RFI Attachment 1 Unit Description and Service Facts.pdf

�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. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

Packaged Cooling

15 Ton Rooftop Units with ReliaTel™ Controls

July 2011 RT-SVF21D-EN

Service Facts

Models: TC*180F(3,4,W,K)

YC*180F(3,4,W,K)

Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note that warnings, cautions and notices appear at appropriate intervals throughout this manual. Warnings are provided to alert installing contractors to potential hazards that could result in personal injury or death. Cautions are designed to alert personnel to hazardous situations that could result in personal injury, while notices indicate a situation that could result in equipment or property-damage-only accidents.

Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

Important

Environmental Concerns!

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing 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 such as HCFCs and HFCs.

Responsible Refrigerant Practices!

Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

�WARNING

Contains Refrigerant!

System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system. See unit nameplate for refrigerant type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives. Failure to follow proper procedures or the use of non-approved refrigerants, refrigerant substitutes, or refrigerant additives could result in death or serious injury or equipment damage.

�WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

ATTENTION: Warnings, Cautions and Notices appear at appropriate sections throughout this literature. Read these carefully.

�WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

�CAUTION: Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.

NOTICE: Indicates a situation that could result in equipment or property-damage-only accidents.

© 2011 Trane All rights reserved RT-SVF21D-EN

Warnings, Cautions and Notices

�WARNING

Hazard of Explosion and Deadly Gases!

Never solder, braze or weld on refrigerant lines or any unit components that are above atmospheric pressure or where refrigerant may be present. Always remove refrigerant by following the guidelines established by the EPA Federal Clean Air Act or other state or local codes as appropriate. After refrigerant removal, use dry nitrogen to bring system back to atmospheric pressure before opening system for repairs. Mixtures of refrigerants and air under pressure may become combustible in the presence of an ignition source leading to an explosion.

Excessive heat from soldering, brazing or welding with refrigerant vapors present can form highly toxic gases and extremely corrosive acids. Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

�WARNING

Proper Field Wiring and Grounding Required!

All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/ state electrical codes. Failure to follow codes could result in death or serious injury.

�WARNING

Personal Protective Equipment (PPE) Required!

Installing/servicing this unit could result in exposure to electrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians MUST put on all Personal Protective

Equipment (PPE) recommended for the work being undertaken. ALWAYS refer to appropriate

MSDS and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals, ALWAYS refer to appropriate MSDS and

OSHA guidelines for information on allowable personal exposure levels, proper respiratory protection and handling recommendations.

• If there is a risk of arc or flash, technicians MUST put on all Personal Protective Equipment (PPE) in accordance with NFPA70E or other country-specific requirements for arc/flash protection

PRIOR to servicing the unit.

Failure to follow recommendations could result in death or serious injury.

RT-SVF21D-EN 3

4 RT-SVF21D-EN

Table of Contents

General Data

Performance Data

Electrical Data

Sequence of Operation ReliaTel Control Cooling without an Economizer ReliaTel Control Evaporator Fan Operation Low Ambient Operation ReliaTel Control Cooling with an Economizer Economizer Set-Up ReliaTel Control Heating Operation for Cooling Only Units ReliaTel Control Heating Operation for Gas Units Modulating Gas Heat 5:1 Ignition Module Ignition Control Module Diagnostics

Pressure Curves

Subcooling Charging Curves

Refrigerant Circuit

General Data

Table 1. General data—cooling 15 tons standard efficiency

15 Tons Downflow & Horizontal Units

TC*180F3,4,W,K YC*180F3,4,WL/H,K

Cooling Performance(a)

(a)Cooling Performance is rated at 95°F ambient, 80°F entering dry bulb, 67°F entering wet bulb. Gross capacity does not include the effect of fan motor heat. ARI capacity is net and includes the effect of fan motor heat. Units are suitable for operation to ±20% of nominal cfm. Certified in accordance with the Unitary Large Equipment Certification Program, which is based on ARI Standard 340/360-93.

