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Balance Point Worksheet
0
10
20
30
40
50
60
70
-20 -10 0 10 20 30 40 50 60
Outdoor Air Temp (Deg F)
Building Heat Loss, 1000BTUH
Unit Integrated Heating Capacity,
1000BTUH
060
048
042
036
030
024
Based on Entering Indoor Air of 70 Deg. F and Rated CFM
C03008
Fig. 25 -- 50CR Balance Point Worksheet
Step 6—Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a
refrigerant leak.
If oil is detected or if low performance is suspected, leak test all
refrigerant tubing using an electronicleak detector, or liquid-- soap
solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
Ifno refrigerant leaksare found andlow performanceissuspected,
refer to Checking and Adjusting Refrigerant Charge section.
Step 7—Indoor Airflow
Theheatingand/orcoolingairflowdoesnotrequirecheckingunless
improperperformanceis suspected.If aproblemexists,besurethat
all supply-- and return-- air grilles are open and free from
obstructions, and that the air filter is clean.
Step 8—Metering Devices--TXV & Accurater Piston
This unit uses 2 types of metering devices. The outdoor metering
deviceisafixedorificeandiscontainedinthebrass--hexbodyinthe
liquid linefeedingtheoutdoorcoils.The indoormetering deviceis
a TXV--type device.
Step 9—Pressure Switches
Pressure switches are protective devices wired into control circuit
(low voltage). They shutoff compressorifabnormally high orlow
pressures are present in the refrigeration circuit. These pressure
switches arespecifically designedtooperatewith Puron(R-- 410A)
systems. R--22 pressure switches must not be used as replacements
for the Puron (R -- 410A) system.
C99097
Fig. 26 -- Refrigerant Circuit
Step 10—Loss--of--Charge Switch
This switch is located on the liquid line and protects against low
suction pressures caused by such events as loss of charge, low
50CR50CR