53
During mechanical cooling only mode of
operation, condenser water flows around the
waterside
economizer
coil
with
the
waterside economizer bypass valve fully
open. The condenser water then passes
through the water-cooled condenser and the
valves modulate to maintain head pressure.
Mineral content of the condenser water must
be controlled. All make-up water has
minerals in it and as the water is evaporated
in the cooling tower, these minerals remain.
As the mineral content of the water
increases, the conductivity of the water
increases.
Field provided and installed water treatment
program must be compatible with stainless
steel, copper, aluminum, ABS plastic, and
PVC. Batch feed processes should never be
used as concentrated chemicals can cause
corrosion. Never use hydrochloric acid
(muriatic acid) or chlorine as it will corrode
stainless steel.
Heating Coils
One or two row hot water heating coils can
be factory mounted. These coils are
supplied from a building hot water source.
The hot water coil is not connected to the
water-source condenser piping. All controls
for heating operation are field supplied and
field installed.
Always connect the steam heating supply to
the top of the coil and the return to the
bottom.
Figure 24 - Steam Distributing Piping
Table 6 – Steam Distributing Coil
Connection Sizes
Model (M2-)
Supply and Return
Connection Size
005 - 036
2 1/8"
Air handling units with steam heating coils
MUST BE
installed high enough to allow
for a minimum of 1 foot condensate drop leg
off of the steam coil, or as recommended by
the steam trap manufacturer. Lines should
be insulated with approved insulation and be
properly fastened, sloped, and supported
according to local code requirements.
Table 7 – Hot Water Coil Connection Sizes
Model (M2-)
Supply and Return
Connection Size
005
1 3/8"
008
1 5/8"
011, 014, 018
2 1/8"
022, 026, 032, 036
2 5/8"
Always connect the hot water heating supply
to the bottom of the coil and return to the
top.
Figure 25 - Hot Water Piping
Water coils should not be subjected to
entering air temperatures below 38°F to
prevent coil freeze-up. If air temperature
Summary of Contents for M2 Series
Page 2: ......
Page 5: ...5 Split System Piping Diagrams 98 M2 Series Startup Form 115 Maintenance Log 121 ...
Page 35: ...35 Table 1 Electric and Gas Heating Capacities ...
Page 38: ...38 Figure 5 M2 Series Unit Four Point Lifting ...
Page 39: ...39 Figure 6 M2 Series Unit Eight Point Lifting ...
Page 58: ...58 Figure 32 Supply Fan Banding ...
Page 95: ...95 Figure 52 Filter Layout Viewed from the Upstream Side of the Cooling Coil ...
Page 98: ...98 Split System Piping Diagrams Figure 53 A C Split System Piping Suction Down ...
Page 99: ...99 Figure 54 A C Split System Piping Suction Up ...
Page 100: ...100 Figure 55 A C with LAC Split System Piping Suction Up ...
Page 101: ...101 Figure 56 A C with Modulating Hot Gas Reheat Split System Piping Suction Down ...
Page 102: ...102 Figure 57 A C with Modulating Hot Gas Reheat Split System Piping Suction Up ...
Page 103: ...103 Figure 58 A C with Hot Gas Bypass Split System Piping Suction Down ...
Page 104: ...104 Figure 59 A C with Hot Gas Bypass Split System Piping Suction Up ...
Page 107: ...107 Figure 62 Heat Pump Split System Piping Suction Down ...
Page 108: ...108 Figure 63 Heat Pump Split System Piping Suction Up ...
Page 109: ...109 Figure 64 Heat Pump with Modulating Hot Gas Reheat Split System Piping Suction Down ...
Page 110: ...110 Figure 65 Heat Pump with Modulating Hot Gas Reheat Split System Piping Suction Up ...
Page 111: ...111 Figure 66 Heat Pump with Hot Gas Bypass Split System Piping Suction Down ...
Page 112: ...112 Figure 67 Heat Pump with Hot Gas Bypass Split System Piping Suction Up ...