Quantech QTC3150THE User Manual

QUANTECH
132
FORM QTC3-NM1
ISSUE DATE 08/03/2022
SECTION 7 – UNIT CONTROLS
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:
5V 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:
5V 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 Op-
tiView Panel, individual unit IDs are necessary for
communications with specific chillers on a single RS-
485 line. ID 0 - 7 is selectable.
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
condenser fans OFF, in relation to discharge pressure.
See Standard Condenser Fan Control on page 162
in SECTION 8 – UNIT OPERATION and Table 24 on
page 164 and Table 25 on page 165.
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
14, the chiller may have single or dual systems. 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
assure 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 QTC3150THE Specifications

General

Brand	Quantech
Model	QTC3150THE
Category	Chiller
Language	English