Bryant 912SA Instrukcja Obsługi Pobierz pdf (Strona 59)

(Read following caution before changing taps).

UNIT DAMAGE HAZARD

To avoid operating outside the rise range and avoid

component damage:

Refer to the Air Delivery Tables to determine which airflows

and settings are allowed for proper heating airflow. DO NOT

use the highlighted settings for Heating airflow. The

highlighted settings are to be used for Cooling ONLY.

CAUTION

Change these settings as required to maintain proper temperature

rise for Heating and Cooling as described above. To change blower

motor speed selections for heating mode, remove blower motor

lead from control HEAT terminal. (See Fig. 37) Select desired

blower motor speed lead from one of the other motor leads and

relocate it to HEAT terminal. Reconnect original lead on SPARE

terminal.

Adjust Blower Off Delay (Heat Mode)

The blower off delay has four adjustable settings from 90 sec to

180 sec. (See Table 16.) The blower off delay jumpers are located

on the furnace control (See Fig. 37 and Fig. 64.) To change the

blower off delay setting, move the jumper from one set of pins on

the control to the pins used for the desired blower off delay.

Factory blower off delay setting is 120 sec.

Table 16 – Blower Off Delay Jumper Positions

PINS 1AND2 2AND3 3AND4 4AND5

Time (in sec.) 90 120 150 180

Adjust Cooling Airflow

The cooling airflow can be set from the remaining blower speed

taps. Refer to the Air Delivery Tables in these instructions.

Adjust Thermostat Heat Anticipator

When using a non--electronic thermostat, the thermostat heat

anticipator must be set to match the amp draw of the electrical

components in R--W circuit. Accurate amp draw readings can be

obtained at the thermostat subbase terminals R and W. Fig. 54

illustrates the easy method of obtaining actual amp draw. The amp

reading should be taken after blower motor has started and furnace

is heating. Connect ammeter wires as shown in Fig. 54. 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 wires during current measurement.

See thermostat manufacturer’s instructions for adjusting heat

anticipator and for varying heating cycle length. For an electronic

thermostat, set cycle rate for 3 cycles per hr.

Check Safety Controls

The flame sensor, gas valve, and pressure switch were all checked

in the Start--up procedure section as part of normal operation.

1. Check Main Limit Switch

This control shuts off combustion system and energizes air--

circulating blower motor, if furnace overheats. By using this

method to check limit control, it can be established that lim-

it is functioning properly and will operate if there is a re-

stricted return--air supply or motor failure. If limit control

does not function during this test, cause must be determined

and corrected.

a. Run furnace for at least 5 minutes.

b. Gradually block off return air with a piece of cardboard or

sheet metal until the limit trips.

c. Unblock return air to permit normal circulation.

d. Burners will re--light when furnace cools down.

2. Check Pressure Switch(es)

This control proves operation of the draft inducer blower.

a. Turn off 115--v power to furnace.

b. 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

low pressure switch is functioning properly, hot surface

igniter should NOT glow and control diagnostic light

flashes a status code 31. If hot surface igniter glows when

inducermotorisdisconnected, shutdown furnaceimmedi-

ately.

e. Determine reason low pressure switch did not function

properly and correct condition.

f. Turn off 115--v power to furnace.

g. Reconnect inducer motor wires, replace door, and turn on

115--v power.

h. Blower will run for 90 sec before beginning the call for

heat again.

i. Furnace should ignite normally.

Checklist

1. Put away tools and instruments. Clean up debris.

2. Verify that jumper for the blower OFF DELAY is set as de-

sired per Table 16.

3. Verify that blower and control doors are properly installed.

4. Cycle test furnace with room thermostat.

5. Check operation of accessories per manufacturer’s instruc-

tions.

6. Review Owner’s Manual with owner.

7. Attach literature packet to furnace.

Table 17 – Altitude Derate Multiplier for U.S.A.

ALTITUDE

PERCENT

DERATE

MULTIPLIER

FACTOR*

FT. M

0–2000 0 --- 6 1 0 0 1.00

2001–3000 610---914 4 --- 6 0.95

3001–4000 914--- 1219 6 --- 8 0.93

4001–5000 1219--- 1524 8 --- 1 0 0.91

5001–6000 1524--- 1829 10--- 12 0.89

6001–7000 1829--- 2134 12--- 14 0.87

7001–8000 2134--- 2438 14--- 16 0.85

8001–9000 2438--- 2743 16--- 18 0.83

9001–10,000 2743--- 3048 18--- 20 0.81

*Derate mul tiplier factors are based on midpoint altitude for altitude range.

912SA

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