Program Key - Quantech QTC4 STYLE A Series Installation Operation & Maintenance
Air-cooled screw liquid chillers with variable speed drive, 150 - 500 tons, 525 - 1750 kw, 2 compressor, 60 hz.
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SECTION 8 - MICROPANEL
Program Key Operation
Various operating parameters are programmable by the
user. These are modified by pressing the PROGRAM
key and then the (ENTER) key to enter Program
Mode. A listing of the limits of the programmable val-
ues is found below. Note that the Imperial units are ex-
act values, while Metric units are only approximate.
The ▲ and ▼ (ARROW) keys are used to scroll
through the user programmable values. A value may be
changed by keying in the new value and pressing the
(ENTER) key to store the new value in memory. The
cursor will be displayed on the screen when a number
key is pressed. The first line of each message will indi-
cate the chiller default (DEF) value), lowest acceptable
programmable value (LO), and highest acceptable pro-
grammable value (HI). The user programmable value
is programmed ON in the second line of the message.
When the PROGRAM key is first pressed, the follow-
ing display will appear indicating the user is in the pro-
gram mode:
PROGRAM MODE XXXX
PRESS ENTER KEY TO CONTINUE
Pressing the (ENTER) key again will display the
first programmable selection.
134
PROGRAM KEY
Suction Pressure Cutout
PROGRAM
SUCTION PRESSURE CUTOUT
The suction pressure cutout is protects the chiller from
a low refrigerant condition. It also helps protect from
a freeze-up due to low or no chilled liquid flow. How-
ever, it is only a back-up for a flow switch and cannot
protect against an evaporator freeze under many condi-
tions. This cutout is programmable and should gener-
ally be programmed for 1.65 barg (24 PSIG) for chilled
water cooling.
The cutout is programmable between 1.65 and 2.48
barg (24.0 and 36.0 PSIG) in the Water Cooling mode
and 0.34 and 2.28 barg (5.0 and 36.0 PSIG) in the Gly-
col Cooling mode. The default value for both modes
will be 1.65 barg (24.0 PSIG).
Low Ambient Cutout
PROGRAM
LOW AMBIENT TEMP CUTOUT
The low ambient temp cutout allows programming the
outdoor temperature at which it is desired to shut down
the chiller to utilize other methods of cooling.
The cutout is programmable between -18.9°C (-2.0°F)
and 10.0°C (50°F) with a -3.9°C (25°F) default.
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
PROGRAM
KEY
LD21850
◄DEF XXXXX LO XXXXX HI XXXXX
= XXX.X PSIG
◄DEF XXXXX LO XXXXX HI XXXXX
= XXX.X °F
QUANTECH
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