INSTALLATION INSTRUCTIONS
R-410A Single-Package Rooftop
Gas Heat/Electric Cooling
RGH 181-303
RGH horizontal 17.5 and 20 ton units for installation in the United States contain use of a 2-speed indoor fan
control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of 2018.
RGH units for installation outside the United States may or may not contain use of a 2-speed indoor fan
control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the 2-speed indoor fan system refer to the Variable Frequency Drive
(VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and Troubleshooting manual.
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1,2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-40
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . . . . . 9
Step 2 — Plan for Sequence of Unit Installation . . . . . . 10
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . . . . 11
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . . . . 15
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . 15
Step 7 — Horizontal Duct Connection . . . . . . . . . . . . . . . 16
Step 8 — Install Outside Air Hood — Factory Option . 16
Step 9 — Install Flue Hood and Combustion Air Hood 17
Step 10 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . . 17
Step 11 — Install External Condensate Trap and Line . 19
Step 12 — Make Electrical Connections . . . . . . . . . . . . . 20
Hot Gas Re-Heat System Control Connections . . . . . . . . 24
EconoMi$er® X (Factory-Installed Option) . . . . . . . . . . . 25
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Step 13 — Adjust Factory-Installed Options . . . . . . . . . . 40
Step 14 — Install Accessories . . . . . . . . . . . . . . . . . . . . . . 40
Step 15 — Check Belt Tension . . . . . . . . . . . . . . . . . . . . . 40
Pre-start and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
START-UP CHECKLIST. . . . . . . . . . . . . . . . . . . . CL-1, CL-2
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 packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local
building codes and appropriate national electrical codes (in
USA, ANSI/NFPA 70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the
safety-alert symbol
. When you see this symbol on the unit
and in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert
symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices, which may result
in minor personal injury or product and property damage. NOTE
is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect gas piping from unit when leak testing at pressure greater than 0.5 psig (3450 Pa). Pressures greater than
0.5 psig (3450 Pa) will cause gas valve damage resulting in
hazardous condition. If gas valve is subjected to pressure
greater than 0.5 psig (3450 Pa), it must be replaced before
use. When pressure testing field-supplied gas piping at
pressures of 0.5 psig (3450 Pa) or less, a unit connected to
such piping must be isolated by closing the manual gas
valve.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lock(s) and lockout tag(s). Unit may have more than one
power switch.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
Puron® (R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron refrigerant equipment.
509 01 3813 00
01/09/2018
WARNING
CAUTION
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from refrigerants and oils.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing air-conditioning
equipment.
Rated Indoor Airflow (cfm) — Table 1 lists the rated indoor airflow used for the AHRI efficiency rating for the units
covered in this document.
Table 1 — Rated Indoor Airflow
MODEL NUMBER
RGH 181/183
RGH 210/213
RGH 240/243
RGH 300/303
2
FULL LOAD AIRFLOW
(CFM)
4900
5700
6500
8125
MODEL SERIES
R
G
H
1
8
1
L
D
B
B
0
A
A
T
Position Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R = Rooftop
Type
G = Gas Heat/Elect Cool
H = High Efficiency
Efficiency
181 = 180,000 BTUH - 15 tons (2-stage cooling) Vertical SA/RA
183 = 180,000 BTUH - 15 tons (2-stage cooling) Horizontal SA/RA
210 = 180,000 BTUH - 17.5 tons (2-stage cooling) Vertical SA/RA
213 = 180,000 BTUH - 17.5 tons (2-stage cooling) Horizontal SA/RA
240 = 240,000 BTUH - 20 tons (2-stage cooling) Vertical SA/RA
243 = 240,000 BTUH - 20 tons (2-stage cooling) Vertical SA/RA
300 = 240,000 BTUH - 25 tons (2-stage cooling) Vertical SA/RA
303 = 240,000 BTUH - 25 tons (2-stage cooling) Vertical SA/RA Nominal Cooling Capacity
H = 208/230−3−60
L = 460−3−60
S = 575−3−60
Voltage
D = Low Heat, Aluminum Hx
E = Med Heat, Aluminum Hx
F = High Heat, Aluminum Hx
S = Low Heat, Stainless Steel Hx
R = Med Heat, Stainless Steel Hx
T = High Heat, Stainless Steel Hx
Heating Capacity
A = Standard Motor
B = High Static Motor
C = Medium Static Motor ( Standard or High Efficiency)
E = High Static - High Efficiency Motor
F = Medium Static - High Efficiency Motor
G = High Static Motor with Hot Gas Re-Heat
H = High Static Motor with Hot Gas Re-Heat
Motor Option (Indoor Fan)
A = None
B = Temp Economizer w/Baro-relief
E = Temp Economizer w/Baro−relief + CO2 Sensor
H = Enthalpy Economizer w/Baro-relief
L = Enthalpy Economizer w/Baro-relief + CO2 Sensor
U = Temp Ultra Low Leak Economizer w/Baro−relief
W = Enthalpy Ultra Low Leak Economizer w/Baro−relief
P = 2−Position damper
Outdoor Air Options / Control
0A = No Options
4B = Non−Fused Disconnect Switch
AA = Hinged Access Panels
AT = Un-Powered Convenience Outlet
BB = Powered Convenience Outlet
BP = Return Air Smoke Detector
BR = Supply Air Smoke Detector
Factory Installed Options
A = Standard Al Fin/Cu Tubes
B = Pre-coated Condenser Coil
C = E−Coated Condenser Coil
Condenser / Evaporator Coil Configuration
A = Standard Single Speed Indoor Fan Motor. For W7212 Controls
B = Standard Single Speed Indoor Fan Motor. For W7220 Controls
T = Two Speed Indoor Fan Motor with Variable Frequency Drive (VFD)
Motor Type Option
Fig. 1 — Model Number Nomenclature (Example)
3
Fig. 2 — Unit Dimensional Drawing — RGH 181 and 183
4
181/183
Fig. 2 — Unit Dimensional Drawing — RGH 181 and 183 (cont)
5
210/213
240/243
Fig. 3 — Unit Dimensional Drawing — RGH 210, 213, 240 and 243
6
210/213
240/243
Fig. 3 — Unit Dimensional Drawing — RGH 210, 213, 240 and 243 (cont)
7
Fig. 4 — Unit Dimensional Drawing — RGH 300 and 303
8
300/303
Fig. 4 — Unit Dimensional Drawing — RGH 300 and 303 (cont)
INSTALLATION
contaminated air. For proper unit operation, adequate
combustion and ventilation air must be provided in accordance
with Section 5.3 (Air for Combustion and Ventilation) of the
National Fuel Gas Code, ANSI Z223.1 (American National
Standards Institute) and NFPA (National Fire Protection
Association) 54 TIA-54-84-1. In Canada, installation must be
in accordance with the CAN1-B149 installation codes for gas
burning appliances.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto the
unit.
Locate mechanical draft system flue assembly at least 4 ft
(1.2 m) from any opening through which combustion products
could enter the building, and at least 4 ft (1.2 m) from any adjacent building (or per local code). Locate the flue assembly at
least 10 ft (3.05 m) from an adjacent unit’s fresh air intake hood
if within 3 ft (0.91 m) of same elevation (or per local code).
When unit is located adjacent to public walkways, flue assembly must be at least 7 ft (2.1 m) above grade.
Select a unit mounting system that provides adequate height
to allow installation of condensate trap per requirements. Refer
to Step 11 — Install External Condensate Trap and Line for required trap dimensions.
Jobsite Survey — Complete the following checks before
installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installation
requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location — Select a location
for the unit and its support system (curb or other) that provides
for at least the minimum clearances required for safety. This includes the clearance to combustible surfaces, unit performance
and service access below, around and above unit as specified in
unit drawings. See Fig. 5.
NOTE: Consider also the effect of adjacent units.
Be sure that the unit is installed such that snow will not
block the combustion air intake or flue outlet.
Unit may be installed directly on wood flooring or on Class
A, B, or C roof-covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents, relief valves, or other sources of
9
C
D
B
LOCATION
A
DIMENSION
48-in. (1219 mm)
18-in. (457 mm)
18-in. (457 mm)
12-in. (305 mm)
42-in. (1067 mm)
36-in. (914 mm)
Special
36-in. (914 mm)
18-in. (457 mm)
48-in. (1219 mm)
42-in. (1067 mm)
36-in. (914 mm)
Special
CONDITION
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
A
Recommended service clearance
Minimum clearance
Surface behind servicer is grounded (e.g., metal, masonry wall)
B
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Check sources of flue products within 10-ft of unit fresh air intake hood
Side condensate drain is used
C
Minimum clearance
No flue discharge accessory installed, surface is combustible material
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
D
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Check for adjacent units or building fresh air intakes within 10-ft (3 m) of this
unit’s flue outlet
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhea
obstruction or for vertical clearances.
Fig. 5 — Service Clearance Dimensional Drawing
Install condensate line trap and piping
Make electrical connections
Install other accessories
ROOF MOUNT — Check building codes for weight distribution requirements. Unit operating weight is shown in
Table 1.
Step 2 — Plan for Sequence of Unit Installation —
PAD-MOUNTED INSTALLATION
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example, on
curb-mounted units, some accessories must be installed on the
unit before the unit is placed on the curb. Review the following
for recommended sequences for installation steps.
Prepare pad and unit supports
Rig and place unit
Remove duct covers and top skid
Install smoke detector return air sensor tube
Install field-fabricated ductwork at unit duct openings
Install outside air hood
Install combustion air hood
Install flue hood
Install gas piping
Install condensate line trap and piping
Make electrical connections
Install other accessories
CURB-MOUNTED INSTALLATION
Install curb
Install field-fabricated ductwork inside curb
Install accessory thru-base service connection package
(affects curb and unit)
Rig and place unit
Remove top skid
Install outside air hood
Install smoke detector tube
Install combustion air hood
Install flue hood
Install gas piping
10
Table 1 — Operating Weights
UNITS LB (KG)
RGH
Base Unit
181/183
1892 (858)
210/213
2102 (954)
240/243
2247 (1019)
300/303
2292 (1040)
Economizer
246 (112)
246 (112)
246 (112)
246 (112)
Powered Outlet
35 (16)
35 (16)
35 (16)
35 (16)
Hot Gas Re-Heat System
110 (50)
120 (54)
120 (54)
120 (54)
Curb
14-in./356 mm
240 (109)
255 (116)
255 (116)
273 (124)
24-in./610 mm
340 (154)
355 (161)
355 (161)
355 (161)
Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to
the unit. Thru-the-base power connection must be installed before the unit is set on the roof curb. If field-installed thru-theroof curb gas connections are desired remove knockout in
basepan located in the gas section, see Fig. 7 for location. Gas
connections and power connections to the unit must be field installed after the unit is installed on the roof curb.
If electric and control wiring is to be routed through the
basepan, remove knockouts in basepan located in control box
area of access panel; see Fig. 2, 3, or 4 for basepan knockout
locations for location. Attach the service connections to the
basepan.
FRAME-MOUNTED INSTALLATION — Frame-mounted applications generally follow the sequence for a curb installation. Adapt as required to suit specific installation plan.
Step 3 — Inspect Unit — Inspect unit for transportation
damage. File any claim with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data plate
agree with power supply provided.
On units with hinged panel option, check to be sure all
latches are tight and in closed position.
Locate the carton containing the outside air hood parts; see
Fig. 7 and 13. Do not remove carton until unit has been rigged
and located in final position.
Step 4 — Provide Unit Support
Hood Carton Location
(rear access panel)
ROOF CURB MOUNT — Accessory roof curb details and
dimensions are shown in Fig. 8-10. Assemble and install accessory roof curb in accordance with instructions shipped with the
curb.
NOTE: The gasketing of the unit to the roof curb is critical for
a watertight seal. Install gasket supplied with the roof curb as
shown in Fig. 8-10. Improperly applied gasket can also result
in air leaks and poor unit performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in Fig. 6.
Refer to Accessory Roof Curb Installation Instructions for additional information as required.
