Liquid By Pass (Lbp) Control - Toshiba RAS-25S4KVPG-ND Service Manual

Item
28. Smart sensing
Vertical louver position moveable.
29. Liquid by pass
This control purpose is increasing compressor speed
(LBP) control
to improve heating capacity at low ambient condition
with suppressing TD temperature increases by liquid
by-pass (LBP).
(Max compressor speed is difference during liquid
by-pass is actived.)
LBP control outline
Zone
A
B
C
D
Operation flow and applicable data, etc.
Maximum compressor Hz per To zone
RAS-25S4AVPG-ND
93
93
115
115
<LBP operation>
<LBP end operation>
Activated
Cancelled
Cancelled
Activated
RAS-35S4AVPG-ND
91
91
115
115
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Description
1) Operates in heating mode.
2) After compressor ON time 10 minutes.
3) LBP met conditions, The outside
temperature To ≤ -5 °C, and TD ≥ 80 °C.
4) 2 Way valve activated.
5) Compressor Hz changed to maximum
Hz zone.
1) Operate until defrost start.
2) To ≥ -3°C.
3) TD ≤ 70°C and after operation period
limit time 20 minute.
4) Compressor OFF.