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Fig. 15 - field control thermostat wiring, Fig. 17 — 115-v field wiring – Carrier 50LJ User Manual

Page 20

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LOW-VOLTAGE

TERMINAL BLOCK

IN UNIT CONTROL BOX (PI)

THERMOSTAT/

SUBBASE

r-

0

&—J r~
@---------------' f
[wi]---------------1

^------------------------1

[

y

3----------------------

&-------------------------------

0------------------------

&--------------------

--------------------g
--------------------g

----------------^

I------------------ 0

I------------------- 0]

-----

0

I—0]

J

-----------0

____ I

Fig. 15 - Field Control Thermostat Wiring

CONVENIENCE

OUTLET

TB2

a

-0

1--------

1

-0

0

0

0

LEGEND

TB

— Terminal Block

NOTES:

1 Convenience outlet is field supplied and installed. Ground fault

outlet should be used.

2._______is field wiring.

Fig. 17 — 115-V Field Wiring

1 1 5 V

2 4 V

SWITCH 1 11?

I

SWITCH

5

I----- —o-'—'o—

ECON MTR

SWITCH 6

SEE NOTE 6

LEGEND

NOTES:

c

— Contactor

MTR

— Motor

ECON

— Economizer

PEC

— Power Exhaust Contactor

IFC

— Indoor (Evaporator)

PL

- Plug

Fan Contactor

TB

— Terminal Block

Switch

Switch

Switch

Switch

Switch

Switch

1

-

2

-

3 -

4 -

5

6

-

Firestat or smoke detector — normally closed.

Building pressurization switch (energize evaporator-fan

motor) — normally open.

Switch to isolate evaporator-fan motor from power exhaust

motor — normally closed

Switch purge switch (energizer power exhaust motor) —

normally open.

Switch to provide 24 v to economizer motor — normally open.

Switch to drive economizer outdoor-air damper full open —

normally closed.

BUILDING PRESSURIZATION

SMOKE PURGE

Switch 1

Switch 1

Switch 2

Switch 3

Switch 3 (if unit equipped with power exhaust)

Switch 4

Switch 5

Switch 5

Switch 6

Switch 6

Power exhaust option available

only

on vertical supply/return

units.

In order to Install Switch 1, field must remove factory jumper

between terminals 2 and 3 on terminal block 2

______field wiring.
______ factory wiring.

All switches are field supplied.

6. Terminals 8 and 9 can be located by removing the top of the

economizer motor. Turn over top of motor to access the elec­

tronic board and spade terminals.

Fig. 16 — Field Wiring for Building Pressurization

and Smoke Purge

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