Control Box
Access Panel
Filter and
Indoor Coil
Access Panel
Indoor Blower
Access Panel
Gas Heat
Access Panel
Compressor
(each side)
Fig. 7 — Typical Access Panel and Compressor
Locations
SLAB MOUNT (HORIZONTAL UNITS ONLY) —
Provide a level concrete slab that extends a minimum of 6 in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of
condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
C
A
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB
OR SLAB MOUNT) — A non-combustible sleeper rail can
be used in the unit curb support area. If sleeper rails cannot be
used, support the long sides of the unit with a minimum of 3
equally spaced 4-in. x 4-in. (102 mm x 102 mm) pads on each
side. Locate pads so that they support the rails. Make sure to
avoid the fork openings.
B
MAXIMUM ALLOWABLE DIFFERENCE IN. (MM)
A-B
B-C
A-C
0.25" (6)
0.5" (12)
0.5" (12)
Fig. 6 — Unit Leveling Tolerances
11
181/183
Fig. 8 — Roof Curb Details — RGH 181 and 183
12
210-243
Fig. 9 — Roof Curb Details — RGH 210-243
13
300, 303
Fig. 10 — Roof Curb Details — RGH 300 and 303
14
Step 5 — Field Fabricate Ductwork —
Cabinet
return-air static pressure (a negative condition) shall not
exceed 0.5 in. wg (87 Pa) with economizer or without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional dimensions are equal to or greater than the unit supply duct opening dimensions for the first 18 in. (458 mm) of duct length
from the unit basepan.
Insulate and weatherproof all external ductwork, joints, and
roof openings with counter flashing and mastic in accordance
with applicable codes.
Ducts passing through unconditioned spaces must be insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with applicable fire codes.
A minimum clearance is not required around ductwork.
Step 6 — Rig and Place Unit — Keep unit upright and
do not drop. Spreader bars are not required if top crating is left
on unit. Rollers may be used to move unit across a roof. Level
by using unit frame as a reference. See Table 1 (on page 11)
and Fig. 11 for additional information.
Lifting holes are provided in base rails as shown in Fig. 11.
Refer to rigging instructions on unit.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck when panels or packaging are removed.
Before setting the unit onto the curb, recheck gasketing on
curb.
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roofing materials.
Membrane roofs can be cut by sharp sheet metal edges. Be
careful when placing any sheet metal parts on such roof.
PLACE ALL SEAL STRIP
IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
(914-1371)
36"-54"
DETAIL A
"B"
SEE DETAIL A
DUCT END
"C"
"A"
UNIT
MAX WEIGHT
lb
2339
2549
2699
2748
kg
1061
1156
1224
1246
A
in.
127.8
141.5
141.5
157.8
mm
3249
3595
3595
4007
DIMENSIONS
B
in.
mm
58.7
1491
71.5
1816
71.5
1816
80.3
2040
C
mm
181/183
1328
210/213
1328
240/243
1532
300/303
1532
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity.
Use wooden top to prevent rigging straps from damaging unit.
Fig. 11 — Rigging Details
15
in.
52.3
52.3
60.3
60.3
Step 8 — Install Outside Air Hood — Factory
Option — The outside air hood for factory-option economiz-
POSITIONING ON CURB — Position unit on roof curb so
that the following clearances are maintained: 1/4 in. (6 mm)
clearance between the roof curb and the base rail inside the
right and left, 1/2 in. (12 mm) clearance between the roof curb
and the base rail inside the front and back. This will result in
the distance between the roof curb and the base rail inside on
the condenser end of the unit being approximately equal to Details A and B in Fig. 8-10.
Do not attempt to slide unit on curb after unit is set. Doing
so will result in damage to the roof curb seal.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Flue vent discharge must have a minimum horizontal clearance of 48 in. (1220 mm) from electric and gas meters, gas regulators, and gas relief equipment. Minimum distance between
unit and other electrically live parts is 48 inches (1220 mm).
Flue gas can deteriorate building materials. Orient unit such
that flue gas will not affect building materials. Locate mechanical draft system flue assembly at least 48 in. (1220 mm) from
an adjacent building or combustible material.
After unit is in position, remove rigging skids and shipping
materials.
er and two-position damper is shipped in knock-down form
and requires field assembly. The panel for the hood top is
shipped on the end of the unit (see Fig. 13). The remaining
parts for the hood assembly (including side panels, filters and
tracks) are shipped in a carton that is secured to the rear of the
blower assembly. Access the carton location through rear panel
(see Fig. 14).
Hood Top
Shipping
Position
Fig. 13 — Hood Top — Shipping Position
Step 7 — Horizontal Duct Connection — Refer to
Fig. 2-4 for locations and sizes of the horizontal duct connections. Note that there are two different return air duct connection locations – one for unit without an economizer (on back
side of unit) and a different one for unit equipped with an economizer (on left end, under the economizer hood). The supply
air duct connection is on the back side. See Fig. 12 for top view
depicting typical horizontal duct arrangements.
Hood
Package
Fig. 14 — Hood Package — Shipping Location
To remove the hood parts package:
1. Remove the back blower access panel.
2. Locate and cut the strap, being careful to not damage any
wiring.
3. Carefully lift the hood package carton through the back
blower access opening.
See Fig. 15 for identification of the various parts of the hood
assembly.
To assemble the outside air hood:
1. Remove hood top panel from shipping position on unit
end.
2. Install four angles to the upper end panel using the screws
provided.
3. Apply seal strip to mating flanges on the side plates of the
hood (see Fig. 15).
Horizontal
Supply Air
Return Air Duct
without
Economizer
Return Air Duct
with Economizer
SUPPLY
RETURN
WITHOUT
ECONOMIZER
RETURN WITH
ECONOMIZER
Back
Back
Left end
Height - in. (mm)
157/8 (402)
493/8 (1253)
183/8 (467)
Width - in. (mm)
293/4 (756)
233/8 (593)
615/8 (1564)
Location
Fig. 12 — Horizontal Duct Opening Dimensions
Field-supplied (3/4 in.) flanges should be attached to horizontal duct openings (see Fig. 12) and all ductwork should be
secured to the flanges. Insulate and weatherproof all external
ductwork, joints, and roof or building openings with counter
flashing and mastic in accordance with applicable codes.
16
Apply Seal Strips
to the back of
these surfaces
Apply Seal Strip
to the front of
this flange
Apply Seal Strips
to the back of
these flanges
re-attach the hood to the front of the burner access panel as
shown in Fig. 17.
3
Apply Seal Strip
to the front of
this flange
7
7
2
2
4
4
5
4
4
6
1
Seal Strips
5
Apply Seal Strip
to the back of
this flange
6
Item #
1
2
3
4
5
6
7
Description
Qty
Angles
4
Side Plates
2
Hood
1
Outdoor Air Screens 4
Side Filter Supports 2
Side Drip Angles
2
Top Diverters
2
Fig. 15 — Hood Part Identification and Seal Strip
Application Areas
4. Secure side plates to panel using the screws provided.
5. Apply seal strip to mating flange of the hood (see
Fig. 15).
6. Secure top flange using screws provided in kit.
7. Install outdoor air screens by sliding them into the channel formed by the four angles installed in Step 2. Make
sure that the screens extend across the entire length of the
hood.
8. Install side filter supports using the screws provided.
9. Install side drip angles using the screws provided.
10. Run a continuous length of seal strip across the hood covering the engagement holes in the lower hood.
11. Install top diverter using the screws provided.
12. On units with barometric relief, remove screws at bottom
of relief damper. Do not discard damper door.
Combustion
Air Hood
Flue Hood
Fig. 17 — Flue Hood and Combustion Air Hood Details
Step 10 — Install Gas Piping — Installation of the gas
piping must be in accordance with local building codes and
with applicable national codes. In U.S.A., refer to NFPA 54/
ANSI Z223.1 National Fuel Gas Code (NFGC). In Canada, installation must be in accordance with the CAN/CSA B149.1
and CAN/CSA B149.2 installation codes for gas burning appliances.
This unit is factory equipped for use with Natural Gas fuel
at elevations up to 2000 ft (610 m) above sea level. Unit may
be field converted for operation at elevations above 2000 ft
(610 m) and/or for use with liquefied petroleum fuel. See accessory kit installation instructions regarding these accessories.
NOTE: Furnace gas input rate on rating plate is for installation
up to 2000 ft (610 m) above sea level. The input rating for altitudes above 2000 ft (610 m) must be derated by 4% for each
1000 ft (305 m) above sea level.
For natural gas applications, gas pressure at unit gas connection must not be less than 5 in. wg (1246 Pa) or greater than
13 in. wg (3240 Pa) while the unit is operating. For liquefied
petroleum applications, the gas pressure must not be less than
11 in. wg (2740 Pa) or greater than 13 in. wg (3240 Pa) at the
unit connection.
GAS SUPPLY LINE — The gas supply pipe enters the unit
adjacent to the burner access panel on the front side of the unit,
through the grommeted hole. The gas connection to the unit is
made to the 3/4-in. FPT gas inlet port on the unit gas valve.
Table 2 lists typical 3/4 inch NPT (National Pipe Thread)
field supplied pipe fittings required for Thru-Base gas supply,
starting from the unit gas valve (see Fig. 18).
Pipe gas supply into 90 degree elbow item 15 (see Table 2)
through the hole in the unit basepan.
For typical 3/4 in. NPT field supplied fittings required for
NON Thru-Base gas supply starting from the unit gas valve,
omit items 14 and 15 from Table 2 and pipe gas supply into
TEE. See Fig. 19.
Fig. 16 — Hood Assembly — Completed
Step 9 — Install Flue Hood and Combustion Air
Hood — The flue hood is shipped screwed to the fan deck in-
side the burner compartment. Remove the burner access panel
and then remove the flue hood from its shipping location. Using the screws provided, install flue hood and screen in location
shown in Fig. 17.
The combustion air hood is attached to the back of the burner access panel. Remove the two screws securing the hood to
the back of the burner access panel. Using the two screws,
17
Table 2 — Typical 3/4-in. NPT Field Supplied Piping
Parts
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
QTY
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
CPN
CA15RA201
CA01CA226
CA85RA201
CA01CA218
CA05RA201
CA01CA250
CA05RA201
CA01CA218
CA20RA201
CA01CN222
CA38RA201
CA01CA220
GB30
CA01CA238
CA05RA201
5
DESCRIPTION
90 Deg Street Elbow
5 in. Long Nipple
Ground-Joint Union
3 in. Long Nipple
90 Deg Elbow
12 in. Long Nipple
90 Deg Elbow
3 in. Long Nipple
TEE
4 in. Long Nipple (Sediment Trap)
Cap
31/2 in. Long Nipple
NIBCO* Ball Valve
8 in. Long Nipple
90 Deg Elbow
UNIT SIZE
RGH
181-303
MIN
5.0 in. wg
(1246 Pa)
12
10
13
11
Fig. 19 — Gas Supply Line Piping
MAX
13.0 in. wg
(3240 Pa)
X
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
GAS
REGULATOR*
MANUAL GAS
SHUTOFF VALVE*
BASE UNIT
6
2
FROM
GAS
METER
48” MINIMUM
DRIP LEG
PER NFGC*
BASE RAIL
FIELDFABRICATED
SUPPORT*
ROOF
CURB
Install a gas supply line that runs to the unit heating section.
Refer to the NFPA 54/NFGC or equivalent code for gas pipe
sizing data. Do not use a pipe smaller than the size specified.
Size the gas supply line to allow for a maximum pressure drop
of 0.5-in. wg (124 Pa) between gas regulator source and unit
gas valve connection when unit is operating at high-fire flow
rate.
The gas supply line can approach the unit in two ways: horizontally from outside the unit (across the roof), or through unit
basepan. Observe clearance to gas line components per Fig. 20.
3
1
8
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to
equipment.
When connecting the gas line to the unit gas valve, the
installer MUST use a backup wrench to prevent damage to
the valve.
4
2
9
CAUTION
5
3
7
Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT MODEL
4
6
LEGEND
NFGC — National Fuel Gas Code
* Field supplied.
NOTE: Follow all local codes.
STEEL PIPE NOMINAL
DIAMETER (in.)
1 /2
3/ or 1
4
11/4 or larger
SPACING OF SUPPORTS X
DIMENSION (ft)
6
8
10
Fig. 20 — Gas Piping Guide
FACTORY OPTION THRU-BASE CONNECTIONS
1
Electrical Connections — Knockouts are located in the control box area. Remove the appropriate size knockout for high
voltage connection. Use the field supplied connector depending on wiring or conduit being utilized. Remove the 7/8-in.
