Installation, Operation and Maintenance Manual
C13-Series
22
Subject to change without notice.
10.20-IM (0818)
Adjustment Of Hot Gas Bypass
Valve
The function of the hot gas bypass valve is to prevent the
suction pressure from falling below a per-determined set
point, thereby balancing the system� The set point is typically
104 psig (R-410a)�
Refer to the procedure below for Checking the Hot Gas
Bypass Valve before proceeding� This will help to establish
where the valve is currently set�
1�
Connect a low pressure refrigerant gauge to the suction
line�
2�
Operate 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 a 4 psi change�
Adjustments should be made in small increments,
allowing the system to stabilize after each turn�
5�
Vary the evaporator load to test at various conditions
that the suction pressure does not fall below the set
point (104 psig for R-410a)�
6�
Replace the seal cap on the hot gas bypass valve�
INFORMATION
NOTE:
7�
On split system applications the hot
gas bypass line to the evaporator
should be insulated to prevent
condensation�
8�
Use a wet rag around the hot gas
bypass valve when doing any brazing
Microprocessor Controller
For units controlled by a microprocessor refer to the specific
instructions for that device�
Humidifier
The optional steam humidifier that comes with the unit
functions on the electrode principle. As water fills the plastic
steam generator, it immerses metal electrodes which then
permits electrical current flow through the water. This current
flow produces heat which then boils the water into steam.
This steam is then injected on the downstream side of the
cooling coil to provide humidification for the area being
served by the unit� Water is replenished through tubing and
the 1/4" flare located on the evaporator coil panel structure.
For further information on operation refer to the Humidifier
Installation Instruction which accompanies the unit�
INFORMATION
NOTE: If the humidifier could be subjected
to below freezing conditions as the result
of outside air being introduced, the
humidifier should not be located inside the
unit air stream� Contact the factory for an
externally mounted humidifier.
Electric Heat
Electric heat is possible in two options� Option 1 is integrally
built into the unit in the return air as a factory supplied option�
A separate power supply is not required�
Option 2 is field supplied and installed in the form of a duct
heater� A duct heater must be installed a minimum of 4 feet
downstream from the unit in the evaporator discharge /
supply duct� A separate power supply will be required for the
duct heater�
Electric Reheat
On a call for dehumidification the compressor comes on
and the evaporator coil removes the moisture from the air
passing through it� The electric heater then reheats the air
passing through it to maintain the temperature in the space
that needs to be conditioned
Steam Coil
The steam coil is located in the return air� The coil is copper
tube/aluminum fin. Connections exit the cabinet at the
coil location� Standard steam coils and non-freeze steam
coils are available� Controls and valves for steam coils are
supplied by others�
Summary of Contents for C13-Series
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