Electrical Adjustments

SPEED TAP ADJUSTMENTS FOR INDOOR BLOWER MOTOR

PSC Motor

Adjust the CFM by changing the speed tap of the indoor blower motor at the EBTDR “COM” connection with one of the speed taps on “M1” or “M2”. (Black-High Speed, Blue-Medium Speed, Red- Low Speed.)

X-13 Motor

Adjust the CFM by changing the 24V low voltage lead at the speed terminal block on the motor. (T1-Low Speed, T2 and T3-Medium Speed, T4 and T5-High Speed).

REFRIGERANT CHARGE CHECKS

After completing airflow measurements and adjustments, the unit’s refrigerant charge must be checked. The unit is factory charged based on 400 CFM per ton at minimum ESP per AHRI test condi- tions (generally between .15 - .25 ESP). When air quantity or ESP is differs from this, charge must be readjusted to the proper amount. All package units are charged to the superheat method at the compressor suction line (these are fixed orifice devices).

For charging in the warmer months, 8 +/-3ºF superheat at the com- pressor is required at conditions: 95ºF outdoor ambient (dry bulb temperature), 80ºF dry bulb / 67ºF wet bulb indoor ambient, ap- proximately 50% humidity. This superheat varies when conditions vary from the conditions described.

A superheat charge chart is available for other operating condi- tions. Use it to provide the correct superheat at the conditions the unit is being charged at.

After superheat is adjusted it is recommended to check unit sub- cooling at the condenser coil liquid line out. In most operating conditions 10 - 15ºF of sub-cooling is adequate.

SUPERHEAT = SUCTION LINE TEMP - SAT. SUCTION TEMP

SATURATED SUCTION PRESSURE

TEMPERATURE CHART

Suction	Saturated Suction
Pressure	Temperature °F
PSIG	R-410A
50	1
52	3
54	4
56	6
58	7
60	8
62	10
64	11
66	13
68	14
70	15
72	16
71	17
76	19
78	20
80	21

SUBCOOLING = SAT. LIQUID TEMP. - LIQUID LINE TEMP.

SATURATED LIQUID PRESSURE

TEMPERATURE CHART

Liquid	Saturated Liquid
Pressure	Temperature °F
PSIG	R-410A
200	70
210	73
220	76
225	78
235	80
245	83
255	85
265	88
275	90
285	92
295	95
305	97
325	101
355	108
375	112
405	118

SYSTEMSUPERHEAT

SUPERHEAT CAN BE DETERMINED AS FOLLOWS:

1.Read suction pressure. Determine Saturated Suction Temperature from tables or pressure gauge saturated temperature scale (R-410A).

2.Read suction line temperature.

3.Use the following formula:

SUPERHEAT = SUCTION LINE TEMP - SAT. SUCTION TEMP

This series of electric cooling and, heat pump package equipment is designed to accept a field installed electric heat kit. The unit is equipped to easily install the HKR Series Electric Heat Kit. Full In- stallation Instructions are included in this kit. Please use this docu- ment for guidance in field equipping the package unit with electric heat.

Choose the heat kit that fits the application for the specific installa- tion. Permanently mark the unit’s nameplate with the model being installed. High and low voltage connections are detailed in the heat kit instructions.

Indoor Blower motor speed tap selection may need to be modified to accommodate normal continuous operation to prevent a nui- sance trip. See following table.