(22mm) knockout and appropriate connector for low voltage
wiring. If non-unit powered convenience outlet is being utilized, remove the 7/8-in. (22mm) knockout and utilize appropriate connector for 115 volt line. See “Step 12 — Make Electrical Connections” for details.
Gas Connections — Remove the knockout in the base pan and
route 3/4-in. gas line up through the opening. Install an elbow
and route gas line through opening in panel after first removing
plastic bushing. Install a gas shut off followed by a drip leg and
ground-joint union. Route gas line into gas section through the
grommet (Part #: KA56SL112) at the gas inlet and into the gas
valve. See Fig. 18 and Table 2. If a regulator is installed, it must
be located 4 ft (1.22 meters) from the flue outlet.
Some municipal codes require that the manual shutoff valve
be located upstream of the sediment trap. See Fig. 19 for typical piping arrangements for gas piping that has been routed
through the sidewall of the base pan.
7
15
8
9
10
11
12
13
14
Fig. 18 — Gas Supply Line Piping with Thru-Base
* NIBCO is a registered trademark of NIBCO Inc.
18
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFPA 54/
ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA
B149.1). In the absence of local building codes, adhere to the
following pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe 1/4inch in every 15 ft (7 mm in every 5 m) to prevent traps.
Grade all horizontal runs downward to risers. Use risers
to connect to heating section and to meter.
2. Protect all segments of piping system against physical
and thermal damage. Support all piping with appropriate
straps, hangers, etc. Use a minimum of one hanger every
6 ft (1.8 m). For pipe sizes larger than 1/2-in., follow recommendations of national codes.
3. Apply joint compound (pipe dope) sparingly and only to
male threads of joint when making pipe connections. Use
only pipe dope that is resistant to action of liquefied petroleum gases as specified by local and/or national codes.
If using PTFE (Teflon*) tape, ensure the material is Double Density type and is labeled for use on gas lines. Apply
tape per manufacturer’s instructions.
4. Pressure-test all gas piping in accordance with local and
national plumbing and gas codes before connecting piping to unit.
NOTE: Pressure test the gas supply system after the gas supply
piping is connected to the gas valve. The supply piping must
be disconnected from the gas valve during the testing of the
piping systems when test pressure is in excess of 0.5 psig
(3450 Pa). Pressure test the gas supply piping system at pressures equal to or less than 0.5 psig (3450 Pa). The unit heating
section must be isolated from the gas piping system by closing
the external main manual shutoff valve and slightly opening
the ground-joint union.
Check for gas leaks at the field-installed and factory-installed gas lines after all piping connections have been completed. Use soap-and-water solution (or method specified by
local codes and/or regulations).
BURNER
ORIFICE
Fig. 21 — Orifice Hole
Step 11 — Install External Condensate Trap and
Line — The unit has one 3/4-in. condensate drain connection
on the end of the condensate pan (see Fig. 22). See Fig. 2-4,
item “E”, in the view labeled “BACK (HORIZONTAL DISCHARGE)” for the location of the condensate drain connection.
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
• Connect gas pipe to unit using a backup wrench to
avoid damaging gas controls.
• Never purge a gas line into a combustion chamber.
• Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for the detection of leaks to check all connections.
• Use proper length of pipe to avoid stress on gas control manifold.
CONDENSATE
DRAIN
CONNECTION
Fig. 22 — Condensate Drain Pan Connection
The piping for the condensate drain and external trap can be
completed after the unit is in place. Hand tighten fittings to the
drain pan fitting. Provide adequate support for the drain line.
Failure to do so can result in damage to the drain pan. See
Fig. 23.
NOTE: If orifice hole appears damaged or it is suspected to
have been re-drilled, check orifice hole with a numbered drill
bit of correct size. Never re-drill an orifice. A burr-free and
squarely aligned orifice hole is essential for proper flame characteristics.
* Teflon is a registered trademark of DuPont.
19
BLK
MINIMUM PITCH
1˝ (25 mm) PER
10´ (3 m) OF LINE
YEL
BASE RAIL
OPEN
VENT
BLU
LOAD
SIDE
3˝(76 mm)
MIN
TO ROOF
DRAIN
SEE NOTE
LINE
SIDE
ROOF
CURB
SEE
DETAIL A
DRAIN PLUG
L1
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4 in. (102 mm) trap is recommended.
L2
L3
Fig. 23 — Condensate Drain Piping Details
All units must have an external trap for condensate drainage. Install a trap at least 4-in. (102 mm) deep and protect
against freeze-up. If drain line is installed downstream from the
external trap, pitch the line away from the unit at 1-in. per 10 ft
(25 mm in 3 m) of run. Do not use a pipe size smaller than the
unit connection (3/4-in.).
DETAIL A
CONTROL BOX
Fig. 24 — Location of TB1
Field power wires are connected to the unit at line-side pressure lugs on the terminal block (see wiring diagram label for
control box component arrangement) or at factory-installed option non-fused disconnect switch. Use copper conductors only.
NOTE: Make field power connections directly to line connection pressure lugs only.
Step 12 — Make Electrical Connections
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit cabinet
must have an uninterrupted, unbroken electrical ground to
minimize the possibility of personal injury if an electrical
fault should occur. This ground may consist of electrical
wire connected to unit ground lug in control compartment,
or conduit approved for electrical ground when installed in
accordance with NEC (National Electrical Code); ANSI/
NFPA 70, latest edition (in Canada, Canadian Electrical
Code CSA [Canadian Standards Association] C22.1), and
local electrical codes.
CAUTION
FIRE HAZARD
Failure to follow this warning could result in intermittent
operation or unsatisfactory performance.
Do not connect aluminum wire between disconnect switch
and air conditioning unit. Use only copper wire. (See
Fig. 25.)
NOTE: Field-supplied wiring shall conform with the limitations of minimum 63°F (3°C) rise.
ELECTRIC
DISCONNECT
SWITCH
FIELD POWER SUPPLY — If equipped with optional
Powered Convenience Outlet: The power source leads to the
convenience outlet’s transformer primary are not factory connected. Installer must connect these leads according to required
operation of the convenience outlet. If an always-energized
convenience outlet operation is desired, connect the source
leads to the line side of the unit-mounted disconnect. (Check
with local codes to ensure this method is acceptable in your area.) If a de-energize via unit disconnect switch operation of the
convenience outlet is desired, connect the source leads to the
load side of the unit disconnect. On a unit without a unitmounted disconnect, connect the source leads to the terminal
block with unit field power leads. See Fig. 24.
COPPER
WIRE ONLY
ALUMINUM
WIRE
Fig. 25 — Disconnect Switch and Unit
UNITS WITHOUT FACTORY-INSTALLED NONFUSED DISCONNECT OR HACR — When installing
units, provide a disconnect switch of adequate size per NEC
(National Electrical Code). Disconnect sizing data is provided
on the unit informative plate. Locate on unit cabinet or within
sight of the unit per national or local codes. Do not cover unit
informative plate if mounting the disconnect on the unit
cabinet.
ALL UNITS — All field wiring must comply with NEC and
all local requirements.
20
Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate. See Fig. 26 for power wiring connections to the unit power terminal blocks and equipment ground.
Maximum wire size is 2/0 AWG per pole.
Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Maximum Over-current Protection) device size.
NOTE: Units ordered with factory installed HACR do not
need an additional ground-fault and short-circuit over-current
protection device unless required by local codes.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within 2%
and the current within 10%. Use the formula below to determine the percent of voltage imbalance.
Units Without Disconnect or HACR Option
TB1
11
L1
L2
L3
208/230-3-60
460-3-60
575-3-60
Ground
(GR)
Units With Disconnect or HACR Option
Example: Supply voltage is 230-3-60.
AB = 224 v
BC = 231 v
AC = 226 v
Factory
Wiring
T1
=
Equip
GR Lug
13
Disconnect
per NEC
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
average voltage
Average Voltage =
12
T2
Equip
GR Lug
T3
Optional
Disconnect
Switch
or HACR
224 + 231 + 226
3
681
3
=
227
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
4
% Voltage Imbalance = 100 x 227
= 1.76%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
L1
L2
L3
L1
L2
L3
Ground
(GR)
Fig. 26 — Power Wiring Connections
CONVENIENCE OUTLETS
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use multiple
disconnects. Check convenience outlet for power status
before opening unit for service. Locate its disconnect
switch, if appropriate, and open it. Lock-out and tag-out
this switch, if necessary.
IMPORTANT: If the supply voltage phase imbalance is more
than 2%, contact your local electric utility company
immediately.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate
any applicable warranty.
Two types of convenience outlets are offered as factory-installed options on RGH models: non-powered and unit-powered. Both types provide a 125-volt GFCI (ground-fault circuitinterrupter) duplex receptacle rated at 15-A behind a hinged
waterproof access cover, located on the panel beneath the control box. See Fig. 27.
A 20 amp non-powered convenience outlet is available as a
field-installed accessory.
21
Non-powered type — This type requires the field installation
of a general-purpose 125-volt 15-A circuit powered from a
source elsewhere in the building. Observe national and local
codes when selecting wire size and conduit requirements, fuse
or breaker requirements and disconnect switch size and location. Route 125-v power supply conductors into the bottom of
the utility box containing the duplex receptacle.
Unit-powered type — A unit-mounted transformer is factoryinstalled to stepdown the main power supply voltage to the unit
to 115-v at the duplex receptacle. This option also includes a
manual switch with fuse, located in a utility box and mounted
on a bracket behind the convenience outlet; access is through
the unit’s control box access panel. See Fig. 27.
The primary leads to the convenience outlet transformer are
not factory-connected. If local codes permit, the transformer
primary leads can be connected at the line-side terminals on the
unit-mounted non-fused disconnect switch; this will provide
service power to the unit when the unit disconnect switch is
open. See Fig. 29.
Control Box
Access Panel
Electric
Disconnect
Switch
Convenience
Outlet
Fig. 27 — Convenience Outlet Location
Installing Weatherproof Cover — A weatherproof while-inuse cover for the factory-installed convenience outlets is now
required by UL standards. This cover cannot be factory-mounted due its depth; it must be installed at unit installation. For
shipment, the convenience outlet is covered with a blank cover
plate.
The weatherproof cover kit is shipped in the unit’s control
box. The kit includes the hinged cover, a backing plate and gasket.
DISCONNECT ALL POWER TO UNIT AND CONVENIENCE OUTLET. LOCK-OUT AND TAG-OUT ALL
POWER.
Remove the blank cover plate at the convenience outlet; discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until approximately 1/2-in. (13 mm) under screw heads are exposed.
Press the gasket over the screw heads. Slip the backing plate
over the screw heads at the keyhole slots and align with the
gasket; tighten the two screws until snug (do not over-tighten).
Mount the weatherproof cover to the backing plate as
shown in Fig. 28. Remove two slot fillers in the bottom of the
cover to permit service tool cords to exit the cover. Check for
full closing and latching.
COVER – WHILE-IN-USE
WEATHERPROOF
RECEPTACLE
NOT SHOWN
UNIT
VOLTAGE
CONNECT
AS
208,230
240
460
480
575
600
PRIMARY
TRANSFORMER
CONNECTIONS
TERMINALS
L1: RED +YEL
H1 + H3
L2: BLU + GRA
H2 + H4
L1: RED
H1
Splice BLU + YEL
H2 + H3
L2: GRA
H4
L1: RED
H1
L2: GRA
H2
Fig. 29 — Powered Convenience Outlet Wiring
BASE PLATE FOR
GFCI RECEPTACLE
Fig. 28 — Weatherproof Cover Installation
22
thermostat cable or equivalent with minimum of six leads. See
Fig. 31. Check the thermostat installation instructions for additional features which might require additional conductors in the
cable.
For wire runs up to 50 ft (15 m), use no. 18 AWG (American Wire Gage) insulated wire (35°C minimum). For 50 to
75 ft (15 to 23 m), use no. 16 AWG insulated wire (35°C minimum). For over 75 ft (23 m), use no. 14 AWG insulated wire
(35°C minimum). All wire sizes larger than no. 18 AWG cannot be directly connected to the thermostat and will require a
junction box and splice at the thermostat.
