Bryant 452W - Manual (Page 7)

remove screw cap to expose adjustable screw.
Turn adjusting screw until flame has desired
appearance,
b. Replace screw cap.
V. CHILLED-WATER SYSTEM
CAUTION: Do nol run the pump dry. Freezing con­
ditions will not damage the pump; however, do mu at­
tempt to operate the pump when i-hiller or chilled-
water lines are h'ozen.
Corrosion Protection
The components of the chilled-water circuit must be
protected from corrosion by the addition of an
inhibitor to the chilled-water system. Chilled-Water
Additive P/N 62875D1 must be added when water
only, or when water and methanol antifreeze, are used
in the chilled-water system.
The package of Chilled-Water Additive P/N 62875D1
supplied with the unit is sufficient for systems con­
taining up to 15 gallons. For systems larger than 15
gallons, add one package for each additional 15-
gallon capacity or fraction thereof. To estimate the
capacity of the chilled-water system, refer to Table
III.
TABLE III
Water Capacity in Gallons
TABLE V
90-452W Chiller 9.7
Bryant 18,000-Btuh Coil 0.6
Bryant 36,000-Btuh Coil 1.0
Bryant 48,000-Btuh Coil 1.25
Bryant 90,000-Btuh Coil 2.5
1 ft of 1-inch pipe 0.05
1 ft of 1-1/4-inch pipe 0.08
1 ft of 1-1/2-inch pipe 0.11
CAUTION: l)i> Ilf' .tdil ; n> ■ hillid-« ;iu i :nltliii\i
when Ucar-17 is used for freeze proieetion. Ucar-I7
contains adequate inhibitor when used in the recom­
mended concentration as shown in Tables IV and \'.
Freezing Weather Protection
Freeze protection is normally required only on those
systems that
(a) Use hard piping (copper and galvanized)
(b) Use polyethylene tubing without sufficient
length of tubing in conditioned space.
TABLE IV
Antifreeze
^Minimum
Concentration
(Percent of Voiume)
Type
Chilled-
Water Additive
Methanol 20
Borax & Chromate
(P/N 62875D1)
Ucar-17 33
None^
(See Note 1)
Lowest Winter
Outdoor
Temperature (°F)
Percent of Antifreeze
Concentration (% of Vol.)
Ucar-17 Methanol
20 33 20
15 33 20
10 33 22
5 33 26
0 33 29
-5 36 32
-10 39 34
-15 42 36
-20 45 38
-25 47 43
-30 49 44
*For protection at various outdoor ambients, refer to Table V.
NOTE 1—^Ucar-17 is the only approved type of permanent (glycol-
base) antifreeze recommended for freeze protection of Model 90-
452W Chiller.
(c) Must be operated dtiring winter as well as
summer.
(d) Have cooling coil located in unheated area
where freezing could occur, such as rooftop
unit.
Table IV lists the minimum amount of concentration,
and the type of chilled-water additive to use when
required.
Adjusting Chilled-Water Level
1. Turn off gas at main manual shutoff valve and
turn off electrical power at disconnect switch.
WARNING: To prevent bodily iiijnry. di.sconnecr con-
dejKser fans motor leads in the connol box.
2. Remove left-side access panel, then remove hand
hole cover located on top of chiller tank. See
Figure 8.
3. Disconnect water line at chiller inlet. (When in­
stalling chilled-water lines, it is advisable to
leave this connection open until lines have been
flushed.)
4. Fill tank with tap water until distributor pan at
top is covered with water. A garden hose is useful
for this operation.
5. Turn on electrical power to unit and start pump.
Continue to supply water to tank and operate
pump until all foreign matter has been flushed
from lines, then remove garden hose.
6. Turn off pump. Reconnect water line at chiller
inlet.
7. Add water to tank until tank is approximately
half full. Replace hand hole cover.
8. Start pump and check for leaks.
9. Adjust operating water level with piunp running.
This is accomplished by removing drain plug.
Operating water level is properly adjusted when
water ceases to flow from drain opening. Replace
drain plug and turn off pump.
10. Refer to section on “Freezing Weather Protec­
tion” on page 7. If freeze protection is not
required, omit Steps 11 and 12, and proceed with
Step 13. If freeze protection is required, decide on
— 7 —