Gross Cooling Capacity 181,000 181,000

EER (Downflow/Horizontal)(b)

(b)EER is rated at ARI conditions and in accordance with ARI Standard 210/240 or 360.

11 11

Nominal Airflow cfm 5300 5300

ARI Net Cooling Capacity 176,000 176,000

Integrated Energy Efficiency Ratio (IEER)(c) 12.2 12.2

Percent Capacity @ part load (Stage 1/Stage 2) 68/100 68/100

System Power (kW) 16.00 16.00

Compressor Number/Type 2 / Scrolls 2 / Scrolls

Sound Outdoor Sound Rating (BELS)(d) 9.2 9.2

Outdoor Coil Type Microchannel Microchannel

Coil Width (in.) 1.0 1.0

Face Area (sq. ft.) 35.2 35.2

Rows/FPI 1 / 20 1 / 20

Indoor Coil Type Hi-Performance Hi-Performance

Tube Size (in.) ID 0.3125 0.3125

Face Area (sq. ft.) 26.00 26.00

Rows/FPI 3 / 15 3 / 15

Refrigerant Control Short Orifice Short Orifice

Drain Connection Number/Size (in.) 1/1.00 NPT 1/1.00 NPT

Outdoor Fan Type Propeller Propeller

Number Used/Diameter (in.) 2 / 26 2 / 26

Drive Type/No. Speeds Direct / 1 Direct / 1 cfm 11,000 11,000

Number Motors/hp 2 / 0.50 2 / 0.50

Motor rpm 1,100 1,100

Indoor Fan Type FC Centrifugal FC Centrifugal

Number Used/Diameter (in.) 1 / 18x18 1 / 18x18

Drive Type/No. Speeds Belt / 1 Belt / 1

Number Motors 1 1

Motor hp (Standard/Oversized) 3.0 / 5.0 3.0 / 5.0

Motor rpm (Standard/Oversized) 1,740 / 3,450 1,740 / 3,450

Motor Frame Size (Standard/Oversized) 145T / 145T 145T / 145T

Filters Type Furnished(e) Throwaway Throwaway

Number Size Recommended

Downflow (4)20x20x2 (4)20x25x2 (4)20x20x2 (4)20x25x2

Horizontal (8)20x25x2 (8)20x25x2

Refrigerant Charge (Pounds of R-410A)(f)

Downflow / Horizontal 11.4 / 6.0 11.4 / 6.0

RT-SVF21D-EN 5

General Data

(c) Integrated Energy Efficiency Ratio (IEER) is rated in accordance with AHRI standard 210/240 or 360.

(d)Outdoor Sound Rating shown is tested in accordance with ARI Standard 270 or 370.

(e)An optional 2-inch pleated filter is also available.

(f) Refrigerant charge is an approximate value. For a more precise value, see unit nameplate and service instructions.

* Indicates both downflow and horizontal units.

Table 2. General data—heating—15 tons standard efficiency

15 Tons Downflow & Horizontal Units

Heating Performance(a)(Gas/Electric Only)

(a) Heating Performance limit settings and rating data were established and approved under laboratory test conditions using American National Standards Institute standards. Ratings shown are for elevations up to 2000 feet. For ele-vations above 2000 feet, ratings should be reduced at the rate of 4% for each 1000 feet above sea level.

Heating Models Low High Modulating Turn Down

= 5:1

Heating Input (Btu/h) 250,000 350,000 350,000

1st Stage (Btu) 175,000 250,000 70,000

Heating Output (Btu/h) 203,000 284,000 283,500

1st Stage (Btu) 142,000 203,000 56,700

AFUE% (DF/HF)(b)

(b) AFUE is rated in accordance with DOE test procedures.

