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YC-IOM-12

18-EB60D14

Library

Service Literature

Product Section

Unitary

Product

Rooftop Lt. Comm.

Model

YC

Literature Type

Installation/ Oper/ Maint

Sequence

12

Date

October 2001

File No.

SV-UN-RT-YC-IOM-12 10/01

Supersedes

New

Since the manufacturer has a policy of continuous product improve-
ment, it reserves the right to change specifications and design without
notice. The installation and servicing of the equipment referred to in this
booklet should be done by qualified, experienced technicians.

© American Standard Inc. 2001

Models:
YC*150 - 301 (60 Hz)
YC*125 - 250 (50 Hz)

INSTALLATION
OPERATION
MAINTENANCE

Customer Property — Contains wiring, service,
and operation information. Please retain.

Packaged Gas Electric
12-1/2 Thru 25 Ton

IMPORTANT NOTE: All phases of this installation must comply with the NATIONAL, STATE & LOCAL CODES. In
addition to local codes, the installation must conform with National Electric Code -ANSI/NFPA NO. 70 LATEST
REVISION
. These units are equipped with an electronic unit control processor, (UCP) that provides service functions
which are significantly different from conventional units. Refer to the TEST MODES and START-UP PROCEDURES
before attempting to operate or perform maintenance on this unit.

Summary of Contents for YC 100B Series

Page 1: ...Standard Inc 2001 Models YC 150 301 60 Hz YC 125 250 50 Hz INSTALLATION OPERATION MAINTENANCE Customer Property Contains wiring service and operation information Please retain Packaged Gas Electric 1...

Page 2: ...ontrols using DC Analog Input Outputs 14 Controls using DC Communication Links 14 Space Temperature Averaging 18 Pre Installation Checklist 21 Voltage Imbalance 21 Electrical Phasing 22 Compressor Cra...

Page 3: ...e schedule is provided at the end of this manual Should equipment fail ure occur contact a qualified service organization with quali fied experienced HVAC technicians to properly diagnose and repair t...

Page 4: ...py sensor or comparative humidity return air humidity against ambient humidity sensors if selected to control the dampers to an accuracy of 5 of the stroke The actuator is spring re turned to the clos...

Page 5: ...can be acti vated by opening a field supplied contact Anytime this circuit is opened for 5 continuous seconds the compressor for that circuit is turned off immediately The compressor will not be allo...

Page 6: ...not walk on the sheet metal base pans NO STEP SURFACE FOR ACCESS TO COMPONENTS THE BASE SHEET METAL SURFACE MUST BE REINFORCED Bridging between the unit s main supports may consist of multiple 2 by 12...

Page 7: ...data for each unit is illustrated in Fig ure 3 2 A Center of Gravity illustration and the dimensional data is shown in Figure 3 5 Table 3 1 lists the typical unit operating and point loading weights...

Page 8: ...15 16 51 5 16 2 YC 125C 49 63 5 16 94 5 16 39 3 8 6 13 16 13 16 8 3 8 2 3 16 28 5 8 2 YC 150D 151C 50 1 8 71 5 16 107 5 16 48 3 8 6 5 8 13 16 8 3 8 2 11 16 29 5 16 2 YC 155B 175C YC 180B 210C YC 181C...

Page 9: ...ting a footing foundation Anchor the unit to the slab using hold down bolts or isolators Isolators should be installed to minimize the transmission of vibrations into the building For rooftop applicat...

Page 10: ...atwalk around the unit is strongly recommended to provide easy access for unit maintenance and service Recommendations for installing the Supply Air and Return Air ductwork joining the roof curb are i...

Page 11: ...the lifting hook and the top of the unit should be 7 feet 4 Test lift the unit to ensure it is properly rigged and bal anced make any necessary rigging adjustments 5 Lift the unit and position it int...

Page 12: ...that the power supply complies with the electric heater specifications on the unit and heater nameplate Inspect the heater junction box and control panel tighten any loose connections Check electric h...

Page 13: ...R S O N LY UNIT TERMINALS ARE NOT DESIGNED TO ACCEPT OTHER TYPES OF CONDUCTORS Failure to do so may cause damage to the equip ment Main Unit Power Wiring The electrical service must be protected from...

Page 14: ...vices and the system components utilizing a DC analog input output signal to the unit Note Resistance in excess of 2 5 ohms per conductor can cause deviations in the accuracy of the controls b Ensure...

Page 15: ...em switch settings Heat Cool Auto and Off and two fan settings On and Auto with four system status LED s It is a manual or auto changeover control with dual setpoint capability It can be used with a r...

