Specifications

64
Table 13 — Refrigerant Charges
CHILLER SHIPPED WITH HOLDING CHARGE — 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 refrigerant charging valve
(Fig. 30-33, valves 1a and 1b) or to the pumpout charging con-
nection. 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 refrigerant should be charged
as a liquid until all the recommended refrigerant charge has
been added.
TRIMMING REFRIGERANT CHARGE — T h e 23X RV
chiller is shipped with the correct charge for the design duty of
the chiller. The LTD (Leaving Temperature Difference) be-
tween the EVAP REFRIG LIQUID TEMP and LEAVING
CHILLED LIQUID can be checked against the design condi-
tions to confirm that the charge is correct. In the case where
leaks have been found and corrected and the LTD is greater
than about 4° F (2.2° C) above design, add refrigerant until the
full load design LTD is approached. (A high cooler LTD can
also be caused by dirty tubes, water box division plate bypass,
a partially closed liquid isolation valve, or the float valve.)
Trimming the charge can best be accomplished when the
design load is available. The calibration of the EVAP REFRIG
LIQUID TEMP and LEAVING CHILLED LIQUID tempera-
ture sensors should be confirmed prior to checking for proper
cooler LTD. Compare the difference between EVAP REFRIG
LIQUID TEMP and LEAVING CHILLED LIQUID tempera-
tures to the chiller design conditions. Add or remove refriger-
ant, if necessary, to bring the cooler leaving temperature
difference to design conditions or within minimum differential.
Check for low load oil recovery after making adjustments to
the refrigerant charge. The bubbling mixture of refrigerant and
oil mixture should be visible through the vaporizer sight glass
at low load when the oil reclaim valve is open. If a bubbling
mixture is not observed when the oil reclaim valve is open, add
refrigerant.
The preferred location at which refrigerant should be added
directly into the chiller is through the service valves on top of
the cooler condenser. if these valves are not accessible due to
presence of an attached pumpdown unit which does not have a
storage tank, slowly add charge through the valve connected to
the side of the condenser drain float sump. Adding charge
through the cooler refrigerant pumpout valve at the base of the
cooler (off the liquid line) may force debris into the condenser
float valve and is not recommended.
INITIAL START-UP
In order for the Reliance VFD to be eligible for the full
warranty period, the following conditions must be met:
1. The chiller must be started by a technician that has com-
pleted Reliance LiquiFlo2 training.
2. The start-up technician must be registered with Reliance.
3. The start-up technician must register the chiller start-up
on the Reliance web site.
Preparation — Before starting the chiller, verify:
1. Power is on to the CB2 control power circuit breaker, oil
pump relay, tower fan starter, oil heater relay, and the
chiller control center.
2. The CB1 main control center circuit breaker is in the On
position.
3. Cooling tower liquid is at proper level and at-or-below
design entering temperature. Check cooling tower bypass
valve.
4. Chiller is charged with refrigerant and all refrigerant and
oil valves are in their proper operating positions.
5. Oil is at the proper level in the oil sump sight glass.
6. The Oil Sump Temperature must be above 140 F (60 C)
or CALC EVAP SAT TEMP plus 15º F (8.3º C) before
the controls will allow the chiller to start to ensure that
a sufficient amount of refrigerant has been driven out of
the oil.
7. All valves listed on page CL-2 of the Initial Start-Up
Checklist are fully open.
8. The VFD cold plate refrigerant isolation valves are open.
9. Remove the control center shipping brace (see Fig. 39).
FRAME SIZE
COOLER
LENGTH
ft (m)
COOLER
CODE
CHARGE AMOUNT (R-134a)
WITH ECONOMIZER WITHOUT ECONOMIZER
lb (± 25 lb) kg (± 11 kg) lb (± 25 lb) kg (± 11 kg)
3
12
(3.6)
30 800 363 650 295
31 800 363 650 295
32 800 363 650 295
14
(4.3)
35 910 413 760 345
36 910 413 760 345
37 910 413 760 345
4
12
(3.6)
40 900 408 750 340
41 900 408 750 340
42 900 408 750 340
14
(4.3)
45 1015 460 865 392
46 1015 460 865 392
47 1015 460 865 392
5
12
(3.6)
50 1250 567 1100 499
51 1250 567 1100 499
52 1250 567 1100 499
14
(4.3)
55 1430 649 1280581
56 1430 649 1280581
57 1430 649 1280581
CAUTION
Operating the chiller with the shipping brace attached may
result in excessive vibration and noise. The shipping brace
should be removed to avoid possible equipment damage.