Downflow/Horizontal 80.7/79.9 80.1/79.1 80.1/79.1

Steady State Efficiency% 81.0 81.0 81.0

No. Burners 1 1 1

No. Stages 2 2 N/A

Gas Supply Line Pressure (in. wc) 2.5/14.0 2.5/14.0 2.5/14.0

Natural or LP (minimum/maximum) Natural or LP Natural or LP Natural Only

Gas Connection Pipe Size (in.) 1/2 3/4 3/4

6 RT-SVF21D-EN

Performance Data

Table 3. Evaporator fan performance 15 tons TC*180F standard refrigeration system downflow or horizontal

External Static Pressure (Inches of Water)

0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp

3-hp Standard Motor & Low Static Drive Accessory

4800 — — — — 462 0.98 494 1.10 526 1.24 559 1.40 589 1.55 618 1.70 648 1.87 675 2.05

5400 — — 464 1.14 496 1.28 525 1.42 554 1.56 582 1.71 611 1.89 640 2.06 666 2.23 692 2.40

6000 463 1.30 500 1.48 531 1.65 559 1.80 585 1.95 611 2.11 636 2.28 662 2.46 689 2.66 714 2.85

6600 502 1.70 537 1.88 567 2.08 594 2.27 619 2.42 643 2.59 666 2.76 689 2.94 712 3.13 736 3.35

7200 541 2.16 574 2.37 603 2.58 630 2.79 654 2.98 676 3.16 698 3.34 720 3.52 741 3.72 762 3.92

3-hp Standard Motor Drive 5-hp Oversized Motor & Drive

Continued

External Static Pressure (Inches of Water)

1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp

3-hp Standard Motor & Drive 3-hp Standard Motor & High Static Drive Accessory 5-hp Oversized Motor & Drive

4800 701 2.23 727 2.41 752 2.60 776 2.80 799 3.00 822 3.20 844 3.39 865 3.59 886 3.78 907 3.98

5400 718 2.59 744 2.79 768 2.98 791 3.18 813 3.39 836 3.61 857 3.83 879 4.05 899 4.27 920 4.50

6000 738 3.04 760 3.22 784 3.43 808 3.65 831 3.86 852 4.08 873 4.30 893 4.53 913 4.77 933 5.01

6600 760 3.56 783 3.77 805 3.98 826 4.18 847 4.40 868 4.63 890 4.87 911 5.10 930 5.35 949 5.59

7200 783 4.13 805 4.37 827 4.60 848 4.84 869 5.06 889 5.29 907 5.51 927 5.75 — — — —

Notes:

1. Fan motor heat (MBh) = 3.15 x Fan bhp.

2. Data includes pressure drop due to standard filters and wet coils. No accessories or options are included in pressure drop data.

3. Factory supplied motors, in commercial equipment, are definite purpose motors, specifically designed and tested to operate reliably and continuously at all cataloged conditions. Using the full horsepower range of our fan motors as shown in our tabular data will not result in nuisance tripping or premature motor failure. Our product’s warranty will not be affected.

RT-SVF21D-EN 7

Table 4. Evaporator fan performance 15 tons with gas heat YC*180F standard refrigeration system downflow or horizontal

External Static Pressure (Inches of Water)

0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp

3-hp Standard Motor & Low Static Drive Accessory 3-hp Standard Motor Drive

4800 — — — — 475 1.02 506 1.15 539 1.30 571 1.46 600 1.61 630 1.77 659 1.94 686 2.12

5400 — — 481 1.22 511 1.35 540 1.49 568 1.63 596 1.80 626 1.97 653 2.15 679 2.31 705 2.49

6000 486 1.41 520 1.59 549 1.75 576 1.89 601 2.05 627 2.21 652 2.39 679 2.58 704 2.78 729 2.97

6600 529 1.84 560 2.03 588 2.22 613 2.38 637 2.55 660 2.72 684 2.90 706 3.08 730 3.29 754 3.51

7200 572 2.36 601 2.56 627 2.77 651 2.96 674 3.14 696 3.32 717 3.50 739 3.69 759 3.90 781 4.11

5hp Oversized Motor & Drive

Continued

External Static Pressure (Inches of Water)

1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 cfm rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp rpm bhp

