For Air-Cooled Liebert Lee-Temp / Flood Back Head Pressure Control Units Only
NOTICE
Risk of refrigerant contamination. Can cause equipment damage and operational problems.
Refrigerant R-407C is a blend of three components and must be introduced and charged from the cylinder only as a liquid.
Refrigerant R-407C uses a POE (polyolester) lubricant. Do not open the compressor unit piping to the atmosphere for more than 15 minutes. The compressors contain POE oil that is very hygroscopic; it quickly absorbs water from the atmosphere. The longer the compressor piping is open to the atmosphere, the harder it will be to fully evacuate. If left open too long, the POE oil may need to be replaced before achieving the required vacuum level.
POE oils also have a property that makes them act as a solvent in a refrigeration system.
Maintaining system cleanliness is extremely important because the oil will tend to bring any foreign matter back to the compressor. Refer to the ASHRAE refrigeration handbook for general good-practice refrigeration piping.
! WARNING
Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.This unit contains fluids and/or gases under high pressure.
Relieve pressure before working with piping.
Table 38 Receivers and head pressure kits for Liebert Lee-Temp condensers Outdoor Ambient
°F (°C)
Condenser Model 50/60Hz
Condenser Qty
Receiver Part #
Receiver Qty
Head Pressure Kit
Head Pressure
Kit Qty
-30 to 100 (-34 to 38) DCSL415 2 185010G21/G42 2 179711G1 2
-30 to 105 (-34 to 41) DCSL616 2 179713G11/G22 1 179711G2 2
35 to 105 (2 to 41) DCSL616 2 181610G21/G42 2 179711G1 2
1. 120V heater 2. 230V heater
Figure 103 Installation data—Liebert Lee-Temp, one-circuit, four-fan model
Field-supplied main disconnect switch in accordance with local codes or main unit switch ordered as optional equipment factory-installed in condenser control box.
* Liquid line from condenser (Circuit 1)
See
Note 12 * Hot Gas Line From Unit (Circuit 1)
See Note 14
See Note 14
Note 14
Electrical service by others
Hot Gas Line (Circuit 1)
Liquid Line (Circuit 1) See Note 14
Ensure piping stays below electrical box and does not protrude Metal
Clamp
Isolator Liebert Lee-Temp
heater pad electric box
this end (See Page 3)
* Hot Gas Line to Condenser (Circuit 1)
Position elbow to direct relief valve downward
Liquid Return Line to Unit (Circuit 1)
DPN000937 Pg. 1, Rev. 11 4
6
A D
C B
For DCSL616 condenser piping connections, see Figures 107 and 108.
Mounting Instructions
1. Uncrate carton and inspect for damage to condenser and condenser control panel
2. Assemble legs per instructions as shown.
3. Double risers are required when hot gas vertical rise is 15 ft (4.6m) or more. Refer to Liebert XDC user manual for double riser details.
4. Wire according to electrical diagram on inside of condenser control box and in accordance with all local codes.
5. All condenser locations more than 200ft. (61m) of equivalent piping length from Liebert XDC must consult factory for special piping considerations.
6. Field to size refrigerant lines so as not to exceed 2°F (1.1°C) saturation loss for total equivalent length (do not use connection sizes to determine line sizes).
7. Condenser must be installed above or at the same level as the Liebert XDC.
8. Do not run piping or wiring in the path of air flow because it will hamper the system performance.
9. Install field-supplied inverted traps on hot gas lines between condenser and field piping.
10. All other piping field supplied and connected.
11. Inverted traps must be installed to allow proper clearance to fully open condenser control box door and in accordance with local electric codes.
12. Secure Liebert Lee-Temp receiver assembly and each leg to condenser frame using hardware provided.
Receiver can be mounted on either side of the condenser.
13. Liebert Lee-temp Item B is shipped as a pre-piped assembly shipped loose for field installation. Item C is shipped loose for field installation.
14. Fasten liquid and hot gas lines using flat surface clamps with isolators (field-provided). Support field piping separately to avoid coil damage and loss of charge.
