Hoshizaki IM-240DME Service Manual page 37

Note: The tube ends to be flared should be free Note: The tube ends to be flared should be free
from damage, cracks and burrs and also from damage, cracks and burrs and also
clear of grease or scraps. clear of grease or scraps.
4) Connect the flared copper tubes on to the 4) Connect the flared copper tubes on to the
icemaker and Condenser Unit. The two tubes icemaker and Condenser Unit. The two tubes
have the same diameter so mark them for a have the same diameter so mark them for a
distinction between the gas line and the liquid distinction between the gas line and the liquid
line to prevent misconnection. Apply some line to prevent misconnection. Apply some
clean refrigerant oil of a suitable type to the clean refrigerant oil of a suitable type to the
surfaces of the Flare before connection and surfaces of the Flare before connection and
tightening. Support the Access Valve with a tightening. Support the Access Valve with a
spanner on the flat surfaces when tightening spanner on the flat surfaces when tightening
the nuts. the nuts.
Note: Note:1. Tighten the Flare Nuts to a torque of 38±4 Nm. 1. Tighten the Flare Nuts to a torque of 38±4 Nm.
2. Check the distinction marks on both ends of each copper tubing to make sure the 2. Check the distinction marks on both ends of each copper tubing to make sure the
connections are correct. connections are correct.
3. The tubes should not vibrate. Fix or secure the tubes to prevent stressing. 3. The tubes should not vibrate. Fix or secure the tubes to prevent stressing.
5) Remove the Service Gauge Port Caps from the Access Valves on the icemaker. Evacuate 5) Remove the Service Gauge Port Caps from the Access Valves on the icemaker. Evacuate
the lines through the Gauge Ports for 20 minutes at max. 0.1 torr. Charge both lines with the lines through the Gauge Ports for 20 minutes at max. 0.1 torr. Charge both lines with
vapour refrigerant R404A to a pressure of 1 bar. Add nitrogen to raise the pressure to 15 vapour refrigerant R404A to a pressure of 1 bar. Add nitrogen to raise the pressure to 15
bar. Thoroughly leak test the joints with a leak detector or soap bubbles. bar. Thoroughly leak test the joints with a leak detector or soap bubbles.
6) Evacuate the lines again at max. 0.1 torr. Vapour charge the lines to 1 - 2 bar with refrigerant 6) Evacuate the lines again at max. 0.1 torr. Vapour charge the lines to 1 - 2 bar with refrigerant
R404A. (The actual charge will depend upon the length of tube run.) R404A. (The actual charge will depend upon the length of tube run.)
Base charge up to 10 m: 2400 g Base charge up to 10 m:
Additional charge for each additional meter: Additional charge for each additional meter: 40 g
As the total precharged refrigerant amount in the icemaker and remote condenser is 2400 As the total precharged refrigerant amount in the icemaker and remote condenser is 2400
g, the required refrigerant charge will be: g, the required refrigerant charge will be:
40 g x [length of tube run - 10] m 40 g x [length of tube run - 10] m
Example - If the length of tubing run is 15 m (i.e. distance between the icemaker and Example
Condenser) Condenser)
15 m - 10 m = 5 m 15 m - 10 m = 5 m
Base charge = 2400 g (up to 10 m run) Base charge = 2400 g (up to 10 m run)
Additional charge = 40 g/m Additional charge = 40 g/m
Required refrigerant charge = 40 g x 5 m = Required refrigerant charge = 40 g x 5 m = 200 g
On completion of the refrigerant charge, remove the charging cylinder and charging lines. On completion of the refrigerant charge, remove the charging cylinder and charging lines.
Refit the Port Caps and tighten to a torque of 10±1 Nm. Refit the Port Caps and tighten to a torque of 10±1 Nm.
E1CG4880210 E1CG4880210
2400 g
- If the length of tubing run is 15 m (i.e. distance between the icemaker and
Loosen Loosen
Copper Tube Copper Tube
40 g
200 g
33 33
Tighten Tighten
Access Valve Access Valve
Fig. 19 Fig. 19