3-hp Standard Motor & Drive 3-hp Standard Motor & High Static Drive Accessory

5-hp Oversized Motor & Drive

4800 711 2.30 737 2.49 761 2.68 785 2.88 808 3.08 831 3.27 853 3.47 874 3.66 894 3.86 915 4.06

5400 732 2.69 756 2.88 779 3.08 802 3.29 825 3.50 847 3.72 868 3.94 889 4.16 910 4.39 930 4.61

6000 752 3.15 775 3.35(a) 799 3.56 822 3.78 844 4.00 865 4.22 885 4.44 906 4.68 926 4.92 946 5.16

6600 777 3.72 800 3.93 821 4.13 841 4.34 863 4.57 885 4.81 906 5.04 925 5.28 945 5.53 — —

7200 803 4.34 825 4.58 846 4.81 867 5.04 887 5.26 905 5.49 924 5.72 — — — — — —

Notes:

1. Fan motor heat (MBh) = 3.15 x Fan bhp.

2. Data includes pressure drop due to standard filters and wet coils. No accessories or options are included in pressure drop data.

3. Factory supplied motors, in commercial equipment, are definite purpose motors, specifically designed and tested to operate reliably and continuously at all cataloged conditions. Using the full horsepower range of our fan motors as shown in our tabular data will not result in nuisance tripping or premature motor failure. Our product’s warranty will not be affected.

(a)3-hp Standard Motor & High Static Drive Accessory

8 RT-SVF21D-EN

* Indicates both downflow and horizontal units.

* Indicates both downflow and horizontal units.

Table 5. Standard motor and drive/fan speed (rpm)

Tons Unit Model Number 6 Turns Open

5 Turns Open

4 Turns Open

3 Turns Open

2 Turns Open

1 Turn Open Closed

15 T/YC*180F3,4,W,K 559 600 642 683 725 766 N/A

Note: Factory set at 3 turns open.

Table 6. Oversized motor and drive/fan speed (rpm)

Tons Unit Model Number 6 Turns Open

5 Turns Open

4 Turns Open

3 Turns Open

2 Turns Open

1 Turn Open Closed

15 T/YC*180F3,4,W,K 695 747 799 851 903 953 N/A

Table 7. Static pressure drop through accessories (inches water column)

Tons Unit Model

Number cfm Standard Filters(a)

Through Reheat

Coil

2” MERV 7

Filter(b)

2” MERV 13

Filter(b)

Economizer with OA/RA Dampers(c)

Electric Heater Accessory (kW)(d)

100%

OA

100%

RA 5–12 14–27 36 54 72

T/YCH180F

4800 0.03 — 0.06 0.09 0.14 0.03 — 0.04 0.04 0.05 —

6000 0.05 — 0.09 0.13 0.20 0.04 — 0.06 0.07 0.08 —

7200 0.07 — 0.11 0.16 0.27 0.05 — 0.09 0.10 0.12 —

T/YCD180F

4800 0.04 — 0.07 0.11 0.14 0.03 — 0.04 0.04 0.05 —

6000 0.06 — 0.10 0.14 0.20 0.04 — 0.06 0.07 0.08 —

7200 0.09 — 0.13 0.18 0.27 0.05 — 0.09 0.10 0.12 —

(a)Tested with: 2” filters 12½–25 tons.

(b)Difference in pressure drop should be considered when utilizing optional 2” pleated filters.

(c) OA = Outside Air and RA = Return Air.

(d)Nominal kW ratings at 240, 480, 600 volts.

RT-SVF21D-EN 9

10 RT-SVF21D-EN

Electrical Data

Table 8. Unit wiring with cooling (no electric heat) or gas heat—standard refrigeration system

Tons Unit Model

Number Unit Operating Voltage Range

Standard Indoor Fan Motor Oversize Indoor Fan Motor

Minimum Circuit Ampacity(a)

Maximum Fuse Size or Maximum Circuit

Breaker Minimum Circuit

Ampacity

Maximum Fuse Size or Maximum Circuit

Breaker

T/YC*180F3 187–253 75 100 81 110

T/YC*180F4 414–506 38 50 40 50

T/YC*180FW 517–633 31 40 33 45

T/YC*180FK 342–418 49 60 — —

(a)For Standard and Oversized Indoor Fan Motor, values do not include power exhaust accessory.

