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Installation, Operation and Maintenance Manual

C13-Series

Subject to change without notice.

10.20-IM (0818)

Chilled Water Valves Or Hot Water

Valves

Chilled water or hot water valves, if supplied by United

CoolAir, are typically 2 way� The valve would be shipped

loose for installation in the field. The valve is to be mounted

in the outlet line of the coil�

Head Pressure Control Valves

Standard water-cooled units do not include a water regulating

valve for head pressure control� However, if the incoming

water to the unit will be at 65˚ or below, the unit should have

been ordered with Head Pressure Control Valve(s)�
A pressure transducer senses the liquid refrigerant pressure

leaving the heat exchanger and sends a signal to a pressure

controller� The controller then provides a modulating electrical

signal to the head pressure control valve to adjust the valve

open or closed to control the amount of water flow to maintain

a refrigerant pressure set point (factory set to 360 psig)�
The valve can be 2-way, 3-way or 2-way with a bypass

solenoid for heat pump applications

Economizer Operation (Airside)

The optional economizer setup utilizes outdoor air as

much as possible to maintain the temperature in the space

being conditioned� Airside Economizer uses outdoor air to

condition the space when the outdoor air enthalpy is less

than the indoor air enthalpy and the outdoor air enthalpy is

less than the Economizer Module’s enthalpy set point� To

ensure that the outside air conditions are suitable to operate

in the airside economizer mode, an outdoor air enthalpy

sensor and a return air enthalpy sensor must be installed at

locations where they can continuously monitor outdoor air

and return air conditions�
The outdoor air enthalpy sensor must be mounted in ambient

outdoor air at a location not influenced by radiant sunlight

or other radiating elements� If outdoor air is continuously

being supplied to the space being conditioned to satisfy

minimum fresh air requirements required by specific codes,

the Outdoor Air Enthalpy Sensor can be installed inside the

outdoor air ducting; otherwise, it must be installed outdoors in

the outdoor air intake plenum� Install the Return Air Enthalpy

Sensor in the return air duct before the return air damper�

Economizer Operation

When a call for cooling is initiated by the thermostat located

in the space being conditioned, and if the enthalpy conditions

are satisfied as sensed by the economizer module, the

outdoor air provided for cooling the space could be from a

small portion up to 100% total air flow of outdoor air. The

determination of how much outdoor air to use for cooling

is determined by additional sensors that monitor mixed and

discharge air temperatures�
These additional sensors are optional and when they

are used in the application, they limit the discharge air

temperature so that the discharge air does not become too

cold� If these optional sensors are not used, the module will

drive the dampers completely open for economizer and use

as much cold outdoor air as possible� Refer to the additional

instructions provided and electrical diagrams for installation

of Economizer Module, Enthalpy Sensors, and Setup and

Operating Instructions�
When the indoor air conditions are better than the outdoor

air conditions the Economizer Module will send a signal

to the compressors to use mechanical cooling instead of

economizer and limit the amount of outdoor air provided to

the setting of the minimum outdoor air set point�

Economizer Operation – (Waterside)

The waterside economizer is also referred to as a “free

cooling coil”�
The free cooling coil is installed before the DX cooling coil in

the return air stream�
A sensor is provided in the water inlet side of the water

cooled condenser� If the incoming water temperature is

below the control setpoint, a normally closed solenoid valve

opens and lets the water pass through the free cooling coil�

The refrigerant circuit is deactivated during the free cooling

economizer operation�

Condensing Section Outdoor

Modification Kit

This kit is available to attach to the outside con- denser/

condensing section (See Fig. 17). The air deflector

prevents condenser discharge air from re-circulating into

the condenser return air� The weather hood minimizes the

possibility of water and snow being pulled in� The screens

keep debris, wildlife and hands out of unit� A clearance

distance of 6 feet is preferable on the inlet/outlet face of the

section for adequate air flow with minimal re-circulation.

