Quantech QWC4, Installation Operation & Maintenance, Page: 113 / 156

QUANTECH
113
SECTION 6 - OPERATION
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
6
PROGRAM ◄DEF 0.0% LO 0.0% HI 100.0%
HPC SHUTDOWN POSITION = XX.X
With service level password access, navigate to the
following setup parameters and set them properly to
maintain approximately 1 in. coverage above the top of
the condenser subcooler in accordance with the refrig-
erant charge level description in SECTION 7 - MAIN-
TENANCE in this manual.
Default Values
A listing of the low and high limits, and default pro-
grammable values is noted in each display and can be
found in Table 38 on page 113 . The English units are
exact values while the metric units are approximate.
Unit "SETUP MODE" will allow the programming all
of the programmable values that the user should never
change. These will either be programmed at the factory
or by service personnel on the job. This mode may be
entered by pressing the PROGRAM key, entering the
password "4245", and pressing

(ENTER) key.
PROGRAM HPC DIRECTION
◄► XXXXXXXXXXXXXXXXXXXXXXXXXXXX
PROGRAM ◄DEF 0.0% LO 0.0% HI 100.0%
HPC MINIMUM POSITION = XX.X
TABLE 37 - PROGRAM LIMITS
PROGRAM VALUE MODE LOW LIMIT HIGH LIMIT DEFAULT
Chilled Liquid Leaving Temperature Cutout
Water
Cooling
— — 36.0°F
— — 2.2°C
Glycol
Cooling
5.0°F 36.0°F 36.0°F
15.0°C 2.2°C 2.2°C
Motor Current Limit — 30% FLA 100% FLA 100% FLA
Pulldown Motor Current Limit — 30% FLA 100% FLA 100% FLA
Pulldown Motor Current Limit Time — 0 min 255 min 0 min
Motor Temperature Unload —
150.0°F 250.0°F 240.0°F
65.6°C 121.1°C 115.6°C
Sys 1 Condenser Level Control Setpoint — 20.0% 80.0% 33.0%
Sys 2 Condenser Level Control Setpoint
(Not displayed on tandem circuit units)
— 20.0% 80.0% 33.0%
Unit ID Number — 0 7 0
Head Pressure Control — DISABLED ENABLED DISABLED
Head Pressure Setpoint HPC Enabled
25.0 psid
(1.72 bard)
35.0 psid
(2.41 bard)
28 psid
(1.93 bard)
HPC Kp HPC Enabled 0.1 50.0 5.0
HPC Ti HPC Enabled 10 s 1000 s 50 s
HPC Td HPC Enabled 0 s 60 s 0 s
HPC Direction HPC Enabled DIRECT REVERSE DIRECT
HPC Minimum Position HPC Enabled 0.0% 100.0% 0.0%
HPC Shutdown Position HPC Enabled 0.0% 100.0% 0.0%