Page 16: ...Temperature Sensor BAYFRST001A This sensor is only applicable on units equipped with a Trane Communication Interface Module It provides high limit shutdown of the unit and requires a manual reset The...

Page 17: ...the economizer dampers from 0 to 50 of fresh air entering the space Table 3 7 Temperature versus Resistance temperature vs resistance coefficient is negative 3000 3200 3400 3600 3800 4000 4200 20 40...

Page 18: ...ing Example 1 illustrates two series circuits with two sensors in each circiut wired in parallel The square of any number of remote sensors required Example 2 illustrates three sensors squared in a se...

Page 19: ...at Exchanger 40 F Notes 1 This Unit has a negative pressure gas valve Never adjust to a positive pressure 2 A voltage reading across pens V V is equatable to the flame sensing current One volt equals...

Page 20: ...20 General Information Figure 3 10 Typical Unit Gas Train Configuration...

Page 21: ...the unit must meet stringent requirements for the unit to operate properly Measure each leg phase to phase of the power supply Each reading must fall within the utilization range stamped on the unit n...

Page 22: ...rant condenses in the compressor and mixes with the oil In lower ambient condi tions refrigerant migration to the compressor could increase When the compressor starts the sudden reduction in crankcase...

Page 23: ...a time when a jumper is installed across the test terminals The unit will start the first test step and change to the next step every 30 seconds At the end of the test mode control of the unit will au...

Page 24: ...op for all of the accessories installed on the unit i e curb economizer etc Note Static pressure is based on desired CFM and may not be actual static pressure 3 Add the total accessory static pressure...

Page 25: ...n power discon nect switch to the Off position or proceed to the next component start up procedure Return Air Smoke Detector The return air smoke detector is designed to shut off the unit if smoke is...

Page 26: ...several times for two to three seconds will be required When starting the unit for the first time or servicing the heaters it is a good practice to start the heater with the main gas supply turned Of...

Page 27: ...st the belt tension as follows 1 To determine the appropriate belt deflection a Measure the center to center shaft distance in inches between the fan and motor sheaves b Divide the distance measured i...

Page 28: ...are is tight Inspect the F A R A damper hinges and pins to ensure that all moving parts are securely mounted Keep the blades clean as necessary Verify that all damper linkages move freely lubricate wi...

Page 29: ...ion to 150 F maximum to improve its cleansing capability CONTAINS REFRIGERANT SYSTEM CONTAINS OIL AND REFRIGERANT Do not heat the detergent and water solution above 150o F Hot liquids sprayed on the e...

Page 30: ...b Temp Oil Press Press Press heat cool Oil Press Press Press heat cool Date F Level Psig Psig Psig F F Level Psig Psig Psig F F ok ok low low ok ok low low ok ok low low ok ok low low ok ok low low ok...

Page 31: ...ve the system in that mode for up to one hour while trouble shooting Refer to the sequence of operations for each mode to assist in verifying proper operation Make the necessary repairs and proceed to...

Page 32: ...ective terminal wire 6 through 10 from the Zone Sensor to the unit LTB1 terminals 6 through 10 Note If the system is equipped with a programmable zone sensor BAYSENS019A BAYSENS020A or BAYSENS023A the...

Page 33: ...3 Range 100 to 900 Ohms approximate Heat SP Terminals 2 and 5 Range 100 to 900 Ohms approximate Trouble Shooting Test 3 System Mode and Fan Selection The combined resistance of the Mode selection swi...

Page 34: ...r On Off Longer On On Special Trouble Shooting Note The Special setting is used when a very short heating cycle is required typically used when the equipment heat capacity is over sized for the applic...

Page 35: ...0 47 VDC 3 Turn the minimum position potentiometer one half turn clockwise so that the screw driver slot is straight up and down Measured voltage should be approximately 1 18 VDC 4 Turn the minimum p...

Page 36: ...e sensor if it is out of range Conventional Thermostat Interface CTI Test Procedures This series of tests will allow you to test the CTI and verify the output to the UCP Test 1 will verify the MODE ou...

Page 37: ...per the following terminals on the LTB1 the voltage measured should be as follows Expected DC Volts Terminals Jumpered DC Volts Measured None 5 0 5 LTB1 14 to LTB1 1 3 7 5 LTB1 14 to LTB1 4 3 1 5 LTB1...

Page 38: ...ntor factory or warehouse at Warrantor designated shipping point freight allowed to Buyer s city replacement parts for Warrantor s products covered under this warranty Warrantor shall not be obligated...

Page 39: ...s warranty is extended by American Standard Inc and applies only to commercial equipment rated 20 Tons and larger and related accessories Warrantor warrants for a period of 12 months from initial star...

Page 40: ...40...

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