15. Relieve pressure at access port. Replace access port fitting with relief valve before charging system.
Factory-Supplied Material
1. Built-in condenser control box. See electrical drawing for details and field wiring.
2. Air-cooled condenser
3. Piping access cover to be reinstalled when piping is completed.
4. Bolts: 4 per leg) 3/8" (9. 5mm); sixteen 5/8" (15.9mm) 5. Terminal block for 2-wire 24V interlock connection
between Liebert XDC and Liebert condenser 6. Condenser Legs: 8 legs for four-fan models 7. Liebert Lee-Temp:
A. Insulated storage receiver - storage receiver one per circuit; 5-foot-long receiver is standard B. Dual head pressure control valve assembly with
integral check valve(s), one per circuit (see Note13)
C. Rotalock valve, one per circuit, field-installed D. Pressure relief valve, one per circuit,
field-installed
E. Liquid level indicator, one per circuit, factory-installed on receiver
Figure 104 Installation data—Liebert Lee-Temp, one-circuit, high ambient six-fan model
Field-supplied main disconnect switch in accordance with local codes or main unit switch ordered as optional equipment factory-installed in condenser control box
* Liquid line from condenser (Circuit 1)
96" (2438mm) receiver shown; some systems use smaller receivers
* Hot gas line from unit (Circuit 1)
Liquid return line to unit
(Circuit 1) Liquid line (Circuit 1) See Note 14
Note 14
DPN000937 Pg. 2, Rev. 11
See Note 14
Isolator Metal
Clamp
Hot gas line (Circuit 1) See Note 14
Electrical service by others Ensure piping stays below electricalbox and does not protrude C
A D Position elbow to direct relief valve downward
* Hot gas line to condenser (Circuit 1) Liebert Lee-Temp Heater
Pad Electric Box this end (See DPN000937, Pg. 3)
(See Page 5 for piping connection details) 5
5 7 B
Factory-Supplied Material
1. Built-in condenser control box. See electric drawing for details and field wiring.
2. Air-cooled condenser
3. Piping access cover to be reinstalled when piping is completed.
4. 3/8"-16 x 3/4" long bolts, 20 total; attaches legs to condenser frame
5. 3/8"-16 x 1-1/4" long bolts, 10 total; attaches legs to receiver; 3/8" nuts, 10 total; 3/8" washers, 20 total 6. Terminal block for 2-wire 24V interlock connection
between Liebert XDC and Liebert condenser 7. Condenser Legs: 5 legs for six-fan models 8. Liebert Lee-Temp:
A. Insulated storage receiver - storage receiver, one per circuit; receiver size varies
B. Dual head pressure control valve assembly with integral check valve(s), one per circuit (see Note14)
C. Rotalock valve, one per circuit, field-installed D. Pressure relief valve, one per circuit,
field-installed
E. Liquid level indicator, one per circuit, factory-installed on receiver
See Figure 108 for details on piping connections.
Mounting Instructions
1. Uncrate carton and inspect for damage to condenser and condenser control panel
2. Assemble legs per instructions as shown.
3. Double risers are required when hot gas vertical rise is 15 ft (4.6m) or more. Refer to Liebert XDC user manual for double riser details.
4. Wire according to electrical diagram on inside of condenser control box and in accordance with all local codes.
5. All condenser locations more than 200ft. (61m) of equivalent piping length from Liebert XDC must consult factory for special piping considerations.
6. Field to size refrigerant lines so as not to exceed 2°F (1.1°C) saturation loss for total equivalent length (do not use connection sizes to determine line sizes).
7. Condenser must be installed above or at the same level as the Liebert XDC.
8. Do not run piping or wiring in the path of air flow because it will hamper the system performance.
9. Install field-supplied inverted traps on hot gas lines between condenser and field piping.
10. All other piping field-supplied and connected.
11. Inverted traps must be installed to allow proper clearance to fully open condenser control box door and in accordance with local electric codes.
12. Secure Liebert Lee-Temp receiver assembly and each leg to condenser frame using hardware provided.
Receiver can be mounted on either side of the condenser.
13. Liebert Lee-temp Item B is shipped as a pre-piped assembly shipped loose for field installation. Item C is shipped loose for field installation.
14. Fasten liquid and hot gas lines using flat surface clamps with isolators (field-provided). Support field piping separately to avoid coil damage and loss of charge.
15. Relieve pressure at access port. Replace access port fitting with relief valve before charging system.
Figure 105 Liebert XDC piping schematic and Liebert Lee-Temp heater pad wiring
Lee-temp Winter System
DPN000937 Pg. 3, Rev. 6
Rotalock Valve Combination Head Pressure Control
& Check Valve
Condenser Control Box Inverted Trap
(By Others)
Pressure Relief Valve
Liquid Level Indicator
Dehydrator Solenoid Valve
Expansion Valve
Sight Glass
Discharge Line
Compressor Hot Gas Bypass Solenoid Valve Hand Shutoff
Valve By Others
Factory Piping Field Piping
Optional Hot Gas Bypass Suction Line Service Valves
Hot Gas Bypass Valve
Sensing Bulb External Equalizer
Liebert XDC Unit (One Circuit Shown)
Air-Cooled Condenser
Heater Pads
Piping Schematic
Lee-Temp Heater Pad Wiring
Separate Continuous Electical Source By Others Volts
Total Watts Per Receiver
Standard 300 Watt (2 Heater Pads) Optional 450 Watt (3 Heater Pads) 1 Phase 50/60 Hz
Hi Limit Thermostat Typical Circuit 1 & 2 Standard Model
With 2 Heater Pads Per Receiver
Circuit 1 & 2 Optional Model With 3 Heater Pads Per Receiver L2
L1 GND
L2
L1 GND
115
200/208/230
DPN000937 Pg. 8, Rev. 11
Heater Pad Wiring Access Separate Continuous
Electrical Source By Others Volts
115
200/208/230 1 Phase 50/60 Hz.
For receiver kits185010g2, G4 and 181610G2, G4.
