Carrier 25VNA8 User Manual

6
Step 7 — Make Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not supply power to unit with compressor terminal box
cover removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
permissible limits.
NOTE: Use copper wire only between disconnect switch and unit.
NOTE: Install branch circuit disconnect of adequate size per NEC
to handle unit starting current. Locate disconnect within sight from
and readily accessible from unit, per Section 440--14 of NEC.
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes.
Connect Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 6.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
TERMINAL
BLOCK
GROUND
LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
A14028
Fig. 6 -- Line Power Connections
Connect Control Wiring --Infinity Touch
Connect to Infinity connections. Only two wires (AB) to Infinity
capable indoor unit (furnace or fan coil) are required. Connect C if
additional grounding is required (see Fig. 7).
IMPORTANT: This system requires the power supplied to the
outdoor unit, and the indoor unit, for the UI to communicate with
the outdoor unit.
Connect Control Wiring-- Non--Communicating
Six wires are required when con necting 25 VNA8 mod els to
non--communicating 2-- stage thermostats. Use Fig. 8 For required
connections. Unit is configured by factory for Infinity
communicating control. To wire unit for non-- communicating
control, disconnect the green (A) and yellow (B) wires from
ABCD plug and connect appropriate wires to low voltage terminal
block. Use wire nuts to attach thermostat wire to LVCH harness.
General Information
Use No. 18 AWG or larger color-- coded, insulated (35C
minimum) wire for low voltage control wires.
All wiring must be NEC Class 2 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transformer for control power requirement of system accessories
external to the OD unit. The outdoor unit has its own transformer
power.
Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections to
ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
D
C
B
A
User Interface (UI)
D
C
B
A
D
C
B
A
HP
OAT
RYOWCHUM
C
Humidifier
24vac
C and D
not required
’C’ connection optional
Furnace or Fan Coil
A11144
Fig. 7 -- Infinity Furnace or Fan Coil Wiring with
Communicating Variable Speed HP
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations .
Catalog No: 25
V
N
A
8 --- 5 S I
Replaces: 25VNA8---4SI

Carrier 25VNA8 Specifications

General

Brand	Carrier
Model	25VNA8
Category	Heat Pump
Language	English