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U-5 IOM

Guidelines for refrigerant circuit diagnosis

Normal Conditions

Subcooling:

10 to 12 F

Superheat:

8 to 12 F

Discharge:

140 to 150 F

Head Pressure:

210#

Suction Pressure:

70#

Evap. Temperature: 38 to 55 F, or 10-20 F below

leaving air temperature

Over-Charged Unit

Subcooling:

20 to 25 F

Superheat:

8 to 12 F

Discharge:

120 to 130 F

Head Pressure:

220# or higher than normal

Suction Pressure:

80# or higher than normal

Under-Charged Unit

Subcooling:

6 to 8 F or lower than normal

Superheat:

25 to 30 F or higher than

normal
Discharge:

Over 200 F

Head Pressure:

180# or lower than normal

Suction Pressure:

25# if lost a lot of refrigerant

Other:

Lower than normal evaporative
temperature

Plugged Thermal Expansion Valve

Subcooling:

15 to 20 F or higher than

normal

Superheat:

25 to 30 F or higher than

normal

Discharge:

+200 F or warmer than normal

Head Pressure:

250# or higher than normal

Suction Pressure:

45# or lower than normal

Other:

May have frost on air coil
May have high leaving air
temperature
The air coil may not be wet

Low Evaporator Temperature

●

Undercharged.

●

Poor refrigerant distribution.

●

Low airflow (clogged filter or air coil).

●

Excess oil in refrigerant air bypassing the coil.

●

Damaged fins on the coil or poor fin-to-tube bond.

Subcooling in Cooling Mode

●

Subcooled refrigerant is found after the coax and
before the TXV.

●

The liquid line is almost always subcooled.

●

The liquid line should be several degrees colder
than the leaving water temperature.

●

Superheated refrigerant is found after the air coil
and before the compressor.

●

Superheated refrigerant is found after the
compressor and before the coax.

High Suction Superheat

●

Under-charged refrigerant circuit.

●

Poorly adjusted TXV — open it.

●

Plugged TXV.

●

High entering air temp in the cooling mode.
Poorly insulated suction line.

Low Suction Superheat

●

Over-charged refrigerant circuit.

●

Poorly adjusted TXV — close it.

●

Low entering air temp in the cooling mode.

●

Low airflow in the cooling mode.

Discharge Superheat

●

High discharge superheat:

High suction superheat
Compressor lubrication problems
Compressor electrical problems

●

Low discharge superheat:

Low suction superheat
Flooding-back

Содержание G-141-MHC

Страница 1: ... right to change specifications and design without notice G 141 MHC Voltage F 208 230 60 3 G 460 60 3 K 575 60 3 J 380 50 3 Unit Size Nominal Cooling 071 72 250 Btu hr cooling 111 111 000 Btu hr cooling 141 148 000 Btu hr cooling 181 183 000 Btu hr cooling 221 226 000 Btu hr cooling 271 270 000 Btu hr cooling 321 330 000 Btu hr cooling 381 381 000 Btu hr cooling Unit Type MHC 100 Outside Air Stand...

Страница 2: ...e vibration isolation grommets 2 Mount the unit with a 5 degree maximum pitch toward the condensate drain connection Outside air units are available with an optional bottom drain connection In the ceiling mounted arrangement this option will allow for more effective condensate removal 3 See unit data sheet for dimensional information Unit placement slab mounted Mammoth s 100 outside air heat pump ...

Страница 3: ...MUM ENTERING WATER 110 F 110 F MINIMUM ENTERING AIR 60 F 60 F MAXIMUM ENTERING AIR 100 F 100 F HEATING STD TEMP LOW TEMP MINIMUM ENTERING WATER BRINE 50 F 25 F MAXIMUM ENTERING WATER 90 F 90 F MINIMUM ENTERING AIR 40 F 40 F MAXIMUM ENTERING AIR 80 F 80 F Only one maximum condition can exist at the same time Note The minimum entering air temperature must not fall below 40 F If the outside air is co...

Страница 4: ...ess panels see Figure 4 are held in place by several sheet metal screws After one of the access panels have been removed the filters will slide out The same access panel that allows access to the standard 2 inch filters also allows access to the optional 4 inch thick panel filters Figure 4 Access panels Preheat Section Filter Access Section Optional hose kits The flexible water hoses are 2 foot st...

Страница 5: ...allow operation of the mechanical refrigeration for heating Figure 5 Optional preheat wiring diagram The heater includes its own control box separate from the unit s electrical panel It is mounted on the outside of the unit casing which houses all the heater control components and safety devices The heater is U L listed A separate power source from the unit is required Hot Water Preheat Optional T...

Страница 6: ...2 T3 T2 T1 L3 L2 L1 1M L3 L2 L1 POWER BLOCK 50 VA TRANSFORMER 24 VAC 75 VA TRANSFORMER 24 VAC TERMINAL STRIP 24 VAC COMPRESSOR 1 COMPRESSOR 2 FAN REVERSING VALVE CIRCUIT 2 RESET LIGHT DEHUMIDIFICATION CIRCUIT 1 C1 R PINK BLACK STRIPE Y1 Y2 G O L H E C2 1 2 BLUE YELLOW BLUE PINK BLACK PURPLE ORANGE PINK BLACK STRIPE 1 2 SEE NOTES 1 4 5 SEE NOTES 1 4 5 BLACK BLACK BLACK YELLOW BLUE 1R 3 1 4 5 2 CS L...

