Midea MT-200R20E20

Fig.4-10
Connection pipe
Spool
Valve spool
Bonnet
Connection nut
Ball-shape cushion
Handle
Drainage pipe
Fig.4-9
Before water heater runs, please make sure every stop valve has been opened.
CAUTION
12
4.3.2 PTR valve
• The valve body unloading pressure is 850kPa, unloading temperature is 99°C, and the valve body opening
energyvalueis46kW,moredetailsrefertocerticateNo:WMK26608.
• PTvalveistightenedwitha68N.mtorquewrench.Applysealanttotherst3turnsofscrewthreadbefore
installation; After installation, the outlet of the drain pipe shall be installed face down, and the thread turns that
are not screwed into the PT valve shall be less than 3 turns.
• Beforellingthewatertank,thePTRvalvemustbeinstalledproperly.
• The PTR valve should be checked every half year to make sure that there is no restriction of the valve. Please
beware of hot water from the valve. The drainage pipe should be well insulated in order to prevent water inside
pipe from freezing in cold weather.
4.3.3 Stop valve instruction
• In general, the shape of stop valve and names of each part are shown in Fig.4-10.
• E󰀨ectofstopvalve:
- Stop the system when the unit is working.
- When water tank connects with the outdoor unit, vacuumize and add refrigerant through it.
- Stop the system and then recycle refrigerant to outdoor unit when maintaining.
• Open and close the stop valve:
- Open: dismantle the bonnet by wrench and insert an *Allen key to spool, open the stop
block anticlockwise and then tighten the bonnet.
- Close: use a wrench to dismantle the bonnet and insert an Allen key to spool, close the stop
block clockwise and then tighten the bonnet.
4.3.4Connectionlengthofoutdoorunitandwatertankpipeandheightdi󰀨erencerequirements:
Table 4-1
Max.length
(m)
Max.heightdi󰀨erence
(m)
Standard length
(m)
Standardheightdi󰀨erence
(m)
20 10 3 0
*Allen key