Liebert ITR 3.4 Fan Speed Control Systems

Air-Cooled Models

17

3.4 Fan Speed Control Systems

Fan Speed Control provides an infinite number of speed variations on specially designed, permanent

split-capacitor motors. The control module varies the air quantity passing over the condenser coil by

monitoring refrigerant pressure.

3.4.1 Materials Supplied

1. Built-in pre-wired condenser control box

2. Air-cooled condenser

3. Piping access cover to be reinstalled when piping is complete

4. Bolts (four per leg) 3/8" x 5/8"

5. Terminal block for two-wire, 24-volt interlock connection between unit and condenser

6. Condenser legs, four on one-fan models

Table 5 Equivalent lengths (feet) for various pipe fittings

Copper Pipe

O.D. in.

90 Degree

Elbow Copper

90 Degree

Elbow Cast

45 Degree

Elbow Tee

Gate

Valve

Globe

Valve

Angle

Valve

1/2 0.8 1.3 0.4 2.5 0.26 7.0 4.0

5/8 0.9 1.4 0.5 2.5 0.28 9.5 5.0

3/4 1.0 1.5 0.6 2.5 0.3 12.0 6.5

7/8 1.45 1.8 0.8 3.6 0.36 17.2 9.5

1-1/8 1.85 2.2 1.0 4.6 0.48 22.5 12.0

1-3/8 2.4 2.9 1.3 6.4 0.65 32.0 16.0

1-5/8 2.9 3.5 1.6 7.2 0.72 36.0 19.5

Refrigerant trap = 4 times equivalent length of pipe per this table.

Table 6 Indoor unit refrigerant charge lb (kg) R22 or R407C (per unit serial tag)

Model

R22 R407C

Approximate Charge

lb (kg)

Approximate Charge

lb (kg)

67A/65A 1.5 (0.68) 1.4 (0.6)

Table 7 Line charges - refrigerant per 100 ft (30 m) of Type “L” copper tube

O.D.

R22 R407C

Liquid Line

lb (kg)

Hot Gas Line

lbs (kg)

Liquid Line

lb (kg)

Hot Gas Line

lb (kg)

1/2" 7.3 (3.3) 1.3 (0.6) 6.9 (2.9) -

5/8" 11.7 (5.3) 2.1 (1.0) 11.0 (4.6) 2.2 (0.9)

3/4" 16.6 (7.5) 3.0 (1.4) 15.7 (6.5) 3.1 (1.3)

7/8" 24.4 (11.1) 4.4 (2.0) 23.0 (9.6) 4.5 (1.9)

Table 8 Condenser refrigerant (per serial tag)

Model

R22 R407C

Approximate Charge

lb (kg)

Approximate Charge

lb (kg)

Fan Speed Lee-Temp* Fan Speed Lee-Temp*

083 5 (2.27) 27 (12.3) 8 (3) 25 (12)

104 8 (3.63) 39 (17.7) 9 (4) 37 (17)

* Charge includes the receiver charge.