Страница 7: ...nal auto reset overloads 4 Insulate all unused wire ends 4 Both transformers must be phased identically L1 is always the transformer s black lead 5 The optional Water Temperature Switch WT is also included in the optional Low Temperature Package TL LEGEND Ground Compressor Contactor Circuit 1 Compressor Contactor Circuit 2 Blower Contactor Lockout Relay Circuit 1 Lockout Relay Circuit 2 Hot Gas Re...

Страница 8: ...OL WI D L3 L2 L1 POWER BLOCK BLACK 50 VA TRANSFORMER 24 VAC 3 5 2 1 4 WHITE YELLOW BLUE BLUE PINK PINK BLACK STRIPE PURPLE ORANGE BLACK PINK BLACK STRIPE 1 2 D Y1 Y2 R G C1 L H O C2 DEHUMIDIFICATION COMPRESSOR 1 COMPRESSOR 2 FAN 24 VAC LOCKOUT ALARM HOT GAS REHEAT REVERSING VALVE RV 5R C2 C1 5 3 4 1 2 6 CIRCUIT 2 CIRCUIT 1 HV 7R ...

Страница 9: ...included in the optional Low Temperature Package TL 5 Both transformers must be phased identically L1 is always the transformer s black lead 6 If Low Temperature Cutout Switch P N 71042410 is factory set at 33 F Its bulb is positioned across the discharge side of the preheat coil 7 Insulate all unused wire ends Ground Compressor Contactor Circuit 1 Compressor Contactor Circuit 2 Blower Contactor L...

Страница 10: ...AT JOHNSON CONTROLS INC METASYS MODEL AS UNT110 1 10 VA POWER REQUIREMENT 2 1 ON MA HS OT DA AF SET 0 25 SEE NOTE 4 BETWEEN THE ELECTRIC PRE HEAT AND EVAPORATOR COILS ON THE RETURN AIR DUCT FLANGE UPSTREAM OF THE AIR DAMPERS IN THE DISCHARGE AIR DUCTWORK IN THE DISCHARGE AIR DUCTWORK OUT COM POWER TEMP TEMP RED YELLOW TERMINAL STRIP 1 2 E Y1 Y2 R G C1 H L O C2 YELLOW BLUE BLUE PINK PINK BLACK STRI...

Страница 11: ...so included in the optional Low Temperature Package TL 8 Both transformers must be phased identically L1 is always the transformer s black lead 9 Johnson Controls Inc supplied jumper wire Remove this jumper wire only if using a separate load transformer by others 10 The use of three conductor shielded cable is required between relays 6R and 7R and the electric preheat control panel s terminal bloc...

Страница 12: ... 100 outside air unit with Johnson Metasys controls and hot water preheat wiring diagram NOTES 1 All units are factory wired to customer order For 208 volt units use the black and red transformer leads For 230 volt units use the black and orange transformer leads For 460 volt units use the black and black red strip transformer leads 2 Supply wiring must have copper conductors 3 An external manual ...

Страница 13: ...it 1 Lockout Relay Circuit 2 Lockout Signal Relay Hot Gas Reheat Relay Circuit 1 Cooling Relay Circuit 2 Low Temperature Lockout Relay Stage 2 Electric Preheat Relay PE Hot Gas Reheat Valve Circuit 1 4 Way Reversing Valve Circuit 2 HP High Pressure Switch 400 psi LP Low Pressure Switch 7 psi CS Condensate Switch Optional WT Water Temperature Switch Optional RS Random Start Relay 25 60 Seconds TD T...

Страница 14: ...on the outdoor air damper will open The controller will first examine the mixed air temperature If the outdoor air is below the set point of the mixed air sensor the preheat will be energized to increase the air temperature When the damper is fully open the fan will run continuously After the need for preheat is examined the controller then looks at the need for compressor cooling If the outdoor a...

Страница 15: ...re rise of 12 25 F could be anticipated at relatively low water flow rates Startup using thermostat A special thermostat supplied by others will be required for humidity control After installing the unit connecting ductwork water condensate lines and the wiring as described in the preceding instructions the unit is ready for startup Check all wire connections in the unit and to the external contro...

Страница 16: ...otect the unit s refrigerant system if refrigerant pressure exceeds either high or low limits If unsuitable pressure occurs the compressors will automatically shut down Some thermostats will indicate a compressor shutdown with a reset light If the compressor shuts down turn the controller system switch to the OFF position After approximately 10 minutes turn the controller system switch to ON and r...

Страница 17: ...igh leaving air temperature The air coil may not be wet Low Evaporator Temperature Undercharged Poor refrigerant distribution Low airflow clogged filter or air coil Excess oil in refrigerant air bypassing the coil Damaged fins on the coil or poor fin to tube bond Subcooling in Cooling Mode Subcooled refrigerant is found after the coax and before the TXV The liquid line is almost always subcooled T...

Страница 18: ...Small O Ring Large O Ring SPAN SCALE FORCE SCALE Belt Tension Checker 6 Read force scale under the small O ring to determine the force required to give the needed deflection 7 Compare the force scale reading with the correct value for the belt style and cross section used as given in Table 1 The force should be between the minimum and maximum values shown 8 If there is too little deflection force ...

Страница 19: ...________F Leaving Air ___________F___________F __________cfm Entering Water________F ___________F Leaving Water_________F___________F _________GPM Discharge___________PSI _________PSI Suction _____________PSI__________PSI Discharge____________F ___________F Suction______________ F ___________F Blower____________amps ________amps Superheat____________ F ___________F Compressor__________ F _________...

Страница 20: ...Mammoth Inc 952 361 2711 Fax 952 361 2870 Chaska Minnesota 55318 9663 101 West 82nd Street www mammoth inc com ...

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