Split Condenser / Condensing

Sections

Condensers (without compressors) or condensing sections

(with compressors) are available for split applications, both

air and water-cooled� For condensers/condensing units to

be used with evaporator sections, other than United CoolAir

products, the units are supplied with the refrigerant lines

capped with only a holding charge of nitrogen�

Содержание C13-Series

Страница 1: ...C13 Series Installation Operation and Maintenance Manual Effective August 2018 Horizontal Air Cooled Water Cooled Chilled Water and Heat Pump ...

Страница 2: ......

Страница 3: ...Operation Other Than Heat Pump 19 Heat Pump Heating Sequence Of Operation 20 Options 20 Condensate Pump 20 Thermostat 21 Checking Hot Gas Bypass Valve 21 Adjustment Of Hot Gas Bypass Valve 22 Microprocessor Controller 22 Humidifier 22 Electric Heat 22 Electric Reheat 22 Steam Coil 22 Hot Water Coils 23 Flooded Condenser 23 Buck Boost Transformer 23 Chilled Water Valves Or Hot Water Valves 24 Head ...

Страница 4: ...oll to the footer section or Home industry resources enter your serial number in the Serial Search field and press return to retrieve your product wiring diagram Your serial number is a combination of the year month and sequential order of build date This action will return the Model number Job Number and the wiring diagram for viewing as well as downloading NOTE Only units shipped since November ...

Страница 5: ... minor or moderate injury if not avoided The information icon indicates a situation that may result in equipment or property damage The information provided alerts the reader to relevant facts and or conditions ELECTRICAL HAZARD WARNING CAUTION INFORMATION This publication includes warnings cautions and information icons that point out safety related issues or conditions as well as other pertinent...

Страница 6: ...ap Supply Air Cond Air Out Elect Box Coil Access Panel Coil Access Panel Motor Blower Access Panel Motor Blower Access Panel Elect Box Condensing Section Service Clearance All Sizes Left Side 36 Right Side 36 Tons A B C D E F G H J K L M N P Q R S T V W X Y Z AA AB AC AD 2 3 78 56 22 44 34 119 16 20 1 59 7 25 1011 16 91 16 3 57 40 1 30 91 16 3 24 35 16 13 119 16 7 111 16 19 4 5 86 64 25 46 40 13 9...

Страница 7: ...Control Wiring Evap Return Air Evap Supply Air Elect Box Elect Box Coil Access Panel Motor Blower Access Panel Compressor Access Panel Cond Section Service Clearance All Sizes Left Side 36 Right Side 36 Tons B C E F G H J K L M N P Q R S T W AE AF AG AH AJ AK Water Piping In Out 2 3 56 22 34 119 16 20 1 59 7 25 1011 16 91 16 3 57 40 1 30 3 50 16 12 6 91 8 13 Ø 4 5 64 25 40 13 9 16 25 0 67 81 16 31...

Страница 8: ...he unit to accommodate maintenance and servicing This minimum clearance must be 36 for all units Attention must also be given to floor ceiling or wall load limitations See Figure 2 Location should also provide for condensate removal trapping and disposal Discharge Air from condenser coil should be deflected away from supply air to condenser to prevent recirculation See also Condensing Section Outd...

Страница 9: ...rounded using the ground lug provided in the electrical box Metal conduit is not an acceptable ground h Run the low voltage wiring from the thermostat to the unit Connect to low voltage terminal block supplied See Thermostat under Options page 20 Wire Size1 AWG Gauge 22 20 19 18 16 40 120 150 190 305 Maximum Wire Length2 Feet Note 1 Solid Class II copper wire 2 Based on a voltage drop of 1 2 volts...

Страница 10: ...e rails attached to the unit mounting rails on each side of the unit 7 Carefully pull the evaporator section away from the condensing section 8 Verify that the self sealing couplings are completely disengaged and not leaking refrigerant The sections may now be moved to their individual locations for installation either floor mounted or hung Interconnecting Refrigerant Tubing After the separated se...

Страница 11: ...lied The interconnect kit also contains four 4 Schrader fittings The installer can place at least one in each refrigerant line or at the end of the refrigerant line These enable the refrigerant line to be evacuated and charged as needed based on size and length In some situations the desired refrigerant line size may differ from the self sealing fitting size provided The line size should be reduce...

