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Commissioning, Operation and Decommissioning

AH-SVX008C-EN

37 

Programming the Thermostat

A-Tech Controller

The A-Tech controller is a programmable thermostat that 
provides:

•

single- and dual-stage cooling control

•

on/auto/intermittent/off modes of operation

•

continuous/auto/residual fan

•

day/time clock

•

service reminders

•

language and °C/°F display preference

•

security features

•

temperature setpoint override

Note:

See the Robertshaw C9701i2 and C9725i2 User's 
Manual that accompanied your unit for 
programming instructions.

Microprocessor Controller

If the unit employs a controller, the controller was factory 
programmed based on the model of the A/C unit and the 
optional features selected. Most applications require no 
field start-up or program adjustment beyond setting the 
current date and time. Separate operating instructions for 
the controller have been sent with your unit, including 
each feature's factory "default" setting and the available 
adjustment range, if applicable.

Decommissioning the Unit

Personnel performing the decommissioning must be 
completely familiar with the unit before starting. Best 
practice requires all refrigerants be recovered safely. Prior 
to recovery, an oil and refrigerant sample should be taken 
in case analysis is required prior to re-use of the reclaimed 
refrigerant. Electrical power must be available before 
decommissioning is started.

Follow these decommissioning guidelines:

1. Become familiar with the equipment and its operation.

2. Isolate the system electrically.

3. Before attempting the procedure ensure that:

•

Mechanical handling equipment is available, if 
required, for handling refrigerant cylinders

•

All required personal protective equipment is 
available and used correctly

•

The recovery process is supervised at all times by 
competent personnel

•

Recovery equipment and cylinders conform to the 
appropriate standards

4. Pump down the refrigerant system, if possible.

5. If a vacuum is not possible, make a manifold so that 

refrigerant can be removed from various parts of the 
system.

6. Place the cylinder receiving the refrigerant on the scale 

before starting recovery.

7. Start the recovery machine and operate in accordance 

with manufacturer's instructions.

8. Do not overfill cylinders (They should contain no more 

than 80% volume liquid charge).

9. Do not exceed the maximum working pressure of the 

cylinder, even temporarily.

10. When the cylinders have been filled correctly and the 

process completed, make sure that the cylinders and 
the equipment are removed from site promptly and all 
isolation valves on the equipment are closed off.

11. Recovered refrigerant must not be charged into an- 

other refrigeration system unless it has been cleaned 
and checked.

Recovering Refrigerant

When removing refrigerant from a system, either for 
servicing or decommissioning, best practice is to remove 
all refrigerants safely. Use the following recommended 
guidelines:

•

When transferring refrigerant into cylinders, ensure 
that only appropriate refrigerant recovery cylinders 
are employed. Ensure that the correct number of 
cylinders for holding the total system charge are 
available and that all cylinders to be used are 
designated for the recovered refrigerant and labelled 
for that refrigerant (i.e., special cylinders for the 
recovery of refrigerant). Cylinders must be complete 
with pressure relief valve and associated shut-off 
valves in good working order. Empty recovery 
cylinders must be evacuated and, if possible, cooled 
before recovery occurs

•

Recovery equipment must be in good working order 
with a set of instructions concerning the equipment at 
hand, and the equipment must be suitable for 
recovering flammable refrigerants. In addition, a set of 
calibrated weighing scales must be available and in 
good working order. Hoses must be complete and in 
good condition with leak-free disconnect couplings. 
Before using the recovery machine, check that it is in 
satisfactory working order, has been properly 
maintained and that any associated electrical 
components are sealed to prevent ignition in theevent 
of a refrigerant release. Consult manufacturer ifin 
doubt.

•

Recovered refrigerant must be returned to the 
refrigerant supplier in the correct recovery cylinder, 
and the relevant Waste Transfer Note arranged. Do not 
mix refrigerants in recovery units and especially not in 
cylinders.

Содержание CeilAir CW

Страница 1: ... 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 a...

Страница 2: ...ent 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 Proper Field Wiring and Grounding Required Failure to follow code could result in death or serious injury All field wiring MUST be performed by qualified perso...

Страница 3: ...low the company s Environmental Health and Safety EHS policies when performing work such as hot work electrical fall protection lockout tagout refrigerant handling etc Where local regulations are more stringent than these policies those regulations supersede these policies Non Trane personnel should always follow local regulations Introduction AH SVX008C EN 3 Copyright This document and the inform...