NOTICE/AVIS
Convenience Outlet Utilization
Maximum Intermittent Use 15 - Amps
Maximum Continuous Use 8 - Amps
Observe a 50% limit on the circuit
Loading above 8 - Amps
Utilisation de la prise utilitaire
Usage intermittent maximum 15 - Amps
Usage continu maximum 8 - Amps
Observez une limite de 50% sur le circuit
Chargement au-dessus de 8 - Amps 50HE501288
2.0
UNIT WITHOUT THRU-BASE CONNECTION
KIT — Correctly rated low voltage wire can be routed
through the rubber grommet located on the corner post adjacent to the control box access panel. Route wire through the
grommet and then route the wire behind the corner post utilizing the factory provided wire ties secured to the control box.
This will ensure separation of the field low voltage wire and
the high voltage circuit. Route the low voltage wire to the central terminal board. See Fig. 32.
Fig. 30 — Convenience Utilization Notice
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle. Check
for proper grounding wires and power line phasing if the GFCI
receptacle does not trip as required. Press the RESET button to
clear the tripped condition.
Using unit-mounted convenience outlets: Units with unitmounted convenience outlet circuits will often require that two
disconnects be opened to de-energize all power to the unit.
Treat all units as electrically energized until the convenience
outlet power is also checked and de-energization is confirmed.
Observe National Electrical Code Article 210, Branch Circuits,
for use of convenience outlets.
Central
Terminal
Board
Typical
Thermostat
Corrections
FACTORY
OPTION
THRU-BASE
CONNECTIONS — All units are equipped with the ability to bring utilities through the base.
Gas is brought up through an embossed area located in the
gas section behind the gas entrance post. Access is gained
through the gas access panel. A knock out must be removed to
accomplish this.
The electrical entrance is located in the control box area and
can be accessed through the control box access panel. An embossed area is provided with three knock outs. High voltage is
brought through the multi knock out by removing the appropriate size for the size of the fitting required. A 7/8-in. knock out is
provided for low voltage. An additional 7/8-in. knock out is provided for a 115 volt line which is used when the unit is
equipped with the non-unit powered convenience outlet option.
All required fittings are field supplied. Install fittings when
access to both top and bottom of the base pan is available. See
electrical and gas connections for routing and connection information.
UNITS WITHOUT THRU-BASE CONNECTIONS
1. Install liquid tight conduit between disconnect and control box.
2. Pull correctly rated high voltage wires through the
conduit.
3. Install power lines to terminal connections as shown in
Fig. 26.
X
X
C
C
G
G
W2
W2
W2
W1
W1
W1
O/B/Y2
Y2
Y2
Y1
Y1
Y1
R
R
R
C
See
Caution
G
(see Note)
T–STAT
NOTE: Typical multi-function marking. Follow manufacturer’s configuration
instructions to select Y2.
Field Wiring
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may cause a short circuit.
Carefully check the connection of control coductor
for indoor fan control at terminal G. Connecting the
indoor fan lead to terminal C will cause a short circuit
condition which can cause component damage inside
the unit or at thermostat.
FIELD CONTROL WIRING — The RGH unit requires
an external temperature control device. This device can be a
thermostat (field-supplied) for Building Management Systems.
THERMOSTAT — Install an approved accessory 2-stage
thermostat according to installation instructions included with
the accessory. Locate the thermostat accessory on a solid wall
in the conditioned space to sense average temperature in accordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v power, use a thermostat cable or equivalent single leads of different
colors with minimum of seven leads. If the thermostat does not
require a 24-v source (no “C” connection required), use a
Fig. 31 — Typical Low-Voltage Control Connections
NOTE: If utilizing the through the base connections, route the
low voltage wire through the wire ties to the central terminal
board.
23
TRANSFORMER
POWER SUPPLY
CONNECTION
FOR
208-V
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is to be
connected to a 208-v power supply, the control transformer
must be rewired by moving the black wire with the 1/4-in. female spade connector from the 230-v connection and moving it
to the 208-v 1/4-in. male terminal on the primary side of the
transformer. Refer to unit label diagram for additional information.
Rubber
Grommet
Corner
Post
Hot Gas Re-Heat Control Connections
HOT GAS RE-HEAT — SPACE RH CONTROLLER
NOTE: Hot Gas Re-Heat system is a factory-installed option.
The Hot Gas Re-Heat dehumidification system requires a
field-supplied and installed space relative humidity control device. This device may be a separate humidistat control (contact
closes on rise in space RH above control setpoint) or a combination thermostat-humidistat control device with isolated contact set for dehumidification control. The humidistat is normally used in applications where a temperature control is already
provided (such as a third-party Building Management System).
To connect a field-supplied humidistat:
1. Route the humidistat 2-conductor cable (field-supplied)
through hole provided in the unit corner post.
2. Feed wires through the raceway built into the corner post
(see Fig. 32) to the 24-v barrier located on the left side of
the control box. The raceway provides the UL-required
clearance between high-voltage and low-voltage wiring.
3. Use wire nuts to connect humidistat cable to two PINK
leads in the low-voltage wiring as shown in Fig. 33.
Wire
Ties
Thru the Base
Connection
Fig. 32 — Field Control Wiring Raceway
HEAT ANTICIPATOR SETTINGS
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second-stage heating.
24
Fig. 33 — Typical Hot Gas Re-Heat Dehumidification System Humidistat Wiring
EconoMi$er®
The W7220 economizer module can be connected to optional sensors for single or differential enthalpy control. The
W7220 economizer module provides power and communications for the sensors.
The W7220 economizer module automatically detects sensors by polling to determine which sensors are present. If a sensor loses communications after it has been detected, the W7220
economizer controller indicates a device fail error on its LCD.
X (Factory-Installed Option)
PRODUCT DESCRIPTION — The EconoMi$er X system is an expandable economizer control system, which includes a W7220 economizer module (controller) with an LCD
and keypad (See Fig. 34). The W7220 can be configured with
optional sensors.
SYSTEM COMPONENTS — The EconoMi$er X system
includes an economizer module, 20k mixed air sensor, damper
actuator, and either a 20k outdoor air temperature sensor or SBus enthalpy sensors.
Economizer Module — The module is the core of the
EconoMi$er X system. The module is mounted in the unit’s
control box, and includes the user interface for the system. The
W7220 economizer module provides the basic inputs and outputs to provide simple economizer control. When used with the
optional sensors, the economizer module provides more advanced economizer functionality.
S-Bus Enthalpy Control Sensors — The sensor is a combination temperature and humidity sensor which is powered by
and communicates on the S-Bus. Up to three sensors may be
configured with the W7220 economizer module.
CO2 Sensor (optional) — The sensor can be added for Demand Controlled Ventilation (DCV).
Fig. 34 — W7220 Economizer Module
The W7220 economizer module can be used as a standalone economizer module wired directly to a commercial
set-back space thermostat and sensors to provide outside air
dry-bulb economizer control.
25
SPECIFICATIONS
ENVIRONMENTAL
W7220 Economizer Module — The module is designed for
use with 2 to 10 Vdc or bus communicating actuator. The module includes terminals for CO2 sensor, Mixed Air sensor, and
an Outdoor Dry Bulb sensor. Enthalpy and other options are
available with bus sensors.
User Interface — Provides status for normal operation, setup
parameters, checkout tests, and alarm and error conditions with
a 2-line 16 character LCD display and four button keypad.
Electrical
Rated Voltage — 20 to 30 Vac RMS, 50/60 Hz
Transformer — 100 va maximum system input
Nominal Power Consumption (at 24 Vac, 60 Hz) — 11.5
VA without sensors or actuators
Relay Digital Output Rating at 30 Vac (maximum power
from Class 2 input only) — 1.5A run:
3.5A inrush at 0.45PF (200,000 cycles) or
7.5A inrush at 0.45PF (100,000 cycles)
External Sensors Power Output — 21 Vdc ± 5% at 48mA
Operating Temperature:
-40 to 150°F (-40 to 65°C).
Exception of display operation down to -4°F with full
recovery at -4°F from exposure to -40°F
Storage Temperature:
-40 to 150°F (-40 to 65°C)
Shipping Temperature:
-40 to 150°F (- 40 to 65°C)
Relative Humidity:
5% to 95% RH non-condensing
ECONOMIZER MODULE WIRING DETAILS — Use
Fig. 35 and Tables 4 and 5 to locate the wiring terminals for the
Economizer module.
NOTE: The four terminal blocks are removable. You can slide
out each terminal block, wire it, and then slide it back into
place.
IMPORTANT: All inputs and outputs must be Class 2
wiring.
NA
MAT
INPUTS
Sensors
NOTE: A Mixed Air (MA) analog sensor is required on all
W7220 units; either an Outdoor Air (OA) sensor for dry bulb
change over or an OA bus sensor for outdoor enthalpy change
over is required in addition to the MA sensor. An additional
Return Air (RA) bus sensor can be added to the system for differential enthalpy or dry bulb changeover. For differential dry
bulb changeover a 20k ohm sensor is required in the OA and a
bus sensor in the RA. DIP switch on RA bus sensor must be
set in the RA position.
MAT
MA
MA
NA
OA
OA
OCC
OAT
OCC
A2
OAT
S-BUS
SB
SB
S-BUS
V
C
R
IAQCOM
EXH1
EX
AUX1-O
Cert
Product
California Title 24,Part 6
HJW10
SB
SB
IAQ 2-10
E-GND
A1
SB
SB
Dry Bulb Temperature (optional) and Mixed Air (required),
20k NTC
2-wire (18 to 22 AWG);
Temperature range -40 to 150°F (-40 to 65°C)
Temperature accuracy -0°F/+2°F
AUX2-
www.energy.ca.gov
Y2I
Y2-
Y2O
Y2-O
Y1I
IAQ 24V
Temperature and Humidity, C7400S1000 (optional)
S-Bus; 2-wire (18 to 22 AWG)
Temperature: range -40 to 150°F (-40 to 65°C)
Temperature accuracy -0°F/+2°F
Humidity: range 0 to 100% RH with 5% accuracy.
NOTE: Up to three (3) S-Bus sensors may be connected to the
W7220 economizer module. For outdoor air (OA), return air
(RA) and discharge (supply) air (DA).
V
C
R
NA
ACT 2-10
ACT COM
Y1-
Y1O
C
Y1-O
R
C
ACT 24V
R
50040839-001
Rev. G
50048848-002
Rev. A
4 Binary Inputs — 1-wire 24 Vac + common GND.
24 Vac power supply — 20 to 30 Vac 50/60Hz; 100 VA Class
2 transformer.
Fig. 35 — W7220 Wiring Terminals
OUTPUTS
Actuator Signal: 2-10 Vdc; minimum actuator impedance is
2k ohm; bus two-wire output for bus communicating actuators.
Exhaust fan, Y1, Y2 and AUX1 O:
All Relay Outputs (at 30 Vac):
Running: 1.5A maximum
Inrush: 7.5A maximum
26
Use Fig. 36 and Table 6 to locate the wiring terminals for
each enthalpy control sensor.
Table 4 — Economizer Module - Left Hand Terminal
Blocks
LABEL
TYPE
DESCRIPTION
Top Left Terminal Block
MAT
MAT
20k NTC
and COM
Mixed Air Temperature Sensor (Polarity
Insensitive Connection)
OAT
OAT
20k NTC
and COM
Outdoor Air Temperature Sensor
(Polarity Insensitive Connection)
S-BUS
S-BUS
S-BUS
(Sylk* Bus)
Enthalpy Control Sensor
(Polarity Insensitive Connection)
Bottom Left Terminal Block
IAQ 2-10
2-10 vdc
DIP
Switch
Label
Air Quality Sensor Input (e.g. CO2
sensor)
IAQ COM
COM
Air Quality Sensor Common
IAQ 24V
24 vac
Air Quality Sensor 24 vac Source
ACT 2-10
2-10 vdc
Damper Actuator Output (2-10 vdc)
ACT COM
COM
Damper Actuator Output Common
ACT 24v
24 vac
Damper Actuator 24 vac Source
DIP
Switches
(3)
Table 5 — Economizer Module - Right Hand Terminal
Blocks
LABEL
TYPE
DESCRIPTION
S-Bus
Terminals
(1 and 2)
Top Right Terminal Blocks
AUX2 I
24 vac IN
The first terminal is not used.
