MTD 248-604A Installationshandbuch PDF herunterladen (Seite 20)

Page 20 of 42 Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ IM 1083

A B C

Standard Static Pressure 1¼" 5/8" 2¾"

High Static 1½" 3/4" 3⅛"

Figure 36: Condensate Disposal Trapping Detail

9. Do not locate any point in the drain system above the drain connection

of any unit.

10. Automatic ow controlled devices must not be installed prior to

system cleaning and ushing.

11. A high point of the piping system must be vented.

12. Check local code for the need for dielectric ttings.

Table 10: Condensate Drain Trap & Static Pressure

7/8" I.D. Clear Plastic

Drain Pan (Left End)

Piping Considerations

1. All units should be connected to supply and return piping in a

two-pipe reverse return conguration. A reverse return system is

inherently self-balancing and requires only trim balancing where

multiple quantities of units with different ow and pressure drop

characteristics exist in the same loop. Check for proper water

balance by measuring differential temperature reading across the

water connections. To insure proper water ow, the differential ow

should be 10°F to 14°F (5°C to 8°C) for units in cooling mode.

A direct return system may also work acceptably, but proper water

ow balancing is more difcult to achieve and maintain.

2. The condenser water or loop piping can be steel or copper.

3. Supply and return runouts usually join the unit via short lengths of

high pressure exible hose which are sound attenuators for both

unit operating noise and hydraulic pumping noise. One end of the

hose should have a swivel tting to facilitate removal for service.

Hard piping can also be brought directly to the unit. This option is

not recommended since no vibration or noise attenuation can be

accomplished. The hard piping must have unions to facilitate unit

removal.

4. Some exible hose threaded ttings are supplied with sealant

compound. If not, apply Teon tape to assure a tight seal.

Note: Do not over-torque ttings. The maximum

torque without damage to ttings is 30 foot pounds.

If a torque wrench is not available, use as a rule of

thumb, nger-tight plus one quarter turn.

5. Supply and return shutoff valves are required at each conditioner.

The return valve is used for balancing and should have a “memory

stop” so that it can always be closed off but can only be reopened

to the proper position for the ow required.

6. No unit should be connected to the supply and return piping until

the water system has been cleaned and ushed completely. After

the cleaning and ushing has taken place, the initial connection

should have all valves wide open in preparation for water system

ushing.

7. Condensate drain piping can be steel, copper or PVC or CPVC.

8. The condensate drain hose must be trapped. The hose must be

pitched away from the unit not less than 1⁄4" per foot. The unit

drain pan has a 7/8 inch O.D. drain connection to accommodate

the condensate drain hose.

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