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INSTALLATION
OPERATION
MAINTENANCE
Customer Property — Contains wiring, service,
and operation information. Please retain.
Models:
YC*150 - 301 (60 Hz)
YC*125 - 250 (50 Hz)
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.
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
Library
Product Section
Product
Model
Literature Type
Sequence
Date
File No.
Supersedes
Packaged Gas Electric
12-1/2 Thru 25 Ton
YC-IOM-12
18-EB60D14
Service Literature
Rooftop Lt. Comm.
Installation/ Oper/ Maint
October 2001
SV-UN-RT-YC-IOM-12 10/01
Unitary
YC
12
New
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Table of Contents
Related Manuals for American Standard YC 100B Series
Summary of Contents for American Standard YC 100B Series
- Page 1 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...
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Page 2: Table Of Contents
Table of Contents Compressor Crankcase Heaters ....... 22 Literature Change History ........... 3 Unit Start-up .............. 23 Unit Description ............4 Test Modes ..............23 Standard Controls Description ........4 Unit Start-up .............. 25 System Input Devices & Functions ......4 Verifying Proper Air Flow ........... -
Page 3: Literature Change History
General Information Literature Change History Model Number Description All products are identified by a multiple-character model YC-IOM-12 (October 2001) number that precisely identifies a particular type of unit. An First issue of manual; provides Installation, Operation, and explanation of the alphanumeric identification code is pro- Maintenance instructions for 12-1/2 through 25 Ton pack- vided below. -
Page 4: Unit Description
General Information UEM - Unit Economizer Module (Optional) Unit Nameplate The UEM monitors the supply air temperature, return air A Mylar unit nameplate is located on the unit’s corner temperature, minimum position setpoint (local or remote), support just above the main power entrance access into the power exhaust setpoint, ambient dry bulb/enthalpy sensor or control panel. - Page 5 General Information Active - AFF (Active Fan Failure) When the fan proving High Pressure Control switch is connected across terminals J5-3 & J5-4 on the The high pressure controls are wired in series between the unit economizer module (UEM), if air flow through the unit compressor outputs on the UCP and the compressor is not proven by the differential pressure switch (factory contactor coils.
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Page 6: Unit Inspection
General Information Unit Inspection As soon as the unit arrives at the job site NO STEP SURFACE! [ ] Verify that the nameplate data matches the data on the sales order and bill of lading (including electrical data). FOR ACCESS TO COMPONENTS, THE BASE SHEET METAL SURFACE MUST BE REINFORCED. -
Page 7: Unit Dimensions & Weight Information
General Information Unit Dimensions & Weight Information Overall unit dimensional 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 General Information Figure 3-2 Unit Dimensional Data UNITS YC*100B 63- 5/16 93 -3/4 13/16 25 -5/8 2 -3/16 8 -3/8 44 -15/16 51 -5/16 YC*125C 63-5/16 94-5/16 39-3/8 6-13/16 13/16 8-3/8 2-3/16 28-5/8 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...
- Page 9 General Information cedures. Table 3-1 Ductwork Typical Unit Weights & Point Loading Data Unit Corner Wts. (lbs) Figure 3-3 illustrates the supply and return air openings as Models Weight viewed form the rear of the unit. Refer to Table 3-2 for the YC*100B 1247 unit opening dimensional data.
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Page 10: Roof Curb
General Information Table 3-2 Horizontal Unit Supply & Return Air Opening Dimensional Data UNITS YCH100B 22-1/2 17-3/16 3-15/16 41-7/16 YCH125C YCH150D,151C 26-1/2 19-9/16 24-9/16 3-15/16 42-1/2 YCH155B,180B YCH175C,210C YCH181C,200B 26-1/2 24-1/16 27-9/16 3-15/16 46-7/16 5-3/8 YCH211C,240B YCH241C,250B YCH300B,301C Roof Curb If a Curb Accessory Kit is not used: Downflow a. -
Page 11: Rigging
General Information Table 3-3 Downflow Unit Supply & Return Air Opening Dimensional Data UNITS Drain YC D 100B 22-7/16 14-1/2 17-11/16 4-1/4 — 4-1/4 54-13/16 47-3/16 24-5/8 1 N PT YC D 125C YC D 150D YC D 151C YC D 155B 26-7/16 22-1/2 18-11/16 4-1/4... -
Page 12: Factory Installed Economizer
General Information Electric Heat Requirements [ ] Assemble and install the roof curb (if applicable). Refer to the latest edition of the curb installers guide that ships with each curb kit. [ ] Verify that the power supply complies with the electric heater specifications on the unit and heater nameplate. -
Page 13: Filter Installation
General Information Figure 3-6 Main Unit Power Wiring Condensate Trap Installation The electrical service must be protected from over current and short circuit conditions in accordance with NEC require- ments. Protection devices must be sized according to the electrical data on the nameplate. 1. -
Page 14: Field Installed Control Wiring
General Information Field Installed Control Wiring termination point does not exceed two and a half (2.5) ohms/conductor for the length of the run. An overall layout of the various control options available with the required number of conductors for each control device is c. - Page 15 General Information Remote Zone Sensor (BAYSENS013C) Figure 3-8 This electronic sensor features remote zone sensing and Typical Field Wiring Diagrams for Optional Controls timed override with override cancellation. It is used with a Trane Integrated Comfort building management system. Zone Panel (BAYSENS006B) This electronic sensor features three system switch settings (Em Heat, Heat, Cool, and Off) and two fan settings (On and Auto).