Страница 12: ... components 6 Install the Schrader valve fittings into the tubing before brazing the couplings onto the ends of the tubing Use a 1 4 hole to mount the valve Clean and debur the tubing before doing any brazing to ensure that no chips or debris are left in the refrigerant circuit Remove the Schrader valve cap and core before doing any brazing 7 Leak check line sets with nitrogen at 500 psig After br...

Страница 13: ...experienced Duct Connection It is recommended to use a flex collar or other means to isolate any unit vibration from being transmitted to the duct or structure Ductwork and plenums shall be insulated in accordance with applicable ASHRAE standards or local codes Pressure Switches High Pressure This switch shuts the unit down in the event of excessive high pressure in the discharge line A manual res...

Страница 14: ...not use for brackish water or salt water unless appropriate condenser has been installed as an option Condensate Drain Connection Units are equipped with two 3 4 IPS drains one for the evaporator condensate one for the condensing section All units require evaporator section drains to be installed Heat pumps and water cooled condensing units also always require the installation of a condensing sect...

Страница 15: ... However there are several other commercially available environmentally safe products on the market that will do an excellent job Contact your local wholesaler for availability Follow all safety guidelines published by the cleaner manufacturer There is a safety concern whenever using any chemical cleaner at elevated temperatures The cleaner manufacturers recommend using the cleaners at 120 F or lo...

Страница 16: ...es and tank from heat exchanger 13 Flush entire water system with water 14 Return heat exchanger and system components to service Check all valves and fitting connections 15 Record performance values Before After Pressure Drop_____________Psig ____________ Psig Entering Temp _____________ F ____________ F Leaving Temp ______________ F ____________ F Blowers Disconnect power and lockout service bef...

Страница 17: ... air flow may result in excessive condensation at air outlets short cycling or total unit shutdown due to evaporator coil icing INFORMATION Verify that the motor current draw does not exceed the motor nameplate current by more than 10 Blower Motor Lubrication Motor manufacturers indicate that motors never need re lubrication but if units run continuously it is recommended that they be re lubricate...

Страница 18: ...igh condensing pressures resulting in higher power consumption and possibly system shut down by high pressure safety control A dirty evaporator coil will reduce unit capacity and eventually will cause shut down by the low pressure safety control Minimum Service Access All Service and Maintenance access is through both sides of the unit 36 clearance is required Application Data 208 230 460 Voltage ...

Страница 19: ...red the second compressor should then start g Set room thermostat at desired space temperature and the Fan switch to AUTO or ON The unit will cycle as required to maintain conditions 4 Chilled water sequence is the same as above except compressor activation is replaced by the chilled water valve function 5 Heat pump cooling sequence is the same as above except the reversing valve will also be acti...

Страница 20: ... at desired space temperature Set the Fan switch to AUTO or ON The unit will cycle as required to maintain conditions Options Condensate Pump If an optional condensate pump is to be used it will be mounted external to the unit The pump incorporates mounting tabs for securing the pump in a suitable location If the unit is an air source heat pump the unit drains from the evaporator and the condensin...

Страница 21: ...he suction line 3 Connect a high pressure refrigerant gauge to the liquid line 4 Operate air conditioner in the cooling mode until system is stabilized Approximately 15 minutes 5 If the high side pressure is not at or above 400 psig block off the condenser inlet air stream until the pressure is above this threshold This will simulate a system performance level close to the design condition of 95 F...

Страница 22: ...unctions on the electrode principle As water fills the plastic steam generator it immerses metal electrodes which then permits electrical current flow through the water This current flow produces heat which then boils the water into steam This steam is then injected on the downstream side of the cooling coil to provide humidification for the area being served by the unit Water is replenished throu...

Страница 23: ...the condenser This raises the condenser pressure Since it is the receiver pressure that is being maintained the valve will then start to throttle open the discharge port when the differential between the condensing pressure and the receiver pressure exceeds 20 psi The hot discharge gas serves to heat up the cold liquid being passed from the condenser to the receiver Thus the liquid reaches the rec...

Страница 24: ... located in the space being conditioned and if the enthalpy conditions are satisfied as sensed by the economizer module the outdoor air provided for cooling the space could be from a small portion up to 100 total air flow of outdoor air The determination of how much outdoor air to use for cooling is determined by additional sensors that monitor mixed and discharge air temperatures These additional...

