Coil Connections - Carrier 09DK Series Installation, Start-Up And Service Instructions Manual

*Field supplied.
NOTES:
1. Hot gas lines should rise above refrigerant level in condenser
circuit.
2. Trap should be installed on hot gas lines to prevent condenser
oil and refrigerant vapor migration from accumulating on com-
pressor heads during off cycle.
3. Refer to Carrier System Design Manual, part 3 for proper piping
sizes and design.
4. For piping lengths greater than 50 ft (15.2 m), provide support
to liquid and gas lines near the connections to the coil.
Fig. 19 — Typical Piping for 09DK Condenser with a Dual Split System
Procedure for Using the Refrigerant Receiver — See Fig. 20.
During normal operation — Valve A is open and valves B and
C are closed. Receiver is isolated from the system.
For servicing — Valves A and C are closed and valve B is
open. Run unit until all the refrigerant is in the receiver and
then close valve B. Unit is now ready for servicing.
To resume operation — Leave valve A closed and open valves
B and C. Run unit until the stored refrigerant is drawn into the
system. To completely remove the refrigerant from the
receiver, throttle valve B while noting condition of refrigerant
in the liquid line sight glass; also monitor the suction pressure.
A sudden surge of bubbles in the sight glass and a rapid
decrease in suction pressure indicates that all the refrigerant
has been withdrawn from the receiver. Immediately close
valves B and C and then open valve A. The unit should now be
ready for normal operation, with the receiver isolated from the
system. The system should be charged to a clear sight glass
when under normal operation.
COIL CONNECTIONS — See Fig. 3-5, 18, and 19 for the
necessary connections.
Fig. 20 — Piping for Optional Receiver
17
*Field-supplied service valves.
A — Bypass valve
B — Receiver inlet valve
C — Receiver outlet
valve