Installation, Operation and Maintenance Manual
VertiCool Classic
22
Subject to change without notice.
20.10-IM (0617)
CAUTION
Confirm that any coil cleaning agents,
detergents or solutions are suitable for
use on a copper tube/aluminum fin coil. If
the cleaning agent is to acidic or alkaline,
damage to the coil fins may result.
Rinse all coils thoroughly after any coil cleaning�
Use a suitable fin comb after the coil cleaning to straighten
any bent fins.
Water Side Economizer Coil
If a unit contains the optional water side economizer coil it
may also require a periodic cleaning� These coils will need
to be cleaned using a chemical solution� These are available
commercially� Follow all manufacturer recommendations
and safety warnings�
Water Valves
At least once a quarter check the water vales to make sure
that no leaks are present� Look at the valve stem and all
piping joints�
If any leaks are found follow the manufacturers
recommendations for tightening any seals or replacing any
gaskets�
Hard Start Kit
A start assist device is utilized on all single phase units� The
purpose of this device is to assist the compressor in starting
under low voltage conditions�
A capacitor in conjunction with a Positive Temperature
Coefficient (PTC) relay is installed across the run and
start windings of the motor� The PTC device utilizes a
ceramic element with a predictable thermal response to
the introduction of electric current� When the compressor is
called upon to start, the start capacitor provides a voltage
boost to the start winding of the motor and causes the motor
to turn� As the starting current is introduced across the start
windings, the PTC element begins to warm� When the PTC
device reaches approximately 250° F (corresponding to 0�6
- 0�8 seconds), the resistance in the element increases and
creates an open switch that releases the start winding from
the circuit and the motor continues to run� If the compressor
does not start before the device heats to 250° F, it will not
start until the PTC device cycles through a cool-down period
(usually 2 - 3 minutes)� A compressor off-cycle timer is
included in the electrical circuit for this purpose�
The time delay also helps the refrigerant system pressures
to equalize at the end of the run cycle� This helps the
compressor during the starting process in that it is not
attempting to start against a high discharge pressure�
INFORMATION
Verify that this timer is set for 3 or more
minutes�
Checking Hot Gas Bypass Valve
1.
Connect a calibrated thermocouple lead to the outlet
line at the hot gas bypass valve� Tie wrap and insulate
the lead�
2.
Connect a low pressure refrigerant gauge to the suction
line�
3.
Connect a high pressure refrigerant gauge to the liquid
line�
4.
Operate the air conditioner in the cooling mode until the
system is stabilized� (Approximately 15 minutes)
5.
If the high side pressure is not at or above 400 psig,
block off the condenser inlet air stream until the
pressure is above this threshold� This will simulate
system performance level close to the design condition
of 95° F ambient�
6.
The hot gas bypass valve setting is 104 psig�
A.
If the suction pressure is 104 psig the
thermocouple reading should be approximately
117° F or higher� Please note that it may be
necessary to block off some of the evaporator air in
order to check this condition�
B.
If the suction pressure is above 104 psig the
thermocouple reading should be less than 117° F�
C.
If the suction pressure is below 104 psig the hot
gas bypass valve should be adjusted to raise the
pressure�
Adjustment Of Hot Gas Bypass Valve
The function of the hot gas bypass valve is to prevent the
suction pressure from falling below a predetermined set
point, thereby balancing the system� The set point is typically
104 psig (R-410a)�
1.
Connect a low pressure refrigerant gauge to the suction
line�
2.
Operate the air conditioner in the cooling mode until
system is stabilized� (Approximately 15 minutes)
3.
Remove the seal cap that covers the adjustment screw
of the hot gas bypass valve�
4.
Adjust the valve by turning the stem� A CLOCKWISE
turn will increase the pressure setting� A
COUNTERCLOCKWISE turn will decrease the
pressure setting� One complete turn is equal to
approximately 4 psi change�
Summary of Contents for VertiCool CLASSIC
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