Quantech QTC3040T User Manual

Quantech
153
Section 7: Unit controls
Form QTC3-NM1
Issue date: 12/19/2023
7
System trip volts
For individual system high current trip programming
on chillers:
• Add the sum of the compressor and fan RLA’s in
the system
• Multiply the sum by 1.25
• Divide by 225 A
• The resulting voltage is the value that should be
programmed
For example, if fan and compressor RLA’s total 100 A:
5 V x 100 A
x 1.25 =
625 VA
= 2.8 V
225 A 225 A
The programmed value will be 2.8 V. A similar calcula-
tion and programming will be necessary for the other
system in a 2-system chiller.
Unit Trip Volts
For total chiller high current trip programming on 460
VAC chillers:
• Add the sum of all the compressors and fan RLA’s
in the chiller
• Multiply the sum by 1.25
• Divide by 225 A
• The resulting voltage is the value that should be
programmed
For example, if fan and compressor RLA’s total 180 A:
5 V x 180 A
x 1.25 =
1125 VA
= 5.0 V
225 A 225 A
The programmed value will be 5.0 V.
R E M O T E U N I T I D
P R O G R A M M E D = X
When communications is required with a BAS or
OptiView Panel, individual unit IDs are necessary for
communications with specific chillers on a single RS-
485 line. ID 0 - 7 is selectable.
A N T I - V A C S U C T P R E S S
C U T O U T = XXXX PSIG
A N T I - V A C D E L A Y T I M E
= XX S E C
The Fan Control On Pressure is the programmed pres-
sure value that is used to stage the condenser fans on, in
relation to discharge pressure. See Standard condenser
fan control on page 175 in Section 7: Unit controls
and Table 24 on page 177 and Table 25 on page 178.
F A N D I F F E R E N T I A L O F F
P R E S S U R E = X X X P S I G
The Fan Differential Off Pressure is the programmed
differential pressure value that is used to stage the con-
denser fans OFF, in relation to discharge pressure. See
Standard condenser fan control on page 175 in Sec-
tion 8: Unit operation and Table 24 on page 177 and
Table 25 on page 178.
T O T A L N U M B E R O F
C O M P R E S S O R S = 6
The TOTAL NUMBER OF COMPRESSORS is the
total quantity of compressors in the chiller, and deter-
mines the stages of cooling available. Note in Table 18
on page 154, the chiller may have single or dual sys-
tems. Single system units can have 2 or 3 compressors,
while dual system units may have 4 or 6 compressors.
This MUST be programmed correctly to
ensure proper chiller operation.
N U M B E R O F F A N S
P E R S Y S T E M = X
The Number of Fans Per System must be programmed
as needed to match the number of fans on each system.
S Y S X T R I P V O L T S
= X . X V O L T S
U N I T T R I P V O L T S
= X . X V O L T S
Depending on the option, the trip voltage for a
specific system or unit high current trip can be
programmed. It also calibrates the current read-
out under the OPER DATA key. The approximate
programmed value is calculated using the following
formulas.

Quantech QTC3040T Specifications

General

Brand	Quantech
Model	QTC3040T
Category	Chiller
Language	English