Gas Shortage Warning - Daikin VRV R-407C PLUS Series Service Manual

SiE 00-07

3.16 Gas Shortage Warning

Generates a warning when an excessive gas shortage occurs. This function generates an alarm only, and
does not stop operation.
• In cooling mode
· Lp < 0.10MPa (-21.6˚C)
· Lp ≥ 0.10MPa (-21.6˚C)
• In heating mode
OR
Function R-407C PLUS Series
30 continuous minutes → Outputs gas shortage warning [U0].
→ Cancels gas shortage warning.
SH1 (Evaporator1 outlet
superheat degree) > 20˚C
EV1 = 2000 pls (full open)
SH2 (Evaporator2 outlet
superheat degree) > 20˚C
&
EV2 = 2000 pls (full open)
SH3 (Evaporator3 outlet
superheat degree) > 20˚C
EV3 = 2000 pls (full open)
SH1 (Evaporator1 outlet
superheat degree) ≤ 20˚C
EV1 < 2000 pls (full open)
SH2 (Evaporator2 outlet
superheat degree) ≤ 20˚C
EV2 < 2000 pls (full open)
SH3 (Evaporator3 outlet
superheat degree) ≤ 20˚C
EV3 < 2000 pls (full open)
Left conditions
→ Outputs gas shortage warning [U0].
remain for 60
continuous minutes
→ Cancels gas shortage warning.
Outline of Control (Outdoor Unit)
65