- Page 16 General Information High Temperature Sensor (BAYFRST001A) ture setpoints, week day, time, and operational mode This sensor is only applicable on units equipped with a Trane symbols. If the power is interrupted, the program is retained Communication Interface Module. It provides high limit in permanent memory.
- Page 17 General Information Remote Minimum Position Potentiometer (BAYSTAT023A) This device can be used with units with an economizer. It allows the operator to remotely set the position of 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)
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Page 18: Space Temperature Averaging
General Information Space Temperature Averaging Space temperature averaging is accomplished by wiring a number of remote sensors in a series/parallel circuit. Using the BAYSENS016* or BAYSENS017*, at least four sensors are required to accomplish space temperature averaging. Example #1 illustrates two series circuits with two sensors in each circiut wired in parallel. - Page 19 General Information Gas Heater Operating Data Heating Input Rate – BTUH 135,000 205,000 Minimum Supply Gas Pressur Natural/ LP 3.5” w.c./ 8.0” w.c. Manifold Gas Pressure (See Note 1) -0.2” w.c Combustion Blower Suction Pressure (1st Stage) -2.1 to -3.1” w.c. -0.8 to -1.2” w.c. (With Gas Valve Closed) (2nd Stage) -2.1 to -3.1”...
- Page 20 General Information Figure 3-10 Typical Unit Gas Train Configuration...
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Page 21: Pre-Installation Checklist
Pre-Installation Checklist Use the checklist provided below in conjunction with the Voltage Imbalance “General Unit Requirements” checklist to ensure that the unit is properly installed and ready for operation. Three phase electrical power to the unit must meet stringent requirements for the unit to operate properly. Measure each leg (phase-to-phase) of the power supply. -
Page 22: Electrical Phasing
Pre-Installation Checklist Electrical Phasing Compressor Crankcase Heaters (Three Phase Motors) Each compressor is equipped with a crankcase heater. The The compressor motor(s) and the supply fan motor are proper operation of the crankcase heater is important to internally connected for the proper rotation when the maintain an elevated compressor oil temperature during the incoming power supply is phased as A, B, C. -
Page 23: Unit Start-Up
Unit Start-up Test Modes There are three methods in which the “Test” mode can be cycled at LTB1-Test 1 and LTB1-Test 2. 1. Step Test Mode - This method initiates the different com- ponents of the unit, one at a time, by temporarily shorting across the two test terminals for two to three seconds. - Page 24 Unit Start-up Verifying Proper Air Flow 4. Measure the amperage at the supply fan contactor and compare it with the full load amp (FLA) rating stamped on (Units with Direct Drive Indoor Fan) the motor nameplate. Much of the systems performance and reliability is closely a.
