York YUKC 07-18 Installation & Owner's Manual

Contents

20 ENGLISHDEFROSTING OPERATION (Available for heating only)1. Condition to start defrosting: Units will switch to defrostingmode when either of the following conditions is met.a. Unit has been running under T3 < 0ºC for 40minutes and T3 < -3ºC for 3 minutes.b. Unit has been running at high temperature protectionmode* for 90 minutes. (*High temperatureprotection mode: when coil temperature of indoorunit reaches 55°C, outdoor unit will turn off externalunit fan but still keep compressor running).2. Condition to stop defrosting: Units will switch back toheating mode when either of the following conditionsis met.a. Unit has been running at defrosting mode for 10minutes.b. T3 > 20 ºCRemark: T3 is coil temperature of outdoor units.T3 (°C)3 min40 minHeating mode Defrosting modeTimeElapsed(min)Starting Defrosting Mode under condition a.SERVICE AND MAINTENANCEThe units are designed to operate for long periods of time with a minimum of maintenance. However, the followingoperations must be performed regularly.COMPONENT MAINTENANCE OPERATIONS RECOMMENDED FREQUENCYAir filter 1 - Clean with a vacuum cleaner or tap gentlythen wash in warm water (40°C) with a milddetergent.2 - Rinse and dry before replacing on unit.3 - Never use petrol, alcohol or any other chemi-cal product.Every month or more often ifnecessary.Unit casing 1 - Remove dust from the front panel with a softduster or wipe a damp cloth with a mild soapsolution.2 - Never use petrol, alcohol or any other chemi-cal product.Every month or more often ifnecessary.Drain pan and evacu-ation piping1 - Clean and check for obstructions. Each season before start up.Indoor / Outdoor coils 1 - Check condition and remove dust from be-tween coil fins.Each season before start up.Compressor 1 - No maintenance required. —J368-EN.indd 20 2/1/07 9:41:36 AM

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