Greenheck Fan PVF manual Furnace Controls, Performance Data, Staged Temperature Controls

Performance Data

									Air Temperature Rise Through Unit (°F)
Model	Input	Output	20		30		35	40		45		50	55		60		65	70	75	80		85		90		95	100
				25
Number	(MBH)	(MBH)											CFM
PVF 100	100	80	3704	2963	2469	2116		1852		1646	1481		1347	1235		1140		1058	988	926	871		823		780		741
PVF 150	150	120	5556	4444	3704	3175		2778		2469	2222		2020	1852		1709		1587	1481	1389	1307		1235		1170		1111
PVF 200	200	160	7407	5926	4938	4233		3704		3292	2963		2694	2469		2279		2116	1975	1852	1743		1646		1559		1481
PVF 250	250	200	9259	7407	6173	5291		4630		4115	3704		3367	3086		2849		2646	2469	2315	2179		2058		1949		1852
PVF 300	300	240	11111	8889	7407	6349		5556		4938	4444		4040	3704		3419		3175	2963	2778	2614		2469		2339		2222
PVF 350	350	280	12963	10370	8642	7407		6481		5761	5185		4714	4321		3989		3704	3457	3241	3050		2881		2729		2593
PVF 400	400	320	14815	11852	9877	8466		7407		6584	5926		5387	4938		4558		4233	3951	3704	3486		3292		3119		2963

Ratings shown are for elevations up to 2000 ft. For higher elevations, the input should be reduced by 4% per 1000 ft. of elevation above sea level. In Canada, from 2000 to 4500 ft in elevation, the unit must be derated to 90% of the input listed above. The unit shall also be used in accordance with standard CGA 2.17.

Furnace Controls

Staged Temperature Controls

For Energy Recovery Units without Temperature Control Package

The furnace stage controls are located in the furnace control center. One control is provided for each stage of heating. The discharge temperature setting is located on the control furthest to the left. The offset and differential settings for each stage are preset at the factory; however, field-adjustments may be made to get the best control for your application. See the literature provided with the controls for further information.

For Energy Recovery Units with Temperature Control Package

If two-stage control is ordered with a Temperature Control Package, the controller in the unit’s main control center will control the stages of heating. The temperature set

point may be adjusted on the controller (See Temperature Controller IOM).

Figure 3: Staged Controls

Staged Burner Adjustments

Setting Manifold Pressure for Two Stage Gas Control

1.Set the unit to high fire by setting the discharge temperature control or thermostat to its maximum setting. If the ambient temperature is warm, the unit may not stay at high fire.

2.Measure the burner manifold pressure at the manifold pressure test port (see Control Center Layout on page 3) using a “U” tube manometer. The pressure on high fire should be 3.5 in. wg for natural gas and 10 in. wg for LP gas. To change the pressure, adjust the regulator adjustment screw on the combination gas valve.

3.Set the unit to low fire by removing the wire from the high fire terminal on the combination gas valve.

4.The manifold pressure on low fire for natural gas should be 0.88 in. wg and 2.5 in. wg for LP gas. To change the pressure, use the low fire adjustment screw on the combination gas valve.

Solenoid

High Fire Adjustment

Low Fire Adjustment

High Fire

Terminal

Figure 4: Combination Gas Valve

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