* Indicates both downflow and horizontal units.

Table 9. Unit wiring with electric heat (single point connection)—standard refrigeration system (downflow and horizontal)

Tons Unit Model

Number Heater Model

Number Heater kW

Rating Control Stages

Standard Indoor Motor Oversize Indoor Motor

MCA

Max Fuse Size or Max Circuit

Breaker MCA

Max Fuse Size or Max Circuit

Breaker(a)

208/230 Volts Three Phase

15 TC*180F3

AYDHTRK318/AYHHTRN318 13.5/18.0 1 75/75 100/100 81/81 110/110

AYDHTRK336/AYHHTRM336 27.0/36.0 2 108/122 110/125 115/130 125/150

AYDHTRK354/AYHHTRM354 40.5/54.0 2 154/176 175/200 162/184 175/200

460 Volts Three Phase

15 TC*180F4

AYDHTRL418/AYHHTRM418 18.0 1 38 50 40 50

AYDHTRK436/AYHHTRM436 36.0 2 61 70 64 70

AYDHTRK454/AYHHTRM454 54.0 2 88 90 91 100

575 Volts Three Phase

15 TC*180FW

AYDHTRKW18/AYHHTRMW18 18.0 1 31 40 33 45

AYDHTRMW36/AYHHTRMW36 36.0 2 49 50 51 60

AYDHTRKW54/AYHHTRMW54 54.0 2 70 70 73 80

380 Volts Three Phase

15 TC*180FK

AYDHTRL418/AYHHTRM418 18 2 49 60 — —

AYDRTK436/AYHHTRM436 36 2 55 60 — —

AYDTRK454/AYHHTRM454 54 2 76 80 — —

(a) Values do not include power exhaust accessory.

Sequence of Operation

The ReliaTel Controls is a microelectronic control feature, which provides operating functions that are significantly different than conventional electro mechanical units. The master module is the ReliaTel Refrigeration Module (RTRM).

The RTRM provides compressor anti-short cycle timing functions through minimum “Off” and “On” timing to increase reliability, performance, and to maximize unit efficiency.

Upon power initialization, the RTRM performs self-diagnostic checks to ensure that all internal controls are functioning. It checks the configuration parameters against the components connected to the system.

The LED located on the RTRM module is turned “On” within one second after power-up if all internal operations are okay.

ReliaTel Control Cooling without an Economizer

When the system switch is set to the “Cool” position and the zone temperature rises above the cooling setpoint controlband, the RTRM energizes the (K9) relay coil located on the RTRM. When the (K9) relay contacts close, the compressor contactor (CC1) coil is energized provided the low pressure control (LPC1), high pressure control (HPC1) and discharge line thermostat (DLT 1) are closed.

When the CC1 contacts close, compressor (CPR1) and the outdoor fan motor (ODM) start to maintain the zone temperature to within ±2°F of the sensor setpoint at the sensed location.

If the first stage of cooling can not satisfy the cooling requirement, the RTRM energizes the (K10) relay coil located on the RTRM. When the (K10) relay contacts close, the compressor contactor (CC2) coil is energized provided the low pressure control (LPC2), high pressure control (HPC2) and discharge line thermostat (DLT 2) are closed. When the CC2 contacts close, compressor (CPR2) starts to maintain the zone temperature to within ±2°F of the sensor setpoint at the sensed location.

ReliaTel Control Evaporator Fan Operation

When the fan selection switch is set to the “Auto” position, the RTRM energizes the (K6) relay coil approximately 1 second after energizing the compressor contactor coil (CC1) in the cooling mode.

In the heating mode, the RTRM energizes the (K6) relay coil approximately 45 seconds after gas ignition (gas heat unit) or 1 second before energizing the electric heat contactors (electric heat unit).

Closing the (K6) contacts on the RTRM energizes the indoor fan relay (F) coil to start the indoor fan motor (IDM).

