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Installation, Operation, and Maintenance
Direct Gas-Fired
Dedicated Outdoor Air Rooftop Unit
Models:
RRU120**D*B, RRU150**D*B, RRU180**D*B, RRU240**D*B, RRU300**D*B
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.
November 2021
SAFETY WARNING
RRU-SVX01F-EN
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Table of Contents
Related Manuals for Trane RRU120 D B Series
Summary of Contents for Trane RRU120 D B Series
- Page 1 Installation, Operation, and Maintenance Direct Gas-Fired Dedicated Outdoor Air Rooftop Unit Models: RRU120**D*B, RRU150**D*B, RRU180**D*B, RRU240**D*B, RRU300**D*B SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
- Page 2 POUR VOTRE SÉCURITÉ appliance is hazardous. Il est dangereux d’utiliser ou d’entreposer de l’essence ou autres liquides ou vapeurs inflammables dans des récipients ouverts à proximité de cet appareil. ©2021 Trane RRU-SVX01F-EN...
- Page 3 Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs and HCFCs such as saturated or unsaturated HFCs and HCFCs.
- Page 4 Follow EHS Policies! Failure to follow instructions below could result in death or serious injury. • All Trane personnel must follow the company’s Environmental, Health and Safety (EHS) policies when performing work such as hot work, electrical, fall protection, lockout/tagout, refrigerant handling, etc.
- Page 5 Introduction General Safety Information ATTENTION Information Specific to Direct Gas-Fired Suivre les Procédures de l’EHS! Heating Lenon-respect des consignes suivantes peut être à l’origine de blessures graves,voire mortelles. WARNING • Tous les membres du personnel externes à l'entreprise sont tenus de respecter les règles établies Safety Alert! par l'entreprise en matière d'environnement, de santé...
- Page 6 Safety Alert! This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in Failure to follow instructions below could result in part without written permission. Trane reserves the right death or serious injury.
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Page 7: Table Of Contents
Table of Contents Model Number Descriptions Refrigerant Capacity Controller Operation and ....8 Adjustment ......48 General Information . -
Page 8: Model Number Descriptions
Model Number Descriptions DIGIT 1, 2, 3 — UNIT TYPE DIGIT 19 — CONTROLS No Controls Non - DDC Controls DIGIT 4, 5 — COOLING 4.8aL - MP581 with Display CAPACITY 4.9.1L - MP581 with Display 10 = 10 Tons 4.8aL - UC600 with Display 12 = 12.5 Tons... -
Page 9: General Information
General Information number, serial number, electrical characteristics, refrigerant charge, as well as other pertinent unit data. WARNING Hazardous Service Procedures! Compressor Nameplate Failure to follow all precautions in this manual and on The nameplate for the compressors are located on the side the tags, stickers, and labels could result in death or of the compressor. - Page 10 General Information Outdoor Air Temperature and Relative will be locked out, and a manual reset will be required to restart the compressor. Humidity Sensor Low Pressure Control ReliaTel Control This factory installed combination outdoor air sensor located in the outdoor air hood is designed to sense both When the LPC is opened for one continuous second, the outdoor air temperature and relative humidity for use by compressor for that circuit is turned off immediately.
- Page 11 General Information through a remoter operator display or by removing and Notify the appropriate sales representative before reapplying power to the unit. installing or repairing a damaged unit. Units will be suitable for use with natural gas only. Through the Base Electrical with WARNING Disconnect Switch Fiberglass Wool!
- Page 12 General Information accumulation on the unit’s electrical and/or mechanical components. Unit Clearances WARNING Combustible Materials! Failure to maintain proper clearance between the unit and combustible materials could cause a fire which could result in death, serious injury, or property damage. Refer to unit nameplate and installation instructions for proper clearances.
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Page 13: Unit Clearances
Unit Clearances Figure 1. Typical installation clearances for single- and multiple-unit applications RRU-SVX01F-EN... -
Page 14: Unit/Curb Dimensions
Unit/Curb Dimensions Figure 2. Unit dimensional data 10-ton high efficiency Figure 3. Roof curb dimensional data 10-ton high efficiency RRU-SVX01F-EN... - Page 15 Unit/Curb Dimensions Figure 4. Unit dimensional data 12.5- and 15-ton high efficiency Figure 5. Roof curb dimensional data 12.5- and 15-ton high efficiency RRU-SVX01F-EN...
