2.3COMPRESSOR
All models shall use a high efficiency scroll compressor with step capacity providing 2 stages of control. The compressor shall be covered by a 5-year parts warranty. The refrigeration circuit shall be equipped with factory installed high and low-pressure controls. The refrigeration control shall be a factory installed TXV. Compressor shall be mounted on isolation rails with double grommets. Unit shall be provided with R-410A (HFC) non-ozone depleting refrigerant. Unit shall be provided with liquid line filter/drier.
Current sensing relay shall be used to detect high amps caused by high ambient and/or low voltage and to shift compressor to 1st-stage operation until conditions corrected
2.4COAXIAL WATER COIL
All models shall have either cupronickel or copper (SELECT ONE); water coil, fully insulated, with double o-ring connections. Copper coils should not be used on open wells.
2.6INDOOR BLOWER MOTOR
The indoor blower motor shall be a variable speed (ECM) type to produce the same rated airflow from 0 to .8 inch WC of external static pressure (.5 on Q24W model) at low sound levels. The motor is to be self-adjusting to provide proper rated airflow at high static pressures without user adjustment or wiring changes by the user. The motor shall be programmed for 20-second ramp up and 60-second down rate for quiet, smooth starting and stopping. ECM motor shall include preprogrammed speeds for ventilation mode, first stage operation, second stage operation, ducted operation, and non- ducted operation.
2.7ELECTRICAL COMPONENTS
Electrical components are easily accessible for routine inspection and maintenance through front service panels. Circuit breaker is standard on all 208/230-volt models and rotary disconnect standard on all 460-volt models. Circuit breaker/rotary disconnect access is through lockable access panel. Lock and key are provided as standard equipment. Unit shall have single point entry for line voltage.
2.8CONTROL CIRCUIT
The internal control circuit shall consist of a current limiting 24VAC type 65VA transformer with circuit breaker. To prevent rapid compressor short cycling, a five-minute time delay circuit shall be factory installed. Two low-pressure controls shall be included as
F1915 (2012 04) | Page 2 of 6 |
