Altec AIR MHT Series, Руководство пользователя

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DESCRIPTION OF COMPONENTS - UA/MHT SERIES
(1) HEAT EXCHANGER MODULE - The compact aluminum module contains the air to air heat exchanger, the
air to refrigerant heat exchanger and the stainless steel mesh condensate separator.
(2) REFRIGERANT COMPRESSOR – The main function of the compressor is to circulate the refrigerant.
The compressor pumps refrigerant to the other components in the system so they can perform heat
transfer functions. The compressor also separates the high pressure from the low pressure side of the
refrigeration system .
(3) AIR-COOLED CONDENSER – One of the main functions of the condenser is to condense the high
pressure and high temp refrigerant vapor to liquid. A heavy duty fan moves ambient air across the
condenser coils removing heat from the refrigerant vapor. As the heat is removed the refrigerant
vapor the temperature change causes the refrigerant to change state from a vapor to a liquid. The
condenser is made from aluminum fins attached to copper tubes.
(4) FLTER-DRIER – Adsorbs and filters out any moisture or debris that maybe in the refrigeration
system. Moisture can cause freeze ups and dirt particles can plug capillary tubes causing system
malfunctions.
(5) TEMPERATURE EXPANSION VALVE (TXV) – The metering device meters liquid refrigerant from the
liquid line to the evaporator. Separates the high pressure side from the low pressure side in the
refrigeration system. Installed on UA400/MHT200 and above. Capillary Tube Unit installed on UA300/
MHT150 and below.
(6) HOT GAS BYPASS VALVE (HGBV)– The HGBV responds to changes in suction pressure. As the
compressed air flow (Or heat load) on the dryer changes the suction pressure will change. An
increase in air flow causes an increase in suction pressure a decrease in air flow causes a decrease in
suction pressure. During periods of low air flow the HGBV meters hot gas from the hot gas line of the
high side to the inlet of the heat exchanger.
(7) LP1 - LOW PRESSURE SAFETY CUT OUT – Prevents damage to the refrigerant compressor in the
event of a refrigerant leak or low refrigerant pressure. Installed on UA200A-3/MHT130A-3 & UA250-
2/MHT150A-2 and above
(8) PS1— HIGH PRESSURE SAFETY SHUTDOWN w/MANUAL RESET - Prevents damage to the
refrigerant compressor and other components in the event of high refrigerant pressure due to fan
motor failure, dirty condenser or over capacity. Installed on UA150/MHT100 and above.
(9) FS1 FAN CYCLING SWITCH – Cycles the condenser fan motor on and off to maintain the proper
condensing pressure dryer periods of fluctuating loads and ambient conditions. Installed on UA400/
MHT200 and above.
(10) FS2 FAN CYCLING SWITCH – Cycles the condenser fan motor on and off to maintain the proper
condensing pressure dryer periods of fluctuating loads and ambient conditions. Installed on UA400/
MHT200 and above.
(11) SUCTION PRESSURE GAUGE – Continuously monitors the refrigerant suction or low side pressure.
Is used as a troubleshooting device. Installed on UA75/MHT40 and above.
(12) REFRIGERATION DISCHARGE PRESSURE GAUGE - Continuously monitors the refrigerant
discharge or high side pressure. Is used as a troubleshooting device. Installed on UA400/MHT200 and
above.
(13) CONDENSER FAN MOTORS – Drives ambient air over condenser coils.
(14) Y-STRAINER AND SHUTOFF VALVE — Allows for easy service and cleaning of the drain valve
(15) PROGRAMMABLE AUTO CONDENSATE DRAIN— Reliably drains away the moisture that was
removed from the air by the dryer.