Heat Controller R-410A XVIII. SEQUENCE OF OPERATION - 61⁄2 AND 71⁄2 TON, Xix. Accessories

TABLE 6

REQUIRED OZS. R-410A PER FT. OF TUBING

Tube Size	Liquid	Vapor
O.D., In.	oz/ft	oz/ft
1/2	1.06	0.04
5/8	1.65	0.07
3/4	2.46	0.10
7/8	3.28	0.13
1 1/8		0.22
1 3/8		0.34
1 5/8		0.48
2 1/8		0.84

Quantities based on 110°F liquid and 45°F vapor.

BASIC SYSTEM CHARGE*

Unit	Basic System
Model	Charge, Oz. [g] *
RSG078	178 [5046]
RSG090	242 [6861]

*-System with 0 Feet [0] of tubing.

15.Note weight of refrigerant tank.

16.When system has stabilized, check superheat at the suction line service valve. The actual line temperature should be 15° to 25°F higher than the saturation temperature corresponding to the suction pressure. If superheat is measured at evaporator, the actual line temperature should be 15° to 20° higher than the saturation temperature corresponding to the suction pressure.

17.Close service ports on suction and liquid valves. Remove service gauges.

18.Replace service port caps and valve stem caps. These caps must be replaced to prevent leaks.

19.Record total charge quantity on rating plate.

XVIII. SEQUENCE OF OPERATION — 61⁄2 AND 71⁄2 TON

1.When the room temperature is higher than the thermostat setting, the thermostat con- tacts close and energize the compressor contactor (CC) through the high pressure, and low pressure controls. If the unit has “short cycled” and the optional anti-short cycle timer (TDC) has been supplied, the contactor coil (CC) will remain de-energized for up to five (5) minutes.

2.The system will continue cooling operation, as long as the contacts of all safety devices are closed and until the thermostat is satisfied.

3.When the thermostat is satisfied, compressor or contactor (CC) is de-energized.

XIX. ACCESSORIES

A. ANTI-SHORT CYCLE TIMER

ANTI-SHORT-CYCLE TIMER — Prevents restarting of unit for five minutes if shut down for any reason. (See wiring diagram and schematic in this manual for proper location and installation; item TDC.)

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