- Page 16 Unit/Curb Dimensions Figure 6. Unit dimensional data 20- and 25-ton high efficiency Figure 7. Roof curb dimensional data 20- and 25-ton high efficiency RRU-SVX01F-EN...
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Page 17: Unit Service Clearances
Unit Service Clearances Figure 8. Unit dimensional data 12.5-, 15-, and 20-ton high efficiency RRU-SVX01F-EN... -
Page 18: Unit Weight/Rigging
Unit Weight/Rigging WARNING WARNING Heavy Objects! Improper Unit Lift! Failure to follow instructions below or properly lift unit Failure to properly lift unit in a LEVEL position could could result in unit dropping and possibly crushing result in unit dropping and possibly crushing operator/ operator/technician which could result in death or technician which could result in death or serious injury, serious injury, and equipment or property-only damage. -
Page 19: Sequence Of Operation
Sequence of Operation Terminology Optional—Requires Space Temperature & RH Sensors Controls OSSP Occupied Space Cooling OSHO Occupied Space Heating Offset RRUCM RRU Main Control Module OSRS Occupied Space Humidity Remote Operator Display NHSP Unoccupied Space Heating Outdoor Damper End Switch NCSP Unoccupied Space Cooling Air Proving Switch... - Page 20 Sequence of Operation adjustable HGRH (Hot Gas Reheat) Control Dead Band Y1 - O/AIR COOLING ENABLE SET POINT (CSP): 68°F–80°F (HGRHD) set point at the RRUCM. On call for reheat, the 78°F DEFAULT RRUCM energizes the Reheat Valve (RHV) through the R5 Relay when the SAT falls below Occupied S/Air Heating COOL 1 is activated through RTRM Y1 by the RRUCM Set Point (HSP) minus HGRHD and is de-energized when...
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Page 21: Power On-Control Input "Unoccupied
Sequence of Operation The active supply air heating setpoint will be displayed on The SHC inputs space relative humidity readings to the the System Heating Status Screen on the ROD. RRUCM. The RRUCM resets OES1 and OES2 set points in an attempt to maintain the space humidity. -
Page 22: Power On-"Emergency Stop
Sequence of Operation “Unoccupied” Cooling and “Unoccupied” Cooling Or Dehumidification Mode With R/Air Dehumidification Mode Damper “UNOCCUPIED” Contact OPEN at RRUTS – 7 & 8 RRUCM Energizes the Indoor Fan Motor (IDM) through “Unoccupied” Heating Mode— IDM Relay R2 R2 Energizes RTRM Terminal G and IDM Non-recirculating (100 Percent Outdoor STARTS Fan Failure Switch (FFS) Proves Airflow UNOCCUPIED COOLING or DEHUMIDIFICATION MODE... -
Page 23: Installation
Do not Assemble and install the roof curb (if applicable). field install ultraviolet lights in Trane air handling Refer to the latest edition of the curb installers guide equipment for the intended purpose of improving that ships with each curb kit. -
Page 24: Condensate Drain Configuration
Installation • J = H*0.5 Connect properly sized and protected power supply • L = H + J + 0.75 in. wiring to a fieldsupplied/installed disconnect switch and to the main power terminal block (HTB1) in the Notes: unit control panel. 1. - Page 25 Installation Field Installed Control Wiring requirements. Protection devices must be sized according to the electrical data on the nameplate. An overall layout of the various control options available 1. Location of the applicable electrical service entrance is with the required number of conductors for each control shown in “Unit/Curb Dimensions,”...
- Page 26 Installation Table 2. 24V AC conductors Figure 11. Space sensor field wiring (optional) Distance from Unit to Recommended Wire Control Size 000–460 feet 18 gauge 000–140 m 0.75 mm 461–732 feet 16 gauge Controls using DC Analog Input/Output (Standard Low Voltage Multiconductor Wire) WARNING Hazardous Voltage w/Capacitors!
- Page 27 Installation Figure 12. Typical field wiring diagrams for optional controls Use the following checklist in conjunction with “General Check all electrical connections for tightness and Unit Requirements,” p. 23 to ensure that the unit is “point of termination” accuracy. properly installed and ready for operation.
- Page 28 Installation The 2.2 percent imbalance in this example exceeds the Verify that the correct size and number of filters are in maximum allowable imbalance of 2.0 percent. This much place. imbalance between phases can equal as much as a ...
