Carrier 50PTH, PTV specifications Start-Up, Operating Limits, A50-8145 Water Out

a50-8145 Water Out					Refrigerant In
(To Water Loop)	Mixing Valve				(Cooling)
Water In		Internal Pump
					COAX
(From Water Loop)
			Refrigerant Out
				(Cooling)	Entering Air

NOTE: All components shown are	Evaporator Coil
internal to the heat pump unit.

Leaving

Air

Reheat

Coil

Fig. 33 — HWR Schematic

START-UP

Use the procedure outlined below to initiate proper unit start-up.

NOTE: This equipment is designed for indoor installation only.

Operating Limits

ENVIRONMENT — This equipment is designed for indoor installation ONLY. Extreme variations in temperature, humidi- ty and corrosive water or air will adversely affect the unit per- formance, reliability and service life.

POWER SUPPLY — A voltage variation of ± 10% of name- plate utilization voltage is acceptable.

UNIT STARTING CONDITIONS — Units start and operate in an ambient temperature of 45 F with entering-air tempera- ture at 50 F, entering-water temperature at 60 F and with both air and water at the flow rates used.

NOTE: These operating limits are not normal or continuous operating conditions. Assume that such a start-up is for the purpose of bringing the building space up to occupancy tem- perature. See Table 18 for operating limits.

WARNING

When the disconnect switch is closed, high voltage is pres- ent in some areas of the electrical panel. Exercise caution when working with the energized equipment.

3.Balance airflow at registers.

4.Adjust all valves to the full open position and turn on the line power to all heat pump units.

5.Operate unit in the cooling cycle first, then the heating cycle. Refer to Table 18 for unit operating limits. Al- low 15 minutes between cooling and heating tests for pressure to equalize.

NOTE: Two factors determine the operating limits of a unit: entering-air temperature and water temperature. Whenever any of these factors are at a minimum or maximum level, the other two factors must be at a normal level to ensure proper unit operation. See Table 18.

Table 18 — Operating Limits —

50PTH, PTV, PTD Units

AIR LIMITS	COOLING (F)	HEATING (F)
Min. Ambient Air	45	40
Rated Ambient Air	80	70
Max. Ambient Air	100	85
Min. Entering Air	50	40
Rated Entering Air db/wb	80/67	70
Max. Entering Air db/wb	110/83	80
WATER LIMITS
Min. Entering Water	30	20
Normal Entering Water	50-110	30-70
Max. Entering Water	120	90
LEGEND

db — Dry Bulb wb — Wet Bulb

1.Restore power to system.

2.Turn thermostat fan position to ON. Blower should start.

NOTE: Value in heating column is dry bulb only. Any wet bulb reading is acceptable.

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