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| When a heat pump system is in the heating mode and there is an increase in the temperature rise, what does this indicate? |
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| How often should throwaway filters be checked? |
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| Why should automotive oil never be used to lubricate blower motors? |
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| Major differences between an air conditioning and a heat pump system are _____. |
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| True or False? When changing a reversing valve, always position the valve so that the main piston is in a horizontal position and the pilot valve is lower than the main valve. |
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| Why must the reversing valve be placed a certain way? |
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