Water Furnace SAH Series, Installation Manual

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11
SAH AIR HANDLER INSTALLATION MANUAL
General Installation Information cont.
Refrigeration
The SAH Series air handlers are supplied with an expansion
device. The txv supplied has an internal check valve so no
external check valve is necessary. Check sub-cooling and
superheat, refrigerant charge and txv may require further
adjustment.
TXV Superheat Adjustment Procedure (see figure 4)
Txv’s may require adjustment for a specific application.
1. Remove the seal cap from the bottom of the valve.
2. Turn the adjustment screw counterclockwise to increase
superheat and clockwise to decrease superheat.
One complete 360° turn changes the superheat
approximately 1-2°F. You may need to allow as much as
30 minutes after the adjustment is made for the system
to stabilize.
3. Once the proper superheat setting has been achieved
replace and tighten the seal cap.
Warning – There are 12 total (360°) turns on the superheat
adjustment stem from wide open to fully closed.
When adjusting the superheat stem counterclockwise
(superheat increase) and the stop is reached, any further
counterclockwise turning adjustment will damage the valve.
Charging the System
Refer to the compressor section Installation Manual for
charging the system, checking subcooling/superheat and
unit operating parameters. Refer to the Refrigerant Line
Sizing table for initial refrigeration charge amounts used
with the split.
Line Set Sizes
Unit
Size Air
Handler
20 feet 40 feet 60 feet
Split
Factory
Charge
(oz.)
*Charge
Amount with
SAH Air
Handler (oz.)
Suction Liquid Suction Liquid Suction Liquid
022 SAH022 5/8” OD 3/8” OD 5/8” OD 3/8” OD 3/4” OD 3/8” OD 56 76
030 SAH030 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 3/8” OD 56 82
036 SAH036 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD 56 96
042 SAH042 3/4” OD 3/8” OD 3/4” OD 3/8” OD 7/8” OD 1/2” OD 74 104
048 SAH048 3/4” OD 3/8” OD 7/8” OD 3/8” OD 7/8” OD 1/2” OD 90 112
060 SAH060 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 92 119
070
SAH066 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 108 135
026 SAH026 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD 52 72
038 SAH036 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD 56 96
049
SAH048 3/4” OD 3/8” OD 7/8” OD 3/8” OD 7/8” OD 1/2” OD 90 112
064 SAH060 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 96 119
072 SAH066 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 104 133
CAPACITY MULTIPLIER 1.00 0.985 0.97
Notes: * The “Charge Amount with SAH Air Handler” column is based on the charge amount for a SAH Air H
Compressor Section/Split.
Additional charge will need to be added accordingly for line set length.
After charge is added, additional adjustments can be made to get appropriate subcooling and superheat measurements.
Additional charge for R410A is 0.50 oz. per ft. for 3/8” and 1.0 oz. per ft. for 1/2” tube.
Longer line sets will significantly reduce capacity and efficiency of the system as well as adversely effect the system reliability
due to poor oil return.
1/13/2017