAT terminals.

See Fig. 77.

If my enthalpy sensor drifts in accu-

racy over time, can I re-calibrate it?

Sensors cannot be re-calibrated in the field. However, the ADVANCED menu includes an item where you 

can input a limited offset in temperature and humidity for each sensor connected to the economizer.

Can I go back to factory defaults and 

start over?

Under the SYSTEM SETUP menu you can change the setpoints to the factory defaults.

Will I be able to see the LCD screen 

when it is in the unit?

The LCD screen has a backlight that is always illuminated.

What is a good setpoint for the Sup-

ply Air Temperature (SAT)?

The supply air temperature is the temperature of air that you want to supply to the space. In a commercial 

building, this is 50°F to 55°F (10°C to 13°C). The supply air is the mixing of the return air and the outdoor 

air.

I am using enthalpy sensors. Why did 

the control ask me to input a dry bulb 

changeover temperature?

If the humidity sensor in the enthalpy sensors fails, the backup algorithm in the control is to default to the 

temperature sensor in the enthalpy sensor.

In checkout, the outdoor damper 

closes when I command it to open.

Check the actuator linkage or rotation. In the CHECKOUT mode, the outdoor damper should drive open or 

closed with the return air damper having the opposite effect.

How do I set the minimum position?

The minimum position is set using the VENTMIN and VENTMAX setup in the SETPOINTS menu. VENT-

MIN is the minimum ventilation required when using an occupancy sensor and VENTMAX is the minimum 

ventilation when not using an occupancy sensor for Demand Controlled Ventilation. The VENTMAX position 

is set the same as with the potentiometer on the analog economizers, and is the output voltage to the 

damper actuator. The range is 2 Vdc closed OA damper and 10 Vdc open OA damper.

What if my damper does not go 

completely closed in the checkout 

operation?

Check the damper linkage or hub to make sure the damper is able to close completely.

How do I set the OCC?

There are two settings for OCC, INPUT and ALWAYS. INPUT is from the space thermostat, if it has an 

occupancy output. ALWAYS is the unit in the occupied mode, if the economizer is powered (fan on).

Does the economizer save my pro-

gram values if the unit loses power?

Yes, once the changes are stored in the controller they will be stored until they are changed by the operator.

If the unit is left in checkout, how 

long will the unit stay in checkout 

mode without input?

The unit will remain in checkout for 10 minutes, then return to normal operation.

Содержание WeatherExpert 50LC14

Страница 1: ...en Controller Factory Installed Option 43 SystemVu Controller Factory Installed Option 43 Integrated Staging Control ISC 44 SEQUENCE OF OPERATION Economi er X Factory Installed Option 46 UNIT INSTALLA...

Страница 2: ...this equipment during installation There may be more than one disconnect switch Tag all disconnect locations to alert others not to restore power until work is completed WARNING UNIT OPERATION AND SAF...

Страница 3: ...Al Cu Al Cu C E coat Al Cu Al Cu D E coat Al Cu E coat Al Cu E Cu Cu Al Cu F Cu Cu Cu Cu M Al Cu Al Cu Louvered Hail Guard N Precoat Al Cu Al Cu Louvered Hail Guard P E coat Al Cu Al Cu Louvered Hail...

Страница 4: ...4 Fig 2 50LC Vertical Airflow Size 14...

Страница 5: ...5 Fig 3 50LC Horizontal Airflow Size 14...

Страница 6: ...6 Fig 4 50LC Back View and Condensate Drain Location Size 14...

Страница 7: ...7 Fig 5 50LC Corner Weights and Clearances Size 14...

Страница 8: ...8 Fig 6 50LC Bottom View Size 14...

Страница 9: ...9 Fig 7 50LC Vertical Airflow Sizes 17 20...

Страница 10: ...10 Fig 8 50LC Horizontal Airflow Sizes 17 20...

Страница 11: ...11 Fig 9 50LC Back View and Condensate Drain Location Sizes 17 20...

Страница 12: ...12 Fig 10 50LC Corner Weights and Clearances Sizes 17 20...

Страница 13: ...13 Fig 11 50LC Bottom View Sizes 17 20...

Страница 14: ...14 Fig 12 50LC Vertical Airflow Sizes 24 26...

Страница 15: ...15 Fig 13 50LC Horizontal Airflow Sizes 24 26...

Страница 16: ...16 Fig 14 50LC Back View and Condensate Drain Location Sizes 24 26...

Страница 17: ...17 Fig 15 50LC Corner Weights and Clearances Sizes 24 26...

Страница 18: ...18 Fig 16 50LC Bottom View Sizes 24 26...

