Carrier 50YA Installation And Start-Up Instructions Manual
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Carrier 50YA Installation And Start-Up Instructions Manual

Carrier 50YA Installation And Start-Up Instructions Manual

Water source comfort system
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Installation and Start-Up Instructions
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause personal injury or property damage.
Consult a qualified installer, service agency, or your distributor or
branch for information or assistance. The qualified installer or
agency must use factory-authorized kits or accessories when
modifying this product. Refer to the individual instructions pack-
aged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for brazing operations. Have fire extinguisher
available. Read these instructions thoroughly and follow all
warnings or cautions attached to the unit. Consult local building
codes and the National Electrical Code (NEC) for special instal-
lation requirements.
Recognize safety information. This is the safety-alert symbol
When you see this symbol on the unit or in instructions and
manuals, be alert to the potential for personal injury.
Understand the signal word DANGER, WARNING, or CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards that could
result in personal injury or death. CAUTION is used to identify
unsafe practices which would result in minor personal injury or
product and property damage.
Electrical shock can cause personal injury or death. Before
installing or servicing system, always turn off main power to
system. There may be more than 1 disconnect switch. Turn
off accessory heater power if applicable.
INSTALLATION
Step 1—Check Jobsite
HORIZONTAL UNITS
Because horizontal units are designed for installation above a false
ceiling or ceiling plenum, access becomes an important consider-
ation. Be sure that the site chosen for unit installation provides
enough clearance to allow easy maintenance or servicing of the
unit without removal from the ceiling. Refer to Fig. 1 for a typical
horizontal unit.
INSTALLATION GUIDELINES
1. Provide a hinged access door (inconcealed-spline or plaster
ceilings), or removable tiles (in T-bar or lay-in ceilings).
The access opening must be large enough to allow the service
technician to service the unit (including compressor removal
and replacement), and to permit removal of the unit. See Fig.
2 for base unit dimensions.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 101
Catalog No. 565-188
Tab 5a 5a
Water Source Comfort System
2. Provide easy access to hanger brackets, water valves, and
fittings, and allow screwdriver clearance to access panels, the
.
discharge collar, and all electrical connections.
3. If a return duct is used, be sure to provide a duct slot for filter
replacement.
4. To allow removal of the unit, do not run obstructions (for
example, piping, electrical cable, etc.) under the unit.
5. Minimize obstructions in the conditioned space beneath the
unit whenever possible. A manual, portable jack can then be
used to lift and support the weight of the unit during
installation or servicing.
VERTICAL UNITS
While vertical units are typically installed in a floor level closet or
basement. The unit access guidelines for vertical units are very
similar to those described for horizontal units. Refer to Fig. 2 for
base unit dimensions and Fig. 3 for condensate trap installation.
UNIT LOCATION
1. Provide adequate clearance for filter replacement and drain
pan cleaning. Do not allow piping, conduit, etc. to block filter
access.
2. Provide sufficient access to allow maintenance and servicing
of the fan and fan motor, compressor, and coils.
3. Provide an unobstructed path to enable removal of the unit
from the closet or utility room.
4. Provide ready access to water valves and fittings, and allow
screwdriver access to unit side panels, discharge collar, and all
electrical connections.
Step 2—Check Unit
Be sure to inspect the carton or crating housing each unit as it is
received at the job site. Verify that all items have been received
and that there is no visible damage; note any shortages or damage
on all copies of the freight bill. In the event of damage or shortage,
remember that the purchaser is responsible for filing the necessary
claims with the shipping company.
Printed in U.S.A.
Form 50YA-1SI
Fig. 1—Model 50YAH
Pg 1
7-93
50YA
A93331
Replaces: New

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  • Page 1 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 101 Catalog No. 565-188 Printed in U.S.A. Form 50YA-1SI Pg 1 7-93 Replaces: New Tab 5a 5a...
  • Page 2 Vertical Models UNIT SIZE A (IN.) B (IN.) C (IN.) 009,012 24-1/8 19-1/8 19-1/8 015,019 37-1/2 21-1/8 21/1/8 024,030 37-1/2 21-1/8 18-1/8 25-5/16 25-5/16 042-060 43-3/16 28-1/8 28-1/8 Horizontal Models UNIT SIZE A (IN.) B (IN.) C (IN.) 009,012 11-1/8 015,019 024,030 042-060...