OCC
24 vac IN
Shut Down (SD) or HEAT (W)
Conventional only
and
Heat Pump Changeover (O-B) in Heat
Pump mode.
E-GND
E-GND
Occupied/Unoccupied Input
EXH1
24 vac
OUT
Exhaust Fan 1 Output
AUX1 O
24 vac
OUT
S-Bus
2 Pin Side
Connector
Fig. 36 — S-Bus Sensor DIP Switches
Table 6 — HH57AC081 Sensor Wiring Terminations
TERMINAL
DESCRIPTION
S-BUS
S-BUS
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
S-BUS
S-BUS
S-BUS
Communications
(Enthalpy Control
Sensor Bus)
LABEL
1
2
Programmable:
Exhaust fan 2 output
or
ERV
or
System alarm output
Bottom Right Terminal Blocks
TYPE
NUMBER
Y2-I
24 vac IN
Y2 in - Cooling Stage 2 Input from
space thermostat
Use Fig. 36 and Table 7 to set the DIP switches for the
desired use of the sensor.
Y2-O
24 vac
OUT
Y2 out - Cooling Stage 2 Output to
stage 2 mechanical cooling
Table 7 — HH57AC081 Sensor DIP Switch
Y1-I
24 vac IN
Y1 in - Cooling Stage 2 Input from
space thermostat
USE
Y1-O
24 vac
OUT
Y1 out - Cooling Stage 2 Output to
stage 2 mechanical cooling
DA
RA
ON
OFF
OFF
C
COM
24 vac Common
OA
OFF
OFF
OFF
R
24 vac
24 vac Power (hot)
DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3
1
2
3
OFF
ON
OFF
NOTE: When a S-Bus sensor is connected to an existing network, it will take 60 minutes for the network to recognize and
auto-configure itself to use the new sensor.
During the 60 minute setup period, no alarms for sensor
failures (except SAT) will be issued and no economizing function will be available.
S-BUS SENSOR WIRING — The labels on the sensors and
controller are color coded for ease of installation. Orange labeled sensors can only be wired to orange terminals on the controller. Brown labeled sensors can only be wired to S-bus
(brown) terminals. Use Fig. 36 and Table 6 to locate the wiring
terminals for each S-Bus sensor.
CO2 SENSOR WIRING — When using a CO2 sensor the
black and brown common wires are internally connected and
only one is connected to “IAQ COM” on the W7220. Use the
power from the W7220 to power the CO2 sensor OR make sure
the ground for the power supplies are common. See Fig. 37 for
CO2 sensor wiring.
* Sylk is a trademark of Honeywell International Inc.
27
5. Press the ▲ button to increase (change) the displayed parameter value.
6. Press the ▼ button to decrease (change) the displayed parameter value.
NOTE: When values are displayed, pressing and holding the
or button causes the display to automatically increment.
7. Press the
(Enter) button to accept the displayed value
and store it in nonvolatile RAM.
8. “CHANGE STORED” displays.
9. Press the
(Enter) button to return to the current menu
parameter.
10. Press the
(Menu Up/Exit) button to return to the previous menu.
CO2 SENSOR
RED
24V
ANALOG
OUT
BLACK
+
–
YELLOW
L1
(HOT)
L2
1
BROWN
ORANGE
GREEN
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
MENU STRUCTURE — Table 8 illustrates the complete hierarchy of menus and parameters for the EconoMi$er® X system.
The Menus in display order are:
• STATUS
• SETPOINTS
• SYSTEM SETUP
• ADVANCED SETUP
• CHECKOUT
• ALARMS
Fig. 37 — CO2 Sensor Wiring
INTERFACE OVERVIEW — This section describes how
to use the Economizer’s user interface for:
• Keypad and menu navigation
• Settings and parameter changes
• Menu structure and selection
USER INTERFACE — The user interface consists of a 2line LCD display and a 4-button keypad on the front of the
economizer controller.
IMPORTANT: Table 8 illustrates the complete hierarchy. Your menu parameters may be different depending
on your configuration.
For example if you do not have a DCV (CO2) sensor,
then none of the DCV parameters appear and only MIN
POS will display. If you have a CO2 sensor, the DCV MIN
and DCV MAX will appear AND if you have 2 speed fan
DCV MIN (high and low speed) and DCV MAX (high
and low speed will appear).
KEYPAD — The four navigation buttons (see Fig. 38) are
used to scroll through the menus and menu items, select menu
items, and to change parameter and configuration settings.
To use the keypad when working with menus:
• Press the ▲ (Up arrow) button to move to the previous
menu.
• Press the ▼ (Down arrow) button to move to the next
menu.
• Press the
(Enter) button to display the first item in
the currently displayed menu.
NOTE: Some parameters in the menus use the letters MA or
MAT, indicating a mixed air temperature sensor location
before the cooling coil. This unit application has the control
sensor located after the cooling coil, in the fan section, where it
is designated as (Cooling) Supply Air Temperature or SAT
sensor.
SETUP AND CONFIGURATION — Before being placed
into service, the W7220 Economizer module must be setup and
configured for the installed system.
IMPORTANT: During setup, the economizer module is
live at all times.
The setup process uses a hierarchical menu structure that is
easy to use. Press the ▲ and ▼ arrow buttons to move forward
and backward through the menus and press the button to select
and confirm setup item changes.
TIME-OUT AND SCREENSAVER — When no buttons
have been pressed for 10 minutes, the LCD displays a screen
saver, which cycles through the Status items. Each Status items
displays in turn and cycles to the next item after 5 seconds.
Fig. 38 — W7220 Controller Navigation Buttons
Press the
(Menu Up/Exit) button to exit a menu’s
item and return to the list of menus. To use the keypad when
working with Setpoints, System and Advanced Settings,
Checkout tests and Alarms:
1. Navigate to the desired menu.
2. Press the
(Enter) button to display the first item in the
currently displayed menu.
3. Use the ▲ and ▼ buttons to scroll to the desired parameter.
4. Press the
(Enter) button to display the value of the
currently displayed item.
28
Table 8 — Menu Structure
MENU
PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT
ECONO AVAIL
NO
YES/NO
FIRST STAGE COOLING DEMAND (Y1–IN)
YES = economizing available; the system can use outside air for free
cooling when required
ECONOMIZING
NO
YES/NO
FIRST STAGE COOLING RELAY OUTPUT
YES = outside air being used for 1 stage cooling
OCCUPIED
YES = OCC signal received from space thermostat or
unitary controller
YES = 24 Vac on terminal OCC
NO = 0 Vac on terminal OCC
NOTES
OCCUPIED
NO
YES/NO
HEAT PUMP
N/A
COOL
HEAT
COOL Y1—IN
OFF
ON/OFF
FIRST STAGE COOLING DEMAND (Y1-IN)
Y1–I signal from space thermostat or unitary controller for cooling stage
1.
ON = 24 Vac on terminal Y1–I
OFF = 0 Vac on terminal Y1–I
COOL Y1—OUT
OFF
ON/OFF
FIRST STAGE COOLING RELAY OUTPUT
Cool stage 1 Relay Output to stage 1 mechanical cooling
(Y1–OUT terminal)
HEAT PUMP MODE
Displays COOL or HEAT when system is set to heat pump
(Non-conventional)
COOL Y2—IN
OFF
ON/OFF
SECOND STAGE COOLING DEMAND (Y2–IN)
Y2–I signal from space thermostat or unitary controller for second stage
cooling.
ON = 24 Vac on terminal Y2–I
OFF = 0 Vac on terminal Y2–I
COOL Y2—OUT
OFF
ON/OFF
SECOND STAGE COOLING RELAY OUTPUT
Cool Stage 2 Relay Output to mechanical cooling
(Y2–OUT terminal)
MA TEMP
__._F
0 to 140 F
SUPPLY AIR TEMPERATURE, Cooling Mode
Displays value of measured mixed air from MAT sensor.
Displays _ _ . _ F if not connected, short or out-of-range.
DISCHARGE AIR TEMPERATURE, after Heating section
Displays when Discharge Air sensor is connected and displays measured discharge temperature.
Displays _ _ . _F if sensor sends invalid value, if not connected, short or
out-of-range.
STATUS
DA TEMP
__._F
0 to 140 F
OA TEMP
__._F
-40 to 140 F
OUTSIDE AIR TEMP
Displays measured value of outdoor air temperature.
Displays _ _ . _F if sensor sends invalid value, short or
out-of-range.
OA HUM
__%
0 to 100%
OUTSIDE AIR RELATIVE HUMIDITY
Displays measured value of outdoor humidity from
OA sensor.
Displays _ _% if not connected short, or out-of-range.
RA TEMP
__._F
0 to 140 F
RETURN AIR TEMPERATURE
Displays measured value of return air temperature from
RAT sensor.
Displays _ _ . _ F if sensor sends invalid value, if not connected, short or
out-of-range
RA HUM
__%
0 to 100%
RETURN AIR RELATIVE HUMIDITY
Displays measured value of return air humidity from
RA sensor.
Displays _ _% if sensor sends invalid value, if not connected, short or
out-of-range
IN CO2
_ _ _ ppm
0 TO 2000 ppm
SPACE/RETURN AIR CO2
Displays value of measured CO2 from CO2 sensor. Invalid if not connected, short or out-of-range
DCV STATUS
N/A
ON/OFF
DAMPER OUT
2.0v
2.0 TO 10.0v
ACT POS
N/A
0 to 100%
DEMAND CONTROLLED VENTILATION STATUS
Displays ON if above setpoint and OFF if below setpoint, and ONLY if a
CO2 sensor is connected.
Displays voltage output to the damper actuator.*
Displays actual position of outdoor air damper actuator
* When used with communicating actuator the damper out is reported in XX.X% open versus XX.X Vdc.
29
Table 8 — Menu Structure (cont)
MENU
PARAMETER
DEFAULT
VALUE
PARAMETER
PARAMETER
RANGE AND
INCREMENT
NOTES
ACT COUNT
N/A
1 to 65535
Displays number of times actuator has cycled.
1 cycle equals 180 deg. of actuator movement in any direction.
ACTUATOR
N/A
OK/Alarm (on Alarm
menu)
Displays ERROR if voltage or torque is below actuator range.
EXH1 OUT
OFF
ON/OFF
EXHAUST STAGE 1 RELAY OUTPUT
Output of EXH1 terminal:
ON = relay closed
OFF = relay open
EXH2 OUT
OFF
ON/OFF
EXHAUST STAGE 2 RELAY OUTPUT
Output of AUX terminal; displays only if AUX = EXH2
ERV
OFF
ON/OFF
ENERGY RECOVERY VENTILATOR
Output of AUX terminal; displays only if AUX = ERV
MECH COOL ON
or
HEAT STAGES ON
0
0, 1, or 2
Displays stage of mechanical cooling that is active.
FAN SPEED
N/A
LOW or HIGH
SUPPLY FAN SPEED
Displays speed setting of fan on a 2-speed fan unit.
W (HEAT ON)
N/A
ON/OFF
HEAT DEMAND STATUS
Displays status of heat demand on a 2-speed fan unit.
MAT SET
53F
38 to 65 F; increment
by 1
SUPPLY AIR SETPOINT
Setpoint determines where the economizer will modulate the OA
damper to maintain the mixed air temperature.
LOW T LOCK
32F
-45 to 80 F;
increment by 1
COMPRESSOR LOW TEMPERATURE LOCKOUT
Setpoint determines outdoor temperature when the mechanical cooling
cannot be turned on. Commonly referred to as the Compressor lockout.
DRYBLB SET
63F
48 to 80 F; increment
by 1
OA DRY BULB TEMPERATURE CHANGEOVER SETPOINT
Setpoint determines where the economizer will assume outdoor air temperature is good for free cooling; e.g.; at 63 F unit will economize at 62 F
and below and not economize at 64 F and above. There is a 2 F deadband.
ENTH CURVE
ES3
ES1,ES2,ES3,ES4,
or ES5
ENTHALPY CHANGEOVER CURVE
Enthalpy boundary “curves” for economizing using single enthalpy.
