Bryant 4-WAY MULTIPOISE TWO-STAGE CONDENSING GAS FURNACE 352AAV Instrukcje Operacyjne Pobierz pdf (Strona 60)

UNIT DAMAGE HAZARD

Failure to follow this caution may result in damage to the heat

exchangers due to over temperature or condensate corrosion.

1. NEVER connect Low Speed (Red) wire to “HI HEAT”.

2. Do NOT connect Medium Low Speed (Blue) wire to

“HI-HEAT” on 80,000 Btuh and 120,000 Btuh input

model sizes.

CAUTION

Table 18 – Speed Selection

LEAD COLOR SPEED AS SHIPPED

White Common COM

Black High Cool

Yellow M e d --- H i g h SPARE

Orange† Med H i g h --- G a s H e a t

Blue M e d --- L o w Spare/High---Gas Heat

Red Low* L o w --- G a s H e a t

* Continuous blower speed

† Available on 5-speed blowers only

For low-heat, the following connections can be made at LO-

HEAT on control:

a. Med (Orange) -- Available only on 5-speed motors

b. Med-Low (Blue)

c. Low (RED) -- Factory setting.

To change blower motor speed selections for heating mode,

remove blower motor lead from control HI-HEAT terminal. (See

Fig. 37.) Select desired blower motor speed lead from one of the

other motor leads and relocate it to HI-HEAT terminal. See Table

18 for lead color identification. Reconnect original lead on

SPARE terminal. Follow this same procedure for proper selection

of LO-HEAT and COOL speed selection.

Set Blower Off Delay

a. Remove Blower Access Door if installed.

b.TurnDipswitch2and3ONorOFFfordesired

blower off delay. See Table 11 and 12 or Fig. 36

and 37.

ADJUST BLOWER OFF DELAY (HEAT MODE)

If desired, the main blower off time delay period may be

lengthened or shortened when operating in the heating mode to

provide greater comfort. See Table 11 for position of switches

and Fig. 36 or 37 for location of switches on control center.

SETTHERMOSTATHEATANTICIPATOR

When using a nonelectronic thermostat, the thermostat

heat-anticipator must be set to match the amp draw of

the electrical components in R-W/W1 circuit. Accurate amp

draw readings can be obtained at thermostat subbase terminals

RandW.

Fig. 61 illustrates an easy method of obtaining actual amp draw.

The amp reading should be taken after blower motor has started

and furnace is operating in low heat. To operate furnace in

low-heat, first move SW-1 to ON position, then connect ammeter

wires as shown in Fig. 61. The thermostat anticipator should

NOT be in the circuit while measuring current. If thermostat has

no subbase, the thermostat must be disconnected from R and

W/W1 wires during current measurement Return SW-1 to final

desired location after completing the reading.

See thermostat manufacturer’s instructions for adjusting heat

anticipator and for varying heating cycle length.

When using an electronic thermostat, set cycle rate for 3 cycles

per hour.

Step 6 -- Check Safety Controls

This section covers the safety controls that must be checked

before the installation is complete. The flame sensor, gas valve,

and pressure switch were all checked in the Start-up procedure

section as part of normal operation.

1. Check Primary Limit Control

This control shuts off gas control system and energizes

air-circulating blower motor if furnace overheats.

Recommended method of checking this limit control is to

gradually block off return air after furnace has been

operating for a period of at least 5 minutes. As soon as

limit control has shut off burners, return-air opening

should be unblocked to permit normal air circulation. By

using this method to check limit control, it can be

established that limit is functioning properly and operates

if there is a restricted return-air supply or motor failure. If

limit control does not function during this test, cause must

be determined and corrected.

R Y W G

10 TURNS

THERMOSTAT SUBBASE

TERMINALS WITH

THERMOSTAT REMOVED

HOOK-AROUND

VOLT/AMMETER

EXAMPLE:

5.0 AMPS ON AMMETER

10 TURNS AROUND JAWS

= 0.5 AMPS FOR THERMOSTAT SETTING

FROM UNIT 24-VOLT

TERMINAL BLOCK

A80201

Fig. 61 -- Amp Draw Check with Ammeter

2. Check Pressure Switch

This control proves operation of draft inducer. Check switch

operation as follows:

a. Turn off 115-v power to furnace.

b. Remove outer furnace door and disconnect inducer

motor lead wires from wire harness.

c. Turn on 115-v power to furnace.

d. Set thermostat to “call for heat” and wait 1 minute.

When pressure switch is functioning properly, hot

surface igniter should not glow, and status code LED

flashes a Status Code 32. If hot surface ignitor glows

when inducer motor is disconnected, shut furnace

down immediately. Determine reason pressure switch

did not function properly and correct condition.

e. Turn off 115-v power to furnace.

f. Reconnect inducer motor leads, reinstall main furnace

door, and turn on 115-v power supply.

352AAV

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