The RTRM de-energizes the fan relay (F) approximately 60 seconds after the cooling requirement has been satisfied to enhance unit efficiency. When the heating cycle is terminated, the indoor fan relay (F) coil is de-energized approximately 90 seconds after the heating requirement is met (gas heat unit) or at the same time as the heater contactors (electric heat unit).

When the fan selection switch is set to the “On” position, the RTRM keeps the indoor fan relay coil

(F) energized for continuous fan motor operation.

When the unit is equipped with the optional clogged filter switch, wired between terminals J7-3 and J7-4 on the ReliaTel Options Module (RTOM), the RTRM produces an analog output if the clogged filter switch (CFS) closes for two minutes after a request for fan operation.

When the system is connected to a remote panel, the “SERVICE” LED will be turned on when this failure occurs.

Low Ambient Operation

During low ambient operation, outside air temperature below 55°F, the RTRM will cycle the compressor and outdoor fan motor “Off” for approximately 3 minutes after every 10 minutes of accumulated compressor run time. The indoor fan motor (IDM) will continue to operate during this evaporator defrost cycle (EDC) and the compressor and outdoor fan will return to normal operation once the defrost cycle has terminated and the compressor “Off” time delay has been satisfied.

RT-SVF21D-EN 11

ReliaTel Control Cooling with an Economizer

The economizer is utilized to control the zone temperature providing the outside air conditions are suitable. Outside air is drawn into the unit through modulating dampers. When cooling is required and economizing is possible, the RTRM sends the cooling request to the unit economizer actuator (ECA) to open the economizer damper.

The RTRM tries to cool the zone utilizing the economizer to slightly below the zone temperature setpoint. If the mixed air sensor (MAS) senses that the mixed air temperature is below 53°F, the damper modulates toward the closed position. If the zone temperature continues to rise above the zone temperature setpoint controlband and the economizer damper is fully open, the RTRM energizes the compressor contactor (CC1).

If the zone temperature continues to rise above the zone temperature setpoint controlband and the economizer damper is fully open, the RTRM energizes the compressor contactor (CC2).

The ECA continues to modulate the economizer damper open/closed to keep the mixed air temperature that is calculated by the RTRM.

If economizing is not possible, the ECA drives the damper to the minimum position setpoint when the indoor fan relay (F) is energized and allows mechanical cooling operation.

When the unit is equipped with the optional fan failure switch, wired between terminals J7-5 and J7-6 on the RTOM, the RTRM will stop all cooling functions and produce an analog output if the fan failure switch (FFS) does not open within 40 seconds after a request for fan operation. When the system is connected to a remote panel, the “SERVICE” LED will flash when this failure occurs.

Economizer Set-Up

Adjusting the minimum position potentiometer located on the unit economizer actuator (ECA) sets the required amount of ventilation air.

Two of the three methods for determining the suitability of the outside air can be selected utilizing the enthalpy potentiometer on the ECA, as described below:

1. Ambient Temperature—Controlling the economizing cycle by sensing the outside air dry bulb temperature. Table 10, p. 12 lists the selectable dry bulb values by potentiometer setting.

2. Reference Enthalpy—Controlling the economizer cycle by sensing the outdoor air humidity.

Table 10 lists the selectable enthalpy values by potentiometer setting. If the outside air enthalpy value is less than the selected value, the economizer is allowed to operate.

3. Comparative Enthalpy—By utilizing a humidity sensor and a temperature sensor in both the return air stream and the outdoor air stream, the unit control processor (RTRM) will be able to establish which conditions are best suited for maintaining the zone temperature, i.e. indoor conditions or outdoor conditions.

The potentiometer located on the ECA is non-functional when both the temperature and humidity sensors are installed.

Table 10.

