Parker MTW-9 Installation & Servicing Instructions

(S)ORIT to CDS Conversion Kit
Types MTW-9(S), -17(S), and -21(S)
INSTALLATION AND SERVICING INSTRUCTIONS
SD-297 / 52025
The Sporlan (S)ORIT pilot operated EPRs (Evaporator Pressure
Regulators) have been the standard for accurate evaporator
control for many years. A conversion to the increased accuracy
of CDS step motor EEPRs (Electronically controlled Evaporator
Pressure Regulators) is now available for installation without
removing the existing (S)ORIT bodies.
Table 1 - EMS Controller Manufacturers Contact Info and Required Interface Boards/Power Supplies
Controller
Manufacturer Literature Interface Board
and Model
Com-Trol: 4ZAB518G01 (Edge)
ESB-8
4K & 4K2E 4ZAB618G01 (Flat)
CPC: 026-1720
Einstein I/II Rev 1 01-27-06
Danfoss:
DKRCE.P1.R1.
AKC-55
A2.22
AK2-SC 255
Micro-Thermo —
DISASSEMBLY – ALL VALVES
Refer to Table 2 for a quick reference guide.
1 High pressure supply to the valve should be shut off.
2 The circuit to be updated should be pumped down, isolated and
residual refrigerant reclaimed.
3 All power should be removed from any solenoid operator on the
valves.
4 The coils and all wiring should be removed at the relays or other
connections in the control panel. Any vacant knockout holes should be
plugged per electrical code.
5 Flare nuts on the pilot lines and high pressure sources should be
loosened carefully in case of any residual pressure.
Note: As a safety precaution, partially loosen the flange plate lock
nut [(S)ORIT-12 or the 4 flange plate bolts (S)ORIT-15/(S)ORIT-
20], and break the seal between the flange plate and valve body.
This will allow any refrigerant that may be trapped to vent before
removing the flange plate.
6 The pilot lines should be removed from the pilot assembly and bent
out of the way.
DISASSEMBLY AND REASSEMBLY (S)ORIT-12
1 The locknut holding the pilot to the valve body should be loosened
and the pilot removed.
2 Remove and discard the piston and spring.
3 The pilot lines may be closed with flare plugs but to avoid the
possibility of leaks the lines should be crimped and brazed shut. The
lines may be cut at a convenient location but not within 2 inches of
the valve body to prevent harming the braze joint on the body. A wet
cloth should be used and the brazing done before the kit is installed to
prevent damage to the kit or wiring.
4 Inspect the gasket seating surface to assure that it is clean and flat.
5 Lubricate the tetraseal with refrigeration oil and mount the kit to the
valve.
Care should be taken to ensure that the motor/piston is not driven
6
more than 50% closed before installing on (S)ORIT body.
7 Tighten locknut to 60-65 foot pounds of torque.
DISASSEMBLY AND REASSEMBLY (S)ORIT-15
1 Loosen and remove the bolts holding the flange plate to the body.
Penetrating oil may be used to help loosen the bolts.
2 Remove the pilot assembly.
3 Remove and discard the piston, spring, gasket and piston sleeve. A
bearing puller may be helpful.
4 Caution: sleeve must be removed to prevent kit damage.
5 Care should be taken to ensure that the motor/piston is not driven
more than 50% closed before installing on (S)ORIT body.
6 Remove any residual penetrating oil, if used on the bolts.
7 Inspect gasket seating surface to assure that it is clean and flat.
8 Lubricate gasket with refrigeration oil and install kit to body.
9 Tighten the 4 flange plate bolts to the appropriate torque setting listed in
Table 2.
Stepper Number Communication
of Valves Interface Board
Required per I.B. Required
8
MultiFlex Board
8
p/n 810-3198
AK2-XM-208B p/n 080Z0061
4
p/n 080Z0022 (1 per 4 I.B.)
MT-EEPR V 5
Conversion kits are available for (S)ORIT-12, (S)ORIT-15 and
(S)ORIT- 20. Part numbers for ordering can be found in Table 2.
Conversion will require the proper conversion kit and the
interface board offered by the EMS controller manufacturer.
Table 1 lists the part number of the board and contact information
for the manufacturers. Manufacturers should be consulted for the
latest information and conversion suggestions.
Low Voltage Interface
Transformer Boards per
Required Transformer
No 425005BH07 1
No 640-0080 1
p/n 080Z0052
4
(56 VA)
No — —
Note: The mounting screws are captive to the flange plate and must be
tightened alternately. No attempt should be made to remove the flange
plate from the kit to gain access to the bolts.
DISASSEMBLY AND REASSEMBLY (S)ORIT-20
Follow instructions for the (S)ORIT-15 kit, but there is no need to
remove the sleeve.
WIRING THE VALVES
1 Route the kit cables to the appropriate control panel and connect to the
interface boards used. To prevent cable damage, grommets or strain
reliefs should be used whenever the cable passes through the panel or
any metallic bulkhead.
2 The cable should be supported in the proper manner and care should
be taken that routing avoids hot piping or sharp edges.
3 Connect the 4 wire leads on the CDS motor kit to the appropriate
terminals on the interface board (Molex connectors may be required
on certain CPC interface boards). Consult the controller manufacturer
for the correct wiring sequence.
SETTINGS
The required set-points should be entered in the EMS controller. The
following are general guidelines. Refer to the EMS manufacturer's setup
instructions for specific instructions.
The set-points specific to CDS valves are shown in Table 3. If these are
not entered as listed, the valve will not control correctly.
Note: Most EMS controllers come with defined factory default settings
for step-motor suction line regulators. These will likely be different than
those required for the CDS valve.
All remaining set-points must be entered. Refer to the controller setup
instructions for the proper procedure. These may include the following:
(1) temperature set-point, (2) dual temperature, (3) defrost type, (4)
valve over close percentage, (5) maximum valve opening percentage,
(6) pulldown valve opening percentage, (7) temperature/communication
failure valve opening percentage, (8) specifying a lead circuit for suction
pressure float.
The CDS Motor Kit is shipped approximately 50% open. After the motor
kit has been installed on the (S)ORIT body, and the motor leads are
connected to the interface board, the valve's motor must be initialized.
This requires verifying that the CDS motor is 0% open when the
controller is calling for it to be 0% open. Normal initialization occurs
on board power-up. Two initializations may be required to assure full
closing and zero position. Failure to initialize the valve may prevent it
from closing fully for pumpdown or defrost. This can be confirmed by
using an SMA-12 to manually drive the valve closed, and monitoring
suction pressure.
Phone
Website
Number
450-668-3033 www.microthermo.com