Carrier 50PSW036-360 Typical Water Loop System, Boiler, Tower, or Ground Sizes 180,360 Shown

8.Remove any access panel screws that may be difficult to remove once unit is installed.

Step 3 — Locate Unit — The following guidelines should be considered when choosing a location for the WSHP:

•Units are for indoor use only.

•Provide sufficient space for water and electrical connections.

•Locate unit in an area that allows for easy access and removal of access panels.

•Allow enough space for service personnel to perform maintenance.

Step 4 — Mount Unit — Mount unit as shown in Fig. 3. Rod attachments must be able to support the weight of the unit. See Table 1 for unit operating weight.

In all applications, the quality of the water circulated through the heat exchanger must fall within the ranges listed in the Water Quality Guidelines table. Consult a local water treat- ment firm, independent testing facility, or local water authority for specific recommendations to maintain water quality within the published limits.

WATER LOOP APPLICATIONS — Water loop applica- tions usually include a number of units plumbed to a common piping 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 2.9 L/m and 3.9 L/m per kW of cooling capacity. For proper maintenance and ser- vicing, pressure-temperature (P/T) ports are necessary for tem- perature and flow verification.

Source Connections (Boiler/Tower/Ground)

Load Connections (Hot	Automatic Flow
Water/Chilled Water)
	Regulator
	Ball Valve
	with Pressure
	Temperature Port

Ball Valve

with Pressure

Temperature Port

Y Strainer with

Blow Down Valve

Power

Disconnect

In addition to complying with any applicable codes, consid- er the following for system piping:

• Piping systems utilizing water temperatures below

10.0 C require 13 mm closed cell insulation on all piping

surfaces to eliminate condensation.

• All plastic to metal threaded fittings should be avoided

due to the potential to leak. Use a flange fitted substitute.

• Teflon* tape thread sealant is recommended to minimize

internal fouling of the heat exchanger.

• Use backup wrench. Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• The piping system should be flushed prior to operation to

Control	a50-8138
Wiring

Fig. 3 — Typical Water Loop System —

Boiler, Tower, or Ground (Sizes 180,360 Shown)

Step 5 — Connect Piping — Depending on the appli- cation, there are 3 types of WSHP piping systems to choose from: water loop, ground-water and ground loop. Refer to the Carrier System Design Manual for additional information.

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. When making pip- ing 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.

•Units may be manifolded together via top water connects to get increased temperatures, when piped in series, or greater capacity, when piped in parallel.

WATER SUPPLY AND QUALITY — Check water supply. Water supply should be plentiful and of good quality. See Table 2 for water quality guidelines.

IMPORTANT: Failure to comply with the above required water quality and quantity limitations and the closed- system application design requirements may cause damage to the tube-in-tube heat exchanger that is not the responsi- bility of the manufacturer.

remove dirt and foreign materials from the system.

Cooling tower/boiler systems typially use a common loop maintained between 16 and 32 C. The use of a closed circuit evaporative cooling tower with a secondary heat exchanger be- tween the tower and the water loop is recommended. If an open type cooling tower is used continuously, chemical treatment and filtering will be necessary.

GROUND-WATER APPLICATIONS — In addition to complying with any applicable codes, consider the following for system piping:

•Install shut-off valves for servicing.

•Install pressure-temperature plugs to measure flow and temperature.

•Boiler drains and other valves should be connected using a “T” connector to allow acid flushing for the heat exchanger.

•Do not overtighten connections.

•Route piping to avoid service access areas to unit.

•Use PVC SCH80 or copper piping material.

NOTE: PVC SCH40 should not be used due to system high pressure and temperature extremes.

GROUND-LOOP APPLICATIONS — Temperatures be- tween –3.9 and 43.3 C and a cooling capacity of 2.9 L/m and

3.9L/m per kW are recommended. In addition to complying with any applicable codes, consider the following for system piping:

•Piping materials should be limited to only polyethylene fusion in the buried sections of the loop.

•Galvanized or steel fittings should not be used at any time due to corrosion.

•All plastic to metal threaded fittings should be avoided due to the potential to leak. Use a flange fitted substitute.

•Do not overtighten connections.

•Route piping to avoid service access areas to unit.

•Pressure-temperature (P/T) plugs should be used to mea- sure flow of pressure drop.

*Teflon is a trademark of E. I. du Pont de Nemours and Company.

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