Страница 19: ...nsate line trap and piping 9 Make electrical connections 10 Install other accessories PAD MOUNTED INSTALLATION 1 Prepare pad and unit supports 2 Rig and place unit 3 Remove duct covers and top skid 4...

Страница 20: ...level concrete slab that extends a minimum of 6 in 150 mm beyond unit cabinet Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstruct ing airflow NOTE H...

Страница 21: ...21 Fig 19 Roof Curb Details 14 Size Unit...

Страница 22: ...22 Fig 20 Roof Curb Details 17 and 20 Size Units...

Страница 23: ...23 Fig 21 Roof Curb Details 24 and 26 Size Units...

Страница 24: ...jury For vertical supply and return units tools or parts could drop into ductwork and cause an injury Install a 90 degree turn in the return ductwork between the unit and the conditioned space If a 90...

Страница 25: ...cks are shipped in a carton that is secured to the rear of the blower assembly Access the carton location through rear panel see Fig 25 Fig 24 Hood Top Shipping Position Fig 25 Hood Package Shipping L...

Страница 26: ...Fig 29 Barometric Hood Parts BAROMETRIC HOOD VERTICAL CONFIGURATION 1 Remove the hood top panel from its shipping position on the unit end see Fig 30 Fig 30 Shipping Location Vertical Units 2 Remove...

Страница 27: ...opening in the bottom panel or airflow into the outside air hood will be restricted See Fig 34 Fig 34 Relief Damper 2 Cut a 16 in x 36 in opening in the return duct for the relief damper see Fig 34 3...

Страница 28: ...an result in damage to the drain pan See Fig 39 Fig 39 Condensate Drain Pan Piping Details All units must have an external trap for condensate drainage In stall a trap at least 4 in 102 mm deep and pr...

Страница 29: ...R connect the source leads to the terminal block with unit field power leads See Fig 40 Fig 40 Location of TB1 Field power wires are connected to the unit at line side pressure lugs on the terminal bl...

Страница 30: ...30 Fig 42 50LC 14 26 Electro Mechanical Control Wiring Diagram...

Страница 31: ...31 Fig 43 50LC 14 26 RTU Open Control Wiring Diagram...

Страница 32: ...32 Fig 44 50LC 14 26 SystemVu Control Wiring Diagram...

Страница 33: ...33 Fig 45 Typical Power Wiring Diagram Electro Mechanical and RTU Open Controls 50LC 14 24 Units 208 230V Shown...

Страница 34: ...34 Fig 46 Typical Power Wiring Diagram Electro Mechanical and RTU Open Controls 50LC 15 24 Units 460V 575V Shown...

Страница 35: ...35 Fig 47 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 208 230V Shown...

Страница 36: ...36 Fig 48 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 460V 575V Shown...

Страница 37: ...7 Install the handle on to the corner post vertically with the red arrow pointing up 8 Secure the handle to the corner post with 2 screws and lock washers supplied Fig 49 Handle and Shaft Assembly fo...

Страница 38: ...B 224 v BC 231 v AC 226 v Average Voltage 224 231 226 681 227 3 3 Voltage Imbalance 100x 4 1 78 227 IMPORTANT If the supply voltage phase imbalance is more than 2 contact your local electric utility c...

Страница 39: ...This type requires the field installation of a general purpose 125 v 15A circuit powered from a source elsewhere in the building Ob serve national and local codes when selecting wire size fuse or brea...

Страница 40: ...unit See unit nameplate and label on factory installed HACR for the amp rating of the HACR that was shipped with the unit from the factory Fig 56 See unit nameplates for the proper fuse HACR or maxi...

Страница 41: ...e routed through the rubber grommet located on the corner post adjacent to the control box ac cess panel Route wire through the grommet and then route the wire behind the corner post utilizing the fac...

Страница 42: ...IZER SYSTEM CONTROL CONNECTIONS NOTE It is suggested to ensure the Auto Changeover function of an installed thermostat is enabled when used in conjunction with the Humidi MiZer Adaptive Dehumidificati...

Страница 43: ...hown in Fig 64 RTU Open Controller Factory Installed Option For details on operating 50LC 014 26 units equipped with the factory installed RTU Open option refer to 48 50LC07 26 Factory Installed Optio...

Страница 44: ...3 and wiring to the Smoke Shutdown terminal The Smoke Alarm terminal on the ISC Board provides a pass thru connection should a smoke alarm signal be connected In the case of the RTU Open option the R...

Страница 45: ...will run and the outdoor fan will run at low speed If there is further de mand for cooling the outdoor air damper will maintain its current position compressor C2 will run and the outdoor fan will run...

Страница 46: ...thalpy sensor when provided see below then assembling and mounting the unit s outside air hood Refer to the base unit s in stallation instruction manual for directions on locating the hood parts packa...