  • Page 3: Unit Protection

    3. Verify that the refrigerant tubing is free of kinks or dents, and that it does not touch other unit components. 4. Inspect all electrical connections; connections should be clean and tight at the terminals. The compressors are internally spring-mounted. Those equipped with external spring vibra- tion isolator must have bolts loosened and shipping clamps removed.
  • Page 4 Normally it is required that the heat pump be installed in a protected space inside the conditioned area. If the unit is installed in an unconditioned space, it is imperative that it be isolated and protected so that its physical temperature is maintained at 60°F or above.

  • Page 5: System Checkout

    A88174 Fig. 7—Line Power Connection ate lift, power requirement, run time, etc. to ensure the energy saved by the water source heat pump is not consumed by the well CARRIER 50YA pump. THERMOSTAT TERMINAL EARTH COUPLED-CLOSED LOOP HEAT PUMP BOARD...
  • Page 6 Table 1—Potential Problem Areas POTENTIAL PROBLEMS USE COPPER COIL USE CUPRONICKEL COIL SCALING Less than 350 ppm (25 grain/gal- More than 350 ppm (up to sea Calcium and Magnesium Salts lons) water) (hardness) High Iron Oxide CORROSION* 5 to 7 and 9 to 10 Less than 10 ppm 10 to 50 ppm Hydrogen Sulfide...

  • Page 7: Safety Controls

    WATER SUPPLY COLD WATER SUPPLY TEMPERATURE & PRESSURE RELIEF CHECK VALVE WATER HEATER SHUTOFF VALVES NOTE: All copper tubes and fittings ″ O.D. minimum. to be Maximum 50 ft separation. DRAIN Insulate all piping runs with VALVE ″ wall closed cell insulation. A93336 Fig.

  • Page 8: Heating Mode

    ELECTRICAL AIR VENT LOCATED AT SYSTEM HIGH POINT TEMPERATURE & PRESSURE RELIEF INDICATOR PLUG ELECTRICAL PUMP CONDUIT (BY OTHERS) WATER HEATER SHUTOFF VALVE NOTE: All copper tubes and fittings ″ O.D. minimum. to be Maximum 50 ft separation. Insulate all piping runs with ″...
  • Page 9 Table 4—Cooling Operating Pressures (PSIG) ENTERING FLUID TEMPERATURE ENT. UNIT SIZE TEMP. Suct Disch Suct Disch Suct Disch Suct Disch 67-73 120-140 73-79 163-183 77-83 221-241 81-87 279-299 70-76 130-150 76-82 173-193 80-86 231-251 84-90 289-309 73-79 140-160 79-85 183-203 83-89 241-261 87-93...
  • Page 10 Table 5—Heating Operating Pressures ENT. ENT. ENT. ENT. UNIT SIZE FLUID SUCT DISCH UNIT SIZE FLUID SUCT DISCH TEMP TEMP. TEMP. TEMP. 37-43 157-177 31-37 157-177 42-48 165-185 37-43 167-187 50-56 170-190 47-53 184-204 61-67 181-201 56-62 207-227 68-74 186-206 67-73 220-240 76-82...

  • Page 11: Maintenance

    WATER TANK REFILL 1. Open the cold water supply to the tank. To avoid fouled machinery and extensive unit clean-up, do 2. Open a hot water faucet to vent air from the system until water not operate units without filters in place or use as a temporary flows from the faucet, then close.

  • Page 12: Trobleshooting

    TROBLESHOOTING Thermostat In On Position, But Unit Does Not Operate SYMPTOM SECONDARY SYMPTOM CHECKS AND CORRECTIONS Check for faulty or incorrect wiring in the line voltage circuit, over- Compressor Silent heated contacts, open compressor windings, or overloaded. Check for low line voltage, loose connections, defective start relay, Contactor Closed or compressor capacitor.
  • Page 13 Unit Short Cycles SYMPTOM SECONDARY SYMPTOM CHECKS AND CORRECTIONS Recalculate the building load. To assure satisfactory condi- Unit Oversized Incorrect Load Calculation tions within the building, it may be necessary to install a smaller unit. Run Capacitor Defective Replace the capacitor. If amp draw is normal, compressor windings are overheated or the overload is defective.

  • Page 14: Checks And Corrections

    Check for inadequate antifreeze in loop or ice forming in the heat Closed Loop exchanger. Copyright 1993 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 13121c Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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