System control Si18-201
146 Main Functions
3.26.2 Outdoor Unit Motorized Valve Opening Restriction
Outline This function restricts the opening degree of the outdoor unit motorized valves (discharge
bypass motorized valve, gas pipe motorized valve and liquid pipe motorized valve) in order to
quickly stabilize and control the system.
1. EVP opening restriction
There are two types of EVP control: complete closing and completely closing with retightening
EVP's max. opening is set to EVPMAX.
EVP's min. opening is set to EVPMIN.
The motorized valve operates as follows when it is fully closed and at min. opening.
When EVP closes from open condition ("EVP open condition"), EVPMIN is set as the lower
limit. When it closes from EVPMIN, the next motorized valve opening degree is set to 0
pulse ("fully closed condition").
EVP is in the "fully closed condition" from 0 pulse to EVPDP pulses, and the opening degree
increments. In the fully closed condition, EVPDP pulses is set as the upper limit. When it
opens from the EVPDP condition, the next valve opening degree is set to EVPMIN+EVPDP
to achieve "EVP open condition."
2. EVG (gas pipe motorized valve) opening restriction
" Not in capacity control during normal heating
operation
" ELV fully closed during normal cooling operation
(after TEVGARD elapsed 30 sec or more)
" In capacity control during normal heating
operation
" EVL not fully closed during normal cooling
operation
EVPMAX:
Cooling 250 pulses
Heating 450 pulses
EVPMIN + 10
EVPMIN: 32 pulses
Closed condition
(M1055)
0
Outdoor unit valve opening restriction
EVP (discharge bypass motorized valve)
EVGMAX: 70 pulses
EVGMIN + (10)
EVGMIN: 12 pulses
0 pulse
Closed condition
(M1038)
EVGMAX: 100 pulses
EVGMIN: 12 pulses
0 pulse
(M1039)
EVGMAX: 150 pulses
EVGMIN + GDP10
EVGMIN: 12 pulses
Closed condition
(M1040)
EVGMAXC: 450 pulses
EVGMIN + GDP10
EVGMIN: 12 pulses
Closed condition
(M1041)
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