Downow Discharge, Horizontal Discharge
High Efciency Rooftop
Water Source Heat Pumps
RWD, RGD, RWH, RGH
RWD 060
RWH 060
McQuay Rooftop Water Source Heat Pumps
Model RWD, RGD – Downow Discharge
Standard Features: Optional Features:
Heavy duty cabinet construction. Geothermal operation.
Downowandhorizontaldischargearrangements. Hot gas by-pass.
Rated in accordance with ARI ISO 13256-1. Hot gas reheat.
3 to 35 ton (14 to 123 kW) capacity. Economizer.
Full perimeter roof curb. Multiplefanmotorsizes.
Multiple access panels. Baked phenolic coil coatings.
Fully insulated. Single wall cupronickel coaxial heat exchanger.
Crankcase heaters. R407C refrigerant
Electric controls. Harsh environment protection plus –
Sloped stainless steel drain pan. (includes thermoguard coating on evaporator
Multiple refrigerant circuits, 8 tons (28 kW) and up. and hot gas reheat coils).
Factory tested.
RWD 060
Model RWH, RGH – Horizontal Discharge
Standard Features: Optional Features:
Heavy duty cabinet construction. Geothermal operation
Horizontaldischargearrangement. Hot gas by-pass.
Rated in accordance with ARI ISO 13256-1. Hot gas reheat.
3 to 35 ton (14 to 123 kW) capacity. Economizer.
Roof curb. Multiplefanmotorsizes.
Multiple access panels. Baked phenolic coil coatings.
Fully insulated. Single wall cupronickel coaxial heat exchanger.
Crankcase heaters. R407C refrigerant
Electric controls. Harsh environment protection plus
Sloped stainless steel drain pan.
Multiple refrigerant circuits, 8 tons (28 kW) and up.
Factory tested.
RWH 060
“McQuay” is a registered trademark of McQuay International.
The information in this catalog supersedes and replaces previous catalogs with regard to McQuay Terminal Air Conditioning products. Illustrations cover the gener-
al appearance of McQuay products at the time of publication and McQuay reserves the right to make changes in design and construction at anytime without notice.
Catalog 1110 Rooftop Water Source Heat PumpsPage 1 of 62
B = Bottom (Code 02 must be RWD, RGD)
E = End Discharge (Code 02 must be RWH, RGH)
Return Air
B = Bottom (Code 02 must be RWD, RGD)
H=Horizontal(Code02mustbeRWH,RGH)
Cabinet Height
Y = None
Voltage
F = 208-230/60/3
K = 460/60/3
Design Features – RWD, RGD
Model RWD, RGD –
High Efciency Rooftop
Downow Discharge
RWD 060
Application
Packaged curb mounted vertical supply and return water
to-air heat pump air conditioners are an excellent choice for
a multitude of building applications ranging from ofce,
schools, health care and retirement facilities to hotels and
motels, and industrial operations. The RWD models are
normally used with a water loop system utilizing a cooling tower and boiler, this unit is designed to operate with
entering water temperatures between 55oF and 95oF. The
RGD models are rated for ground loop heat exchanger ap-
plication with entering uid temperature between 30oF and
100oF. All units are rated in accordance with ARI Standard
ISO 13256-1.
These outdoor roof mounted units are positioned on the
factory supplied roof curb, above the conditioned space,
for minimal eld ductwork. After assembly each unit is
charged and run tested in both the heating and cooling
cycles for reliable operation. Units are design certied to
conform to appropriate UL/ANSI Standards by ETL.
Paint Finish
The unit is constructed of hot dipped galvanized G-90 steel
that is chemically treated with zinc phosphate, coated with
0.2 to 0.3 MIL polyurethane primer then nished with 0.7
to 0.8 MIL polyester top coat. Finish meets or exceeds a
1,000 hour Salt Spray Test per ASTM B117-97.
Non-rust Sound Attenuating Base Pan
Unit base pans are fabricated from 16-gauge G-90 galva-
nized steel which is lled with viscous petroleum distillate
to a uniform 1/4" wet depth, air dried, and cured to form a
solid protective layer to resist corrosive oxidation.
Air handling sections have an additional layer of 24-gauge
aluminum that covers and encapsulates the corrosion
protection. A layer of 3/8" thick closed cell insulation is
applied to the bottom of the base to provide thermal insulation, sound attenuation and curb perimeter seal.
Non-Corroding Hardware
Exterior nuts, bolts and washers are stainless steel. Exterior
screws are steel coated with Magnigard Silver 17, an epoxy
nish containing aluminum ake pigment that meets or
exceeds a 10,000 hour Salt Spray Test per ASTM B117-97.
Compressor
Models 036 and 048 equipped with high efciency reciprocating compressors. All other models are equipped with
scroll compressors selected for their reliability and high
efciency.
Compressor mountings are designed to reduce vibration
transmission to the unit structure and minimize piping
stress.
