Bryant F Bedienungsanleitung PDF herunterladen (Seite 33)

Minimum Heating Entering Air Temperature

When operating on first stage heating, the minimum

temperature of air entering the dimpled heat exchanger is

50_F continuous and 45_F intermittent for standard heat

exchangers and 40_F continuous and 35_F intermittent for

stainless steel heat exchangers. To operate at lower

mixed--air temperatures, a field--supplied outdoor--air

thermostat must be used to initiate both stages of heat

when the temperature is below the minimum required

temperature to e nsure full fire ope ration. Wire the

outdoor--air thermostat OALT (part no. HH22AG106) in

series with the second stage gas valve. (See Fig. 41.) Set

the outdoor--air thermostat at 35_F for stainless steel heat

excha ngers or 45_F for sta ndard heat exchangers. This

temperature setting will bring on the second stage of heat

whenever the ambient temperature is below the thermostat

setpoint. Indoor comfort may be compromised when

heating is initiated using low entering air temperatures

with insufficient heating temperature rise.

LCTB

Thermostat

TH1

TH2

OALT

C08442

Fig. 41 -- OATL Connections

Troubleshooting Heating System

Refer to Table 13 and 14 for additional troubleshooting

topics.

Table 13 – Heating Service Analysis

PROBLEM CAUSE REMEDY

Burners Will Not Ignite.

Misaligned spark electrodes.

Check flame ignition and sensor electrode positioning.

Adjust as needed.

No gas at main burners.

Check gas line for air, purge as necess ary. After purging

gas line of air, allow gas to dissipate for at least 5 minutes

before attempting to relight unit.

Check gas valve.

Water in gas line. Drain water and install drip leg to trap water.

No power to furnace. Check power supply, fuses, wiring, and circuit breaker.

No 24 v power supply to control

circuit.

Check transformer. Transformers with internal overcurrent

protection require a cool down period before resetting.

Miswired or loose connections. Check all wiring and wire nut connec tions.

Burned ---out heat anticipator in

thermostat.

Replace thermostat.

Broken thermostat wires. Run continuity check. Replace wires, if necessary.

Inadequate Heating.

Dirty air filter. Clean or replace filter as necessary.

Gas input to unit too low.

Check gas pressure at manifold. Clock gas meter for input.

If too low, increase manifold pressure, or replace with

correct orifices.

Unit undersized for application. Replace with proper unit or add additional unit.

Restricted airflow. Clean filter, replace filter, or remove any restrictions.

Blower speed too low .

Use high speed tap, increase fan speed, or install optional

blower, as suitable for individual units.

Limitswitchcyclesmainburners.

Check rotation of blower, thermostat heat anticipator

settings, and temperature rise of unit. Adjust as needed.

Too much outdoor air.

Adjust minimum position.

Check economizer operation.

Poor Flame

Character i stics.

Incomplete combustion (lack of

combustion air) results in:

Aldehyde odors, CO, sooting

flame, or floating flame.

Check all screws around flue outlets and burner

compartment. Tighten as necessary.

Cracked heat exchanger.

Overfired unit — reduce input, change orifices, or adjust

gas line or manifold pressure.

Check vent for restriction. Clean as necessary.

Check orifice to burner alignment.

Burners Will Not Turn

Off.

Unit is locked into Heating mode

for a one minute minimum.

Wait until mandator y one---minute time period has elapsed

or reset power to unit.

580J

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