Section 32 - System Calibration, Service Setpoints And Reset Procedures; Electro-Mechanical Starter Applications - Johnson Controls YORK OPTIVIEW YK Series Service Instructions Manual

FORM 160.54-M1
SECTION 32 - SYSTEM CALIBRATION, SERVICE
The chiller is supplied from the YORK factory with
all factory mounted components fully calibrated. The
following procedures are used to verify these calibra-
tions or calibrate a component after it has been field
replaced.
Most of the following procedures require the Service
technician to be logged in at SERVICE access level
(Access Code 1 3 8 0). However, others require the
ADMIN (Administration) access level. The ADMIN
Password changes daily and is valid for 1 calendar day
only. This password is obtained by contacting the local
Johnson Controls Service Office. When requesting this
password, supply the "Controls" version of software
(available on the DIAGNOSTIC Screen) and the cal-
endar day on which you intend to use it.
Programmable Service setpoints are used by the Pro-
gram to control critical chiller operation. Also, some
of these setpoints can be used to enable or disable cer-
tain features. Although they have been entered at the
YORK factory, they can be changed by a field Service
technician. If the BRAM battery backed memory de-
vice is field replaced, all of the programmed setpoints
will be lost. They will have to be re-entered into the
new BRAM. Each of these setpoints is described be-
low. Programming procedures and OptiView™ Con-
trol Center Keypad operation required in the proce-
dures below are detailed in OptiView™ Control Panel
– Operation (Form 160.54-O1). In general, the follow-
ing procedure is used to enter setpoints in this section:
1. Log in with the appropriate access level.
2. Select the appropriate Display Screen.
3. Press the desired setpoint key.
A dialog box appears, giving the minimum and
maximum allowed values, Default value and pres-
ent value. The dialog box can be canceled at any
time by pressing the CANCEL (X) key.
4. If the dialog box begins with the word "Enter", use
the numeric keys to enter the desired value. Lead-
ing zeroes are not necessary. Press the
a decimal point at the appropriate place. Pressing
the  key displays the Default value. Pressing the
 key clears the entry. The
JOHNSON CONTROLS
SETPOINTS AND RESET PROCEDURES
•
key to place
◄
key is a backspace
key and causes the entry point to move back one
space. If the dialog box begins with SELECT or
◄
ENABLE, use the
◄
desired value. The
►
the key increases the value.
5. Press the ENTER () key. If the value is within
range, it is accepted and the dialog box disappears.
The chiller will begin to operate based on the new
value. If out of range, the value is not accepted
and a message describing why it is not acceptable
is displayed momentarily.
Some safety shutdowns will not permit the chiller to
start until a special reset procedure is performed. These
reset procedures require SERVICE access level and
should not be performed by anyone other than a Ser-
vice technician. Each of these procedures is described
below.
ELECTRO-MECHANICAL STARTER
APPLICATIONS
If the Compressor Motor is driven by an Electro-Me-
chanical Starter, the OptiView™ Control Center is
equipped with a CM-2 Current Module along with sup-
porting components Diode Bridge (DB) and Calibra-
tion Resistors (RES), as described in a previous chap-
ter of this manual. The following procedures can be
used to verify the calibration and perform the calibra-
tion, if necessary. In addition to the calibration, Switch
S1 and potentiometer R16 have to be set appropriately
on the CM-2 Module. If the CM-2 and/or RES are field
replaced, field calibration is necessary.
CM-2 Settings
1. Place Switch S1 in the appropriate position per
the Starter type:
UP: Y-Delta or 57% Auto-transformer Starter
DOWN: All others
2. Calculate LRA/FLA ratio by dividing the Motor
Lock Rotor Amps by the chiller Full Load Amps
(LRA/FLA = ratio) and then adjust potentiometer
R16 to the ratio value.
►
and keys to select the
key decreases the value, and
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