Carrier 16DF013-050 - Manual (Page 38)

CHARGING SOLUTION — Solution must be charged sepa-
rately into both the high-temperature generator and the ab-
sorber, while the hermetic pumps remain off. The should be
done very soon before the burner is to be started, and no
more than one day before initial burner operation. To mini-
mize chance of air entering the machine, the solution should
not be drawn directly from a small container. The vacuum
pump should remain in operation continuously while the so-
lution is being charged into the chiller.
1. Fully close the cooling/heating selection valve in the lower
part of the evaporator.
2. Connect a flexible hose to a 1 ⁄
2
-in. MPT adapter and a
1 ⁄
2
-in. pipe. The pipe should be longer than the height of
the solution container. Fill both pipe and hose with water
to minimize any air entry into the machine.
3. Insert the 1 ⁄
2
-in. pipe into the container (be sure it goes to
the bottom) and connect the flexible hose to the drain valve
(valve K), at the bottom of the high-temperature genera-
tor (Fig. 29).
4. Open the drain valve. Continue charging until solution
level is near bottom of container and quickly close the
valve. Do not allow air to be drawn into machine.
5. Repeat with other containers as required until the amount
specified in Table 13 has been charged into the high-
temperature generator.
6. Disconnect the hose from the generator drain valve, fill
the hose and pipe with water, and reconnect the hose to
the solution pump service valve.
7. Repeat previous steps, until the remaining solution charge
specified in Table 13 has been charged into absorber.
8. Remove the hose and immediately continue with the re-
frigerant charging.
INITIAL REFRIGERANT CHARGING — The refrigerant
charge must be either distilled or softened water. Do not use
tap water without first having it deionized or tested for the
following requirements:
pH
7.0 ± 0.2 at 77 F (25 C)
Hardness CaCO
3
2.0 ppm or less
Silica 0.2 ppm or less
Ammonia NH4 + None
Specific Resistance 5 x 10 to the fifth ohms/cm
at 77 F (25 C)
To charge refrigerant into the evaporator, fill clean solu-
tion containers with the distilled or softened water. Charge
the water through the refrigerant pump service valve, fol-
lowing the appropriate steps in Charging Solution section,
above.
Charge in at least the amount listed in Table 13 under Ini-
tial Refrigerant amount. This charge must be adjusted after
start-up to achieve optimal refrigerant overflow conditions
to limit the maximum solution concentration (which pre-
vents solution crystallization). However, any extra refriger-
ant charge should be limited because the normal refrigerant
pump discharge pressure is below atmospheric pressure and
a vacuum bottle is required to remove refrigerant (see Re-
frigerant Charge Final Adjustment section, page 40).
When the solution and refrigerant charging has been com-
pleted, power up the control circuit, turn on both hermetic
pumps, and operate the vacuum pump to remove any
noncondensables.
Table 13 — Nominal LiBr Solution and Refrigerant Charges
UNIT 16DF
SIZE
TOTAL LiBr HIGH-TEMPERATURE GENERATOR LiBr INITIAL REFRIGERANT
Gal. Kg Gal. Kg Gal. Kg
013,015 166 1015 83 508 60 240
018,020 211 1295 106 648 88 350
023,025 257 1575 129 788 100 400
028,032 349 2135 175 1068 125 500
036,040 423 2590 212 1295 143 570
045,050 514 3150 257 1575 116 460
Fig. 29 — Charging Solution and Refrigerant
38