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Page 29: Compressor Crankcase Heaters
Installation Observe the ABC and CBA phase indicator lights on the face of the sequencer. The ABC indicator light will glow if the phase is ABC. If the CBA indicator light glows, open the disconnect switch or circuit protection switch and reverse any two power wires. ... -
Page 30: System Configuration And Pre-Start
System Configuration and Pre-Start Standard Unit Controller Model Figure 15. Tracer UC600: System Setup UC600 ® ® The Tracer UC600 is a BACnet unit controller that is designed to work with the Tracer SC and third-party BACnet MS/TP systems. Additional expansion modules including the XM30, XM32, and/or XM70 may be factory installed and wired as supplied options require. - Page 31 System Configuration and Pre-Start Table 4. RRU UC600 points list Point Point Active Type Instance Point Name Value Unit Reference Priority Priority Owner S/Air Temperature Local °F UI1.analogValue O/Air Temperature Local °F UI2.analogValue Outdoor Air RH Local -24.91 UI3.analogValue Space RH (Optional) AO1/UI09.analogValue Space Temp (Optional) °F...
- Page 32 System Configuration and Pre-Start Table 4. RRU UC600 points list (continued) Point Point Active Type Instance Point Name Value Unit Reference Priority Priority Owner O/Air Damper End Switch UI4.binaryValue Occupancy Control Input Local UI5.binaryValue Fan Status Switch Local UI6.binaryValue Emergency Stop Input UI7.binaryValue 2-Position OA Damper FanControlIFV48aBacNet...
- Page 33 System Configuration and Pre-Start Table 4. RRU UC600 points list (continued) Point Point Active Type Instance Point Name Value Unit Reference Priority Priority Owner Unocc Cooling Mode ModeandSetpointsDFandIFV48aPart1BacNet Unocc Heating Mode ModeandSetpointsDFandIFV48aPart1BacNet Space Heat Lockout ModeandSetpointsDFandIFV48aPart1BacNet Space Temp Sensor Failure AlarmsDFandIFV48aBacNet Space RH Sensor Failure AlarmsDFandIFV48aBacNet...
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Page 34: Startup
Startup Compressor Startup Table 5. Override (at Home screen) Override Occupancy 1 of 4 Override Occupancy WARNING Adj. Occupied Hazardous Service Procedures! Adj. Unoccupied Adj. OCC-Bypass Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or Adj. -
Page 35: Direct Gas-Fired Heating Startup
Startup 7. Check the compressor oil levels. The oil level in each Notes: compressor sight glass should be 1/2 to 3/4 full when • BEFORE OPERATING, leak test all gas piping up to they are “Off”. heater gas valve. Smell around the unit area for gas. If gas is smelled, do NOT attempt to place heater in 8. - Page 36 Startup 3. Check Inlet Gas Pressure and Confirm Gas Flow Figure 17. Air proving switch location to Unit WARNING Hazard of Explosion! Failed gas components could explode or leak flammable gas which could cause a fire resulting in death or serious injury or property damage. Do NOT expose gas controls to pressures above 1/2 psi (3.5 kPa).
- Page 37 Startup Figure 18. Burner gas train Figure 19. Direct gas-fired electrode and flame rod alignment MSO2 MSO1 • Starting Sequence Note: In the event Outdoor Air Conditions or Unit Controls are such that the unit will not automatically enter the desired operating modes, refer to “Alarms and Troubleshooting,”...
- Page 38 Startup ii. When pressure at PG2 stabilizes, confirm PG1 6. Burner Gas Train, Ignition Controls and Starting and PG2 pressures are within ±5 percent of the Sequence for Gas Input Rating > 400 MBh pressures shown on Burner Data Plate. Refer to Figure Figure 20.
- Page 39 Startup Initiate • After ignition trials, and with the presence of flame, the main fuel valve, terminal 9, is powered. If a flameout The relay module enters the initiate sequence when it is occurs, the relay module locks out or recycles powered.
- Page 40 Startup • Clipping and removing a jumper after 200 hours of Figure 21. Sequence status LEDs operation causes a non-resettable fault 100. The relay module must then be replaced. Figure 23. Relay module plug-in diagram Figure 22. Selectable site-configurable jumpers Operation of the Direct Spark Ignition Control Gas Valve WARNING...
- Page 41 Startup enter lockout with all outputs off. Reset is accomplished by signal is released at end of each 90-second warm-up period cycling the power off for a minimum of 5 seconds. • High Fire Test Following Normal Burner Starting Sequence –...
