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VIII. STEP 8 — MAKE CONNECTIONS BETWEEN INDOOR
AND OUTDOOR UNITS

The thermostat is wired between the indoor and outdoor
units to make the system complete.

A. Check AccuRater Metering Device

The correct AccuRater (bypass type) refrigerant control is
required for system capacity optimization. An AccuRater
device (see Fig. 19) is supplied with the outdoor unit. Refer to
Tables 4A-4C to determine the correct AccuRater piston size
and charge combination required for the condenser/evaporator
system being installed.

Piston style as shown in Fig. 19 is shipped with the unit.

 Do

not

 interchange components between the AccuRater device

types.

B. Cooling Only Systems

The following connections must be made to the outdoor unit
for it to operate as a system with the indoor unit:

Route 2 wires of field-supplied 18-gage AWG (American Wire
Gage) thermostat cable between the low-voltage terminal
block of the fan coil unit and the blue and brown low-voltage
wires in the outdoor unit low voltage terminal block. Connect
the wires Y1 to Y and C to C. See Fig. 20.

C. Heat Pump Systems

The following connections must be made to the outdoor unit
for it to operate as a system with the indoor unit: 

Route 5 wires of field-supplied 18-gage AWG thermostat
cable between the low-voltage terminal block of the fan coil
and the outdoor unit low-voltage terminal block. Connect Y1

to Y, R to R, O to O, W2 to W2, and C to C with the wires. See
Fig. 21.

The heat pump unit uses a timed defrost method. The timed
defrost can be field set for 30, 50, or 90 minutes. The timed
defrost is factory set for 90 minutes.

538A018-060

538B018-060

Fig. 19 — AccuRater (Bypass Type)

Metering Device Components

a38-6777

a38-6758

Summary of Contents for 619CNF

Page 1: ...ersonnel can perform basic maintenance such as cleaning and replacing filters All other operations should be performed by trained service personnel When working on air conditioning equipment observe p...

Page 2: ...connection of the indoor and outdoor units refrigerant piping condensate drain piping thermostat wiring For some applications a fresh air intake power vent fan and or condensate pump kit may be requir...

Page 3: ...ITY tons 11 2 2 3 3 4 5 NOMINAL SIZE Btuh 18 000 24 000 30 000 36 000 48 000 60 000 OPERATING WEIGHT lb 108 108 117 117 149 179 MOISTURE REMOVAL WEIGHT Pints Hr 4 0 7 3 6 0 9 0 13 0 14 5 FINISH GM Mot...

Page 4: ...iger ant piping and servicing unit Fig 3 and 4 4 Make sure the unit is easily accessible to electrical power UNIT SIZE 018 024 030 036 048 060 NOMINAL CAPACITY tons 11 2 2 3 3 4 5 NOMINAL SIZE Btuh 18...

Page 5: ...9 4 1013 16 1493 4 57 8 1368 4 91 2 1459 2 11 2 648 048 149 151 5 119 16 1817 5 65 8 1692 5 101 4 1783 1 97 8 555 3 31 16 992 060 179 181 7 8 2336 7 3 2211 7 65 8 2302 1 115 8 601 4 119 16 1512 NOTES...

Page 6: ...crete Slab Install hanging bolts with expansion anchor E To Mount Unit 1 Remove mounting bracket and reinstall the 2 hex head bolts factory supplied into each side of indoor unit as shown in Fig 6 All...

Page 7: ...vibrations d A piston is shipped in the factory installed metering device body Fig 13 with the indoor unit Use Tables 4A 4C to verify that you have the required piston size for the system being instal...

Page 8: ...rm the insulation as this affects its performance 5 Insulate condensate drain line s that are located in or above an occupied area with a condensate proof material such as polyurethane or neoprene 6 I...

Page 9: ...g 11 Hanging Fan Coil Unit Factory supplied Fig 12 Routing Wires Over Piping NOTE Teflon Seal must face toward the outdoor heat pump unit Fig 13 AccuRater Metering Device at Service Valve Bypass Type...

Page 10: ...data is the same for both the 24 000 Btuh 024 unit and the 024 unit that has been field reconfigured for 18 000 Btuh Refer to Before Installation section on page 3 for reconfiguration details WARNING...

Page 11: ...2 All wiring must comply with the applicable local and national codes 3 Liquid line need not be insulated cooling only units 4 Wiring and piping shown are general points of connection guides only and...

Page 12: ...Operat ing Instructions Mount thermostat to a wall in the occupied space using 2 field supplied screws Locate the thermostat in an area that is not subjected to drafts or direct sunlight through windo...

Page 13: ...rked Terminal Unmarked Splice NOTES 1 If any of the original wire furnished must be replaced it must be replaced with type 90 C wire or its equivalent 2 Wire in accordance with NEC and local codes 3 T...

Page 14: ...HERMOSTAT FLATSTAT COOLING ONLY HEAT COOL 53DFS250 FS BRY SLIMLINE THERMOSTAT HEAT PUMP COOLING ONLY HEAT COOL 53DFS250 SL BRY 5 1 1 PROGRAMMABLE THERMOSTAT COOLING ONLY HEAT COOL 53DFST2 NP BRY Fig 1...

Page 15: ...s a system with the indoor unit Route 2 wires of field supplied 18 gage AWG American Wire Gage thermostat cable between the low voltage terminal block of the fan coil unit and the blue and brown low v...

Page 16: ...16 538A 619CNF CNQ 538A 619CNF CNQ Fig 20 Cooling System Wiring Diagram a40 1636...

Page 17: ...17 619CNQ 538B 538B 619CNQ Fig 21 Heat Pump Wiring Diagram a40 1637...

Page 18: ...temperature when only the fan is operating VI OPERATING SEQUENCE Ceiling suspended fan coil units have a relay board which controls system operation in response to a room thermostat The user may manua...

Page 19: ...ors are factory lubricated and require no oiling II AIR FILTERS FIG 23 A Remove Air Filters Remove filters by pulling them straight out B Clean Or Replace Filters Filters can be vacuumed or washed in...

Page 20: ...until either COOL or HEAT is displayed as desired 4 Adjust thermostat set point to desired room tempera ture If system starts within a few minutes service may not be necessary If system does not opera...

Page 21: ...ot Cool Properly Air filter s in indoor unit is dirty or needs to be replaced Clean or replace air filter s Temperature is set too high or too low Reset temperature to desired comfort setting using th...

Page 22: ...nce A large selection of product theory and skills programs are available using popular video based for mats and materials All include video and or slides plus companion book Classroom Service Trainin...

Page 23: ...WITHIN SIGHT OF THE UNIT ____________ IS THE LOW VOLTAGE CABLE INDOOR TO OUTDOOR UNIT RUN AND CONNECTED PROPERLY ____________ HAS CONDENSATE DRAIN BEEN RUN SLOPED AND TRAPPED PROPERLY ____________ IS...

Page 24: ...RIGERANT PIPING EQUIVALENT LINE LENGTH IF OVER 50 FT LIFT FAN COIL ABOVE OUTDOOR UNIT IF OVER 25 FT FAN COIL BELOW OUTDOOR UNIT IF OVER 25 FT APPLIES ONLY TO 38HDC AND 38QRC UNITS USING LONG LINES APP...

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