Bryant GAMA 331JAV User Manual

Page 8

Install accessible manual shutoff valve upstream of furnace gas

controls and within 72 in. of furnace. A 1/8-in. NPT plugged

tapping is provided on gas value for test gage connection.

Installation of additional 1/8-in. NPT plugged tapping, accessible

for test gage connection, installed immediately upstream of gas

supply connection to furnace and downstream of manual shutoff

valve is not required. Place ground joint union between gas control

manifold and manual shutoff.
Install sediment trap in riser leading to furnace. The trap can be

installed by connecting a tee to riser leading from furnace. Connect

capped nipple into lower end of tee. The capped nipple should

extend below level of gas controls. (See Fig. 9.)
After all connections have been made, purge lines and check for

gas leakage with regulated gas supply pressure.

VI. ELECTRICAL CONNECTIONS

A. 115-v Wiring
Refer to unit rating plate or Table 5 for equipment electrical

requirements. The control system requires an earth ground for

proper operation.

CAUTION: Do not connect aluminum wire between

disconnect switch and furnace. Use only copper wire.

Make all electrical connections in accordance with the current

edition of the National Electrical Code (NEC) ANSI/NFPA

70-1996 and any local codes or ordinances that might apply. For

Canadian installations, all electrical connections must be made in

accordance with CSA C22.1 Canadian Electrical Code or authori-

ties having jurisdiction.

NOTE: Proper polarity must be maintained for 115-v wiring. If

polarity is incorrect, the furnace control status LED will flash

rapidly and prevent heating operation.

WARNING: The cabinet must have an uninterrupted or

unbroken ground according to NEC ANSI/NFPA 70-

1996 and Canadian Electrical Code CSA C22.1 or local

codes to minimize personal injury if an electrical fault

should occur. This may consist of electrical wire or

conduit approved for electrical ground when installed in

accordance with existing electrical codes. Do not use gas

piping as an electrical ground.

B. 24-v Wiring
Refer to ESD Precautions Procedure before proceeding with 24-v

connections.
Make field 24-v connections at the 24-v terminal block. (See Fig.

10.) Connect terminal Y/Y2 as shown in Fig. 11 or 12 for proper

operation in cooling mode. Use AWG No. 18 color-coded, copper

thermostat wire only.
When furnace is installed in horizontal position with RH discharge

air, 24-v wire connections can be made easier by removing the 2

control box mounting screws and letting control box turn so that

24-v screw terminals are visible. Be sure to reinstall control box

after connections are made.

The 24-v circuit contains an automotive-type, 3-amp fuse located

on main control. Any 24-v electrical shorts during installation,

service, or maintenance could cause this fuse to blow. If fuse

replacement is required, use ONLY a 3-amp fuse. The control will

flash code 24 when fuse needs replacement.

C. Accessories

1. Electronic air cleaner (EAC)

TABLE 5—ELECTRICAL DATA

UNIT

SIZE

VOLTS—

HERTZ—

PHASE

OPERATING

VOLTAGE RANGE

MAX

UNIT

AMPS

MIN

WIRE

GAGE

MAX WIRE

LENGTH

FT‡

MAX FUSE OR

HACR-TYPE

CKT BKR AMPS†

Max*

Min*

036060

115—60—1

127

104

10.5

048080

115—60—1

127

104

14.2

060100

115—60—1

127

104

17.9

* Permissible limits of the voltage range at which the unit will operate satisfactorily.

† Time-delay fuse is recommended.

‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.

Fig. 9—Typical Gas Pipe Arrangement

A89414

GAS

SUPPLY

MANUAL

SHUTOFF

VALVE

(REQUIRED)

SEDIMENT

TRAP

UNION

Fig. 10—Control Center

A93348

PR2

COM

PR1

EAC-2

EAC-1

I-COO

HI-GAS -HEAT

LO-GAS -HEAT

PARK

FU1

SEC-1

SEC-2

10 11

MASTER SLAVE

TWIN TEST

LED

G
R

Y/Y2

W/W1

COM 24 V

OFF

FURNACE AND

BLOWER OFF DELAY

SETUP SWITCHES

24-VOLT

THERMOSTAT

TERMINALS

EAC - ELECTRONIC

AIR CLEANER

(115-VAC 1 AMP MAX)

3-AMP

FUSE

LED -

DIAGNOSTIC

LIGHT

TWIN / TEST

TERMINAL
HUM -

HUMIDIFIER

(24-VAC 0.5

AMP MAX)

HUM

—8—

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