Страница 4: ...rmostat 22 Air Cooled Split Systems 22 Optional Equipment 26 System Charging Procedures 27 Water Glycol Systems 27 Pump 27 DX Unit Charging Requirements 27 Refrigerant Characteristics 30 Pressure Temperature Settings 30 Saturated Refrigerant Pressure Tables 31 System Settings and Adjustments 32 Low High Pressure Limit Switch 32 Head Pressure Controls Air Cooled Systems 32 Blower Adjustment 33 Comm...

Страница 5: ...Table of Contents AH SVX008C EN 5 spection 46 Technical Support 46 Obtaining Warranty Parts 46 Obtaining Spare Replacement Parts 47 Appendix A TR OHS Preventive Maintenance Inspection Checklist 48 ...

Страница 6: ...C Chilled Water System G Glycol Cooled W Water Cooled Digit 11 12 Options AWS Alternate Water Source FC Free Cooling LP Low Profile Configuration SF Same Face Air Pattern SP Special Configuration About Digits Model numbers are comprised of digits Each digit or set of digits defines the product model Example using model TR OHS 040 H G FC Overhead System OHS digits 1 2 3 4 5 40 000 MBH Capacity digi...

Страница 7: ...net configuration is available in a 2 ft x 4 ft frame for units ranging from 12 000 to 40 000 Btu h spot cooler or ducted or a larger frame for units ranging from 48 000 to 120 000 Btu h ducted only For ducted units there are three configurations of airflow patterns dependent on unit 90o right angle straight through and in out same face see Figure 9 p 14 Refer to the installation drawing provided ...

Страница 8: ...the electrical drawing supplied with your unit for details specific to your system Optional Equipment Humidistat Dehumidistat As an option for systems employing an A Tech 1 1 or A Tech 1 2 thermostat a room mounted humidistat and or dehumidistat can be shipped loose for field installation Each device has an adjustment dial on the front where the operator selects the desired setpoint If an optional...

Страница 9: ...ir temperature indicative of a fire The system shuts down either through the controller or in an A Tech system via connection to the TR OHS remote stop start terminals Following activation the firestat must be manually reset using the reset button on the firestat before restarting the unit Water Detector As an option Trane offers spot type or strip cable type water detectors In units equipped with...

Страница 10: ...oint to increase above the prevailing ambient conditions The indoor units inlet fluid temperature sensor monitors the fluid temperature and deactivates the free cooling mode once the fluid temperature increases above the user adjustable enable setpoint The compressor system becomes the primary cooling source and will activate if the return air temperature increases above the setpoint AWS Operation...

Страница 11: ...ssor cut out setpoint temperature is reached provided the minimum run time expires Ifthechilledwaterinlettemperaturerisesabove55oF AWS cooling turns off the control valve closes When the DX cooling stage enable temperature setpoint is reached the compressor turns on and becomes the primary source of cooling In the event of loss of water flow during AWS operation the AWS control valve is closed and...

Страница 12: ...er to the National Electrical Code and local codes To minimize the effects of the environment surrounding the conditioned space certain steps must be taken This is especially true for critical precision room preparation computer rooms labs requiring close tolerance control of temperature and humidity The conditioned space should be well insulated and include a vapor barrier The installer should en...

Страница 13: ... a secure location where the unit cannot be tampered with and the power service switch cannot be inadvertently turned off Locate the remote condenser condensing unit where the fan is not likely to draw dirt and debris into the coil fins There should be at least one equipment width of clearance around the condenser to ensure adequate airflow to the coil Secure the condenser condensing unit so the s...

Страница 14: ...If using the supplied anchors drill two 3 16 in holes and tap in the wall anchors If only the screws are being used drill two 3 32 in holes 4 Fasten the base to the wall using the supplied screws 5 Connect wiring between the thermostat and equipment See the A Tech wiring instructions in Section A Tech1 1ProgrammableThermostat p 22 and A Tech 1 2 Programmable Thermostat p 22 6 Reinstall thermostat ...

Страница 15: ...ockable handle to lock power out during maintenance periods The switch is typically mounted to the A C cabinet however it may be shipped loose for field installation The case has a top keyhole mounting slot and two holes in each bottom corner for mounting The hardware for mounting the switch is field supplied Select suitable fasteners for the intended mounting surface The non fused service switch ...

Страница 16: ...ear the common return air grille Mount the humidistat and dehumidistat at least 18 in froman outside wall and approximately 5 ft above the floor Controlsmay be installed either ona flushswitch box or on a surface switch box Followthe steps below for mounting Instructions for wiring the unit are provided in Section Humidistat Dehumidistat p 26 1 Pull dial knob off loosen screw located at bottom of ...

