SECTION 7 – UNIT CONTROLS
FORM QWC3-NM1
ISSUE DATE:11/20/2020
QUANTECH
141
7
ware will cause an error. If this is not the case, the
Flash Card is most likely defective or the IPU and I/O
combo board is bad.
Option 18 – Remote Temperature Reset
R E M O T E T E M P R E S E T
I N P U T XXXXXXXXXXXXXX
Remote Temp Reset input selection is programmable
according to the type of input utilized. The following
options are available:
• DISABLED (default)
• 0.0 – 10.0VDC
• 2.0 – 10.0VVDC
• 0.0 – 20.0mA
• 4.0 – 20.0mA
The options display message for Remote
Temp Reset Input only appears if the Temp
reset Option is enabled under Service
Mode.
Option 19 – Pump Control
Pump Control is utilized to operate the optional on-
board pump kit or to control an external pump through
dry contacts 23 and 24. To use this option, the follow-
ing selection should be made in the Service Mode:
H Y D R O
K I T P U M P S = 1
When HYDRO KIT PUMPS = 1 is displayed, the con-
trols will be closed to run the pumps whenever any one
of the following conditions are true:
• Low Leaving Chilled Liquid Fault
• Any compressor is running
• Daily Schedule is ON and Remote Stop is closed.
Even if one of the above conditions are
true, the pump will not run if the chiller
has been powered up for less than 30 sec-
onds; or if the pump has run in the last
30 seconds to prevent pump overheating.
Hydro Kit pumps = 1 should not be selected on a
QWC3 chiller.
E X T E R N A L
E V A P P U M P
EXTERNAL EVAP PUMP should be selected if an ex-
ternal pump is being controlled with the chiller pump
contacts. The operation will be the same as HYDRO
KIT PUMPS = 1
The following option should not be selected.
H Y D R O
K I T P U M P S = 2
Option 20 – Pump Selection
The displays for this PUMP SELECTION option
should only appear if “HYDRO KIT PUMPS = 2” are
selected under Option 19. Presently, this option should
not be used.
Option 21 – Hot Gas Bypass Type
The Hot Gas Bypass Type must be programmed based
on the option installed. Some chillers will not have hot
gas bypass installed. Others will have it installed on
System #1, System #2 or both systems.
The selected option is only displayed under the OP-
TIONS key and must be programmed under the Ser-
vice Mode.
H O T G A S B Y P A S S T Y P E
N O N E
When programmed for hot gas bypass type None, the
unit will pump down and shutdown the lead system.
H O T G A S B Y P A S S T Y P E
S Y S T E M 1
When programmed for hot gas bypass type System 1,
the unit will operate system 1 hot gas bypass if system
1 is the lead system.
H O T G A S B Y P A S S T Y P E
S Y S T E M 2
When programmed for hot gas bypass type System 2,
the unit will operate system 2 hot gas bypass if system
2 is the lead system.