Thermo™ Expansion Valve Series TIH: Installation and Operation Guide
Emerson Climate Technologies GmbH
Am Borsigturm 31 | 13507 Berlin | Germany
General Information
The TIH series of Thermo™-Expansion Valves are designed for air conditioning, heat pumps, and commercial refrigeration applications. The TIH is ideal for those applications requiring hermetic/compact size combined with stable and accurate control over wide load and evaporating temperature ranges.
Safety Instructions
- Read operating instructions thoroughly. Failure to comply can result in device failure, system damage, or personal injury.
- According to EN 13313, it is intended for use by persons having the appropriate knowledge and skill.
- Before opening any system, make sure pressure in the system is brought to and remains at atmospheric pressure.
- Do not release any refrigerant into the atmosphere!
- Do not exceed the specified maximum ratings for pressure and temperature.
- Do not use any other fluid media without prior approval of EMERSON. Use of fluids not listed could result in: Change of hazard category of product and consequently change of conformity assessment requirement for product in accordance with European pressure equipment directive 14/68/EC.
- Ensure that design, installation, and operation are according to European and national standards/regulations.
Mounting Location
Valves may be installed in any position but should be located as close as possible to the distributor or evaporator inlet. Fig. 1 shows the heat pump application.
Brazing
(Fig. 2) Perform and consider the brazing joint as per EN 14324. Before and after the brazing clean tubing and brazing joints. To avoid oxidization, it is advised to purge the system with an inert gas such as nitrogen while brazing. Do not exceed the max. body temperature of 120°C!
Installation
Warning: Do not bend the capillary tube at the interface to the head of the valve. Allowed: distance N (10 mm) and radius R (5 mm).
Fig. 3: Securely fasten the bulb with straps provided. Insulate the bulb with a suitable material. The location of the bulb on the suction line is dependent on the size of the suction line (see Fig. 4). Be sure that the external equalizer line cannot siphon oil from the suction line. The expansion valve must be protected against all contaminants. Install a filter drier before the valve. Install a sight glass before the valve.
Pressure Test
After completion of installation, a pressure test must be carried out as follows:
- According to EN 378 for systems which must comply with European pressure equipment directive 14/68/EU.
- To maximize working pressure of the system for other applications.
Warning: Failure to do so could result in loss of refrigerant and personal injury. The pressure test must be conducted by skilled persons with due respect regarding the danger related to pressure.
Leakage Test
Conduct a tightness test according to EN 378-2 with appropriate equipment and method to identify leakages of external joints.
Operation
Check for leaks; sufficient refrigerant charge and be sure no flash gas is present before attempting to check the valve operation.
Proper Operation of Charges
The maximum bulb temperature is limited to:
| Charge Code | Charge | Max. bulb Temperature |
|---|---|---|
| Z1/Z3, M1/M3, N1/N3, C1/C3 | MOP | +120°C |
| M0/M2, C0/C2 | liquid | +100°C |
| N0/N2, B0/B2 | liquid | +80°C |
Warning: Valves with gas charge feature MOP function and operate properly only if the temperature at the bulb is below the temperature at the head of the valve and at the capillary tube (see Fig. 5). If the valve head becomes colder than the bulb, malfunction of the expansion valve occurs (i.e., erratic low pressure or excessive superheat).
Factory Settings
The table below provides the factory setting position of the superheat adjusting stem and shows the number of turns clockwise when adjusting the stem fully open counterclockwise.
| Charge Code | Number of turns (360°) | Charge Code | Number of turns (360°) |
|---|---|---|---|
| Z1/Z3 | +5.5 | - | - |
| M1/M3 | +2.5 | M0/M2 | +2.5 |
| N1/N3 | +5.5 | N0/N2 | +4.5 |
| - | B0/B1 | +3.5 | |
| C1/C3 | +1.5 | C0/C2 | +3 |
TIH in Systems with Nonstandard Refrigerants
The following refrigerants can be used with standard available charges when factory setting to be readjusted for optimum superheat level. The readjustment depends on operating evaporating temperature and it is as guideline as follows:
| Refrigerant | Charge code | Evaporating temperature (°C) | ||||
|---|---|---|---|---|---|---|
| +5 | 0 | -10 | -20 | -30 | ||
| Number of turns | ||||||
| R32 | Z1 | -1 | 0 | 0 | 0 | - |
| R452B | Z1 | +2.5 | +2.5 | +2.5 | +2.5 | - |
| R454B | Z1 | +3 | +3 | +3 | +3 | - |
| R450A | M0 | +2.5 | +2 | +1 | +0.5 | - |
| R454C | N1 | 0 | 0 | 0 | 0 | - |
| R454C | N0 | +0.5 | +0.5 | 0 | -0.5 | - |
| R1234YF | C1 | 0 | 0 | 0 | +0.5 | - |
| R1234YF | C0 | 0 | 0 | 0 | +1 | - |
| R454A | B0 | -2 | -2 | -1 | -0.5 | 0 |
| R455A | B0 | +1.5 | +1.5 | +1.5 | +1.5 | +1.5 |
Note: Change of static superheat will shift MOP point in reverse direction. Note2: TIH for R134a with MOP (M1) shall not be used for R450A.
Warning: There are max. 12 turns on the adjustment stem (from left stop to right stop). When the stop is reached, any further turning will damage the valve.
Superheat Adjustment
If the superheat must be adjusted for the application proceeds as follows:
- Remove the seal cap from the bottom of the valve.
- Turn the adjustment screw clockwise to increase the superheat and counterclockwise to decrease the superheat.
Changes in Superheat (K) per stem turn depending on evaporating temperature and refrigerant:
| Refrigerant | Evaporating temperature (°C) | ||||
|---|---|---|---|---|---|
| -30 | -20 | -10 | 0 | +5 | |
| R410A | 1.3 | 1.0 | 0.8 | 0.6 | 0.5 |
| R32 | 1.3 | 1.0 | 0.7 | 0.6 | 0.5 |
| R452B | 1.4 | 1.1 | 0.8 | 0.6 | 0.6 |
| R454B | 1.5 | 1.1 | 0.8 | 0.6 | 0.6 |
| R407C | 2.3 | 1.6 | 1.2 | 0.9 | 0.8 |
| R448A | 2.0 | 1.5 | 1.1 | 0.9 | 0.8 |
| R449A | 2.0 | 1.5 | 1.1 | 0.9 | 0.8 |
| R134a | - | 2.5 | 1.8 | 1.4 | 1.2 |
| R513A | - | 2.3 | 1.7 | 1.3 | 1.2 |
Note: Change of static superheat will shift MOP point in reverse direction.
Note2: TIH for R134a with MOP (M1) shall not be used for R450A.
Technical Data
| Max. working pressure PS | 46 bar |
| Factory test pressure PT | 50.6 bar |
| Medium temperature TS | -40…+70°C |
| Dimensions | Fig. 8 |
Service / Maintenance
Defective TIH must be replaced. Repair is not possible.
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