7
7. Mount motor, motor sheave, blower sheave and belt.
Make sure wires are not pinched and not over sharp edg-
es. Adjust motor downward to tighten belt. Raise or lower
motor slide assembly with adjusting bolt and retighten the
2 slide nuts. Check for correct tension. Rewire motor (at
contactor) for correct rotation. Spin blower wheel to en-
sure wheel is not obstructed.
8. Replace panels from Step 1.
BACK TO SIDE DISCHARGE CONVERSION — If the
discharge is changed from back to side, use the above instruc-
tions. Note that figures will be reversed.
LEFT OR RIGHT RETURN UNITS — It is not possible to
field convert return air between left or right return units due to
the necessity of refrigeration copper piping changes. However,
the conversion process of side to back or back to side discharge
for either right or left return configuration is the same. In some
cases, it may be possible to rotate the entire unit 180 degrees if
the return air connection needs to be on the opposite side. Note
that rotating the unit will move the piping to the other end of
the unit.
Step 8 — Install Piping Connections — Depend-
ing on the application, there are 3 types of WSHP piping sys-
tems to choose from: water loop, ground-water and ground loop.
Refer to the Carrier System Design Manual for additional infor-
mation.
All WSHP units utilize low temperature soldered female
pipe thread fittings for water connections to prevent annealing
and out-of-round leak problems which are typically associated
with high temperature brazed connections. Refer to Table 1 for
connection sizes. When making piping connections, consider
the following:
• A backup wrench must be used when making screw con-
nections to unit to prevent internal damage to piping.
• Insulation may be required on piping to avoid condensa-
tion in the case where fluid in loop piping operates at
temperatures below dew point of adjacent air.
• Piping systems that contain steel pipes or fittings may
be subject to galvanic corrosion. Dielectric fittings may
be used to isolate the steel parts of the system to avoid
galvanic corrosion.
• Do not allow hoses to rest against structural building
components. Compressor vibration may be transmitted
through the hoses to the structure, causing unnecessary
noise complaints.
Figure 10 shows a typical supply/return hose kit assembly.
WATER LOOP APPLICATIONS — Water loop applications
usually include a number of units plumbed to a common pip-
ing system. Maintenance to any of these units can introduce air
into the piping system. Therefore, air elimination equipment
comprises a major portion of the mechanical room plumbing.
The flow rate is usually set between 2.41 and 3.23 L/m per
kW of cooling capacity. For proper maintenance and servicing,
pressure-temperature (P/T) ports are necessary for temperature
and flow verification.
In addition to complying with any applicable codes, consid-
er the following for system piping:
• Piping systems utilizing water temperatures below
10 C require 13 mm closed cell insulation on all piping
surfaces to eliminate condensation.
REMOVE BLOWER PANEL
AND ACCESS PANEL
RETURN AIR
FRONT
Fig. 6 — Removing Panels
a50-8538
Fig. 7 — Removing Belt
a50-8539
REMOVE MOTOR
AND BLOWER SHEAVE
ADJUSTING BOLT
REMOVE 4
MOTOR BOLTS
Fig. 8 — Removing Motor
a50-8540
Fig. 9 — Removing Blower Assembly
a50-8541