Страница 17: ... rivets or self tapping screws Piping Connections Refrigerant Self Contained Systems No refrigeration connections are required for self contained air water or glycol cooled systems Models TR OHS 012 040 AS TR OHS 012 120 C and TR OHS 012 120 W G Split Systems Split air cooled systems will require field refrigeration piping All split systems are shipped with a dry nitrogen charge of 100 psig System...

Страница 18: ...R407C refrigerant Model No Total Btu h Capacity Compressor to Condenser O D in 50 ft or less 100 ft or less 150 ft or less 012 12 000 1 2 5 8 5 8 018 18 000 1 2 5 8 5 8 024 24 000 5 8 5 8 3 4 032 32 000 5 8 3 4 3 4 040 40 000 3 4 3 4 7 8 048 48 000 3 4 7 8 7 8 048D 48 000 5 8 5 8 3 4 060 60 000 3 4 7 8 1 1 8 072D 72 000 5 8 3 4 3 4 084D 84 000 3 4 7 8 7 8 120D 120 000 3 4 7 8 1 1 8 Table 4 Recomme...

Страница 19: ...suction lines must be insulated to prevent condensation from forming on the pipes Refer to the Recommended Suction Line and Recommended Liquid Line sizing tables Chilled Water Water Glycol and Hot Water Reheat Piping The piping connections for water glycol chilled water and systems with hot water reheat are sweat connections Pipe sizes may not necessarily be the same as the unit connection Piping ...

Страница 20: ...tionsuppliedbythefactory Refertotheinstallation drawing provided with your unit for the size and location of the connection The humidifier requires normal tap water as the water supply If the supply water is high in particulates an external filter may be needed NOTICE Humidifier Damage Do not use demineralized water in the humidifier Note Refer to the humidifier operator s manual supplied with the...

Страница 21: ...nit can operate with a tolerance of 5 if the following change is performed The control transformers within the system must have the primary wire connected to its respective 240V tap instead of the 208V tap Single Phase Units 277V Single phase units require that the hot leg of power be connected to terminal L1 and the neutral wire to terminal L2 of the main power distribution block Three Phase Unit...

Страница 22: ... to the control terminal board located within the unit electric box The thermostat provides a terminal strip with box type lugs for wire connections See Figure 18 p 23 and refer to the supplied electrical drawing for proper wire terminations Figure 16 A Tech 1 1 top and 1 2 bottom controller wiring contacts Air Cooled Split Systems The system interconnecting field wiring illustrations in Figure 19...

Страница 23: ...Figure 17 A Tech 1 1 control wiring W1 Y1 Figure 18 A Tech 1 2 control wiring A TECH 1 2 Installation AH SVX008C EN 23 ...

Страница 24: ...URE ARE NOTIONAL SEE UNIT ELECTRICAL DRAWING FOR ACTUAL NUMBER AND TERMINAL POINTS OF CONDUCTORS Figure 20 Interconnection field wiring remote condensing unit SEE NOTE 3 REMOTE CONDENSING UNIT REMOTE TEMPERATURE HUMIDITY SENSOR OPTIONAL SEE NOTE 3 3 CONDUCTOR SHIELDED CABLE E CONTROLLER DISPLAY E DISPLAY PLUGS DIRECTLY INTO THE CONTROLLER INSIDE THE ELECTRIC BOX 6 CNDCT PHONE TYPE NON SHIELDED CAB...

Страница 25: ...OR COUNTS IN FIGURE ARE NOTIONAL SEE UNIT ELECTRICAL DRAWING FOR ACTUAL NUMBER AND TERMINAL POINTS OF CONDUCTORS Figure 22 Interconnection field wiring glycol systems SEE NOTE 3 REMOTE TEMPERATURE HUMIDITY SENSOR OPTIONAL SEE NOTE 3 3 CONDUCTOR SHIELDED CABLE E CONTROLLER DISPLAY E DISPLAY PLUGS DIRECTLY INTO THE CONTROLLER INSIDE THE ELECTRIC BOX 6 CNDCT PHONE TYPE NON SHIELDED CABLE THERMOSTAT C...

Страница 26: ...trical drawing s supplied with your unit to determine the exact number of field wires and proper wireterminations requiredspecifically foryour system Remote Shut Down The unit provides an interface that allows for remote shut down A normally closed switch rated at 5 amperes at 24VAC is required for this purpose Two conductors from the normally closed switch must be connected to the control termina...