Contents

Main Page TABLE OF CONTENTS Page FIGURES TABL ES 1.0 I 1.1 System Descriptions 2.0 I 2.1 Room Preparation 2.4 Equipment Handling 2.2 Equipment Inspection 2.3 Location Considerations 2.4.1 Handling With Skid 2.4.2 Removal of Skid Installation 4 Figure 2 Cabinet dimensions Page 6 2.5 Piping Considerations 2.5.1 Drain Line 7 Figure 4 Piping connections for air-cooled units 8 Figure 5 Piping connections for split system fan coil units 9 Figure 6 Piping connections for water/glycol and GLYCOOL units 10 Figure 7 Piping connections for chilled water self-contained units 2.6 Electrical Connections 2.7 Balancing the Air Distribution 2.7.1 Ducted Applications 2.7.2 Plenum Installation 2.8 Checklist for Completed Installation 3.0 AIR-COOLED MODELS 3.1 Condenser Location 3.2 Electrical Connections 3.2.1 Line Voltage 3.2.2 Low Voltage 15 Figure 9 Air-cooled condensers Table 3 Air-cooled condenser statistics 3.3 Refrigerant Piping 3.4 Fan Speed Control Systems 3.4.1 Materials Supplied Dehydration/Leak Test Page 3.4.3 Charging 3.5 Lee-Temp/Flood Back Head Pressure Control Systems 3.5.1 Piping 3.5.2 Materials Supplied Dehydration/Leak Test 3.5.4 Charging SINGLE CIRCUIT SHOWN 4.0 WATER-COOLED MODELS 4.1 Piping Considerations 4.2 Condenser 25 Figure 12 Water-cooled general arrangement 4.3 Water Regulating Valve 4.3.1 Water Regulating Valve Adjustment 4.3.2 Water Regulating Valve Manual Flushing 4.3.3 Testing Valve Function 5.0 GLYCOL/GLYCOOL-COOLED MODELS 5.1 Drycooler Location 5.2 Drycooler Installation 5.3 Electrical Connections 5.3.1 Line Voltage 5.4 Glycol Piping 5.4.1 Expansion Tanks, Fluid Relief Valves and Other Devices 5.5 Filling Instructions 5.5.1 Preparing the System for Filling 5.5.2 Glycol Solutions 5.5.3 Filling the System 32 Figure 14 Drycoolers and pump packages 33 Figure 15 Pump packagesexpansion tank Table 15 Mounting hole dimensional data SL-10065 PG 7B SL-10070 PG 6B Glycol/GLYCOOL-Cooled Models 34 Figure 16 Glycol general arrangement 35 Figure 17 GLYCOOL general arrangement 5.6 Condenser 5.7 Glycol Regulating Valve 5.7.1 Glycol Regulating Valve Adjustment 5.7.2 Testing Valve Function Chilled Water Models 6.0 CHILLED WATER MODELS 6.1 Piping Considerations 2-WAYVALVE 3-WAYVALVE 7.0 SPLIT SYSTEM MODELS 7.1 Location Considerations 7.1.1 Air-Cooled Condensing Units 7.1.2 Water/Glycol-Cooled Condensing Units 7.2 Electrical Connections 7.3 Piping Considerations 7.3.1 Refrigerant Loop Page 41 Figure 19 Refrigerant piping diagram Pitch down 1/2" (13mm) per 10 ft. (3m) Table 23 Equivalent lengths (feet) for various pipe fittings Evaporator Condensing Unit Evaporator Condensing Unit Suction Line Piping Condensing unit below evaporator 7.3.2 Quick Connect Fittings 43 7.4 Outdoor Air-Cooled Condensing Units Figure 20 Outdoor air-cooled condensing unithorizontal air discharge models C Page 45 Figure 21 Outdoor air-cooled condensing unittop air discharge models FOOTPRINT DIMENSIONS Page 47 Figure 22 Electrical field connections, prop fan condensing module SL-11081PG 8A 7.5 Centrifugal Air-Cooled Condensing Units 7.5.1 Installing the Indoor Condensing Unit 7.5.2 Ducting 50 SL-11087 PG 4 Figure 24 Centrifugal air-cooled condensing unit dimensional data 51 Figure 25 Centrifugal air-cooled condensing unit dimensional data (con't.) Split System Models 52 Figure 26 Split systems general arrangement AIR COOLED WATER COOLED GLYCOL COOLED 7.6 Water and Glycol-Cooled Condensing Units 7.6.1 Piping Considerations 7.6.2 Condenser Water Requirements 7.6.3 Regulating Valve Adjustment and Testing 7.6.4 Glycol Systems SL-11087PG 6 55 Figure 28 Water/glycol-cooled condensing unit (con't.) DPN000228_Rev0 WATER/GLYCO L 56 8.0 R407C R 8.1 Calculating Subcooling Example Ensuring The High Availability Of Mission-Critical Data And Applications. Technical Support / Service Locations