OO-A-373D
3.10.2 Safety protection. A high-limit pressure protection and low-limit pressure protection (or a dual pressure control) shall be used to limit pressures on the discharge side and the suction side, respectively, of the compressor. For units less than 135,000 Btu/hr (39 565 W) in lieu of a low limit pressure switch, a built-in thermostat in the compressor's motor windings or other means such as amperes drawn may be used.
3.10.3 Operating controls. Manual and automatic controls, factory wired and accessible for service and inspection, shall be provided except for thermostats. The control system shall permit operation either of the blower only or of the blower and refrigeration equipment simultaneously. When heating equipment is specified herein, a control system shall be installed for operating blowers and heating equipment simultaneously. When required, the control system shall provide means for single or multistage operation of heating and of cooling equipment including single and multizone equipment. Unless otherwise specified (see 6.2), connections shall be provided for connecting low voltage wiring (30 volts or less) for a remote thermostat to the unit for controlling the conditioned air.
3.10.4 Electrical resistance heater control. When electrical resistance heaters is provided integral with the unit, electrical heaters shall be electrically wired in accordance with UL 484 or UL 1995 as appropriate (see 3.8.6) or NFPA 70, as applicable; and controlled in one step or more steps.
No single step shall produce a temperature rise in the discharge air greater than 35 F (2 C).
3.10.5 Wiring. Wiring shall be factor-completed within each unit and shall include the wiring to all cabinet enclosed controls in accordance with UL 1995 requirements and NFPA 70.
3.11 Performance.
3.11.1 Cooling capacity. At a power input of not more than 105 percent of the voltage specified herein, the Btu/hr (W) cooling capacity specified herein (see 1.2 and 6.2) shall be not less than
95 percent of the rated capacity. For units under 135,000 Btu/hr (39 565 W), the rated capacity including motor heat mixed with chilled air shall be the standard rating in the ARI Directory of Certified Unitary Air-Conditioners. For units 135,000 Btu/hr (39 565 W) and over the rated capacity shall be the manufacturer's published rating, either standard rating or application rating specified in 3.5.1.5, as applicable in accordance with ARI 360.
3.11.2 Sensible cooling effect. The room sensible cooling effect (see 6.6) shall be not less than
60 percent of the total cooling effect in accordance with ARI 210/240 and ARI 360, as applicable.
3.11.3 Seasonal energy efficiency ratio (SEER) and energy efficiency ratio (EER). The units shall have a minimum SEER or EER as specified (see 6.1.8, 6.2, and 6.9).
3.11.4 Air flow rate. For standard ratings, the air quantities circulated through the air conditioning system as required in ARI 210/240 and ARI 360. For application ratings see 3.5.1.5.
3.11.5 Locked-rotor current. The total locked-rotor current of the hermetic motor compressors designed to start simultaneously by the controls provided, is the sum of the locked-rotor currents
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