DCV SET
1100ppm
500 to 2000ppm;
increment by 100
DEMAND CONTROLLED VENTILATION
Displays only if CO2 sensor is connected. Setpoint for Demand Controlled Ventilation of space. Above the setpoint, the OA dampers will
modulate open to bring in additional OA to maintain a space ppm level
below the setpoint.
MIN POS
2.8 V
2 to 10 Vdc
VENTILATION MINIMUM POSITION
Displays ONLY if a CO2 sensor is NOT connected.
VENTMAX
With 2-speed fan units
VENTMAX L (low speed fan)
and VENTMAX H (high
speed fan) settings are
required
2.8 V
2 to 10 Vdc
DCV MAXIMUM DAMPER POSITION
Displays only if a CO2 sensor is connected. Used for Vbz (ventilation
max cfm) setpoint. Displays 2 to 10 V if <3 sensors (RA,OA, and MA). In
AUTO mode dampers controlled by CFM.
100 to 9990 cfm;
increment
by 10
If OA, MA, RA, and CO2 sensors are connected and DCV CAL ENABLE
is set to AUTO mode, the OA dampers are controlled by CFM and displays from 100 to 9990 CFM.
2 to 10 Vdc
With 2-speed fan units VENT L (low speed fan) and MIN POS H (high
speed fan) settings are required. Default for VENTMAX L is 3.2V and
VENTMAX H is 2.8V
2 to 10 Vdc or 100 to
9990 cfm increment
by 10
DCV MINIMUM DAMPER POSITION
Displays only if a CO2 sensor is connected. Used for Ba (ventilation min
cfm) setpoint. Displays 2 to 10 V if <3 sensors (RA, OA, and MA). Va is
only set if DCV is used. This is the ventilation for less than maximum
occupancy of the space. In AUTO mode dampers controlled by CFM.
100 to 9990 cfm;
increment
by 10
If OA, MA, RA, and CO2 sensors are connected and DCV CAL ENABLE
is set to AUTO mode, the OA dampers are controlled by CFM and displays from 100 to 9990 CFM.
2 to 10 Vdc
With 2-speed fan units VENTMIN L (low speed fan) and MIN POS H
(high speed fan) settings are required. Default for VENTMIN L is 3.2V
and VENTMIN H is 2.8V
32°F
0 to 50 F; increment
by 1
ENERGY RECOVERY VENTILATOR UNIT OUTDOOR AIR TEMPERATURE SETPOINT
Only when AUX1 O = ERV
50%
0 to 100%;increment
by 1
EXHAUST FAN STAGE 1 SETPOINT
Setpoint for OA damper position when exhaust fan 1 is powered by the
economizer.
With 2-speed fan units Exh1 L (low speed fan) and Exh1 H (high speed
fan) settings are required. Default for Exh1 L is 65% and Exh1 H is 50%
75%
0 to 100%; increment
by 1
EXHAUST FAN STAGE 2 SETPOINT
Setpoint for OA damper position when exhaust fan 2 is powered by the
economizer. Only used when AUX1 O is set to EHX2.
With 2-speed fan units Exh2 L (low speed fan) and Exh2 H (high speed
fan) settings are required. Default for Exh2 L is 80% and Exh2 H is 75%
STATUS (CONT)
Displays the stage of heat pump heating that is active.
SETPOINTS
VENTMIN
With 2-speed
fan units VENTMIN L (low
speed fan) and VENTMIN
H (high speed fan) set
ERV OAT SP
EXH1 SET
With 2-speed fan units Exh1
L (low speed fan) and Exh1
H (high speed fan) settings
are required
EXH2 SET
With 2-speed fan units Exh2
L (low speed fan) and Exh2
H (high speed fan) settings
are required
2.25 V
30
Table 8 — Menu Structure (cont)
MENU
PARAMETER
DEFAULT
VALUE
PARAMETER
INSTALL
01/01/10
PARAMETER
RANGE AND
INCREMENT
N/A
Display order = MM/DD/YY
Setting order = DD, MM, then YY.
UNITS DEG
F
F or C
Sets economizer controller in degrees Fahrenheit or Celsius
EQUIPMENT
CONV
Conventional or HP
CONV = conventional;
HP O/B = Enable Heat Pump mode. Use AUX2 I for Heat Pump input
from thermostat or controller.
See Menu Note 7.
AUX2 IN
W
SD/W or HP(O)/
HP(B)
In CONV mode:
SD + Enables configuration of shutdown (default);
W = Informs controller that system is in heating mode.
NOTE: If using 2-speed fan mode, you must program CONV mode for
W. Shutdown is not available in 2-speed fan mode. See Menu Note 7.
In HP O/B mode:
HP(O) = energize heat pump on Cool (default);
HP(B) = energize heat pump on heat.
FAN SPEED
2 speed
1 speed/2 speed
Sets the economizer controller for operation of 1 speed or 2 speed supply fan.
NOTE: 2-speed fan option also needs Heat (W1) programmed in AUX 2
In. See Menu Note 7.
FAN CFM
5000cfm
100 to 15000 cfm;
increment by 100
UNIT DESIGN AIRFLOW (CFM)
Enter only if using DCVAL ENA = AUTO
The value is dounf on the nameplate label for the specific unit.
AUX1 OUT
NONE
NONE
ERV
EXH2
SYS
Select OUTPUT for AUX1 O relay
• NONE = not configured (output is not used)
• ERV = Energy Recovery Ventilator
• EXH2 = second damper position relay closure for second exhaust fan
• SYS = use output as an alarm signal
OCC
INPUT
INPUT or ALWAYS
OCCUPIED MODE BY EXTERNAL SIGNAL
When using a setback thermostat with occupancy out (24 vac), the 24
vac is input “INPUT” to the OCC terminal. If no occupancy output from
the thermostat then change program to “ALWAYS” OR add a jumper
from terminal R to OCC terminal.
FACTORY DEFAULT
NO
NO or YES
Resets all set points to factory defaults when set to YES. LCD will briefly
flash YES and change to NO but all parameters will change to the factory default values.
NOTE: RECHECK AUX2 IN and FANTYPE for required 2-speed values.
MA LO SET
45°F
35 to 55 F;
Incremented by 10
SUPPLY AIR TEMPERATURE LOW LIMIT
Temperature to achieve Freeze Protection (close damper and alarm if
temperature falls below setup value).
FREEZE POS
CLO
CLO or MIN
FREEZE PROTECTION DAMPER POSITION
Damper position when freeze protection is active (closed or MIN POS).
CO2 ZERO
0ppm
0 to 500 ppm;
Increment by 10
CO2 ppm level to match CO2 sensor start level.
CO2 SPAN
2000ppm
1000 to 3000 ppm;
Increment by 10
CO2 ppm span to match CO2 sensor.
STG3 DLY
2.0h
0 min, 5 min, 15 min,
then 15 min intervals.
Up to 4 hrs or OFF
COOLING STAGE 3 DELAY
Delay after stage 2 cool has been active. Turns on 2nd stage of cooling
when economizer is 1st stage and mechanical cooling is 2nd stage.
Allows three stages of cooling, 1 economizer and 2 mechanical.
OFF = no Stage 3 cooling
SD DMPR POS
CLO
CLO or OPN
Indicates shutdown signal from space thermostat or unitary controller.
When controller receives 24 Vac input on the SD terminal in conventional mode, the OA damper will open if programmed for OPN and OA
damper will close if programmed for CLO. All other controls, e.g., fans,
etc. will shut off.
DA LO ALM
45 F (7 C)
35 to 65 F; (2 to
18 C) Incremented
by 5 deg.
Used for alarm for when the DA air temperature is too low. Set lower
range of alarm, below this temperature the alarm will show on the display.
DA HI ALM
80 F (27 C)
70 to 180 F; (21 to
82 C) Incremented
by 5 deg.
Used for alarm for when the DA air temperature is too high. Set upper
range of alarm, above this temperature the alarm will show on the display.
DCVCAL ENA
MAN
MAN (manual) AUTO Turns on the DCV automatic control of the dampers. Resets ventilation
based on the RA, OA, and MA sensor conditions. Requires all 3 RA, OA,
and MA sensors.
SYSTEM SETUP
ADVANCED
SETUP
NOTES
31
Table 8 — Menu Structure (cont)
MENU
ADVANCED
SETUP (CONT)
CHECKOUT†
PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT
NOTES
MAT T CAL
0.0°F
±2.5 F
SUPPLY AIR TEMPERATURE CALIBRATION
Allows for the operator to adjust for an out of calibration temperature
sensor.
OAS T CAL
0.0°F
±2.5 F
OUTSIDE AIR TEMPERATURE CALIBRATION
Allows for the operator to adjust for an out of calibration temperature
sensor.
OA H CAL
0% RH
±10% RH
OUTSIDE AIR HUMIDITY CALIBRATION
Allows for operator to adjust for an out of calibration humidity sensor.
RA T CAL
0.0°F
±2.5 F
RETURN AIR TEMPERATURE CALIBRATION
Allows for the operator to adjust for an out of calibration temperature
sensor.
RA H CAL
0% RH
±10% RH
RETURN AIR HUMIDITY CALIBRATION
Allows for operator to adjust for an out of calibration humidity sensor.
DA T CAL
0.0°F
±2.5 F
DISCHARGE AIR TEMPERATURE CALIBRATION
Allows for the operator to adjust for an out of calibration temperature
sensor.
2SP FAN DELAY
5 Minutes
0 to 20 minutes in 1
minute increments
TIME DELAY ON 2nd STAGE ECONOMIZING
When in economizing mode this is the delay for the high speed fan to try
to satisfy the call for second stage cooling before the first stage mechanical cooling is enabled.
DAMPER MINIMUM POSITION
N/A
N/A
The checkout for the damper minimum position is based on the system.
See Table 9.
DAMPER OPEN
N/A
N/A
Position damper to the full open position.
Exhaust fan contacts enable during the DAMPER OPEN test. Make
sure you pause in the mode to allow exhaust
contacts to energize due to the delay in the system.
Positions damper to the fully closed position
DAMPER CLOSE
N/A
N/A
CONNECT Y1–O
N/A
N/A
Closes the Y1-O relay (Y1-O)
CONNECT Y2–O
N/A
N/A
Closes the Y2-O relay (Y2-O)
CONNECT AUX1-O
N/A
N/A
Energizes the AUX output. If Aux setting is:
• NONE — not action taken
• ERV — 24 Vac out. Turns on or signals an ERV that the conditions are
not good for economizing but are for ERV operation.
• SYS — 24 Vac out. Issues a system alarm
CONNECT EXH1
N/A
N/A
Closes the power exhaust fan 2 relay (EXH1)
Alarms display only when they are active. The menu title “ALARMS(#)” includes the number of active alarms in parenthesis ( ). When using SYLK
bus sensors, “SYLK” will appear on the screen, and when using 20k OA temperature sensors, “SENS T” will appear on the screen
ALARMS
MA T SENS ERR
N/A
N/A
SUPPLY AIR TEMPERATURE SENSOR ERROR
Mixed air sensor has failed or become disconnected - check wiring then
replace sensor if the alarm continues.
CO2 SENS ERR
N/A
N/A
CO2 SENSOR ERROR
CO2 sensor has failed, gone out of range or become disconnected check wiring then replace sensor if the alarm continues.
OUTSIDE AIR S-BUS SENSOR ERROR
Outdoor air enthalpy sensor has failed or become disconnected - check
wiring then replace sensor if the alarm continues.
OA SYLK T ERR
N/A
N/A
OA SYLK H ERR
N/A
N/A
RA SYLK T ERR
N/A
N/A
RA SYLK H ERR
N/A
N/A
DA SYLK T ERR
N/A
N/A
DISCHARGE AIR S-BUS SENSOR ERROR
Discharge air sensor has failed or become disconnected - check wiring
then replace sensor if the alarm continues.
OA SENS T ERR
N/A
N/A
OUTSIDE AIR TEMPERATURE SENSOR ERROR
Outdoor air temperature sensor has failed or become disconnected check wiring then replace if the alarm continues.
ACT ERROR
N/A
N/A
ACTUATOR ERROR
Actuator has failed or become disconnected - check for stall, over voltage, under voltage and actuator count. Replace actuator if damper is
movable and supply voltage is between 21.6 V and 26.4 V. Check actuator count on STATUS menu.
