Russell DLD10M44, DLD Installation Manual

CHARGING and START-UP

The control circuit should be energized 24 hours
before charging and start-up to open the liquid
line solenoid and turn on the crankcase heater.
This will assist the evacuation and dehydration
process and provide additional compressor
protection during the charging and start-up.

Charge refrigerant into a system through a filter­drier in the charging line. This provides further
assurance the refrigerant charge is clean and dry.
The system refrigerant capacity is approximately
80% of the condenser, receiver, and liquid line
capacity. If the condenser volume or refrigerant
capacity is unknown, the system refrigerant
capacity is often calculated at 90% of the receiver
and liquid line capacity. Be cautious if the
calculated charge is exceeded. Weigh the
refrigerant. The actual refrigerant charge should
be less than the calculated capacity. DO

NOT
charge liquid refrigerant into the suction side
of the compressor.

Be sure the compressor discharge valve is open.
The suction valve should be open 2 or 3 turns,
with a valve stem wrench attached for quick
throttle adjusting. High and low pressure gauges

should be attached. Liquid charging is faster.

If R-404A or R-507 is used, liquid charging is
mandatory. R-404A and R-507 refrigerant
cylinders have a dip tube and liquid is charged
with the cylinder upright. Break the final vacuum
by charging liquid refrigerant into the receiver
outlet valve access or the area of liquid line
downstream from the receiver outlet.

Approximately 50 to 60% of the system charge
can usually be injected into the receiver area
before it is necessary to start the compressor for
the system to accept more refrigerant . It may be
necessary to throttle the compressor suction
valve to keep suction pressures reasonable and
prevent tripouts during charging and pull-down. If
it is necessary to add liquid refrigerant to the
suction side, a full control ball valve must be used
in the charging line to slowly meter refrigerant
vapor into the system.

If the condensing temperature is 105°F or
greater, charge the system until the sight glass
just clears, being careful not overcharge. If the
condensing temperature is below 105°F, a part of
the condenser coil can be blocked to raise the
condensing temperature to 105°F. Be careful not

to block the air blast against the compressor.
This procedure satisfies systems with floating
head pressure control. Follow the same
procedure for systems with low-ambient flooded
condenser head pressure control.

With 105°F condensing temperature, charge until
the sight glass just clears. Then accurately weigh
in the additional pounds of refrigerant specified in
the chart on page 19. There is also a charging tag
on the unit. The pounds specified on the tag
supercedes this IOM. This will provide adequate
charge for all ambient operation. The actual
charge should not exceed the calculated systems
capacity. After system charging and room pull­down is complete , test the ability of the system to
successfully pump down. Raise the room
thermostat setting to close the liquid solenoid.
The system must pumpdown and shut off at the
low pressure cutout setting. See Table 13.

Unblock the condenser coil and return the room
thermostat to the desired setting.

The first two to three hours of operation after
start-up is a critical time. Do not just start-up and
walk away. Watch for floodback and adjust the
expansion valve if necessary. Observe system
pressures. Check all fans on the evaporator and
condensing unit to be sure they are operational
and turning the proper direction. Record the
pounds of refrigerant charged into the system.
Check the compressor oil level frequently. On
low temperature systems the fan delay control
may cycle the evaporator fans. To keep the fans
on until the room pulls down, it may be necessary
to jumper the fan delay control.

Check voltage and amperage at the compressor.
Voltage must be within 10% of the specplate
rating. Amperage should be approximately equal
across all three lines. Check the piping for
vibration and add supports if needed. Check
electrical conduit for vibration and route to prevent
contact with tubing.

Use the Start-Up Check List on page 24 to assist
you. Don’t forget to remove the fan delay jumper
if one was used. Also, fully open the suction
valve. After the room has pulled down to design
temperature and held for 24 hours, review the
system guidelines on page 23 and complete a
system service record on page 25.

18

POUNDS OF ADDITIONAL REFRIGERANT CHARGE

TO ADD FOR FLOODED HEAD PRESSURE CONTROL

Table 12

MiniCon 1/2 - 6 HP MiniCon 1/2 - 6 HP D - Series 3 - 22 HP V - Series 20 - 80 HP

Model Lbs. to Model Lbs. to Model Lbs. to Model Lbs. to

MLH Add MLS Add DLD Add VLD Add

H051H22 2.5 S050H22 1.3 3L22 9.5 SINGLE
H050M44 2.2 S050M44 1.1 3L44 8.2 20H22 58

H050L44 2.2 S050L22 1.3 4L22 14.3 20M44 50
H075H22 2.5 S050L44 1.1 4L44 12.3 25H22 78
H075M44 3.2 S075H22 2.5 5H22 14.3 25M44 67

H075L44 3.2 S075L22 2.5 5M44 16.4 27L22 58
H100H22 3.8 S075L44 3.2 5L22 14.3 27L44 50

H100L44 3.2 S100H22 3.8 5L44 12.3 30H22 98
H101M44 4.3 S100M44 4.3 6M44 23.0 30M44 84
H150H22 5.0 S100L22 3.8 6L22 14.3 30L22 58
H150M44 4.3 S100L44 3.2 6L44 12.3 30L44 50

H150L44 4.3 S150H22 5.0 7H22 27.0 35H22 115
H200H22 7.5 S150L44 4.3 7M44 23.0 35M44 99
H201M44 8.6 S200H22 7.5 8H22 27.0 40H22 144

H200L44 6.5 S200M44 6.5 8M44 23.0 40M44 124
H250H22 7.5 S200L22 7.5 8L22 27.0 50H22 156
H300H22 12.4 S200L44 6.5 8L44 23.0 50M44 134
H300M44 10.6 S201L22 7.5 9L22 27.0 60H22 195

H300L44 10.6 S202L22 7.5 9L44 23.0 60M44 168
H400H22 12.4 S250L44 7.1 10H22 44.0
H400M44 10.6 S300H22 8.3 10M44 38.0 PARALLEL
H500H22 16.5 S300M44 7.1 10L22 27.0 17H22 58
H500M44 14.2 S300L22 8.3 10L44 23.0 17M44 50

MLD S300L44 7.1 12H22 44.0 21H22 78

D300L22 12.4 S400H22 12.4 12M44 38.0 21M44 67

D300L44 10.6 S400M22 12.4 12L22 27.0 24H22 98

D400L22 12.4 S400M44 10.6 12L44 23.0 24M44 84

D400L44 10.6 S500H22 16.5 15H22 54.0 31H22 86
D500H22 16.5 S500M22 16.5 15M44 46.0 31M44 74
D500M44 14.2 15L22 44.0 41H22 115

D500L22 12.4 15L44 38.0 41M44 99

D500L44 10.6 22L22 54.0 44L44 74

22L44 46.0 51H22 117

51M44 101

54L44 99

CHARGING STEPS - (See Page 18) 61H22 195

1. Charge as necessary to achieve a clear sight glass, with the air
intake to the condenser blocked, to maintain a minimum 200 psi 61L44 124

head pressure. This will prevent gas from by passing through the 71H22 173
flood valve. DO NOT OVERCHARGE! Just clear the glass. 71M44 149

2. Add the exact amount of refrigerant shown in this table of the
model being charged. This will provide the system the charge it 81H22 198

requires for all weather, flooded, operation.

61M44 168

81H22 231

19