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Page 8

# 504,910M

Torque Table

Table 3

Figure 5

Service Valve

Valve Closed

Valve Open

3. Connect gauge to the service port.

4. When testing is completed, replace service port cap.

Tighten finger tight, then an additional 1/6 turn.

To Open Liquid or Suction Line Service Valve:

1. Remove stem cap with an adjustable wrench.

2. Use a service wrench with a hex-head extension to

back the stem out counterclockwise  as far as it will
go. Use a 3/16" hex head extension for liquid line
service valves or a 5/16" extension for suction line
service valves.

3. Replace the stem cap. Tighten finger tight, then

tighten an additional 1/6 turn.

To Close Liquid or Suction Line Service Valve:

1. Remove the stem cap with an adjustable wrench.

2. Use a service wrench with a hex-head extension to

turn the stem clockwise to seat the valve. Tighten it
firmly.

3. Replace the stem cap. Tighten finger tight, then

tighten an additional 1/6 turn.

Suction Line (Ball Type) Service Valve

Suction line (ball type) service valves function the same
way as the other valves; the difference is in the construc-
tion (see Figure 6).

Ball Type Service Valve

(Valve Open)

Figure 6

Use adjustable wrench. To open, rotate stem clockwise

90

. To close, rotate stem counterclockwise 90

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Summary of Contents for SCU12M-024

Page 1: ...on and service performed by unqualified persons can result in property damage personal injury or death WARNING Risk of electrical shock Disconnect all remote power supplies before installing or servic...

Page 2: ...A B C 4 2 0 M 2 1 U C S n i 5 2 4 1 4 2 4 1 4 2 m m 5 3 6 6 1 6 6 1 6 0 3 0 M 2 1 U C S 6 3 0 M 2 1 U C S 2 4 0 M 2 1 U C S 8 4 0 M 2 1 U C S n i 3 3 4 1 2 3 4 1 4 2 m m 8 3 8 9 1 8 6 1 6 0 6 0 M 2 1...

Page 3: ...12M condensing units use R410A which is an ozone friendly HFC refrigerant This unit must be installed with a matching indoor coil and line set SCU12M units are designed for use in expansion valve TXV...

Page 4: ...SCU12M unit Field refrigerant piping consists of liquid and suction lines from the outdoor unit sweat connections to the indoor coil flare or sweat connections Flushing Existing Line Set and Indoor C...

Page 5: ...to flow back into the low side of the sys tem Disconnect the liquid and vapor lines from the existing outdoor unit 2 Remove the existing outdoor unit Set the new R410A unit and follow the brazing conn...

Page 6: ...that all of the R22 vapor is recovered Allow the recovery to pull a vacuum on the system NOTE A single system flush should remove all of the mineral oil from the existing refrigerant lines and indoor...

Page 7: ...using 4 Connect the external equalizer line to the equalizer port on the suction line splice 5 Strap the superheat sensing bulb to the suction header If installing an expansion valve on an indoor coil...

Page 8: ...r Suction Line Service Valve 1 Remove the stem cap with an adjustable wrench 2 Use a service wrench with a hex head extension to turn the stem clockwise to seat the valve Tighten it firmly 3 Replace t...

Page 9: ...s Check all joints for leaks Purge nitrogen and R410A mixture Correct any leaks and recheck IMPORTANT The leak detector must be capable of sensing HFC refrigerant Evacuation Evacuating the system of n...

Page 10: ...pen both manifold valves and start vacuum pump 5 Evacuate the line set and indoor unit to an absolute pressure of 23mm 23 000 microns of mercury approximately 1 in of mercury During the early stages o...

Page 11: ...he same digital thermometer used to check outdoor ambient temperature to check liquid line temperature Verify the unit charge using the approach method The difference between Refrigerant Charge Adjust...

Page 12: ...2 p m e T F e r u s s e r P g i s P 4 7 0 4 1 2 5 7 4 7 1 2 6 7 9 0 2 2 7 7 4 4 2 2 8 7 0 8 2 2 9 7 6 1 3 2 0 8 3 5 3 2 1 8 0 9 3 2 2 8 7 2 4 2 3 8 5 6 4 2 4 8 3 0 5 2 5 8 1 4 5 2 6 8 0 8 5 2 7 8 0 2...

Page 13: ...d installer or service agency At the beginning of each cooling season the system should be checked as follows 1 Clean and inspect condenser coil Coil may be flushed with a water hose Be sure the power...

Page 14: ...Page 14 504 910M 4 Check all wiring for loose connections 5 Check for correct voltage at unit with unit operating 6 Check amp draw on blower motor Unit nameplate _________ Actual _________...

Page 15: ...504 910M Page 15 Figure 7 Connection Diagram Part 534 638W...

Page 16: ...ligation in connection with the warranted product What is NOT Covered 1 Cabinets or cabinet pieces 2 Normal maintenance items such as filters fan belts fuses or other consumable items 3 Damage caused...

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