FREEZE ALARM
N/A
N/A
Check if outdoor temperature is below the LOW Temp Lockout on setpoint menu. Check if Mixed air temperature on STATUS menu is below
the Lo Setpoint on Advanced menu. When conditions are back in normal
range then the alarm will go away.
RETURN AIR S-BUS SENSOR ERROR
Return air enthalpy sensor has failed or become disconnected - check
wiring then replace sensor if the alarm continues.
† After 10 minutes without a command or mode change, the controller will change to normal operation.
32
Table 8 —Menu Structure (cont)
MENU
PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER
RANGE AND
INCREMENT
SHUTDOWN ACTIVE
N/A
N/A
AUX2 IN is programmed for SHUTDOWN and 24 V has been applied to
AUX2 IN terminal.
DMP CAL RUNNING
N/A
N/A
DAMPER CALIBRATION ROUTINE RUNNING
If DCV Auto enable has been programmed, when the W7220 is completing a calibration on the dampers, this alarm will display. Wait until the
calibration is completed and the alarm will go away. Must have OA, MA
and RA sensors for DCV calibration; set up in the Advanced setup
menu.
DA SENS ALM
N/A
N/A
DISCHARGE AIR TEMPERATURE SENSOR ALARM
Discharge air temperature is out of the range set in the ADVANCED
SETUP Menu. Check the temperature of the discharge air.
SYS ALARM
N/A
N/A
When AUX1-0 is set to SYS and there is any alarm (e.g., failed sensors,
etc.), the AUX1-0 terminal has 24 Vac out.
ACT UNDER V
N/A
N/A
ACTUATOR VOLTAGE LOW
Voltage received by actuator is above expected range.
ACT OVER V
N/A
N/A
ACTUATOR VOLTAGE HIGH
Voltage received by actuator is below expected range.
ACT STALLED
N/A
N/A
ACTUATOR STALLED
Actuator stopped before achieving commanded position.
ALARMS
(CONT)
CLO
ERV
LCD
MA
MAT
N/A
OA
OAT
OCC
RA
RAT
RTU
SYS
NOTES
4. STATUS —> OCCUPIED — The factory-standard Occupancy
signal originates with a thermostat or other controller call for
indoor fan operation at CTB terminal G. This signal passes
through the Central Terminal Board’s OCCUPIED jumper JMP1
to the ECONO connector and to the W7220’s OCC input terminal. An external timeclock or relay is required to implement an
Occupancy schedule on the economizer damper position.
5. STATUS —> MA TEMP, SETPOINTS —> MAT SET — The
W7220 menu parameters and labels include designations MA,
MAT and Mixed Air for the economizer cooling control sensor.
On these rooftop units, the economizer control sensor is
located downstream of the evaporator/indoor coil in the supply
fan section where this sensor is designated as Supply Air Temperature (SAT) sensor.
6. SETPOINTS —> DRYBLB SET — This point is not displayed if
a Return Air (differential) temperature sensor or an Outdoor Air
enthalpy sensor is connected.
7. SYSTEM SETUP parameters must be configured as noted for
2-Speed unit operation:
EQUIPMENT = CONV
AUX2 IN = W
FAN SPEED = 2SPEED
LEGEND
— Compressor Lockout
— Energy Recovery Ventilator
— Liquid Crystal Display
— Mixed Air
— Mixed Air Temperature
— Not Applicable
— Outdoor Air
— Outdoor Air Temperature
— Occupied
— Return Air
— Return Air Temperature
— Rooftop Unit
— System
NOTES:
1. Table 8 illustrates the complete hierarchy. Your menu parameters may be different depending on your configuration. For
example if you do not have a DCV (CO2) sensor, then none of
the DCV parameters appear.
2. When values are displayed, pressing and holding the
or
button causes the display to automatically increment.
3. ERV Operation: When in cooling mode AND the conditions are
NOT OK for economizing - the ERV terminal will be energized.
In the Heating mode, the ERV terminal will be energized when
the OA is below the ERV OAT setpoint in the setpoint menu.
For damper minimum position settings and checkout menu
readings, see Table 9. For dry bulb operation with a 1 speed indoor fan, with or without DCV, see Tables 10 and 11. For enthalpy operation with a 1 speed indoor fan, with or without
DCV, see Tables 12 and 13. For dry bulb operation with a 2
speed indoor fan, with or without DCV, see Tables 14 and 15.
For enthalpy operation with a 2 speed indoor fan, with or without DCV, see Tables 16 and 17.
33
Table 9 — Damper Minimum Position Settings and Readings on Checkout Menu
DEMAND CONTROLLED
VENTILATION
(CO2 SENSOR)
FAN SPEED
1
NO
2
1
YES
2
SETPOINTS
CHECKOUT
MIN POS
N/A
MIN POS H
MIN POS L
VENT MIN
VENT MAX
VENT MIN H
VENT MAX H
VENT MIN L
VENT MAX L
VMAX–HS
N/A
VMAX–HS
VMAX–LS
VMAX–HS
VMAX–HS
VMAX–HS
VMAX–LS
N/A
N/A
Table 10 — Dry Bulb Operation No DCV (CO2 Sensor) — 1 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
NONE
NO
NONE
YES
Y1-I
Y2-I
FAN
SPEED
OFF
OFF
HIGH
0v/Off
ON
OFF
HIGH
24v/On
ON
ON
HIGH
24v/On
24v/On
OFF
OFF
HIGH
0v/Off
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
0v/Off
MIN POS
Closed
0v/Off
MIN POS
Closed
MIN POS
Closed
0v/Off
MIN POS
Closed
Closed to Full-Open
Closed to Full-Open
ON
OFF
HIGH
0v/Off
0v/Off
MIN POS to Full
Open
ON
ON
HIGH
24v/On
0v/Off*
MIN POS to Full
Open
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for
Y1-I and Y2-I have not been satisfied.
Table 11 — Dry Bulb Operation With DCV (CO2 Sensor) — 1 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
No
Below CO2 Set
Yes
No
Y1-I
Y2-I
FAN
SPEED
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN
Closed
ON
OFF
HIGH
24v/On
0v/Off
VENTMIN
Closed
Y1-O
Y2-O
UNOCCUPIED
ON
ON
HIGH
24v/On
24v/On
VENTMIN
Closed
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN
Closed
ON
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
HIGH
24v/On
0v/Off
VENTMIN to
VENTMAX
Closed
ON
ON
HIGH
24v/On
24v/On
VENTMIN to
VENTMAX
Closed
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off*
VENTMIN to
Full-Open
Closed to Full-Open
Above CO2 Set
Yes
OCCUPIED
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for
Y1-I and Y2-I have not been satisfied.
34
Table 12 — Enthalpy Operation No DCV (CO2 Sensor) — 1 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
NONE
NO
NONE
YES
Y1-I
Y2-I
FAN
SPEED
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
OFF
OFF
HIGH
0v/Off
0v/Off
MIN POS
Closed
ON
OFF
HIGH
24v/On
0v/Off
MIN POS
Closed
ON
ON
HIGH
24v/On
24v/On
MIN POS
Closed
OFF
OFF
HIGH
0v/Off
0v/Off
MIN POS
Closed
Closed to Full-Open
Closed to Full-Open
ON
OFF
HIGH
0v/Off
0v/Off
MIN POS to Full
Open
ON
ON
HIGH
24v/On
0v/Off*
MIN POS to Full
Open
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for
Y1-I and Y2-I have not been satisfied.
Table 13 — Enthalpy Operation With DCV (CO2 Sensor) — 1 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
No
Below CO2 Set
Yes
No
Y1-I
Y2-I
FAN
SPEED
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN
Closed
ON
OFF
HIGH
24v/On
0v/Off
VENTMIN
Closed
ON
ON
HIGH
24v/On
24v/On
VENTMIN
Closed
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN
Closed
Closed to Full-Open
ON
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
Full-Open
ON
ON
HIGH
24v/On
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
HIGH
24v/On
0v/Off
VENTMIN to
VENTMAX
Closed
ON
ON
HIGH
24v/On
24v/On
VENTMIN to
VENTMAX
Closed
OFF
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
HIGH
0v/Off
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off*
VENTMIN to
Full-Open
Closed to Full-Open
Above CO2 Set
Yes
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for
Y1-I and Y2-I have not been satisfied.
Table 14 — Dry Bulb Operation No DCV (CO2 Sensor) — 2 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
NONE
NO
NONE
YES
Y2-I
FAN
SPEED
OFF
OFF
ON
OFF
ON
OFF
Y1-I
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
LOW
0v/Off
0v/Off
MIN POS
Closed
LOW
24v/On
0v/Off
MIN POS
Closed
ON
HIGH
24v/On
24v/On
MIN POS
Closed
OFF
LOW
0v/Off
0v/Off
MIN POS
Closed
Closed to Full-Open
Closed to Full-Open
ON
OFF
LOW
0v/Off
0v/Off
MIN POS to Full
Open
ON
ON
HIGH
24v/On
0v/Off*
MIN POS to Full
Open
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for
Y1-I and Y2-I have not been satisfied.
35
Table 15 — Dry Bulb Operation With DCV (CO2 Sensor) — 2 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
No
Below CO2 Set
Yes
No
Y1-I
Y2-I
OFF
OFF
ON
OFF
ON
ON
OFF
OFF
FAN
SPEED
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
LOW
0v/Off
0v/Off
VENTMIN
Closed
LOW
24v/On
0v/Off
VENTMIN
Closed
HIGH
24v/On
24v/On
VENTMIN
Closed
LOW
0v/Off
0v/Off
VENTMIN
Closed
Closed to Full-Open
ON
OFF
LOW
0v/Off
0v/Off
VENTMIN to
Full-Open
ON
ON
HIGH
24v/On
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
OFF
OFF
LOW
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
LOW
24v/On
0v/Off
VENTMIN to
VENTMAX
Closed
ON
ON
HIGH
24v/On
24v/On
VENTMIN to
VENTMAX
Closed
OFF
OFF
LOW
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
LOW
0v/Off
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off*
VENTMIN to
Full-Open
Closed to Full-Open
Above CO2 Set
Yes
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for Y1-I and
Y2-I have not been satisfied.
Table 16 — Enthalpy Operation No DCV (CO2 Sensor) — 2 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
NO
NO CO2 SENSOR
YES
Y1-I
Y2-I
FAN
SPEED
OFF
OFF
LOW
0v/Off
ON
OFF
LOW
24v/On
ON
ON
HIGH
24v/On
OFF
OFF
LOW
0v/Off
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
0v/Off
MIN POS
Closed
0v/Off
MIN POS
Closed
24v/On
MIN POS
Closed
0v/Off
MIN POS
Closed
Closed to Full-Open
Closed to Full-Open
ON
OFF
LOW
0v/Off
0v/Off
MIN POS to Full
Open
ON
ON
HIGH
24v/On
0v/Off*
MIN POS to Full
Open
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for Y1-I and
Y2-I have not been satisfied.
Table 17 — Enthalpy Operation With DCV (CO2 Sensor) — 2 Speed Fan
DEMAND
CONTROLLED
VENTILATION (DCV)
OUTSIDE AIR
GOOD TO
ECONOMIZE
No
Below CO2 Set
Yes
No
Y1-I
Y2-I
OFF
OFF
ON
OFF
ON
ON
OFF
OFF
FAN
SPEED
Y1-O
Y2-O
OCCUPIED
UNOCCUPIED
LOW
0v/Off
0v/Off
VENTMIN
Closed
LOW
24v/On
0v/Off
VENTMIN
Closed
HIGH
24v/On
24v/On
VENTMIN
Closed
LOW
0v/Off
0v/Off
VENTMIN
Closed
Closed to Full-Open
ON
OFF
LOW
0v/Off
0v/Off
VENTMIN to
Full-Open
ON
ON
HIGH
24v/On
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
OFF
OFF
LOW
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
LOW
24v/On
0v/Off
VENTMIN to
VENTMAX
Closed
ON
ON
HIGH
24v/On
24v/On
VENTMIN to
VENTMAX
Closed
OFF
OFF
LOW
0v/Off
0v/Off
VENTMIN to
VENTMAX
Closed
ON
OFF
LOW
0v/Off
0v/Off
VENTMIN to
Full-Open
Closed to Full-Open
ON
ON
HIGH
24v/On
0v/Off*
VENTMIN to
Full-Open
Closed to Full-Open
Above CO2 Set
Yes
*With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2-O after the delay if the call for Y1-I and
Y2-I have not been satisfied.