Two heater pads per receiver - 150 watts each
Hi Limit Thermostat, typical
L2
L1 GND
L2
L1 GND For receiver kits 179713G1, G3. Three heater pads per receiver - 150 watts each
Figure 106 General arrangement air-cooled Liebert XDC Liebert Lee-Temp Control
Table 39 Recommended refrigerant line sizes, DX R-407C, OD copper Liebert XDC 160
Equivalent Length, ft., (m)
* Hot Gas Line,
in. Liquid Line, in.
50 (15) 1-1/8 7/8
100 (30) 1-1/8 1-1/8
150 (45) 1-3/8 1-1/8
200 (60) 1-3/8 1-1/8
* Double risers are required when hot gas vertical rise is 15ft. (4.6m) or more.
Source: DPN000937, Pg. 3, Rev. 11
* Double Risers every 15ft (4.6m) of rise on hot gas line only; maximum rise not to exceed 60ft (18.3m)
Condenser Coil
Additional Piping Assembly **
Hot Gas/Discharge Liquid/Return
Liq uid
Re tur n F ro m Co nd en se r
Standard Piping Assembly **
Rotalock Valve **
1/4" (6.4mm) Pressure Relief Valve
Liebert Lee-Temp Receiver Check Valve Head Pressure
Control with Integral Check Valve
* Inverted Trap on discharge line to extend above base of coil by a minimum of
7-1/2" (190mm)
DPN000937 Pg. 3, Rev. 11
** Components supplied by Liebert;
must be field-installed.
* Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance.
Single XDC Circuit Shown
Field-Supplied Piping Factory-Supplied Piping
Sight Glass
Some Models Have
Two Sight Glasses
Figure 107 DCSL616 piping connections—two refrigerant circuits connected for parallel flow
Table 40 Recommended refrigerant line sizes for DCSL616 Liebert XDC 160
Equivalent Length, ft., (m)
* Hot Gas Line,
in. Liquid Line, in.
50 (15) 1-1/8 7/8
100 (30) 1-1/8 1-1/8
150 (45) 1-3/8 1-1/8
200 (60) 1-3/8 1-1/8
* Double risers are required when hot gas vertical rise is 15 feet or more.
Source: DPN000937, Pg. 4, Rev. 11
* Double Risers every 15 ft (4.6m) of rise on hot gas line only;
maximum rise not to exceed 60ft. (18.3m)
Condenser Coil (Circuit 1) Condenser Coil (Circuit 2)
Hot Gas/Discharge Liquid/Return
Liq uid
Re tur n F ro m Co nd en se r
** Standard Piping Assembly
Rotalock Valve **
** 1/4" (6.4mm) Pressure Relief
Valve Sight Glass
Some Models Have 2 Sight Glasses
LiebertLee-Temp Receiver
Check Valve Head Pressure
Control with Integral Check Valve
* Inverted Trap on discharge line to extend above base of coil by a minimum of 7-1/2" (190mm)
Additional Piping Assembly **
DPN000937 Pg. 4, Rev. 11
* * Components supplied by Liebert;
must be field-installed.
* Components are not supplied by Liebert but are recommended for proper circuit operation and maintenance.
Single XDC Circuit Shown
Field-Supplied Piping
Factory-Supplied Piping
Figure 108 DCSL616 piping connections—two refrigerant circuits connected for parallel refrigerant flow
DPN000937 Pg. 5, Rev. 11
Connect the two refrigerant coils for parallel refrigerant flow using field-supplied piping.
Refrigerant lines are to be routed and secured
to prevent excessive vibration and stress at the connections.
Liquid Line (Circuit 1) Hot Gas Line (Circuit 1)
Refer to Figure 104 for mounting instructions.
6.4.1 Air-Cooled Condenser with Liebert Lee-Temp “Flooded Condenser” Head Pressure Control System—R-407C (DX) Circuit
The Liebert Lee-Temp system consists of a modulating type head pressure control valves and insulated receivers with heater pads to ensure operation at ambient temperatures as low as -30°F (-34.4°C).
Liebert Lee-Temp Piping
Two discharge lines and two liquid lines must be field-installed between the indoor unit and the outdoor condenser. See Figures 103 and106 for details.
Liebert Lee-Temp Control Materials Supplied
• Built-in, pre-wired condenser control box
• Air-cooled condenser
• Piping access cover to be reinstalled when piping is complete
• Bolts—four per leg (3/8" x 5/8")
• Terminal block for two-wire, 24V interlock connection between unit and condenser
• Condensate legs—four with one-fan, six on two-and three-fan models and eight on four-fan models
• Bolts—used to mount receiver (3/8" x 1-1/4")
• Liebert Lee-Temp system:
• Insulated storage receiver—one per circuit
• Head pressure control assembly (head pressure valves and check valves) - one per circuit
• Service valve—one per circuit
• Pressure relief valve—one per circuit
• Liquid level sight glasses NOTE
Liebert Lee-Temp heater pads require a separate, continuous electrical source. See nameplate on unit for proper voltage.