Potentiometer Setting Dry Bulb Enthalpy

A 73°F(a) (22.8°C)

(a) Factory Setting

27 Btu/lb (63 kJ/kg)

B 70°F (21.1°C) 25 Btu/lb (58 kJ/kg)

C 67°F (19.4°C) 23 Btu/lb (53 kJ/kg)

D 63°F (17.2°C) 22 Btu/lb (51 kJ/kg)

E 55°F (12.8°C) 19 Btu/lb (44 kJ/kg)

12 RT-SVF21D-EN

ReliaTel Control Heating Operation for Cooling Only Units

When the system switch is set to the “Heat” position and the zone temperature falls below the heating setpoint controlband, the RTRM energizes K1 relay coil. When the K1 relay contacts close, located on the RTRM, the first stage electric heat contactor (AH, or AH and CH) is energized.

If the first stage of electric heat can not satisfy the heating requirement, the RTRM energizes K2 relay coil. When the K2 relay contacts close, located on the RTRM, the second stage electric heat contactor (BH, or BH and DH) is energized, if applicable. The RTRM cycles both the first and second stages of heat “On” and “Off” as required to maintain the zone temperature setpoint.

ReliaTel Control Heating Operation for Gas Units

When the system switch is set to the “Heat” position and the zone temperature falls below the heating setpoint controlband, a heat cycle is initiated when the RTRM communicates ignition information to the Ignition module (IGN).

Modulating Gas Heat 5:1

Turndown, in a modulating heat unit, when a call for heat is received, the burner will light at full fire (100 percent). After the burner is lit, the unit controls will monitor the discharge air temperature and modulate the input rate down to match the load.

Ignition Module

Two-Stage (IGN) runs self-check (including verification that the gas valve is de-energized). IGN checks the high-limit switches (TC01 and TC02) for normally closed contacts.

With 115 Vac power supplied to the ignition module (IGN), the hot surface ignition probe (IP) is preheated for approximately 45 seconds.

The gas valve (GV) is energized for approximately 7 seconds for trial for ignition, to ignite the burner. Once the burner is ignited, the hot surface ignition probe (IP) is de-energized by the ignition module (IGN) and functions as the flame sensing device.

If the burner fails to ignite, the ignition module will attempt two retries before locking out. The green LED will indicate a lockout by two fast flashes. An ignition lockout can be reset by:

1. Opening for 3 seconds and closing the main power disconnect switch.

2. By switching the “Mode” switch on the zone sensor to “OFF” and then to the desired position.

3. Allowing the ignition control module to reset automatically after one hour. Refer to “Ignition Control Module Diagnostics,” p. 14 for the LED diagnostic definitions.

When the fan selection switch is set to the “Auto” position, the RTRM energizes the indoor fan relay

(F) coil approximately 30 second after initiating the heating cycle to start the indoor fan motor

(IDM).

The automatic reset high limit (TCO1), located in the bottom right corner of the burner compartment, protects against abnormally high leaving air temperatures.

The automatic reset fan fail limit (TCO2), located in the upper middle section of the indoor fan board, protects against abnormally high heat buildup which could occur because of extended cycling of the high limit (TCO1) or if the indoor fan motor (IDM) fails to operate.

Should TCO2 open, the RTRM will energize the indoor fan relay (F) in an attempt to start the fan motor. The RTRM signals that a heat failure has occurred by flashing the “Heat” LED on the zone sensor.

There is a green LED located in the Ignition Control Module. Table 11 lists the diagnostics and the status of the LED during the various operating states.

RT-SVF21D-EN 13

Ignition Control Module Diagnostics

At any time the control is powered, a green LED indicator light shall be lit using the following signal:

Table 11.

Steady OFF: No Power/Failure/Internal Failure

Steady ON: Normal

Slow Flash Rate: Normal, call for heat (¾ second on, ¼ second off).

Fast Flash Rate: Used for error indication only (¼ second off, ¾ second on).

Error Code Fast Flash Rate:

1 Flash Communication Issue between Refrigeration Module and 3SH control.

2 Flashes System Lockout: Failed to detect or sustain flame.

3 Flashes Not implemented.

4 Flashes High Limit switch protection device open.

5 Flashes Flame sensed and gas valve not energized or flame sensed and no call for heat.

6 Flashes Not implemented.

Note: The pause between groups of fast flashes is approximately two seconds. Additionally, the LED indicator light shall flash for one second at power-up.

