Specifications

Catalog 602-2 37
Notes for following field wiring diagram
1. The compressor front end box is factory mounted
and wired. All incoming line side wiring must be
in accordance with the NEC and be made with
copper wire and copper lugs only. Use only
copper supply wires with ampacity based on
75°c conductor rating. Main power wiring
between the front end box and compressor
terminals is factory installed.
2. Minimum wire size for 115 VAC is 12 ga. for a
maximum length of 50 feet. If greater than 50
feet refer to Daikin McQuay for recommended
wire size minimum. Wire size for 24 VAC is 18
ga. All wiring to be installed as NEC Class 1
wiring system. All 24 VAC wiring must be run in
separate conduit from 115 VAC wiring. Wiring
must be wired in accordance with NEC and
connection to be made with copper wire and
copper lugs only.
3. Voltage unbalance not to exceed 2% with a
resultant current unbalance of 6 to 10 times the
voltage unbalance per NEMA MG-1, 1998
Standard. Voltage variation is +/- 10% of
nameplate voltage.
4. A customer furnished 24 or 120 VAC power for
alarm relay coil may be connected between
UTB1 terminals 84 power and 81 neutral of the
control panel. For normally open contacts wire
between 82 & 81. For normally closed wire
between 83 & 81. The alarm is operator
programmable. Maximum rating of the alarm
relay coil is 25 VA.
5. Remote on/off control of unit can be
accomplished by installing a set of dry contacts
between terminals 70 and 54.
6. If field supplied flow switches are used in
addition to the factory-mounted flow switches,
they must be wired as shown and be suitable for
24vac and low current application.
7. Customer supplied 115 VAC 20 amp power for
optional evaporator and condenser water pump
control power and tower fans is supplied to unit
control terminals (UTB1) 85 power / 86 neutral,
PE equipment ground.
8. Optional customer supplied 115 VAC, 25 VA
maximum coil rated, chilled water pump relay
(ep1 & 2) may be wired as shown. This option
will cycle the chilled water pump in response to
chiller demand.
9. The condenser water pump must cycle with the
unit. A customer supplied 115 VAC 25 VA
maximum coil rated, condenser water pump
relay (CP1 & 2) is to be wired as shown. Units
with free-cooling must have condenser water
above 60°F before starting.
10. Optional customer supplied 115 VAC 25 VA
maximum coil rated cooling tower fan relays
(C1 - C2 standard, C3-C4 optional) may be
wired as shown. This option will cycle the
cooling tower fans in order to maintain unit
head pressure.
11. Auxiliary 24 VAC rated contacts in both the
chilled water and condenser water pump starters
may be wired as shown for additional flow
protection.
12. A 4-20 mA external signal for chilled water
reset can be wired to terminals 71 and 51 on the
unit controller; load limit is wired to terminals
71 and 58 on the unit controller.