Страница 27: ...foaming due to air in the system Pump If a pump is used ensure the system is filled before turning the pump on If the pump is not self priming it is important that there is pressure at the suction inlet NOTICE Pump Damage Do not run the pump when dry If the pump has no pressure on the discharge side leave the discharge valve partially shut to create a back pressure in the pump so that liquid can b...

Страница 28: ...ed by adding the amount of refrigerant required for the condenser see the condenser manual provided separately plus the refrigerant piping Table 6 p 28 plus the refrigerant for the A C unit Table 7 p 28 The values in Table 8 p 31 are the estimated weights for the compressor circuit In the case of dual compressor systems the values are estimated weights for each compressor circuit The values shown ...

Страница 29: ...he system to stand for two hours with the dry nitrogen charge This gives time for the nitrogen molecules to disperse in the system absorbing moisture 6 After two hours release the pressure Then turn on the vacuum pump and evacuate the system a second time down to 150 microns or less Close the vacuum pump isolation valve and pressurize the system again with dry nitrogen and allow the system to stan...

Страница 30: ...e suction side to achieve the sub cooling temperature 6 If the unit has hot gas reheat optional the previous steps are still followed except the hot gas reheat valve must be open to allow refrigerant to flow into the reheat coil to obtain the proper amount of refrigerant charge This can be done using the system controller to enable a call for dehumidification lower the humidity setpoint This proce...

Страница 31: ...llation AH SVX008C EN 31 Saturated Refrigerant Pressure Tables The following table shows the refrigerant pressures are provided for reference for R407C refrigerant Table 9 Refrigerant vapor tables R407C Refrigerant Temp F Pressure psig Saturated Evaporating Temperature 20 37 9 Dew Point Saturated Vapor 22 40 1 24 42 3 26 44 7 28 47 1 30 49 6 32 52 1 34 54 8 36 57 5 38 60 3 40 63 2 42 66 1 44 69 2 ...

Страница 32: ...an one fan on the condenser the remaining motors cycle on and off based on pressure Intelligent Control Condenser Model SCS EC Only 20 F Used for outdoor installations where ambient condenser air inlet temperaturesmay fallto 20 F intelligentpressure control is designed to maintain discharge pressure by constantly modulating condenser fan speed SCS outdoor condensers are equipped with highly effici...

Страница 33: ...ure or increase the water glycol flow A directional arrow is stamped on the metal housing of the valve stem 350 psig and 450 psig High Pressure Valves Adjustment is made by turning the round holed knob counter clockwise inside the valve s metal housing to increase condensing pressure or decrease water glycol flow and clockwise to decrease the condensing temperature or increase the water glycol flo...

Страница 34: ...vels to the condenser No adjustment to the valve is necessary Hot Gas Bypass Optional The two most common systems provided by Trane for hot gas bypass are snap acting and full floating described below Snap Acting Hot Gas Bypass The snap acting hot gas bypass system provides for some modulated capacity control and freeze protection The hot gas bypass system includes a discharge bypass valve that al...

Страница 35: ...ot exceed 20 F superheat Exceeding this temperature may cause failure of the compressor The normal control setting for the quench valve is 20 F superheat when there is no call for cooling The valve is factory set and no adjustment should be necessary If adjustment is required remove adjustment cap from the valve Turn the adjusting stem clockwise to increase superheat and counterclockwise to decrea...

Страница 36: ...e discharge air temperature 6 Test humidifier operation by creating a demand for humidification Use an amp meter to determine the current draw of the humidifier Visually check for vapor leaving the steam head or feel if the cylinder is warm to verify the humidifier is operational In all cases one to six hours might be required to see a desired level or rise in humidity in the conditioned space Onc...

Страница 37: ...he refrigerant on the scale before starting recovery 7 Start the recovery machine and operate in accordance with manufacturer s instructions 8 Do not overfill cylinders They should contain no more than 80 volume liquid charge 9 Do not exceed the maximum working pressure of the cylinder even temporarily 10 When the cylinders have been filled correctly and the process completed make sure that the cy...

Страница 38: ...arried out prior to returning the compressor to the suppliers Only electric heating of the compressor body can be employed to accelerate this process When oil is drained from a system it must be carried out safely Labeling Decommissioned Equipment Equipment must be labelled stating that it has been de commissioned and emptied of refrigerant The label must be dated and signed Ensure that there are ...

Страница 39: ...tion repairs Always recover all refrigerant prior to any system repairs Failure to do so may result in system over pressurization and rupture Follow the guidelines in Recovering Refrigerant p 37 Turn off power to the unit at the service disconnect switch unless you are performing tests that require power With power and controls energized the unit could begin operating automatically at any time Haz...

