WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes.
Line voltage is present at all components when unit is not in operation on units with
Unit Start−Up
IMPORTANT
If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start−up to prevent compressor damage as a result of slugging.
IMPORTANT
During installation, service or maintenance, make sure that copper tubing does not rub against metal edges or other copper tubing. Care should also be taken to ensure that tubing does not become kinked. Use wire ties to se- cure tubing to prevent movement.
Do not secure electrical wires to tubing that carries hot refrigerant gas. Heat from the tubing may melt the wiring insulation causing a short circuit.
UNIT START−UP
1.Rotate fan to check for binding.
2.Inspect all factory− and field−installed wiring for loose connections.
3.Verify that the manifold gauge set is connected as illustrated in figure 19. Use a temperature sensor positioned near the liquid line service port as illustrated in figure 19 which will be required later when using the subcooling method for optimizing the system refrigerant charge.
4.Replace the stem caps and tighten to the value listed in table 1.
5.Check voltage supply at the disconnect switch. The voltage must be within the range listed on the unit’s nameplate. If not, do not start the equipment until you have consulted with the power company and the voltage condition has been corrected.
6.Open both the liquid and vapor line service valves to release the refrigerant charge contained in outdoor unit into the system.
7.Use figure 18 to determine next step in system preparation.
OPEN BOTH VAPOR AND LIQUID SERVICE | ||
| VALVE STEMS TO RELEASE | |
REFRIGERANT FROM OUTDOOR UNIT TO | ||
| SYSTEM. | |
NO | PRESENT | YES |
|
| |
GO TO SERVICE AND WEIGH |
| |
IN REFRIGERANT CHARGE | GO TO OPTIMIZING SYSTEM | |
FOR OUTDOOR UNITS | REFRIGERANT CHARGE ON | |
DELIVERED VOID OF CHARGE | PAGE 25. | |
ON PAGE 23. |
| |
Figure 18. Outdoor Unit Factory Charge
Service and Weigh In Refrigerant for Outdoor Units Delivered Void of Charge
The following procedures are only required if it has been determine that the new outdoor unit is void of charge. Skip to the next section if refrigerant charge is present.
LEAK CHECK, REPAIR AND EVACUATE
If the outdoor unit is void of refrigerant, clean the system using the procedure described below.
1.Leak check system using procedures provided on page 17. Repair any leaks discovered during leak test.
2.Evacuate the system using procedure provided in figure 14.
3.Use nitrogen to break the vacuum and install a new filter drier in the system.
4.Evacuate the system again using procedure in figure 14.
CONNECT MANIFOLD GAUGE SET AND WEIGH−IN CHARGE
After the evacuation procedure, reconnect the manifold gauge set as illustrated in figure 19.
NOTE − Temperature sensor illustrated in figure 19 is not required for initial system weigh in charging.
1.Close manifold gauge set valves and connect the gauge set as exampled in figure 19.
2.Check that fan rotates freely.
Page 23
XP14 SERIES