Johnson Controls YORK YPC Series, Installation Manual

Page: 81 / 114

JOHNSON CONTROLS
81
29
FORM 155.17-N1
ISSUE DATE: 4/1/2013
All field wiring to be in accordance with
the National Electrical Code (N.E.C.) as
well as all other applicable State and local
codes and specifications. The installer(s)
must be a fully qualified and licensed
individual(s) that is familiar with and
op er ates within these codes.
ELECTRICAL CONNECTIONS
Included with the unit shipment is a Unit Wiring Di a-
gram (located in the micro panel enclosure), a Power
Panel Wiring Diagram (located in the power panel en-
clo sure), and a Burner Wiring Diagram (located in the
burner control panel of Direct-Fired units only). For
more in for ma tion and de tails of unit wiring, refer to
the ap pro pri ate Johnson Controls forms as listed at the
front of this doc u ment under the Introduction Section.
All the forms list ed can be obtained through the local
Johnson Controls Service office.
The incoming three-phase power supply to the unit
must be rout ed through a CUSTOMER SUPPLIED
re mote, fused dis con nect switch.
For determining the
size of the fuses, refer to the Max-Dual Element Fuse
size as listed under the Electrical Data ta ble within Ap-
pen dix A of this document.
Located in the Pow er Pan el of all ParaFlow
TM
Chill er/
Heat er ab sorp tion units is a non-fused, service dis con-
nect switch. For most mod els it is rated at 100 amps.
For the larger low volt age, direct-fired mod els, it is
rated at 250 amps. The incoming power lines from
the cus tom er supplied fused disconnect switch must
be con nect ed to L1, L2, and L3 terminals within the
power panel. This is the only power connection need-
ed to the chiller. The micro panel control power (115V,
50/60 Hz, 10 amps - 1.0 KVA) is supplied through a
factory mounted control pow er trans form er located in-
side the power panel. If multiple conduits are used for
the incoming three phase power, they should contain
an equal number of wires from each phase in each con-
duit to prevent overheating. Use copper conductors
only; Do not use aluminum con duc tors. Flexible
conduit for final connection to the power panel should
used in the extreme case of unit vi bra tion.
The unit must be grounded in accordance with ap-
plicable codes. Use only copper conductors for all
grounding. The power panel is furnished with ground-
ing lugs suit able for wire sizes between #14 to 1/0
AWG.
WIRING THE PURGE PUMP
One Welsh purge pump is supplied and shipped loose
with every ParaFlow
TM
Ab sorp tion chiller/heater. A
factory supplied harness is con nect ed to the ap pro-
pri ate terminals within the unit panel. However, the
purge pump end of this harness must be connected
to the correct purge pump terminals inside the purge
pump motor connection box in the field. The mount-
ing and elec tri cal connection of the purge pump could
be done by ei ther the in stall ing con trac tor or Johnson
Controls service (this should be determined at the time
the contract is awarded to the installer). See Figure 42
on page 83
for wiring con nec tions.
Make sure the purge pump motor is turn-
ing in the correct direction.
FIELD CONTROL MODIFICATIONS AND
SAFETY DEVICES
There are many connections which need to be made
dur ing installation so that the YORK ParaFlow™
chiller/heat er func tions properly and can communi-
cate with oth er cus tom er remote devices and systems
if desired.
When any auxiliary safety device is used, the factory
in stalled jumper between terminals 4 and 53 on termi-
nal block 5 must be re moved.
To aid the installer with these connections, it is im per-
a tive that the following YORK forms be on hand:
• 155.17-W1 (297):
Wiring diagram for Direct-
Fired units
• 155.19-W1 (197): Wiring diagram for Steam-
Fired units.
• 155.17-PA1 (1296): Field Control Modifications
Di a gram for both Direct-Fired and Steam ma-
chines.
SECTION 29 – ELECTRICAL CONNECTIONS