Страница 25: ...on REAR LEFT RIGHT Refrigerant Quick Connects Field Installation Power Control Wiring Elect Box Motor Blower Access Panel Clearance Hole for Hanging Rod Typ 8 Pls Optional HGR Optional HGR Suction Optional HGR Liquid Suction Optional HGR Liquid Service Clearance All Sizes Left Side 36 Right Side 36 Optional HGR Optional HGR Suction Optional HGR Liquid Optional HGR Optional HGR Suction Optional HGR...

Страница 26: ...ndensing section for location in small spaces Evaporator discharge air is available through the front or top for easy duct installation INFORMATION NOTE For other sheet metal arrangements contact your local sales office A rigid frame system supports the evaporator and provides vibration free operation Quick connect couplings allow the unit to be split in the field if needed for installation The in...

Страница 27: ... Field Installation Power Control Wiring RIGHT LEFT Clearance Hole for Hanging Rod Typ 8 Pls Service Clearance All Sizes Left Side 36 Right Side 36 TONS B C D E F G H J K L M N P 2 3 56 22 44 34 115 16 20 1 59 7 25 1011 16 91 16 3 4 5 64 25 46 40 139 16 25 0 67 81 16 31 12 91 16 3 6 8 70 32 63 45 18 31 73 65 8 39 161 16 613 16 15 8 TONS Q R S T V X Y Z AA AB AC AD AM 2 3 57 40 1 30 91 16 24 35 16 ...

Страница 28: ... recharge refrigerant system Check condenser for obstructions and remove Check for the required water flow through the water regulating valve and the condenser coil Manually reset thermostat With Marvel turn off alarm and reset Wait for PTCR to cool off Compressor should start in 3 5 minutes Stop unit and troubleshoot power supply and compressor circuit for low voltage Please note that it may take...

Страница 29: ...d compressor bearings Liquid slugging Excessive head pressure Ensure thermal expansion valve bulb is tight on suction line Con firm that bulb is located properly on suction line Check operation and superheat Replace compressor Replace compressor System overcharged Reclaim excess refrigerant from the high side of the system Reduce head pressure see item 8 below 7 System short of capacity Flash gas ...

Страница 30: ...d 10 Suction pressure too low Flash gas in liquid line bubbles in sight glass due to a leak Obstructed expansion valve Loss of fluid within expansion valve bulb Clogged filter drier Ice or dirt on evaporator coil Evaporator blower running backwards Repair leak and recharge Repair or replace valve Replace power head and valve Replace with new filter drier Defrost and clean evaporator coil and repla...

Страница 31: ...e freely Dirt or algae not allowing float to activate pump Locate and repair electrical connection problem Clean pump and float Clean pump and float 15 Condensate Pump runs with no discharge Tubing blocked or kinked Check valve blocked Inpeller blocked Tubing elevation or run exceeds head capability Inspect clean or straighten as necessary Clean check valve Remove debris from pump impeller Verify ...

Страница 32: ...de of condenser and evaporator 9 Damages resulting from I freezing of condenser water or condensate II use of corrosive water III fouling or restriction of the air water circuit by foreign material or like causes 10 Damages resulting from operation with inadequate or interrupted supply of air or water 11 Damages resulting from use of components or accessories not approved by United CoolAir 12 This...

Страница 33: ...or like causes 10 Damages resulting from operation with inadequate or interrupted supply of air or water 11 Damages resulting from use of components or accessories not approved by United CoolAir 12 This warranty does not apply to the installation plumbing and wiring not integral to the product 13 Damages resulting from improper application or sizing This warranty is in lieu of all other warranties...

Страница 34: ...ir 12 This warranty does not apply to the installation plumbing and wiring not integral to the product 13 Damages resulting from improper application or sizing of unit 14 In the event that the refrigerant type is changed as a result of a compressor failure and the same type of compressor is not available any subsequent refrigerant circuit component failures will not be covered under the Limited Wa...

