McQuay SWT C Series, Руководство по установке и обслуживанию

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6 IM709
Field Mounting of Sensors
Units with fan section shipped separate
(code 21=*M)
The following items require field connection or mounting
when the fan section is shipped separate:
• Fan Motor(s) power harness(es) need to be connected to
the OL10 overload(s) on the control board. The power har-
ness is located in the fan section with one end connected to
the fan motor. The other end of the power harness needs to
be connected to the control panel. Three penetration hole are
provide to the control panel. The holes are pre-punched in
the upper right hand side of the control panel when facing
the control panel. Select one of the holes and cut out the
insulation. Mount the power harness conduit fitting in the
hole. Connect the three fan power wires to the leaving side
of the OL1 0 overload.
• Supply Air Sensor — The sensor will be shipped
loose in the main cooling/heating section on the right side
when facing the control panel. The sensor will be labeled
SAT. Move the SAT sensor into the fan section. The mount-
ing location is on the right side of the fan section when fac-
ing the unit front. The mounting hole is labeled SAT on a
plate at the bottom of the fan.
• Duct High Limit Tube — The tube is shipped loose in
the main cooling/heating section on the left side when facing
the unit front. The tube is labeled DHL. The duct high limit
tube should be mounted on the left side of the fan section
regardless of front or back discharge. The mounting location
is labeled DHL TUBE on the flex duct metal. Place tube and
holder through flex duct assembly and screw locking nut on
the inside of the fan.
• VIV (optional) actuator and feedback potenti-
ometer
control wire need to be connected. The VIV control
wiring penetrates the control board in the upper left corner
when facing the front of the unit. The connectors from the
control board are shipped loose in the main cooling/heating
section. The connectors from the VIV actuator are shipped
loose in the fan section. The control wire coming from the
actuator motor has a socket connector which matches the
prong connector from the control panel. The control wire for
the feedback potentiometer has a prong connector which
matches the socket connector from the control panel. This
logic of prong and socket connections prevents cross wiring
of the actuator motor and feedback potentiometer control
wiring.
Units ordered for modular construction
(code 32=1)
Right side of unit
The following items require field connection or mounting in
the filter/waterside economizer section. Each item is shipped
loose in the main cooling/ heating section. The four items are
located on the right side of the section when facing the front
of the unit. A hole is provided leaving the main cooling/heat-
ing section entering the filter/waterside economizer section.
Each item needs to be threaded through this hole into the fil-
ter/waterside economizer section. The mounting location of
the four items is the space after the filters and before the
coils. The following provide mounting hole locations for
each item:
• Mixed Air Sensor - Identify the sensor labeled MAT.
Mount the sensor in the 2nd hole from the top labeled MAT.
• Plastic Tube for Air Flow and Clogged Filter
Switch - The tube for pressure sensing on the Proof of Air
Flow Switch (PC7) and the Clogged Filter Switch (PC5) is
labeled PC5/PC7.
•
Freezstat—
If the optional Freezstat is ordered its con-
trol wiring must be connected. Plug the control wiring into
the freezstat mounted on the top hole.
Left or right side of unit
The following items are located on the same side of the unit
as the water piping connections. The water piping connec-
tions may be ordered right or left hand. Each of these items
requires field mounting or connections.
• Mount the EWT and LWT temperature sensors in the
filter/waterside economizer section. The sensors are shipped
loose on the bottom of main cooling/heating section on the
side of the water connections. Identify the sensor labeled
EWT and mount to the holder at the bottom the entering
water tube. The entering water tube is the bottom tube and is
labeled at the point it penetrates the unit. Identify the sensor
labeled LWT and mount to the holder at the bottom of the
leaving water tube. The leaving water tube is above the
entering water tube and is labeled at the point it penetrates
the unit.
• Connect the control wiring for the valve(s) actuator and
feedback potentiometer which control the water flow
through the waterside economizer (optional) and condenser.
The wire connectors from the control board are shipped
loose in the base of the main cooling/heating section. The
wire connectors from the valve actuator(s) are shipped loose
in the base of filter/waterside economizer section. The con-
trol wire coming from the actuator motor has a socket con-
nector which matches the prong connector from the control
panel.
If there is more than one actuator motor, the wire
number on the socket connector must match the wire number
on the prong connector. If the wire numbers are not matched,
the valves will not be controlled properly.
The control wire
for the feedback potentiometer has a prong connector which
matches the socket connector from the control panel. This
logic of prong and socket connections prevents cross wiring
of the actuator motor and feedback potentiometer control
wiring.