Manual

Tab{e 2--Accessory Usage
REQUIRED FOR REQUIRED FOR REQUIRED FOR
LOW-AMBiENT LONG-LINE BURRED LINE
ACCESSORY
APPLICATBONS APPLICATIONS* APPMCATBONSt
(BELOW 55°F} (OVER 50 FT) (OVER 3 FT)
Crankcase Heater Yes Yes Yes
Evaporator Freeze Thermostat Yes No No
Accumulator No No Yes
Compressor Start-Assist
Yes Yes Yes
Capacitor and Relay
MotorMaster® Control,
or Yes No No
Low-Ambient Pressure Switch
See low-ambient
Wind Baffle No No
instructions
Unit Risers Recommended No No
Liquid-Line Solenoid Valve See Long-Line
or No Application Yes
Nard-Shutoff TXV Guideline
BaR-Bearing Fan Motor Yes_: No No
* For tubing line sets between 50 and 175 ft, refer to Application Guideline and Service Manual -- Air Conditioners and Heat Pumps.
? For buried line applications, refer to Application Guideline and Service ManuN -- Air Conditioners and Heat Pumps
$ Required for low-ambient controller (full-modulation feature) and MotorMaster@ Control only.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
FIELD POWER 1
WIRING
FIELD GROUND
WIRING ]
CONTACTOR
C)° C)
C)oC)
Q
GROUND
LUG
A9f05g
Fig. 8--Line Power Connections
"Use t'urnace trans%rmer, fbn coil transfom_er, or accesso_ trans-
former for control power, 24vi40va minimum.
NOTE: Use of available 24v accessories may exceed the mini-
mum 40va power requirement. Determine total transformer load-
ing and increase the transfbrmer capacity or split the load with an
accessory tlansformer as required.
IMPORTANT: (heck fhctolw wiring and wire connections to
ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal and so
forth.
Step 11--Compressor Crankcase Heater
When equipped with a crankcase heater, fi/rnish power to heater a
minimum of 24 hr bet'ore starting unit To f_lrnish power to heater
only, set thermostat to OFF and close electrical disconnect [o
outdoor unit A crankcase heater is required if refi'igerant robing is
longer than 50 ft
Step 12--install EtectricN Accessories
Refer to the individual instrnctions packaged with kits oi" acces=
series when installing.
Step 13--Start-Up
e
To prevent compressor damage or personal injnry, observe
the following:
*Do not overcharge system with refi'igerant,
*Do not operate unit in a vacuum or at negative pressure,
*Do not disable low-pressure switch
In scroll compressor applications:
*Dome tempe*amres may be hot,
To prevent personal ir{jury wear safety glasses, protective
clothing, and gloves when handling refi'igerant and obsma'e
tke t'ollowing:
*Back-seating seix'ice valves are not equipped with Schrader
valves. Fully back seat (counterclockwise) valve stem befbre
removing gage=port cap
*Front=seating service valves are equipped with Schrader
valves,
Federal Regulations require that you do not vent retiigerant to
atmosphere, Recover during system repair or final unit
disposal,
Follow these steps to properly pumpdown a system and avoid
negative suction pressu*e
1 Fully back seat (open) tiquid- and vapor-robe so*vice valves
2 l_nit is shipped with valve stem(s) fiont seated (closed) and
caps installed Replace stem caps after system is opened to
refrigerant flow, Replace caps f_nger-tight and tighten with
wrench an additional 1/12 turn,
3 (lose electrical disconnects to energize system,