Trane Modular 20 to 35 Tons Installationshandbuch PDF herunterladen (Seite 25)

Maintenance

CXRC-SVX01F-EN 25

and Table 2, p. 7. Calculate additional charge required for

any other units and additional piping to determine the total

system charge.

Use an accurate scale or charging cylinder to determine

the exact charge entering the system. Failure to charge the

system accurately can lead to under or overcharging and

result in unreliable operation.

Liquid Line Charging

Large amounts of refrigerant should be added through the

liquid line service valves. If system is being recharged after

evacuating and dehydrating, determine the approximate

weight of charge required and charge to that level. If

adding less than a full charge, charge to 14 to 20°F

subcooling as measured on the liquid lines at the

condenser coil refrigerant outlets.

Maintenance Periodic Procedures

This section describes specific maintenance procedures

that must be preformed as a part of the normal

maintenance program for this unit.

Periodic Maintenance Checklist

• Inspect optional coil guard for debris that may be

blocking louvers. Clean as required.

• Inspect coil surface for cleanliness. Clean as required.

Refer to “Coil Cleaning” under “Maintenance

Procedures.”

• Manually rotate fan blades to insure proper orifice

clearance. Inspect fan orifices for debris and

obstructions. Clean as required.

Annual Maintenance Checklist

• Perform all monthly maintenance inspections.

• Perform seasonal start up checks.

• Leak test refrigerant circuits. Inspect contacts of fan

motor contactors and relays. Replace all worn

contacts.

• Clean condenser fans. Check fan assemblies for proper

orifice clearance, abnormal end play, and excessive

vibration or noise. Fan motor bearings are

permanently lubricated and do not require lubrication.

• Have a qualified service technician check condenser

fan pressure switches for proper operation (thermostat

controlled unit only).

• Clean and repaint any corroded surface.

Cleaning the Coil

Clean the coil at least once each year or more frequently if

located in a dirty environment, to help maintain proper

unit operating efficiency. High discharge pressures are a

good indication that the coil needs cleaning. Follow the

detergent manufacturer instructions as closely as possible

to avoid potential damage to the coil.

To clean the refrigerant coil, use a soft brush and sprayer,

such as a garden pump up or high pressure type. In

NOTICE:

Compressor Damage!

Do not allow liquid refrigerant to enter the suction line.

Excessive liquid accumulation in the liquid lines could

result in compressor damage.

Table 8. System compressors

Compressors

(a)

(a) Multiple compressors have manifold.

Unit Size Circuit 1 Circuit 2

SXRF/CXRC

20/20 10 10

25/29 15 10

29/29 15 10

30/35 10/10 10

35/35 10/10 10

40/40 10/15 10

50/50 15/15 10

60/60 15/15 15/15

SXRG/CXRC

20/20 10 10

25/29 15 10

32/32 15 15

Notes:

1. All units have dual circuits

2. The quantities shown apply to the CCRC/CIRC air-cooled condenser

Table 9. Charge add (R-410A) - lbs per 10 ft of line

(a)

(a) Amounts listed are for 10 ft of pipe above 25’. Actual requirements will

be in direct proportion to the actual length of piping.

Charge (lbs)

Piping Size (in) Liquid Line Discharge Line

5/8 1.07 -

7/8 2.23 0.31

1 1/8 - 0.53

1 3/8 - 0.80

WARNING

Hazardous Chemicals!

Coil cleaning agents can be either acidic or highly

alkaline and can burn severely if contact with skin

occurs. Handle chemical carefully and avoid contact

with skin. ALWAYS wear Personal Protective Equipment

(PPE) including goggles or face shield, chemical

resistant gloves, boots, apron or suit as required. For

personal safety refer to the cleaning agent

manufacturer’s Materials Safety Data Sheet and follow

all recommended safe handling practices. Failure to

follow all safety instructions could result in death or

serious injury.

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