Johnson Controls 13 SEER - GCGD installation manual Section Viii Electrical Connections

1031452-UIM-B-0513

SUPERHEAT CHARGING METHOD -

PISTON INDOOR

1.Operate system until temperatures and pressures stabilize (mini- mum of 10 minutes).

2.Measure and record indoor wet bulb (WB) temperature using a sling psychrometer and the outdoor dry bulb (DB) temperature using a thermometer.

3.Measure and record the suction pressure at the suction service valve port.

4.Using charts located on the unit, note the superheat value corre- sponding to the intersection of the indoor wet bulb and the outdoor dry bulb.

5.With the superheat value obtained in step 4 and the suction pres- sure value from step 3, find the intersection of the values on the chart. This is the required suction tube temperature at the suction service valve.

6.To bring the tube temperature in line with the required value from chart, add refrigerant to the service port to cause the tube temper- ature to fall and reclaim refrigerant to cause the temperature to rise.

SUBCOOLING CHARGING METHOD - TXV INDOOR

The recommended subcooling is 10°F

1.Set the system running in the cooling mode by setting the thermo- stat at least 6°F below the room temperature.

2.Operate the system for a minimum of 15-20 minutes.

3.Refer to the tabular data sheet for the recommended airflow and verify this indoor airflow (it should be about 400 SCFM per ton).

4.Measure the liquid refrigerant pressure P and temperature T at the service valve.

5.Calculate the saturated liquid temperature ST from Table 2.

6.Subcooling temperature TC = Saturated Temperature (ST) - Liquid Temp (T).

Example: The pressure P and temperature T measured at the liq- uid service port is 196 psig and 90°F, respectively. From Table 2, the saturated temperature for 196 psig is 100°F. The subcooling temperature TC = 100°-90°=10°F

Add charge if the calculated subcooling temperature TC in Step 6 is lower than the recommended level. Remove and recover the refrigerant if the subcooling TC is higher than the recommended level. See Table 2.

Check flare caps on service ports to be sure they are leak tight. DO NOT OVERTIGHTEN (between 40 and 60 inch - lbs. maximum).

TABLE 2: R-22 Saturated Properties
Pressure	Temp °F	Pressure	Temp °F	Pressure	Temp °F	Pressure	Temp °F		Pressure	Temp °F	Pressure		Temp °F
PSIG		PSIG		PSIG		PSIG			PSIG			PSIG
80	48	110	64	140	78	170	91	200		101	230		111
82	49	112	65	142	79	172	91	202		102	232		112
84	50	114	66	144	80	174	92	204		103	234		112
86	51	116	67	146	81	176	93	206		103	236		113
88	52	118	68	148	82	178	94	208		104	238		114
90	54	120	69	150	83	180	94	210		105	240		114
92	55	122	70	152	84	182	95	212		105	242		115
94	56	124	71	154	84	184	96	214		106	244		115
96	57	126	72	156	85	186	97	216		107	246		116
98	58	128	73	158	86	188	97	218		107	248		117
100	59	130	74	160	87	190	98	220		108	250		117
102	60	132	75	162	88	192	99	222		109	252		118
104	61	134	76	164	88	194	99	224		109	254		118
106	62	136	77	166	89	196	100	226		110	256		119
108	63	138	78	168	90	198	101	228		111	258		119

IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS- CHARGE REFRIGERANT INTO THE OPEN AIR DURING REPAIR, SERVICE, MAINTENANCE OR THE FINAL DISPOSAL OF THIS UNIT.

WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND THE OWNER HAS BEEN FULLY INSTRUCTED, SECURE THE OWNER’S APPROVAL.

All field wiring must USE COPPER CONDUCTORS ONLY and be in accordance with Local, National, Fire, Safety & Electrical Codes. This unit must be grounded with a separate ground wire in accordance with the above codes.

The complete connection diagram and schematic wiring label is located on the inside surface of the unit service access panel.

SECTION VIII: ELECTRICAL

CONNECTIONS

GENERAL INFORMATION & GROUNDING

Check the electrical supply to be sure that it meets the values specified on the unit nameplate and wiring label.

Power wiring, control (low voltage) wiring, disconnect switches and over current protection must be supplied by the installer. Wire size should be sized per NEC requirements.

FIELD CONNECTIONS POWER WIRING

1.Install the proper size weatherproof disconnect switch outdoors and within sight of the unit.

2.Remove the screws at the top and sides of the corner cover. Slide corner cover down and remove from unit.

3.Run power wiring from the disconnect switch to the unit.

4.Route wires from disconnect through power wiring opening pro- vided and into the unit control box as shown in Figure 6.

5.Install the proper size time-delay fuses or circuit breaker, and make the power supply connections.

6 Johnson Controls Unitary Products