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Page 25: Unit Start-Up
Unit Start-up Verifying Proper Air Flow Return Air Smoke Detector ( Units with Belt Drive Indoor Fan) The return air smoke detector is designed to shut off the unit Much of the systems performance and reliability is closely if smoke is sensed in the return air stream. Sampling the associated with, and dependent upon having the proper airflow entering the unit at the return air opening performs airflow supplied both to the space that is being conditioned... -
Page 26: Unit Start-Up
Unit Start-up 4. Verify that the dampers stroked to the full open position. 5. To stop the SERVICE TEST, turn the main power discon- H A Z A R D O U S G A S E S ! nect switch to the “Off” position or proceed to the next component start-up procedure. -
Page 27: Final System Setup
Unit Start-up Final System Setup 3. Set the small O-ring at zero on the force scale of the gauge plunger. After completing all of the pre-start and start-up procedures 4. Place the large end of the gauge at the center of the belt outlined in the previous sections (i.e., operating the unit in span;... -
Page 28: Maintenance
Maintenance [ ] Check supply fan motor bearings; repair or replace the Monthly Maintenance motor as necessary. Before completing the following checks, turn the unit OFF [ ] Check the fan shaft bearings for wear. Replace the bear- and lock the main power disconnect switch open. ings as necessary. -
Page 29: Coil Cleaning
Maintenance 6. Spray the leaving-airflow side of the coil first; then spray Coil Cleaning the opposite side of the coil. Allow the cleaning solution to stand on the coil for five minutes. Regular coil maintenance, including annual cleaning, enhances the unit’s operating efficiency by minimizing: 7. - Page 30 Maintenance Table 6-2 Sample Maintenance Log Refrigerant Circuit #1 Refrigerant Circuit #2 Current Ambient Compr. Suct. Disch. Liquid Super- Sub- Compr. Suct. Disch. Liquid Super- Sub- Temp. Press. Press. Press. heat cool. Press. Press. Press. heat cool. Date Level (Psig) (Psig) (Psig) Level (Psig) (Psig) (Psig) - ok...
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Page 31: System Status Checkout Procedure
Maintenance System Status Checkout Procedure The UCP has the ability to provide the service personnel with some unit diagnostics and system status information. “System Status” is checked by using one of the following two Before turning the main power disconnect switch “Off”, follow methods: the steps below to check the Unit Control Processor (UCP). -
Page 32: Trouble Shooting
Trouble Shooting 4. LPC1 has opened during the 3 minute minimum “on time” Note: If the system is equipped with a during 4 consecutive compressor starts, check LPC1 or programmable zone sensor, (BAYSENS019A, LPC2 by testing voltage between the J2-2 terminal on the BAYSENS020A or BAYSENS023A), the LED UCP and ground. - Page 33 Trouble Shooting This LED being turned “On”, will have no other affect on unit Test 3 operation. It is an indicator only. System Mode and Fan Selection Fan Failure Switch The combined resistance of the Mode selection switch and This LED will remain flashing the entire time the fan proving the Fan selection switch can be measured between termi- switch is open with the fan operating (40 second delay) and nals 2 and 4 on the Zone Sensor.
- Page 34 Trouble Shooting 3. Reconnect wires to terminals LTB1-11 and LTB1-12. Mea- Note: The Special setting is used when a very short sure voltage again between LTB1-11 and LTB1-12, volt- heating cycle is required, typically used when the age should flash high and low every 0.5 seconds. The equipment heat capacity is over sized for the voltage on the low end will measure about 19 VDC, while application, will alleviate temperature swings.
- Page 35 Trouble Shooting 4. Turn the minimum position potentiometer fully clockwise. 4. If the ECA is not driving the dampers in Step 3, measure Measured voltage should be approximately 1.70 VDC. the DC voltage output between the UEM connector termi- nals J1-10 and J1-2 on the UEM. The voltage measured If the voltages measured in Steps 1, 2, 3, and 4 are while the ECA is driving closed should be approximately consistent with the listed values, the UCP, UEM...
- Page 36 Trouble Shooting Test 1 Check the resistance at the wires going to the OAS and Testing the MODE output measure the temperature at the OAS location. Using the Temperature versus Resistance chart, verify the accuracy 1. Turn the main power disconnect switch “Off”. Check the of the OAS.
- Page 37 Trouble Shooting 3. Turn the main power disconnect switch “On”. 4. Jumper the following terminals on LTB1, the measured voltage should be as follows: Unit Control Processor (UCP) Switch Settings Switch Switch Heat H A Z A R D O U S V O LTA G E ! Anticipation Normal (Default) HIGH VOLTAGE IS PRESENT AT THE TERMINAL...
- Page 38 Models Less Than 20 Tons for Commercial Use* This warranty is extended by American Standard Inc., to the original purchaser and to any succeeding owner of the real property to which the Combination Gas Electric Air Conditioner is originally affixed, and applies to products purchased and retained for use within the U.S.A.
- Page 39 RATED 20 TONS AND LARGER AND RELATED ACCESSORIES PRODUCTS COVERED - This warranty* is extended THE WARRANTY AND LIABILITY SET by American Standard Inc. and applies only to FORTH HEREIN ARE IN LIEU OF ALL commercial equipment rated 20 Tons and larger and OTHER WARRANTIES AND LIABILITIES, related accessories.