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Page 42: Final System Setup
Final System Setup After completing all of the pre-start and startup procedures outlined in the previous sections (i.e., operating the unit in each of its modes through all available stages of cooling and heating), perform these final checks before leaving the unit: ... -
Page 43: Maintenance
Maintenance a straightedge placed across the fan and motor sheaves. Refer to Figure WARNING 5. Remove the belt tension gauge. The small O-ring now Hazardous Service Procedures! indicates a number other than zero on the plunger’s Failure to follow all precautions in this manual and on force scale. -
Page 44: Monthly Maintenance
Maintenance Monthly Maintenance Check the fan shaft bearings for wear. Replace the bearings as necessary. Before completing the following checks, turn the unit OFF Check the supply fan belt. If the belt is frayed or worn, and lock the main power disconnect switch open. replace it. - Page 45 Maintenance Heater Annual Maintenance Note: The complete burner assembly may have to be removed for proper inspection and cleaning. Any accumulation of scale or foreign material on either WARNING side of the mixing plates should be removed with a wire brush. Visually check that no holes in the Hazardous Gases and Flammable Vapors! mixing plates are blocked.
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Page 46: Coil Cleaning
Maintenance 7. Replace all access panels which have been removed anticipated. On multi-row coils, starting from the coil and operate the unit for a test period. manifold end, construction consists of a section (slab) of multi-row fins up to the coil bend and a section of single 8. - Page 47 Maintenance Evaporator and General Coil Cleaning Recommended Cleaning Procedures Procedures for Slab Coils Regular coil maintenance, including annual cleaning- enhances the unit’s operating efficiency by minimizing compressor head pressure and amperage draw. The WARNING condenser coil should be cleaned at least once each year Hazardous Voltage w/Capacitors! or more if the unit is located in a “dirty”...
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Page 48: Refrigerant Capacity Controller Operation And Adjustment
Maintenance Figure 27. Refrigerant capacity controller WARNING No Step Surface! Failure to follow instruction below could result in death or serious injury. Do not walk on the sheet metal base.Walking on the base could cause the supporting metal to collapse and result in the operator/technician falling. - Page 49 Maintenance Table 10. Sample maintenance log Refrigerant Circuit #1 Refrigerant Circuit #2 Current Ambient Disch. Liquid Super- Sub- Compr. Suct. Disch. Disch. Liquid Super- Sub- Temp. F/ Compr. Suct. Press. Press. Press. heat cool. Press. Press. Press. Press. heat cool. Date Oil Level psig/kPa...
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Page 50: Alarms And Troubleshooting
Alarms and Troubleshooting Standard Unit Controller Model Comprehensive system alarms and diagnostics are accessed through the Alarms icon at the unit display UC600 (RRUCM) discussed later in the section, or through Tracer TU programming on connected computer. Sensor failures Microprocessor Control may be viewed through the Alarms icon. - Page 51 Alarms and Troubleshooting Table 12. UC600 troubleshooting (continued) Table 11. UC600 alarms (continued) Point Diagnostic Possible Cause Trouble Possible Cause BAS communication down Compressor limit switch(es) open OA Humidity Failed sensor or improper sensor Compressor relay not energized or failed No Compressor Source Failure installation...
- Page 52 Alarms and Troubleshooting Gas Ignition Controls present, the CLP has not tripped. If no voltage is present, CLP has tripped. Direct-Fired Unit Flame Relays 400 MBh System Failure Measure the voltage between terminals J6-9 and J6-6. WARNING • Normal Operation = approximately 32 Vdc Hazardous Service Procedures! •...
- Page 53 Alarms and Troubleshooting Table 14. Lockout models B, H D, and J only—Green LED status codes Green LED Flash Indicates Next System Action Recommended Service Action Code No “Call for Heat” Not applicable None Flash Fast Power up - internal check Not applicable None Heartbeat Normal startup - ignition...
- Page 54 Alarms and Troubleshooting Table 15. Troubleshooting guide for flame relays during problem of safety shutdown (lockout) Occurs In Occurs If Initiate Period • Purge card is not installed or removed • Purge card is bad • Configuration jumpers have been changed (after 200 hours) •...
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Page 55: Warranty
Commercial Use* Attention: Manager, Product Service GW-602-4800 This warranty is extended by Trane, to the original purchaser and to any succeeding owner of the real * This warranty is for commercial usage of said equipment property to which the Air Conditioner is originally affixed,... - Page 56 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.