York 048 & 060 Electric Heater Cfm Limitations, Economizer/Motorized Damper And Rain Hood

177820-YIM-A-0506

TABLE 3: ELECTRIC HEATER CFM LIMITATIONS

				MINIMUM SUPPLY AIR CFM
UNITMODEL SIZE NOMINAL
	VOLTAGE			HEATER SIZE NOMINAL KW
TONS
		5	7		10	15	20	30
	208/230-3-60	1100	1100		1200	1200	1300	-
3	460-3-60	-	1100		1200	1200	1300	-
	575-3-60	-	-		1200	1200	1300	-
	208/230-3-60	1300	1300		1300	1300	1300	-
4	460-3-60	-	1300		1300	1300	1300	-
	575-3-60	-	-		1300	1300	1400	-
	208/230-3-60	1600	1600		1600	1600	1600	1600
5	460-3-60	1600	1600		1600	1600	1600	1600
	575-3-60	-	1600		1600	1600	1600	1800

ECONOMIZER/MOTORIZED DAMPER AND RAIN HOOD

The instruction for the optional economizer/motorized damper and rain hood can be found in form 035- 07364-000. Use these instructions when field assem- bling an economizer rain hood onto a unit. The outdoor and return air dampers, the damper actuator, the damper linkage, the outdoor and return air divider baf- fles, and all the control sensors are factory mounted as part of the “Factory installed” economizer/motorized damper options.

POWER EXHAUST/BAROMETRIC RELIEF DAMPER AND RAIN HOOD

The instructions for the power exhaust/barometric relief damper and rain hood can be found in form 530.18- N1.10V.

All of the components, including the dampers, hard- ware, and mounting instructions are shipped in a single package external from the unit and must be field assembled and installed.

Power exhaust is only available as a field installed accessory.

ECONOMIZER AND POWER EXHAUST DAMPER SET POINT ADJUSTMENTS AND INFORMATION

Remove the economizer access panel from the unit. Loosen but do not remove the two panel latches. Locate the economizer control module, where the fol- lowing adjustments will be made.

Extreme care must be exercised in turning all setpoint, maximum, and minimum damper positioning adjustment screws to prevent twist- ing them off.

Check that the damper blades move smoothly without binding; carefully turn the Minimum Position Adjusting screw (found on the damper control module) fully clockwise and then set the thermostat indoor fan switch to the on position and then off, or energize and de- energize terminals “R” to “G”.

Unitary Products Group 11