McQuay WGS130AA: WGS140AW, Руководство по эксплуатации

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OM WGS-5 WGS 130A to 190A 47
20
(54)
Cool LWT Set
Point (44)
4
4-20 mA Reset - Cool Mode
0
Max Reset
(10)
Active
LWT
(
o
F)
Reset Signal (mA)
Reset Type – OAT
This reset can only be used if the unit is configured as air-cooled.
The Active Leaving Water variable is reset based on the outdoor ambient temperature.
Parameters used:
1.
Cool LWT setpoint
2. Max Reset setpoint
3. OAT
Reset is 0 if the outdoor ambient temperature is greater than 75 F. From 75 down to 60 F
the reset varies linearly from no reset to the max reset at 60 F. At ambient temperatures less
than 60 F, reset is equal to the Max Reset setpoint.
75
Cool LWT+Max Reset
(54)
Cool LWT Set-Point
(44)
OAT Reset
60
Max Reset
(10)
OAT (
o
F)
Active
LWT
( o F)
Planned Unit Capacity Overrides
Unit capacity limits can be used to limit total unit capacity in COOL mode only. Multiple
limits may be active at any time, and the lowest limit is always used in the compressor
capacity control.
The estimated unit capacity and the active capacity limit are sent to all circuits for use in
compressor capacity control.
Soft Load
Soft Loading is a configurable function used to slowly ramp up the unit capacity over a
given time. The setpoints that control this function are: