Mammoth G-141-MHC Page 6 Installation, Operation And Maintenance Instructions Download

Page: 6 / 20

U-5 IOM

Figure 6. 100% outside air unit wiring diagram

208/230 or 460 VOLTS

60 HERTZ, 3 PHASE

SEE NOTE 2

CIRCUIT #1

COOLING ONLY (FIRST STAGE)

WITH HOT GAS REHEAT

(DEHUMIDIFICATION)

SEC

COMPRESSOR

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)

PINK/BLACK STRIPE

BLUE

YELLOW

BLUE

PINK

BLACK

PURPLE

ORANGE

PINK/BLACK STRIPE

SEE NOTES

1, 4 & 5

SEE NOTES

1, 4 & 5

BLA

YELLO

BLUE

Summary of Contents for G-141-MHC

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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 _________...

Page 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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