Standard Design Features
Heavy Duty Cabinet
All models are constructed of G-90 galvanized steel. Bases
are 16-gauge, corner posts are 18-gauge, access panels are
20-gauge and top pans are 18-gauge. The interior of the en-
tire unit is thermally insulated with 1-inch thick berglass
with an R value of 4.2. Insulation surface exposed to the
air stream is nished with acrylic coating that is resistant to
air erosion. The design of the cabinet allows access to the
electrical panel without impairing unit operation.
Compressor Compartment
Catalog 1110 Rooftop Water Source Heat PumpsPage 3 of 62
Design Features – RWD, RGD
Compressor Protection
All compressors have crankcase heaters and internal overheat protection.
Compressor Control Module
The sequence begins with a three second start delay, a
ninety second bypass of low pressure cutout switch at start-
up, and a ve minute anti-short-cycle time delay (delay
begins upon opening of thermostat). Compressor operation
is locked out upon opening of high-pressure cutout or low
pressure cutout (after 90 second start-up delay expires).
Units can be reset remotely at a thermostat or by removing
and reapplying power to unit. Units can be switched to 24-
vac output for remote fault indication (eld option).
Separate Refrigeration Circuits
Multiple refrigeration circuits are standard on sizes 096
thru 420. Multicompressor models provide the added
benet of partial standby. Also, they provide two-stage
operation with one compressor being activated from the
rst stage of the two-stage space thermostat on the cooling
cycle. On the heating cycle, all compressors are activated
by the rst stage of the space thermostat.
Indoor Air Coil
The indoor air coils have aluminum ns formed on multiple
rows of seamless copper tubing arranged in a staggered
tube conguration. The tubes are mechanically expanded,
rmly bonding the tube to the collar of each n.
The Coaxial Water Coil
The Coaxial Water Coil consists of an enhanced surface
inner copper tube with outer steel tube (tube-in-tube).
Water connections are stubbed off inside the cabinet. Field
piped return and supply water lines enter through individual
sleeves in the compressor base pan section after passing
through the roof curb. Units are shipped with water pressure taps and upper elbows for easy connection to the water
source. RGD models are equipped with fully insulated refrigerant and water lines and a polyurethane foam encased
coaxial water coil.
Evaporator Blower and Motor
A forward-curved, statically and dynamically balanced
DWDI centrifugal blower(s) is used for the supply air.
Blower wheels are fabricated of galvanized steel. Blower
housings are fabricated of galvanized or epoxy coated steel.
The blower wheel(s) is mounted on a solid steel shaft supported by sealed ball bearings. The shaft is belt driven with
adjustable drive sheaves connected to a nominal 1725-rpm
motor with sealed ball bearings. The sealed bearings on
both the blower shaft and motor are permanently lubricated.
Motors up to 3 horsepower are internally protected (auto
reset) and motors 5 horsepower and larger are externally
protected (manual reset).
Blower and Motor Compartment
Foam Encased Coaxial Water Coil
Page 4 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Design Features – RWD, RGD
Refrigerant Circuit
Included in each refrigerant circuit is a reversing valve,
high-pressure unit protection control, low pressure unit
protection control/loss of charge protector , dual gauge con-
nections for high and low pressure readings, and a bi-ow
thermostatic expansion valve. The expansion valve has adjustable superheat and distributors to meter the refrigerant
evenly to the evaporator refrigerant circuits. The 24-volt
reversing valve is energized in the cooling mode, making it
fail safe to the heating mode.
Factory-installed service ports in compressor suction, discharge and liquid lines are included for ease of servicing. A
common refrigerant line connection is also provided for use
with water regulating valves.
Electric Controls
Internally wired controls include the compressor control
module, reversing valve relay, fan relay and the blower and
compressor motor contactors or starters mounted in a sheet
metal control panel. The isolated 24-volt control circuit
includes a transformer and low voltage terminal board for
external thermostat control hookup.
Terminal Board Connections
Terminal boards are furnished for 24-volt thermostat connections on units.
Sloped Stainless Steel Condensate
Drain Pan
The condensate drain pan is sloped to comply with
ASHRAE Standard 62-1089R and fabricated from stainless steel. The bottom is insulated with 5/8" closed cell
neoprene insulation. Condensation may be drained from
either side of the unit from MPT drain ttings positioned at
the exterior of each side of the cabinet (sizes 036, 048, 060,
and 072 are equipped for one side drain only).
Power Entry
Power entering through the curb sleeves is standard in all
models.
Multiple Refrigeration Circuits
Unit sizes 096 and larger use either two or three separate
refrigeration circuits. This design offers two stages of
cooling for load shedding when conditions allow. Three
compressor units energize two of the refrigeration circuits
for the rst stage of cooling and the third is reserved for
maximum conditions. The heating cycle uses all three circuits at start up and unloads one circuit as conditions allow.
Multiple compressors on independent circuits also offer
the added benet of continuous operation in the event of a
failure in one of the circuits.
Filters
All models are shipped with 2-inch thick disposable glass
ber media lters mounted in a factory installed at lter
rack on the return air opening.
Control Board
Disposable Glass Fiber Media Filter
Catalog 1110 Rooftop Water Source Heat PumpsPage 5 of 62
Cooling capacity is based on 80.6oF (27oC) db, 66.2oF (19oC) wb entering air temperature and 86oF (30oC) entering, 95oF (35oC) leaving water temperature. Heating
capacity based on 68oF (20oC) db entering air temperature and 68oF (20oC)enteringwater temperature.Netcapacitiesincludefanmotorheat;50cycleunitsare
derated, 60 cycle units.
/s GPM L/s
VOLTAGE
BTU
/HR WATTS EER BTU/HR WATTS COP
Catalog 1110 Rooftop Water Source Heat PumpsPage 7 of 62
Cooling capacity is based on 80.6oF (27oC) db, 66.2oF (19oC) wb entering air temperature and 77oF (25oC) entering, 87oF (31oC) leaving water temperature. Heating
capacity based on 68oF (20oC) db entering air temperature and 32oF (0oC)entering watertemperature. Netcapacities includefanmotorheat;50 cycleunits are
derated, 60 cycle units.
/s GPM L/s
VOLTAGE
BTU
/HR WATTS EER BTU/HR WATTS COP
Page 8 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Fan Motor Total Unit Min./Max. Min. Circuit Max Fuse
Page 10 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWD, RGD 036
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
Condenser Water Flow Cooling Performance Correction Factors
Cooling Pressure Total Heat Sensible
Cycle gpm
Design ∆T psi Ft.HD. Btu/h
o
8
10
12
14
16
20
10.6 7.2 16.6 1.005 0.987 1.002 1.001 1.02
o
8.6 4.7 10.9 1.000 1.000 1.000 1.000 1.00
o
7.1 3.1 7.2 0.987 1.012 0.992 0.996 0.98
o
6.1 2.3 5.4 0.973 1.025 0.985 0.992 0.95
o
5.3 2.0 4.6 0.960 1.037 0.977 0.988 0.93
o
4.3 1.2 2.8 0.958 1.054 0.973 0.980 0.91
Drop
Capacity
Watts
Rejection Capacity EER
Input
Btu/h Btu/h
Notes:
1. Above ratings are based on 80
o
F dbt, 67oF
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
o
EWT based
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
1110 Rooftop Water Source Heat PumpsPage 11 of 62
Capacity Data – RWD, RGD 048
Table 9c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
Various65 1.007 1.019 0.963
Entering Air oF 70 1 1 1
dbt Temperature75 0.993 0.981 1.07780 0.986 0.961 ––
Notes:
1. Above ratings are based on 80
2. Above ratings do not include allowance
3. Heating ratings below 45
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
Multipliers
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
o
EWT based
on the use of 20% methanol/water anti-
freeze.
o
F dbt, 67oF
Capacity Data – RWD, RGD 060
Table 10c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
o
F dbt, 67oF
EWT based
1110 Rooftop Water Source Heat PumpsPage 13 of 62
Capacity Data – RWD, RGD 072
Table 11c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
o
EWT based
on the use of 20% methanol/water anti-
freeze.
o
F dbt, 67oF
Capacity Data – RWD, RGD 096
Table 12c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
1. Above ratings are based on 80
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
1110 Rooftop Water Source Heat Pumps Page 15 of 62
o
F dbt, 67oF
o
EWT based
Capacity Data – RWD, RGD 120
Table 13c. Heating
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
for water pump power consumption.
on the use of 20% methanol/water anti-
freeze.
o
EWT based
o
F dbt, 67oF
Capacity Data – RWD, RGD 150
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
F dbt, 67oF
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
o
EWT based
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
Catalog 1110 Rooftop Water Source Heat PumpsPage 17 of 62
Capacity Data – RWD, RGD 180
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.
Condenser Water Flow Cooling Performance Correction Factors
Cooling Pressure Total Heat Sensible
Cycle gpm
Drop
Capacity
Design ∆T psi Ft.HD. Btu/h
8o 53 8.3 19.2 1.005 0.987 1.002 1.001 1.02
o
10
12
14
16
20
42 5.3 12.2 1.000 1.000 1.000 1.000 1.00
o
36 3.9 9.1 0.987 1.012 0.992 0.996 0.98
o
31 3.9 9.1 0.973 1.025 0.985 0.992 0.95
o
27 3.0 7.0 0.960 1.037 0.977 0.988 0.93
o
21 1.9 4.3 0.958 1.054 0.973 0.980 0.91
Watts
Rejection Capacity EER
Input
Btu/h Btu/h
Notes:
1. Above ratings are based on 80
o
F dbt, 67oF
wbt entering air in cooling, 70oF dbt in
heating. For other entering air conditions
see correction factor charts.
2. Above ratings do not include allowance
for water pump power consumption.
3. Heating ratings below 45
o
EWT based
on the use of 20% methanol/water anti-
freeze.
4. Interpolation of ratings is permitted.
5. Above ratings are at 208 volts.
Page 18 of 62 Rooftop Water Source Heat Pumps Catalog 1110
Capacity Data – RWD, RGD 240
Cooling capacities shown are gross capacities. For net capacities,
multiply blower bhp required times 2545 Btu per bph and subtract
from total and sensible in tables.