Toshiba Carrier MCY-MAP0367HS-UL Installation Manual

Also see for Carrier MCY-MAP0367HS-UL: Owner's manual Startup guide

Installation Manual– 12 –EN Air purgeNOTEFor the air purge at installation time (discharge of air in the connecting pipes), use the “Vacuum pump method”.• For protection of the earth’s environment, do not discharge the refrigerant gas into the air.• Eliminate the remaining air (nitrogen gas, etc.) in the unit with a vacuum pump.If gas remains, performance and reliability of the unit may be reduced.After the airtight test, discharge the nitrogen gas. Then connect the gauge manifold to the service ports at the gas sideand liquid side, and connect the vacuum pump as shown in the following figure.Perform vacuuming for gas side and liquid side.• Perform the vacuuming method from both the liquid and gas sides.• Use a vacuum pump with the counter-flow preventive function so that oil in the pump does not back up in the airconditioner pipe when the pump has been stopped. (If oil in the vacuum pump enters into the air conditioner withR410A refrigerant, a problem may occur in the refrigeration cycle.)• Use a vacuum pump that has a high vacuum (below -14.6 psi) and a large exhaust gas amount (over 40 L /minute).• Perform vacuuming for 2 or 3 hours (time differs due to pipe length).In this time, check all valves at the liquid and gas sides are fully closed.• If the vacuuming valve amount is not decreased to below -14.6 psi even after vacuuming for 2 hours or more,continue vacuuming for 1 hour or more.If -14.6 psi or less cannot be obtained by 3 hours or more of vacuuming, detect and repair the leak.• When the vacuuming valve has reached -14.6 psi or less after vacuuming for 2 hours or more, close valves VL andVH on the gauge manifold fully. Stop the vacuum pump, leave it as it is for 1 hour and then check that the vacuumdoes not change. If it does change, then there may be a leak within the system.• After the above procedure for vacuuming has finished, exchange the vacuum pump with a refrigerant cylinder andadvance to the additional charging of refrigerant.Main pipeConnected to indoor unit Low pressuregaugeHigh pressuregaugeBall valve fully closed(Gas side)Flare connectionFlare connectionPacked valve fully closed(Liquid side)Service portVacuum pumpGaugemanifoldOutdoor unitService port Adding refrigerantAfter vacuuming is complete, exchange the vacuum pump with a refrigerant canister and start the additional charging ofrefrigerant.Calculation of additional refrigerant charge amountThe default refrigerant amount does not include the refrigerant for pipes at the local site.For refrigerant to be charged in pipes at the local site, calculate the amount and charge it additionally.Table 1Table 2Example: (060 type)Additional charge amount R (kg)Lx: Real total length of liquid pipe diameter 1/4" (ft)Ly: Real total length of liquid pipe diameter 3/8" (ft)= {( Lx × 0.017 lbs/ft ) + ( Ly × 0.038 lbs/ft )} × 1.2 + ( 1.76 lbs )= {( 39.3 × 0.017 lbs ) + ( 91.8 × 0.038 lbs )} × 1.2 + ( 1.76 lbs )= 6.75 lbsOutdoor unit type MAP0367 MAP0487 MAP0607Charging amount (lbs (kg)) 14.8 (6.7) 14.8 (6.7) 14.8 (6.7)Additionalrefrigerant chargeamount at local site= Real length of liquidpipe ×Additional refrigerantcharge amount per1 ft liquid pipe(Table 1)× 1.2 +Compensation byoutdoor HP(Table 2)Liquid pipe dia. (in) Ø1/4" Ø3/8"Additional refrigerant amount /1 ft liquid pipe (lbs/ft) 0.017 0.038Outdoor unit type MAP0367 MAP0487 MAP0607Compensation by outdoor capacity (lbs (kg)) 0 (0) 0.88 (0.4) 1.76 (0.8)L1 Ø3/8": 32.8 ft L2 Ø3/8": 32.8 ft L3 Ø3/8": 16.4 ft L4 Ø3/8": 9.8 ftL5 Ø1/4": 9.8 ft L6 Ø1/4": 13.1 ft L7 Ø1/4": 16.4 ftL1 L2 L3L4 L5 L6 L7DCBAEN-23 EN-24