76
OM
AGSD-1
Start-up After Extended (Seasonal) Shutdown
1.
With all electrical disconnects locked and tagged out, check all screw or lug-type
electrical connections to be sure they are tight for good electrical contact.
Caution
LOCK AND TAG OUT ALL POWER SOURCES WHEN CHECKING
CONNECTIONS. ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL
INJURY OR DEATH.
2.
Check the voltage of the unit power supply and see that it is within the
±
10% tolerance
that is allowed. Voltage unbalance
between
phases must be within
±
3%.
3.
See that all auxiliary control equipment is operative and that an adequate cooling load is
available for start-up.
4.
Check all compressor flange connections for tightness to avoid refrigerant loss. Always
replace valve seal caps.
5.
Make sure system switch Q0 is in the "Stop" position and pumpdown switches Q1 and
Q2 are set to "Pumpdown and Stop", throw the main power and control disconnect
switches to "on." This will energize the crankcase heaters. Wait a minimum of 12 hours
before starting up unit. Turn compressor circuit breakers to "off" position until ready to
start unit.
6.
Open the optional compressor suction butterfly as well as the liquid line shutoff valves,
compressor discharge valves.
7.
Vent the air from the evaporator water side as well as from the system piping. Open all
water flow valves and start the chilled water pump. Check all piping for leaks and
recheck for air in the system. Verify the correct flow rate by taking the pressure drop
across the evaporator and checking the pressure drop curves in the installation manual,
IMM AGSC-2.
8.
The following table gives glycol concentrations required for freeze protection.
Table 6, Freeze Protection
Percent Volume Glycol Concentration Required
For Freeze Protection
For Burst Protection
Temperature
°
F (
°
C)
Ethylene Glycol
Propylene Glycol
Ethylene Glycol
Propylene Glycol
20
(6.7)
16 18 11 12
10
(-12.2)
25 29 17 20
0
(-17.8)
33 36 22 24
-10
(-23.3)
39 42 26 28
-20
(-28.9)
44 46 30 30
-30
(-34.4)
48 50 30 33
-40
(-40.0)
52 54 30 35
-50
(-45.6)
56 57 30 35
-60
(-51.1)
60 60 30 35
Notes
:
1.
These figures are examples only and cannot be appropriate to every situation. Generally, for an extended
margin of protection, select a temperature at least 10
°
F lower than the expected lowest ambient temperature.
Inhibitor levels should be adjusted for solutions less than 25% glycol.
2.
Glycol of less than 25% concentration is not recommended because of the potential for bacterial growth and
loss of heat transfer efficiency.
Summary of Contents for AGS 225D
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