Hi-Velocity RPM-E-100 Installationshandbuch - Seite 6

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Hi-Velocity RPM-E-100 Installationshandbuch

Troubleshooting the TXV

When issues arise that bring the function of the TXV into

question, factors must be looked into before replacement. Inspect

the TXV for signs of damage. This may be from a pinched

equalizer line to a burnt valve. These issues will have an adverse

affect on the operation of the valve. Should the equalizer line be

pinched, the valve will no longer be able to supply the proper

amount of refrigerant to the coil. A burnt valve may have an

effect on the refrigerant charge of the TXV bulb or the seal of the

valve. This may again cause an improper amount of refrigerant

to be metered by the valve or cause the valve head to become

seized.

The TXV bulb location and mounting should also be inspected.

The bulb should be securely mounted on the top half of the

suction line. If the bulb is loose or on the lower half of the line,

the bulb will not properly sense the refrigerant temperature and

will not meter the proper amount of refrigerant. Ensure that the

bulb is also properly insulated, as a lack of insulation will expose

the bulb to conditions well outside those of the coil. This will

cause an overfeed of refrigerant to the system.

Should the installation of the valve be proper, and no damage

is evident, inspect the operation of the valve. If the TXV bulb

is removed and held in ones hand, the valve should react

accordingly. This sudden increase in heat will open the valve.

This will cause a rise in suction pressure and a drop in liquid

pressure. Should nothing happen, the valve is likely seized and

will need to be replaced.

Short Cycling

Short cycling is the unnecessary running of the indoor

Specifications

Matching Fan Coil

Part Number

Refrigerant Type

TX Cooling MBH

Latent Cooling MBH

Fin Material

Tubing Material

Type of Fins

Connection Sizes

TXV with Built in Check Valve & Bypass

Site Glass

Access Ports

Freeze Stat

Shipping Weight (lbs)

Module Size (L x W x H)

Tons

MBH = Thousand British Thermal Units per Hour

1) Smaller condensers may be matched to the fan coil when needed (match TXV to condenser size)

2) Minimum of 8 full 2" (51mm) outlets per ton of cooling needed (4 outlets for HE)

www.hi-velocity.com

HE-Z/HE/HV - 50 / 51 / 52

Liquid Line (Lq)

Suction Line (S)

Drain Connection

(489mm x 371mm x 470mm)

1.5 - 2.0

TX = Thermal Expansion

Module RPM Refrigerant Module Installation (RPM-E) (5/5)

and outdoor unit, on and off. This often takes the form of very

short and frequent on cycles. There are many factors that may

contribute to short cycling of the refrigerant system. These issues

can generally be broken down between airflow related issues,

refrigerant issues, and installation issues.

Low airflow rates are one of the most common causes of short

cycling. As the airflow rate is lowered across the cooling coil,

the coil pressure drops along with it. This lowers the temperature

of the coil and may cause the freeze-stat to trip. As the system

settles, the freeze-stat closes and the cycle begins again, as the

unit does not run long enough for the space to become adequately

conditioned. Ensure that the proper amount of airflow is provided

to the coil. Check for proper air flows and return air practices.

Improperly charged systems run the risk of short cycling as

well. An undercharged system will react much the same as a

system with low airflow. If the charge is low enough, it may trip

out on low pressure. If a system is overcharged, it may trip out on

high head pressure. Ensure that the system charge is within the

bounds described in section "Piping the RPM-E".

System set-up and installation should be checked as well.

Piping practices should be within the bounds described in section

"Piping the RPM-E" and within the realms of the outdoor unit

manufacturer. Extreme and often unnecessary adjustment of the

TXV can create conditions similar to an undercharged coil. A

poorly placed T-stat, such as underneath a vent, can cause short

cycling. This happens due to the T-stat being satisfied very

shortly after the unit has begun to operate.

RPM-E-50

RPM-E-70

HE-Z/HE/HV - 70 / 71

LV-50

20090200050

20090200070

R-410A

18-24

30-36

(5.3-7.0 kW)

6.8-8.9

11.7-13.7

(2.0-2.6 kW)

Aluminum

Copper

.006 Al

3/8"

(9.5mm)

7/8"

(22.3mm)

3/4"

(19mm)

Yes

(22kg)

" x 14

" x 18

" x 14

⁄4

⁄8

⁄2

⁄4

(616mm x 371mm x 470mm)

2.5 - 3.0

(5.3 - 7.0 Kw)

TXV = Thermal Expansion Valve

Module RPM

Refrigerant Module Installation (RPM-E) (5/5)

RPM-E-100

HE-Z/HE/HV - 100 / 101

LV-70

LV-120/140

20090200100

R-410A

42-60

(8.8-10.6 kW)

(12.3-17.6 kW)

16.0-22.2

(3.4-4.0 kW)

Aluminum

Copper

.006 Al

3/8"

(9.5mm)

7/8"

(22.3mm)

3/4"

(19mm)

Yes

(27kg)

(34kg)

" x 18

32" x 14

⁄8

⁄2

⁄8

(813mm x 371mm x 470mm)

3.5 - 5.0

(8.8 - 10.6 Kw)

(12.3 - 17.6 Kw)

(4.7-6.5 kW)

" x 18

⁄2