14 RT-SVF21D-EN

Pressure Curves

Figure 1. TC/YC180F Cooling cycle pressure curve: #1 circuit, one fan

Figure 2. TC/YC180F Cooling cycle pressure curve: #1 circuit, two fans

100 120 140 160 180

D is ch ar ge P re ss ur e

(P si g)

Suction Pressure (Psig)

(Based on Indoor airflow of 400 CFM/Ton) (One Outdoor Fan)

/5

F

ID

W

B/ D

B

/6

F

ID

W

B/

/7

F

ID

W

B/

F

ID

W

B/

35 F OD Ambient

65 F OD Ambient

55 F OD Ambient

45 F OD Ambient

100 120 140 160 180

D is ch ar ge P re ss ur e

(P si g)

Suction Pressure (Psig)

(Based on Indoor airflow of 400 CFM/Ton) (Two Outdoor Fans)

/5

F

ID

W

B/

F

ID

W

B/

F

ID

W

B/

F

ID

W

B/

120 F OD Ambient

115 F OD Ambient

105 F OD Ambient

95 F OD Ambient

85 F OD Ambient

75 F OD Ambient

55 F OD Ambient

125 F OD Ambient

The highest running limit for discharge pressure

RT-SVF21D-EN 15

Pressure Curves

Figure 3. TC/YC180F Cooling cycle pressure curve: #2 circuit, one fan

Figure 4. TC/YC180F Cooling cycle pressure curve: #2 circuit, two fans

100 120 140 160 180

D is ch ar ge P re ss ur e

(P si g)

Suction Pressure (Psig)

(Based on Indoor airflow of 400 CFM/Ton) (One Outdoor Fan)

/5

F

ID

W

B/

F

ID

W

B/

F

ID

W

B/

F

ID

W

B/

35 F OD Ambient

55 F OD Ambient

45 F OD Ambient

100 120 140 160 180

D is ch ar ge P re ss ur e

(P si g)

Suction Pressure (Psig)

(Based on Indoor airflow of 400 CFM/Ton) (Two Outdoor Fans)

/5

F

ID

W

B/

F

ID

W

B/

F

ID

W

B/

F

ID

W

B/

120 F OD Ambient

115 F OD Ambient

105 F OD Ambient

95 F OD Ambient

85 F OD Ambient

75 F OD Ambient

55 F OD Ambient

125 F OD Ambient

The highest running limit for discharge pressure

16 RT-SVF21D-EN

RT-SVF21D-EN 17

Subcooling Charging Curves

Figure 5. TC/YC180F Subcooling curve (psig): one fan

55 60 65 70 75 80 85 90 95 100 105Li qu id P re ss ur e

Le av in g

O D

C oi l, p si g

Liquid Temperature Leaving OD Coil, °F

Add charge

Remove charge

YC/TC180F Charging Curve (w/ 1 fan)Both Compressors Running System 1 System 2

Figure 6. TC/YC180F Subcooling curve (psig): two fans

50 60 70 80 90 100 110 120 130Li qu id P re ss ur e

Le av in g

O D

C oi l, p si g

Liquid Temperature Leaving OD Coil, °F

Add charge

Remove charge

YC/TC180F Charging Curve (w/ 2 fans) System 1 System 2

Both Compressors Running

Refrigerant Circuit

Figure 7. 15 ton packaged cooling refrigerant circuit

18 RT-SVF21D-EN

The manufacturer optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in creating and sustaining safe, comfortable and energy efficient environments, the manufacturer offers a broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts. For more information, visit www.IRCO.com.

The manufacturer has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

© 2011 Trane All rights reserved

RT-SVF21D-EN 08 Jul 2011

Supersedes RT-SVF21D-EN (25 May 2011) /

RT-SVF43B-EN (31 May 2011)

trane model # TCH 181F300AA