Страница 47: ...and holding the or button causes the display to automatically increment or decrement 1 Press the Enter button to accept the displayed value and store it in nonvolatile RAM CHANGE STORED displays 2 Pre...

Страница 48: ...xed air from SAT sensor in fan section Displays _ _ _ if not connected short or out of range See Note 2 DA TEMP nn F or C 0 to 140 F 18 to 60 C DISCHARGE AIR TEMPERATURE after Heating section Accessor...

Страница 49: ...RVE ES3 ES1 ES2 ES3 ES4 or ES5 ENTHALPY CHANGEOVER CURVE Requires enthalpy sensor option Enthalpy boundary curves for economizing using single enthalpy DCV SET 1100ppm 500 to 2000ppm increment by 100...

Страница 50: ...temperature falls below setup value FREEZE POS CLO CLO or MIN FREEZE PROTECTION DAMPER POSITION Damper position when freeze protection is active CLO closed MIN MIN POS or VENT MAX CO2 ZERO 0ppm 0 to 5...

Страница 51: ...pen position DAMPER CLOSE N A N A Positions damper to the fully closed position CONNECT Y1 O N A N A Closes the Y1 O relay Y1 O CONNECT Y2 O N A N A Closes the Y2 O relay Y2 O CONNECT AUX1O N A N A En...

Страница 52: ...ITY SENSOR COMMON IAQ 24V 24 VAC AIR QUALITY SENSOR 24 VAC SOURCE ACT 2 10 2 10 VDC DAMPER ACTUATOR OUTPUT 2 10 VDC ACT COM COM DAMPER ACTUATOR OUTPUT COMMON ACT 24V 24 VAC DAMPER ACTUATOR 24 VAC SOUR...

Страница 53: ...D 6 5 4 3 2 1 AUX2 I OCC EXH 1 AUX1 O E GND Y2 I Y1 I Y1 O C R Y2 O W7220 CONTROLLER W1 BLUE GRAY OAT 1 20 K OHM PNO HH79NZ007 SAT 20 K OHM PNO HH79NZ007 CO2 SENSOR 1 If no Enthalpy sensor connected 2...

Страница 54: ...thalpy sensor When the OA temperature OA humidity and OA dew point are all below the selected boundary the economizer sets the econo mizing mode to YES economizing is available When all of the OA cond...

Страница 55: ...and VENTMAX L These settings are higher than the comparable High speed settings and cause the out side air damper to open more to allow the same Va and Vbz air flow rates to be admitted to the space A...

Страница 56: ...TILATION FOR PEOPLE VENTILATION FOR SOURCES INCREASING VENTILATION VENTMAX H VENTMIN H 100 700 INSIDE OUTSIDE CO2 DIFFERENTIAL VENTILATION FOR PEOPLE VENTILATION FOR SOURCES INCREASING VENTILATION VEN...

Страница 57: ...esistance vs tempera ture characteristics The OAT sensor is attached to the outside air damper frame It is connected to the W7220 s OAT input terminals If an accessory enthalpy sensor is added to an E...

Страница 58: ...r X with W7220 controller and thermostat or unitary controller that energizes the G terminal in cooling and heating to control the supply fan operation Table 16 W7220 Input Output without CO2 Sensor F...

Страница 59: ...po sition will shift to MIN POS H third stage cooling starts As space temperature falls the thermostat will remove its call for third stage cooling ISC terminal Y3 call is removed The supply fan will...

Страница 60: ...DCV maximum ventilation point is VENTMAX H DCV operation will float between its VENTMIN and VENT MAX settings never exceeding the VENTMAX limit as the space CO2 level varies according to changes in pe...

Страница 61: ...Delay Upon power up or after a power outage or brownout the W7220 controller module begins a 5 minute power up delay before en abling mechanical cooling Power Loss Outage or Brownout All setpoints and...

Страница 62: ...the control is to default to the temperature sensor in the enthalpy sensor In checkout the outdoor damper closes when I command it to open Check the actuator linkage or rotation In the CHECKOUT mode t...

Страница 63: ...m is in heating mode SD Enables configuration of shutdown not available on 2 speed See Table 7 on page 48 Menu Note 4 FAN TYPE 2speed 2 speed required Sets the economizer controller for operation of 1...

Страница 64: ...tilation MAT T CAL 0 0 1 0 F or C 2 5 F 1 4 C SUPPLY AIR TEMPERATURE CALIBRATION Allows the operator to adjust for an out of calibration supply air temperature SAT sensor OA T CAL 2 0 3 0 F or C 2 5 F...

