Quantech QWC3050T-200T - Page 138

FORM QWC3-NM1
ISSUE DATE: 11/20/2020
SECTION 7 – UNIT CONTROLS
QUANTECH
138
S Y S 1 S W I T C H O F F
S Y S 2 S W I T C H O F F
This turns systems 1 and 2 OFF
Turning a system OFF with its system
switch allows a pumpdown to be per-
formed prior to shutdown.
Option 4 – Ambient Control Type
A M B I E N T C O N T R O L
S T A N D A R D
The low ambient cutout is adjustable from 25 °F to 60 °F
(-3.9 °C to 15.6 °C).
or
A M B I E N T C O N T R O L
L O W A M B I E N T
The low ambient cutout is programmable down to 0
°F (-17.8 °C). On water cooled chillers, the low am-
bient control should be selected. The low ambient
cutout should be programmed for 0.00°F.
Option 5 – Local/Remote Control Type
L O C A L / R E M O T E M O D E L
L O C A L
When programmed for LOCAL, a BAS or RCC con-
trol can be used to monitor only. The micro panel will
operate on locally programmed values and ignore all
commands from remote devices, or through the RS-485
inputs. The chiller will communicate and send data to
the remote monitoring devices.
or
L O C A L / R E M O T E M O D E
R E M O T E
This mode should be selected when a BAS or RCC
control is to be used to control the chiller. This mode
will allow the BAS to control the following items: Re-
mote Start/Stop, Cooling Setpoint, Load Limit, and
History Buffer Request. If the unit receives no valid
BAS transmission for 5 minutes, it will revert back to
the locally programmed values.
Option 6 – Unit Control Mode
C O N T R O L M O D E
R E T U R N L I Q U I D
Unit control is based on return chilled liquid temp.
Return Chilled Liquid Control can only be selected on
units that have 4 to 6 compressors (dual system units).
or
C O N T R O L M O D E
L E A V I N G L I Q U I D
Option 7 – Units Type
D I S P L A Y U N I T S
I M P E R I A L
This mode displays system operating values in Impe-
rial units of °F or PSIG.
or
D I S P L A Y U N I T S
S I
This mode displays system operating values in Scien-
tific International Units of °C or barg.
Option 8 – Lead/Lag Type (two system units only)
L E A D / L A G C O N T R O L
M A N U A L S Y S 1 L E A D
SYS 1 selected as lead compressor. SYS 1 lead option
MUST be chosen if Hot Gas Bypass is installed.
or
L E A D / L A G C O N T R O L
M A N U A L S Y S 2 L E A D
SYS 2 selected as lead compressor.
or
L E A D / L A G C O N T R O L
A U T O M A T I C