Страница 40: ... condensate pump should be inspected semi annually and cleaned Ensure that the float works freely Wipe the float with a wet cloth and detergent to remove dirt Clean the tank bottom Check that the discharge line is open and water can pass through it freely Humidifier The optional humidifier s steam cylinder has a limited lifetime and must be replaced periodically Because water conditions and humidi...

Страница 41: ...ails to Start a Power failure Check main voltage power source input cable b Control transformer circuit breaker tripped Check for short circuit or ground fault if none reset circuit breaker c Defective contactor Repair or replace Repair or replace d Thermal overload tripped Reset overload and check amperage of motor Compare to setting on overload and adjust to FLA All direct drive motors are inter...

Страница 42: ...er strainer feels cold Replace with new drier strainer d Reduced airflow Check belt tension filters and clear evaporator coil of debris Compressor Short Cycles a Low line voltage causing compressor to overheat Check power source for cause of low line voltage b Dirty or iced over evaporator coil Defrost and or clean coil c Reduced airflow when applicable Check filter and belt tension d Lack of refr...

Страница 43: ...electrical connections d Humidifier fuses are blown Check for overcurrent by the humidifier electrodes Drain water from tank and refill Replace fuses e Relative humidity is above setpoint Adjust humidistat setpoint f Yellow status LED is flashing Consult humidifier manual g Water conductivity is too low Add a teaspoon of table salt to the water through the top of the cylinder Typically only requir...

Страница 44: ... Refrigerant Piping When replacing components within the cabinet of the unit the following consumable materials are recommended 1 Use Sil Fos alloy for copper to copper piping discharge or suction line repairs 2 Use silver solder Stay Silv 45 and flux on copper to brass or copper to steel repairs General Common Repairs Component Replacement Compressor Failure The compressor is the most important c...

Страница 45: ...aned using the suction line filter drier method 2 If your unit is equipped with an E controller turn the A C unit off by pressing and holding the Enter key 3 Turnoffpowertotheunitatthemainpowerdisconnect switch 4 Remove the burned out compressor and install the new compressor 5 Install a suction line filter drier designed for acid removal 6 Remove the liquid line drier and install the appropriate ...

Страница 46: ... the filter is accessed through an access panel labeled FILTER ACCESS Remove the access panel and old filter Ensuring directional airflow arrowson filter arecorrect insert the new filter and replace the access panel Product Support Product Support provides aftermarket technical and field support warranty authorization and part sales to contractors and end users Factory authorized services are avai...

Страница 47: ...art s is conducted and if the part is found to have a manufacturing defect a credit will be issued When returning defective part s complete the Return Material Authorization Tag and the address label provided with the replacement part For prompt processing please affix the RMA in a prominent place on the external packaging of the returned part Obtaining Spare Replacement Parts Maintaining a recomm...

Страница 48: ...ass Fail N A Inspect low voltage connections Pass Fail N A Inspect relays and contactors for serviceability i e pitted contacts weak coils Pass Fail N A Note The following should be performed by Trained Service Personnel only Table 14 Record supply voltage L1 GND L2 GND L3 GND L1 L2 L2 L3 L1 L3 Table 15 Unit operation Verify Control Device Operation Pass Fail N A Verify Customer Setpoints Pass Fai...

Страница 49: ... L2 L3 Compressor 2 L1 L2 L3 Table 20 Record compressor amp draw Circuit 1 Discharge Pressure Suction Pressure Discharge Line Temp Suction Line Temp Liquid Line Temp Subcooling Superheat EW LWT Circuit 1 Discharge Pressure Suction Pressure Discharge Line Temp Suction Line Temp Liquid Line Temp Subcooling Superheat EW LWT Table 21 Check humidifier operation Check electrical connections Yes No N A C...

Страница 50: ...er overloads for damage Yes No N A Table 24 Record heater s amp draw Heater 1 L1 L2 L3 Heater 2 L1 L2 L3 Heater 3 L1 L2 L3 Heater 4 L1 L2 L3 Table 25 Site recommendations 1 2 3 4 5 Table 26 Final verification Technician Signature Date QA Verification Date Appendix A TR OHS Preventive Maintenance Inspection Checklist 50 AH SVX008C EN ...

Страница 51: ......

Страница 52: ...e are committed to using environmentally conscious print practices Trane by Trane Technologies NYSE TT a global climate innovator creates comfortable energy efficient indoor environments for commercial and residential applications For more information please visit trane com or tranetechnologies com AH SVX008C EN 30 Dec 2020 Supersedes AH SVX008B EN Apr 2020 ...

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