Страница 65: ...m level below the setpoint MIN POS L 6 0 V 2 to 10 Vdc VENTILATION MINIMUM POSITION AT LOW SPEED Displays ONLY if a CO2 sensor is NOT connected MIN POS H 4 4 V 2 to 10 Vdc VENTILATION MINIMUM POSITION...

Страница 66: ...cy Drive See Fig 79 for the VFD location Fig 78 Variable Frequency Drive VFD Fig 79 VFD Location MULTI SPEED VFD DISPLAY KIT FIELD INSTALLED ACCESSORY NOTE The Remote VFD Keypad is part of the Multi S...

Страница 67: ...selected menu Status Quick Menu or Main Menu 1 Com LED Flashes when bus communications is communicating 2 Green LED On Control selection is working 3 Yellow LED Warn Indicates a warning 4 Flashing Red...

Страница 68: ...ndoor Fan Speeds NOTE This procedure requires use of the VFD Keypad which is included as part of the field installed Multi Speed VFD display kit P N CRDISKIT002A00 If the VFD keypad is not already in...

Страница 69: ...id Type a Press the Menu key to move the triangle icon so it is positioned over the Main Menu The display shows the following b Press OK twice The display changes to c Press Down arrow key three times...

Страница 70: ...ided in Tables 19 23 beginning on page 73 Press OK again to set the selected value g Press Down arrow twice The following display appears h Press OK to highlight the number in brackets then use the Up...

Страница 71: ...owing display appears e Press Down arrow key once The following dis play appears f Press Down arrow key again The following dis play appears NOTE Press OK to highlight the HZ value and then use the Up...

Страница 72: ...rs f Press OK to highlight the number in the bracket g Use the Up arrow and Down arrow keys to change the number to 3 for 2 automatic resets then press OK The display changes to h Press Down arrow key...

Страница 73: ...WA381 131L9868 122 15 460 13 7 1760 575V HD62FL576 HK30WA384 131N0229 132 15 575 8 9 1760 MOTOR OPTION VOLTAGE START DELAY sec FLYING START MIN SPEED FOR FUNCTION Hz MOTOR THERMAL PROTECTION PRESET RE...

Страница 74: ...54 HK30WA386 131L9869 1 122 16 460 16 9 1755 575V HD64FL576 HK30WA388 131N0233 1 132 16 575 12 6 1755 MOTOR OPTION VOLTAGE START DELAY sec FLYING START MIN SPEED FOR FUNCTION Hz MOTOR THERMAL PROTECTI...

Страница 75: ...0WA386 131L9869 122 16 460 16 9 1755 575V HD64FL576 HK30WA388 131N0233 132 16 575 12 6 1755 MOTOR OPTION VOLTAGE START DELAY sec FLYING START MIN SPEED FOR FUNCTION Hz MOTOR THERMAL PROTECTION PRESET...

Страница 76: ...0WA386 131L9869 122 16 460 16 9 1755 575V HD64FL576 HK30WA388 131N0233 132 16 575 12 6 1755 MOTOR OPTION VOLTAGE START DELAY sec FLYING START MIN SPEED FOR FUNCTION Hz MOTOR THERMAL PROTECTION PRESET...

Страница 77: ...76 HK30WA388 131N0233 132 16 575 12 6 1755 MOTOR OPTION VOLTAGE START DELAY sec FLYING START MIN SPEED FOR FUNCTION Hz MOTOR THERMAL PROTECTION PRESET REFERENCE 1 71 1 73 1 82 1 90 3 10 0 3 10 1 3 10...

Страница 78: ...MAGNET Locate the magnet it is shipped in the control box area ADDITIONAL APPLICATION DATA Refer to Factory Installed Smoke Detectors for Small and Me dium Rooftop Units 2 to 25 Tons for discussions o...

Страница 79: ...SET SCREW SET SCREW STRAIGHT EDGE BELT SPAN DEFLECTION BELT SPAN 64 Table 1 Table 2 BELT CROSS SECTION SMALLEST SHEAVE DIAMETER BELT DEFLECTION FORCE LBS UNNOTCHED BELTS NOTCHED BELTS USED NEW USED N...

Страница 80: ......

Страница 81: ......

Страница 82: ...ht to discontinue or change at any time specifications or designs without notice and without incurring obligations Catalog No 04 53500292 01 Printed in U S A Form 50LC 14 26 06SI Pg 82 1 2021 Replaces...

Страница 83: ...erminals are tight Y N _____ Check that indoor air filters are clean and in place Y N _____ Check that outdoor air inlet screens are in place Y N _____ Verify that unit is level Y N _____ Check fan wh...

Страница 84: ...ing air temperature _______________ F D Liquid line temperature at outlet or reheat coil _______________ F E Confirm correct rotation for compressor Y N _____ F Check for correct ramp up of outdoor fa...

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