McQuay TGZ 040, Руководство по эксплуатации и обслуживанию, Страница: 3 / 84

OMM TGZ-1 TGZ 040A through TGZ 190A 3
Introduction
General Description
McQuay Type TGZ water heaters are scroll compressor refrigeration units that recover heat from warm
fluid streams in the evaporator and deliver hot water, at a useful temperature, from the condenser to a
heating load. They are designed for indoor installations only and are completely assembled, wired,
charged and tested. Each unit consists of four or six (depending on unit size) scroll compressors,
brazed-plate evaporators on models 040 to 120 and shell-and-tube evaporators on models 150 to 190,
shell-and-tube condenser/heater, and complete refrigerant piping.
There are two refrigerant circuits, each with manual liquid line shutoff valves, charging valves, filter-
driers, liquid line solenoid valves, sightglass/moisture indicators, and expansion valves (thermal on
TGZ 040-120, electronic on TGZ 150-190.
The electrical control center includes a MicroTech II control system and other components necessary
for dependable automatic operation.
NOTE: Additional information not included in this manual, such as unit dimensions and weights,
physical data, and performance data can be found in
Catalog Templifier-1
.
Nomenclature
T G Z 100 A
Water Pressure Drop
The vessel flow rates must fall between the minimum and maximum values shown on the appropriate
evaporator and condenser curves on pages 4 through 6. Flow rates below the minimum values shown will
result in laminar flow that will reduce efficiency, cause erratic operation of the expansion valve and could
cause low temperature cutoffs. On the other hand, flow rates exceeding the maximum values shown can cause
erosion on the evaporator water connections and tubes.
Measure the water pressure drop through the vessels at field installed pressure taps. It is important not to
include valves or strainers in these readings.
The condenser flow rate will determine whether 2-pass or 4-pass condensers are used, according to the
following table:
CONDENSER DELTA-T PASSES FLOW
10- to 20 Degrees F 2-Pass High Flow Rate
20 to 40 Degrees F 4-Pass Low Flow Rate
The entering water should be piped to the bottom connection of the condenser and out the top.
Templifier
Global
Scroll Compressor
Vintage
Nominal Evaporator
Capacity in Tons