Carrier 19XR, XRV specifications Initial START-UP, Refrigerant HFC-134a Charge

CHILLER EQUALIZATION WITH PUMPOUT UNIT — The following steps describe how to equalize refrigerant pres- sure on an isolated 19XR chiller using the pumpout unit.

1.Access the terminate lockout function on the CONTROL TEST screen.

2.IMPORTANT: Turn on the chilled water and con- denser water pumps to prevent freezing.

3.Open valve 4 on the pumpout unit and open valves 1a and 1b on the chiller cooler and condenser, Fig. 29 and 30. Slowly open valve 2 on the pumpout unit to equalize the pressure. This process takes approximately 15 minutes.

4.Once the pressures have equalized, the discharge isola- tion valve, cooler isolation valve, optional hot gas bypass isolation valve, and the refrigerant isolation valve can be opened. Close valves 1a and 1b, and all pumpout unit valves.

Whenever turning the discharge isolation valve, be sure to reattach the valve locking device. This prevents the valve from opening or closing during service work or during chiller operation.

The full refrigerant charge on the 19XR will vary with chill- er components and design conditions, as indicated on the job data specifications. An approximate charge may be determined by adding the condenser charge to the cooler charge as listed in Table 10.

Always operate the condenser and chilled water pumps whenever charging, transferring, or removing refrigerant from the chiller.

Use the CONTROL TEST terminate lockout function to monitor conditions and start the pumps.

If the chiller has been shipped with a holding charge, the refrigerant is added through the pumpout charging connection (Fig. 29 and 30, valve 1b). First evacuate the nitrogen holding charge from the chiller vessels. Charge the refrigerant as a gas until the system pressure exceeds 35 psig (141 kPa) for HFC-134a. After the chiller is beyond this pressure the refrig- erant should be charged as a liquid until all the recommended refrigerant charge has been added. The charging valve (Fig. 29 and 30, valve 7) can be used to charge liquid to the cooler if the cooler isolation valve (11) is present and is closed. Do not charge liquid through the linear float to the condenser.

TRIMMING REFRIGERANT CHARGE — The 19XR is shipped with the correct charge for the design duty of the chill- er. Trimming the charge can best be accomplished when the design load is available. To trim the charge, check the tempera- ture difference between the leaving chilled water temperature and cooler refrigerant temperature at full load design condi- tions. If necessary, add or remove refrigerant to bring the temperature difference to design conditions or minimum differential.

Table 10 lists the 19XR chiller refrigerant charges for each cooler and condenser code. Total refrigerant charge is the sum of the cooler and condenser charge.

Table 10 — Refrigerant (HFC-134a) Charge

COOLER	REFRIGERANT		CONDENSER	REFRIGERANT
	CHARGE			CHARGE
CODE			CODE
	lb	kg		lb	kg
10	290	132	10	200	91
11	310	141	11	200	91
12	330	150	12	200	91
15	320	145	15	250	113
16	340	154	16	250	113
17	370	168	17	250	113
20	345	157	20	225	102
21	385	175	21	225	102
22	435	197	22	225	102
30	350	159	30	260	118
31	420	190	31	260	118
32	490	222	32	260	118
35	400	181	35	310	141
36	480	218	36	310	141
37	550	250	37	310	141
40	560	254	40	280	127
41	630	286	41	280	127
42	690	313	42	280	127
45	640	290	45	330	150
46	720	327	46	330	150
47	790	358	47	330	150
50	750	340	50	400	181
51	840	381	51	400	181
52	900	408	52	400	181
55	870	395	55	490	222
56	940	426	56	490	222
57	980	445	57	490	222
60	940	426	60	420	190
61	980	445	61	420	190
62	1020	463	62	420	190
65	1020	463	65	510	231
66	1060	481	66	510	231
67	1090	494	67	510	231
70	1220	553	70	780	354
71	1340	608	71	780	354
72	1440	653	72	780	354
75	1365	619	75	925	420
76	1505	683	76	925	420
77	1625	737	77	925	420
80	1500	680	80	720	327
81	1620	735	81	720	327
82	1730	785	82	720	327
85	1690	766	85	860	390
86	1820	825	86	860	390
87	1940	880	87	860	390

INITIAL START-UP

Preparation — Before starting the chiller, verify:

1.Power is on to the main starter, oil pump relay, tower fan starter, oil heater relay, and the chiller control panel.

2.Cooling tower water is at proper level and at-or-below design entering temperature.

3.Chiller is charged with refrigerant and all refrigerant and oil valves are in their proper operating positions.

4.Oil is at the proper level in the reservoir sight glasses.

5.Oil reservoir temperature is above 140 F (60 C) or above refrigerant temperature plus 50° F (28° C).

6.Valves in the evaporator and condenser water circuits are open.

NOTE: If the pumps are not automatic, ensure water is circulating properly.

Do not permit water or brine that is warmer than 110 F (43 C) to flow through the cooler or condenser. Refrigerant overpressure may discharge through the relief valves and result in the loss of refrigerant charge.

7.Access the CONTROL TEST screen. Scroll down on the TERMINATE LOCKOUT option. Press the SELECT (to enable the chiller to start) and answer YES to reset unit to operating mode. The chiller is locked out at the factory in order to prevent accidental start-up.

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