Carrier 48EZ(N)-A Instruction Manual download pdf (Page 5)

Single-Piece Installation — For single-piece installa-

tion, perform the following procedure.

1. Turn off all power to equipment.

2. If an existing thermostat is being replaced:

a. Remove existing control from wall.

b. Disconnect wires from existing thermostat, one at a

time.

c. As each wire is disconnected, record wire color and

terminal marking.

d. New or additional wires may be needed to accom-

modate added humidity outputs.

e. Discard or recycle old control.

3. Remove cover from equipment control module by pressing

the two tabs on the bottom edge and pulling away.

4. Route wires through large hole in equipment control mod-

ule base. Level base against the wall (for aesthetic purposes

only, the equipment control module does not need to be

leveled for proper operation) and mark wall through two

mounting holes.

5. Drill two

-in. mounting holes in wall where marked.

The equipment control module may be mounted on the

junction box, if desired. Make sure that the hole pattern on

base matches junction box mounting holes.

6. During thermostat installation provide sufficient excess

wiring behind the mounting plate. Coil the wiring creating

a service loop and place in mounting box or behind the

wall to remove strain against the terminal strip. See Fig. 4

on page 3.

7. Secure base to wall with two screws and anchors provided.

Additional mounting holes are available for more secure

mounting if needed. Make sure that all wires extend

through hole in mounting base.

8. Adjust length and routing of each wire to reach proper con-

nector block and terminal on mounting base with extra

-in. wire.

9. Connect equipment wiring to the terminals on the equip-

ment control module, being careful not to over-tighten the

screws. See Fig. 10.

10. Seal hole in wall to prevent air leaks. Leaks can affect oper-

ation and cause incorrect temperature and/or humidity

measurement.

11. Connect red wire of the pigtail to V+ terminal on the equip-

ment control board. Pigtail is packed loose in the box from

the factory. Pigtail is attached to the back of the display

module via 2-pin, keyed connector. Connect black wire of

the pigtail to Vg terminal on the equipment control board.

Correct polarity must be observed when connecting. If

wires are connected incorrectly, the display module will

not operate.

NOTE: The 2-wire pigtail is not intended to support the weight

of the user interface. Do not hang the display module from the

equipment control module screw terminals.

12. Attach 2-wire pigtail to display module.

RELAYS

OAT

RRS

SRTN

HUM

V+

O/W2/B

CONNECT

TO USER

INTERFACE

DRY

CONTACT

OAT/RRS

RETURN

JW6

TWIST

OFF

SEPARATE

RC/RH BY

BLACK

BREAKING

JW6 ON

CONTROL

MODULE

BOARD.

RED

LEGEND

OAT — Outdoor Air Temperature Sensor

RRS — Remote Room Temperature Sensor

Fig. 10 — Control Module Connector Block Terminals

a33-9170

Fig. 11 — Cover Installed on Equipment Control

Module

1 2 3 4 5 6 7 8 9 10 ... 27 28

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Carrier 48EZ(N)-A Instruction Manual Page 5

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