Bryant 479 D - Manual (Page 6)

11. Remove chiller tank lids, and add contents of
chilled water package (one package to each chilled
water tank is sufficient).
12. Replace both chiller tank lids and reconnect con­
denser fan motor leads in the chiller control boxes.
13. Turn on water pumps. Pumps should operate a
minimum of 10 minutes to dissolve all chilled water
additive when chilled water additive is used.
14. Replace access panels and tirrn on manual gas
valves to both chillers. Cooling section is now ready to
operate.
Corrosion Protection
The metallic components of the chilled water system
must be protected from corrosion by the addition of
an inhibitor to the chilled water circuit of each chiller.
Two packages of chilled water additive are furnishèd
with the unit. The contents of one package of Chilled
Water Additive P/N 62875D1 must be added to the
chilled water circuit of each chiller when water only
or when water and methanol antifreeze are used in
the chilled water system.
Do not add any chilled water additive to the system
when Ucar-17 is used for freeze protection. Ucar-17
contains sufficient inhibitor when used in the recom­
mended concentrations as shown in Table III.
Freezing Weather Protection
Freeze protection is only required when the chilled
water coil is subjected to freezing temperatures or
when the unit is to operate under freezing conditions.
The cooling section is equipped with galvanized
chillers. Ucar-17 is the only permanent (glycol-base)
antifreeze approved for use in the chilled water
system. When Ucar-17 is used for freeze protection,
the minimum concentration must be 33% by volume.
Table III gives the types of antifreeze, percent of an­
tifreeze concentration, and amount of antifreeze to
use in each chiller of the 180 and 240-479 at various
outdoor temperatures.
VII. START-UP AND ADJUSTMENTS
Important: Before starting the heating or cooling sec­
tion, make certain all electrical connections have been
made and the gas piping has been connected, purged
and leak tested.
CAUTION; Recheck all factory and field connections,
making sure they are tight.
Pilot Adjustment
Remove necessary access panels from furnace and
chillers.
Light pilots according to instructions on furnace and
chillers.
For Natural Gas. Flame should be of sufficient length
to provide good impingement on the monometal of the
Bryant pilot. The flame should extend upward bet­
ween the carryover ports of the two adjacent burners.
For Propane Gas. Flame should surround tip of the
thermocouple element of the pilot and extend down­
ward to include 3/8” to 1/2” of the thermocouple. The
flame must not come in contact with any other part of
the thermocuple or its lead wire. The flame lies under
the carryover ports of the burners and merges with the
carryover flames.
The pilot flame can be adjusted if it does not have the
appearance described above. The pilot adjusting
screw for natural and propane units (chillers and fur­
nace) is located under a screw cap in the handle of the
manual pilot shut off valve. Adjust as follows;
1. Remove the screw cap to expose the adjusting
screw, then turn pilot flame to full on position.
2. Turn the adjusting screw until the flame has the
desired appearance.
TABLE III
APPROVED ANTIFREEZE TYPES
Amount Required (Galions)
Lowest Outdoor Percent of Concentration 180-479 (Each Chiiier) 240-479 (Each Chiller)
Temperature (°F) ^Methanol **Ucar-17 Methanol Ucar-17 Methanol Ucar-17
20 20 33 2-1/2 4-1/4 2-3/4 4-1/2
15 20 33 2-1/2 4-1/4 2-3/4 4-1/2
10 22 33 2-3/4 4-1/4 3-1/4 4-1/2
5 26 33 3-1/4 4-1/4 3-3/4 4-1/2
0 29 33 3-3/4 4-1/4 4 4-1/2
-5 32 36 4 4-1/2 4-1/2 5
'10 34 39 4-1/4 4-3/4 4-3/4 5-1/4
-15 36 42 4-1/2 5-1/4 5 5-3/4
-20 38 45 4-3/4 5-1/2 5-1/4 6-1/4
-25 43 47 5-1/4 5-3/4 6 6-1/2
-30 44 49 5-1/2 6 6 6-3/4
^Chilled water Additive (Borax and Chromate) P/N 62875D1 must also be used. Refer
to “Corrosion Protection” on page 6.
**No chilled water additive required. Refer to “Corrosion Protection” on page 6.
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