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18-AC125D1-1A-EN
STEP 3
- Check the liquid line temperature and
liquid gage pressure to obtain a minimum of 10º
subcooling in heating mode.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
STEP 4
- Add charge if a minimum of 10º sub-
cooling is not obtained with the namplate charge
plus additional charge previously added.
STEP 5
- Return to site for adjustment.
Important:
Return in the spring or summer to
accurately charge the system in the cooling
mode with outdoor ambient
above 55º F
.
20 MIN.
STEP 2
- Stabilize the system by operating for a
minimum of 20 minutes.
At startup, or whenever charge is removed or
added, the system must be operated for a mini-
mum of 20 minutes to stabilize before accurate
measurements can be made.
1. Leak check refrigerant lines. ........................................ [ ]
2. Properly insulate suction lines and fittings. ................... [ ]
3. Properly secure and isolate all refrigerant lines. ........... [ ]
4. Seal passages through masonry.
If mortar is used, prevent mortar from coming
into direct contact with copper tubing. .......................... [ ]
5. Verify that all electrical connections are tight. ............... [ ]
6. Observe outdoor fan during on cycle for clearance
and smooth operation. .................................................. [ ]
Section 15. Checkout Procedures
15.1 Operational And Checkout Procedures
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:
Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units
must be operated and charge adjustments made.
Important:
Perform a final unit inspection to be sure that factory tubing has not shifted during shipment. Adjust tubing if nec-
essary so tubes do not rub against each other when the unit runs. Also be sure that wiring connections are tight and properly
secured.
7. Be sure that indoor coil drain line drains freely. Pour water
into drain pan. ............................................................... [ ]
8. Be sure that supply registers and return grilles are open
and unobstructed. ......................................................... [ ]
9. Be sure that a return air filter is installed. ..................... [ ]
10. Be sure that the correct airflow setting is used.
(Indoor blower motor) ................................................... [ ]
11. Operate complete system in each mode to
ensure safe operation. .................................................. [ ]
Summary of Contents for 4TTX7
Page 25: ...18 AC125D1 1A EN 25 Section 17 Wiring Diagrams 2 3 Ton Units...
Page 26: ...26 18 AC125D1 1A EN PRINTED FROM D157615P04 REV A 2 3 Ton Units...
Page 27: ...18 AC125D1 1A EN 27 4 Ton Units...
Page 28: ...28 18 AC125D1 1A EN 4 Ton Units...
Page 29: ...18 AC125D1 1A EN 29 5 Ton Units...
