Carrier PTV, 50PTH Typical Downflow Installation, 50PTD Unit, Conversion Right Return

Supply Air
	Building
Flexible	Loop
Connection
	Water
	Out
	Water
	In	Balancing Valve
Stainless steel		(field-installed
braid hose		accessory)
with integral
“J” swivel
(field-installed		Low Pressure
accessory)
		Drop Water
Power
		Control Valve
Thermostat		(optional)
		(field-installed
Wiring		accessory)

	Ball Valve with optional
Compressor	integral P/T plug
	(typical for supply and
Access Panel
	return piping) (field-Installed
	accessory)

NOTE: Ball valve with integral pressure temperature plug recommended.

Fig. 5 — Typical Vertical Installation — 50PTV Unit

•Provide adequate clearance for filter replacement and drain pan cleaning. Do not block filter access with pip- ing, conduit or other materials. Refer to Fig. 1, 3, and 4 for dimensional data.

•Provide access for fan and fan motor maintenance and for servicing the compressor and coils without removing the unit.

•Provide an unobstructed path to the unit within the closet or mechanical room. Space should be sufficient to allow removal of the unit, if necessary.

•In limited side access installations, pre-removal of the control box side mounting screws will allow control box removal for future servicing.

•Provide access to water valves and fittings and screw- driver access to the unit side panels, discharge collar and all electrical connections.

NOTE: Correct placement of the horizontal unit can play an important part in minimizing sound problems. Since duct- work is normally applied to these units, the unit can be placed so that the principal sound emission is outside the oc- cupied space in sound-critical applications. A fire damper may be required by the local code if a fire wall is penetrated.

Power

Thermostat

Wiring

Compressor

Access Panel

Flexible	Building
Connection	Loop
	Water	Water
	Out
Stainless		In
steel
braid hose
with		Balancing Valve
integral ”J”		(field-installed
swivel(field-		accessory)
installed		Low Pressure
accessory)		Drop Water
		Control Valve
		(optional)
		(field-installed
		accessory)
		Ball Valve with
Flexible		optional integral
		P/T plug (typical for
Connection
		supply and return

Supply Air	piping)(field-installed
	accessory)

FIELD CONVERSION OF DISCHARGE AIR — The dis- charge air of the 50PTH horizontal units can be converted between side and back discharge in the field. The conversion process is the same for right and left return configurations. See Fig. 7 and 8.

NOTE: It is not possible to convert return air between left or right return models in the field due to refrigerant piping changes.

Water

Connection End

Return Air

Supply

Duct

Side Discharge	Water
	Connection End

NOTE: Ball valve with integral pressure temperature plug recommended.

Fig. 6 — Typical Downflow Installation —

50PTD Unit

Return Air

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

•	Units are for indoor use only.
•	Locate in areas where ambient temperatures are between
	39 F and 102 F and relative humidity is no greater than

Drain

Discharge Air

Back Discharge

	75%.
•	Provide sufficient space		for water, electrical and duct
	connections.
• Locate unit in an area that allows easy access and removal
	of filter and access panels.
•	Allow enough space	for	service personnel to perform
	maintenance.
• Return air must be able to freely enter the space if unit needs
	to be installed in a confined area such as a closet.
• Install the unit on a piece of rubber, neoprene or other
	mounting pad material for sound isolation. The pad
	should be at least 3/	in. [10 mm] to 1/ in. [13 mm] in
	8		2
	thickness. Extend the pad beyond all four edges of the
	unit.

Fig. 7 — Conversion Right Return,

Side Discharge to Back Discharge

Preparation — The unit should be on the ground in a well lit area. Hung units should be taken down to ground level before converting.

Side to Back Discharge Conversion

1.Remove screws to free the top and discharge panels. Set screws aside for later use. See Fig. 8.

2.Remove the access panel and set aside.

3.Lift the discharge panel from side of unit and rotate it to back using care not to damage blower wiring.

4.Check blower wire routing and connections for undue tension or contact with sheet metal edges. Re-route if necessary.

8