Amana VR8205 X. Start-Up,Adjustments, and Checks, Figure Counterflow Furnaces, Other Items

CAUTION

To prevent personal injury, use only blunt pointed screws to attach the plenum to the furnace and filter rack. Screws should not be placed where they could interfere with filter replacement.

	Dimension	"A",	M inimum R	ecommended
Siz e_ Air	Inches		F ilter Siz	es,	Inches
F low
	T hrow aw ay	Perm.	F iberglass		Permanent
			T hrow aw ay
045_30	15-1/2	8	(2) 16x 20x 1		(2) 10x 20x 1
070_30	15-1/2	8	(2) 16x 20x 1		(2) 10x 20x 1
070_40	19-3/4	8	(2) 20x 20x 1		(2) 10x 20x 1
090_30	14-1/4	13	(2) 16x 20x 1		(2) 15x 20x 1
090_50	24-1/4	13	(2) 25x 20x 1		(2) 15x 20x 1
115_40	17-3/4	11	(2) 20x 20x 1		(2) 15x 20x 1
115_50	23-1/2	11	(2) 25x 20x 1		(2) 15x 20x 1
140_50	23-1/2	11	(2) 25x 20x 1		(2) 15x 20x 1

9.After a 15 second delay while flue products are purged from the furnace heat exchanger, the induced draft blower motor is de-energized.

10.The air circulation blower has an adjustable delay-off timing of 60, 90, 120 or 180 seconds (starting from the time the gas valve closes). This allows more heat from the furnace to be transferred to the conditioned space. After this time has elapsed, the blower will be de- energized.

NORMAL COOLING SEQUENCE - INTEGRATED IGNITION CONTROL

With the room thermostat in the FAN-AUTO position, the indoor air circulation blower and outdoor condensing unit will be energized when a call for cooling occurs. When the call for cooling ends, the outdoor condensing unit will be de- energized. The indoor air circulation blower will continue to run for 45 seconds.

OTHER ITEMS

Constant Fan. During normal operation, the air circu- lation blower will continually run at “Cooling” speed as long as power is present at terminal G. If a call for heat occurs, the blower will run at heating speed throughout the heating cycle.

Figure 30

Counterflow Furnaces

3.With the air flow direction arrow pointing toward the furnace, insert the filters from the left side of the blower. Starting with the right filter, push the filter into the plenum so the bottom of the filter fits into the filter rack and the upper edge rests against the side of the plenum. Repeat with the left filter (Figure 29).

OTHER FILTER OPTIONS

External filter grilles can be used instead of the filter rack.

IX. Sequence of Operation (Integrated Ignition Control)

Refer to Timing Charts for sequencing.

NORMAL HEATING SEQUENCE

1.Thermostat calls for heat.

2.The induced draft blower is energized.

3.The ignitor is energized and is allowed to preheat for 17 seconds.

4.The gas valve is energized delivering gas to the burners and starting combustion.

5.The control checks for a signal from the flame sensor within seven seconds after the gas valve is energized. Gas will only continue to flow if a signal is present.

6.The control waits 30 seconds and turns on the air circulation blower to the speed that was selected for heating operation.

7.The thermostat is satisfied and opens.

8.The control de-energizes the gas valve.

21

If a trip on high/auxiliary/rollout limit occurs, the air circulation blower will run at “Heating” speed. Even if power is present at terminal G, the blower will run at heating speed until the limit closes.

X. Start-Up, Adjustments, and Checks

GENERAL OPERATION

This furnace is equipped with an electronic ignition device to light the burners and an induced draft blower to exhaust combustion products.

An interlock switch prevents furnace operation if the blower door is not in place. Keep the blower access doors in place except for inspection and maintenance.

This furnace is also equipped with a self-diagnosing elec- tronic control module. In the event a furnace component is not operating properly, the control module LED will flash on and off in a factory-programmed sequence, depending on the problem encountered. This light can be viewed through the observation window in the blower access door. Refer to the Diagnostic Signal Chart for further explanation of the lighting codes and Section X, Abnormal Operation - Integrated Ignition Control for an explanation of the pos- sible problem.

On new installations, or if a functional part such as the gas valve, pressure switch, or limit control has been replaced, verify that the furnace is operating properly after servicing.

Check furnace operation as outlined in the following in- structions. If any sparking, odors, or unusual noises are encountered, shut off electrical power and recheck for wiring errors, or obstructions in or near the blower motors. Various shipping materials must be removed before the blower motor is operated.