Carrier 50HQP072-120 specifications Removing Panels

FRONT

RETURN AIR

REMOVE MOTOR

AND BLOWER SHEAVE

ADJUSTING BOLT

a50-8538	REMOVE BLOWER PANEL
	AND ACCESS PANEL

Fig. 6 — Removing Panels

REMOVE 4 MOTOR BOLTS

a50-8540

Fig. 8 — Removing Motor

MOTOR SLIDE NUTS

MOTOR CLIPS

a50-8539

Fig. 7 — Removing Belt

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.

7

a50-8541

BOLTS

Fig. 9 — Removing Blower Assembly

•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.