Страница 35: ...sories not approved by United CoolAir 12 This warranty does not apply to the installation plumbing and wiring not integral to the product 13 Damages resulting from improper application or sizing 14 Discharge air temperature control if not provided by the factory will void the compressor Limited Warranty 15 In the event that the refrigerant type is changed as a result of a compressor failure and th...

Страница 36: ...ooded condenser option the scroll compressors will have crankcase heaters If the outdoor ambient is 70 F or lower let the compressors sit for approximately 24 hours before proceeding 12 Record the voltage at the unit terminals 13 If possible with the thermostat provided switch the evaporator blower to the RUN position Verify that the evaporator blower is activated 14 Verify that the evaporator blo...

Страница 37: ...ressures on each compressor circuit are within the proper limits i 290 550 Discharge ii 100 140 psig Suction b Compressor Amperage is below the RLA Amps listed on the unit data tag i The maximum compressor operating current amps at start up depends a lot on the system loading The lower the load the less the current The higher the load the higher the current c The blower motor FLA values should nev...

Страница 38: ...act the Distributor Is the Circuit Protection the correct type and does it meet the unit data tag requirements Yes ____________ No ____________ If not correct describe what action s have been taken to correct Unit controller wiring verified Yes ____________ No ____________ C Terminal hooked up if necessary Yes ____________ No ____________ Unit leak checked OK Yes ____________ No ____________ If le...

Страница 39: ..._______ F_________ F_________ F_________ Sub cooling _________ _________ Electrical Evap Motor Amps L1_____________ L2____________ L3_____________ Compressor 1 Amps L1_____________ L2____________ L3_____________ Compressor 2 Amps L1_____________ L2____________ L3_____________ Cond Motor Amps L1_____________ L2____________ L3_____________ Heating Mode Optional System Air Temperatures Return F _____...

Страница 40: ...for approximately 24 hours before proceeding 12 Record the voltage at the unit terminals 13 If possible with the thermostat provided switch the evaporator blower to the RUN or ON position Verify that the evaporator blower is activated 14 Verify that the evaporator blower is rotating in the correct direction three phase units only Note If the evaporator blower motor runs backwards shut off all powe...

Страница 41: ...ding to the liquid line pressure 32 Calculate and record the liquid sub cooling for each circuit by taking the difference between the liquid line temperature and the saturation temperature corresponding to the liquid line pressure 33 Record the Amps for the evaporator blower motor and each compressor If the system is single phase use L1 and L2 only a Make sure the pressures on each compressor circ...

Страница 42: ... Is the Circuit Protection the correct type and does it meet the unit data tag requirements Yes ____________ No ____________ If not correct describe what action s have been taken to correct Unit controller wiring verified Yes ____________ No ____________ C Terminal hooked up if necessary Yes ____________ No ____________ Unit leak checked OK Yes ____________ No ____________ If leak was located desc...

Страница 43: ...sor 2 Suction Pressure Suction Line Temperature psi________ F_________ psi________ F_________ Saturation Temperature F_________ F_________ Suction Superheat _________ _________ Liquid Line Pressure psi________ psi________ Saturation Temperature Liquid Line Temperature F_________ F_________ F_________ F_________ Sub cooling _________ _________ Electrical Evap Motor Amps L1_____________ L2__________...

Страница 44: ...nit 2 thru 8 Tons MW Water Cooled MagnaCool Unit 2 thru 8 Tons CCW Chilled Water Unit 2 thru 8 Tons E Evaporator Section only of the unit 2 thru 8 Tons can be a prefix for some of the above B Condensing Section only of the unit 2 thru 8 Tons BC Condenser Section only of the unit 2 thru 8 Tons b 2 3 4 5 6 8 Nominal Cooling Capacity in Tons c G Common to all d 1 3 4 or 5 Indicates Voltage 1 208 230V...

Страница 45: ... on the compressor labor not included Maintenance items such as filters and belts are excluded under this limited warranty FACTORY TESTED All units are functionally run tested before shipment to ensure a trouble free start up and unit commissioning Industry proven components are used throughout to enhance system reliability and peace of mind VertiCool Classic Vertical 3 30 Ton VertiCool Aurora Ver...

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