36
ECONOMIZING
DUAL ENTHALPY
HIGH LIMIT
AVAILABLE
NOT AVAILABLE
TH
AL
P
Y
HU
M
RH
)
RA TEMP
RA
(%
SINGLE ENTHALPY
P2 (T,RH)
ABSOLUTE HUMIDITY
EN
P1
(T,RH)
ES5
ES4
ES3
ES2
ES1
HL
TEMPERATURE
Fig. 39 — Single Enthalpy Curve Boundaries
Table 18 — Single Enthalpy and Dual Enthalpy High Limit Curves
ENTHALPY
CURVE
TEMP. DRY
BULB (F)
TEMP.
DEWPOINT (F)
ENTHALPY
(btu/lb/da)
ES1
ES2
ES3
ES4
ES5
HL
80
75
70
65
60
86
60
57
54
51
48
66
28.0
26.0
24.0
22.0
20.0
32.4
POINT P1
HUMIDITY
TEMP. (F)
(%RH)
80
36.8
75
39.6
70
42.3
65
44.8
60
46.9
86
38.9
The W (heating mode) is not controlled by the W7220 but it
requires the status to know where to position the OA damper
for minimum position for the fan speed.
The 2 speed fan delay is available when the system is programmed for 2 speed fan (in the System Setup menu item). The
2 speed fan delay is defaulted to 5 minutes and can be changed
in the Advanced Setup menu item. When the unit has a call for
Y1 In and in the free cooling mode and there is a call for Y2 In,
the 2-speed fan delay starts and the OA damper will modulate
100% open, the supply fan should be set to high speed by the
unit controller.
After the delay one of two actions will happen:
• The Y2 In call will be satisfied with the damper 100%
open and fan on high speed and the call will turn off
OR
• If the call for additional cooling in the space has not been
satisfied then the first stage of mechanical cooling will
be enabled through Y1 Out or Y2 Out.
ENTHALPY SETTINGS — When the OA temperature, enthalpy and dew point are below the respective setpoints, the
Outdoor Air can be used for economizing. Fig. 39 shows the
new single enthalpy boundaries in the W7220. There are 5
boundaries (setpoints ES1 through ES5), which are defined by
dry bulb temperature, enthalpy and dew point.
Refer to Table 18 for ENTH CURVE setpoint values.
The W7220 calculates the enthalpy and dew point using the
OA temperature and humidity input from the OA enthalpy sensor. When the OA temperature, OA humidity and OA dew
point are all below the selected boundary, the economizer sets
the economizing mode to YES, economizing is available.
When all of the OA conditions are above the selected
boundary, the conditions are not good to economize and the
mode is set to NO.
Fig. 39 shows the 5 current boundaries. There is also a high
limit boundary for differential enthalpy. The high limit boundary is ES1 when there are no stages of mechanical cooling energized and HL (high limit) when a compressor stage is energized.
Table 18 provides the values for each boundary limit.
CHECKOUT — Inspect all wiring connections at the economizer module’s terminals, and verify compliance with the installation wiring diagrams.
For checkout, review the Status of each configured parameter and perform the Checkout tests.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 28.
TWO-SPEED FAN OPERATION — The W7220 controller has the capability to work with a system using a 2-speed
supply fan. The W7220 does not control the supply directly but
uses the following input status to determine the speed of the
supply fan and controls the OA damper to the required position, see Table 19.
Table 19 — Fan Speed
STATE
OCC
Y1
Y2
W
POINT P2
HUMIDITY
TEMP. (F)
(%RH)
66.3
80.1
63.3
80.0
59.7
81.4
55.7
84.2
51.3
88.5
72.4
80.3
FAN SPEED
Low
Low
High
High
37
To clear an alarm, perform the following:
1. Navigate to the desired alarm.
2. Press the
button.
3. ERASE? displays.
4. Press the
button.
5. ALARM ERASED displays.
6. Press the
(Menu up/Exit) button to complete the action and return to the previous menu.
NOTE: If the alarm still exists after you clear it, it is redisplayed within 5 seconds.
WARNING
Failure to follow this warning could result in personal
injury, property damage, or death.
Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lock(s) and lockout tag(s). Unit may have more than one
power switch. Ensure electrical service to rooftop unit
agrees with voltage an amperage listed on the unit rating
plate.
If any wiring changes are required, first be sure to remove power from the Economizer module before starting
work. Pay particular attention to verifying the power connection (24 Vac).
CAUTION
Failure to follow this caution may result in damage to
equipment. Be sure to allow enough time for compressor
start-up and shutdown between checkout tests so that you
do not short-cycle the compressors.
Power Up — After the W7220 module is mounted and wired,
apply power.
Initial Menu Display — On initial start-up, Honeywell displays on the first line and economizer W7220 on the second
line. After a brief pause, the revision of the software appears on
the first line and the second line will be blank.
Power Loss (Outage or Brownout) — All setpoints and advanced settings are restored after any power loss or interruption.
NOTE: All settings are stored in non-volatile flash memory.
Status — Use the Status menu (see Table 8) to check the parameter values for the various devices and sensors configured.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 28.
Checkout Tests — Use the Checkout menu (on page 32) to
test the damper operation and any configured outputs. Only
items that are configured are shown in the Checkout menu.
NOTE: For information about menu navigation and use of
the keypad see Interface Overview on page 28.
To perform a Checkout test:
1. Scroll to the desired test in the Checkout menu using
the ▲ and ▼ buttons.
2.
3.
4.
5.
6.
7.
Smoke Detectors — Smoke detectors are available as fac-
tory-installed options on RGH models. Smoke detectors may
be specified for Supply Air only or for Return Air without or
with economizer or in combination of Supply Air and Return
Air. Return Air smoke detectors are arranged for vertical return
configurations only. The unit is factory-configured for immediate smoke detector shutdown operation; additional wiring or
modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project
requirements.
RETURN AIR SENSOR TUBE INSTALLATION —
The return air sampling tube is shipped in the unit’s supply fan
section, attached to the blower housing (see Fig. 40. Its operating location is in the return air section of the unit (see Fig. 41,
unit without economizer, or Fig. 42, unit with economizer), inserted into the return air sensor module housing which protrudes through the back of the control box.
To install the return air sensor sampling tube:
1. Remove the tube from its shipping location.
2. Open the unit end to access the return air sensor (located
on right-hand partition)
3. Orient the tube’s sampling holes into the return air flow
direction. For vertical application, position the sampling
holes on the bottom of the tube, facing into the bottom return duct opening. For horizontal application, position the
sampling holes on the side of the tube, facing the unit’s
end panel.
4. Insert the sampling tube into the return air sensor module
until the tube snaps into position.
5. Replace end panel or outside air hood.
Press the
button to select the item.
RUN? appears.
Press the
button to start the test.
The unit pauses and then displays IN PROGRESS.
When the test is complete, DONE appears.
When all desired parameters have been tested, press the
(Menu Up) button to end the test.
The Checkout tests can all be performed at the time of installation or at any time during the operation of the system as a
test that the system is operable.
SMOKE DETECTOR TEST MAGNET — Locate
magnet; it is shipped in the control box area.
TROUBLESHOOTING
the
ADDITIONAL APPLICATION DATA — Refer to the
Factory-Installed Smoke Detectors for Small and Medium
Rooftop Units 2-25 Tons application data for discussions on
additional control features of these smoke detectors including
multiple unit coordination.
Alarms — The economizer module provides alarm messages
that display on the 2-line LCD.
NOTE: Upon power up, the module waits 60 minutes before
checking for alarms. This allows time for all the configured
devices (e.g. sensors, actuator) to become operational. The
exception is the SAT sensor which will alarm immediately.
If one or more alarms are present and there has been no keypad activity for at least 5 minutes, the Alarms menu displays
and cycles through the active alarms.
You can also navigate to the Alarms menu at any time.
Clearing Alarms — Once the alarm has been identified and
the cause has been removed (e.g. replaced faulty sensor) the
alarm can be cleared from the display.
38
R
O
TA
TIO
N
Return Air Sampling Tube
(Shipping Location)
RETURN AIR DETECTOR
SAMPLING TUBE
Fig. 40 — Typical Supply Air Smoke Detector Sensor
Location
Fig. 42 — Return Air Sampling Tube Location in Unit
with Economizer
RETURN AIR DETECTOR
SAMPLING TUBE
Fig. 41 — Return Air Sampling Tube Location in Unit
without Economizer
Economizer
2 Position Damper
Fig. 43 — EconoMi$er® IV Wiring
39
Unit Without Economizer or
2 Position Damper
Step 13 — Adjust Factory-Installed Options
ECONOMI$ER IV OCCUPANCY SWITCH — Refer
to Fig. 43 for general EconoMi$er IV wiring. External occupancy control is managed through a connection on the Central
Terminal Board.
If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied, open
for Unoccupied sequence) at terminals marked OCCUPANCY
on CTB. Remove or cut jumper JMP 2 to complete the installation.
Step 14 — Install Accessories — Available accessories
include:
• Roof Curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• LP conversion kit
• Manual outside air damper
• High Altitude Gas kits
• Low Ambient Controls
• Thermostat / Sensors
• Two-Position motorized outside air damper
• EconoMi$er IV (with control and integrated barometric
relief)
• Power Exhaust
• Differential dry-bulb sensor (EconoMi$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO2 sensor
• Louvered hail guard
• Phase monitor control
• Winter Start kit
Refer to separate installation instructions for information on
installing these accessories.
BELT
CROSS
SECTION
SMALLEST
SHEAVE
DIAMETER
3.0-3.6
3.8-4.8
5.0-7.0
3.4-4.2
4.4-5.6
5.8-8.6
A, AX
B, BX
BELT DEFLECTION FORCE (LBS)
UNNOTCHED
NOTCHED BELTS
BELTS
USED
NEW
USED
NEW
3.7
5.5
4.1
6.1
4.5
6.8
5.0
7.4
5.4
8.0
5.7
8.4
—
—
4.9
7.2
5.3
7.9
7.1
10.5
6.3
9.4
8.5
12.6
Table 1
BELT CONDITION
New
Used
TENSION FORCE IN BELT (LBS)
100
80
Table 2
Fig. 44 — V-Belt Force Label
BELT TENSION METHOD — Requires belt tension
gauge that measures tension in belt in units of lbs force.
Step 15 — Check Belt Tension — Measure the belt
span length as shown in Fig. 44. Calculate the required deflection by multiplying the belt span length by 1/64. For example, if
the belt span length is 32 inches: 32 x 1/64 = 1/2 inch deflection.
BLOWER PULLEY
BELT FORCE — DEFLECTION METHOD — Check
the belt tension with a spring-force belt force deflection gauge
(available from drive belt manufacturer).
1. Place a straightedge along the belt between the two
pulleys. Measure the distance between the motor shaft
and the blower shaft.
V-BELT
MOTOR
PULLEY
MOTOR
2. Set the tension gauge to the desired tension (see Table 1
in Fig. 44). Place the large O-ring at that point.
3. Press the tension checker downward on the belt until the
large O-ring is at the bottom of the straightedge.
4. Adjust the belt tension as needed.
Adjust belt tension by loosing the motor mounting plate
front bolts and rear bolt (see Fig. 45) and slide the plate towards the fan (to reduce tension) or away from the fan (to increase tension). Ensure the blower shaft and motor shaft are
parallel to each other (pulleys aligned). Tighten all bolts securely when finished.
MOUNTING
BOLTS (4)
MOTOR MOUNTING
PLATE
Fig. 45 — Belt Drive Motor Mounting
Pre-Start and Start-Up — This completes the mechanical installation of the unit. Refer to the unit’s Service and Maintenance manual for detailed Pre-Start and Start-Up instructions.
40
Copyright 2018 International Comfort Products
Lewisburg, TN 37091 USA
Specifications are subject to change without notice.
Replaces: 509 01 3803 01
509 01 3813 00
START-UP CHECKLIST
(Remove and use for job file)
NOTE: To avoid injury to personnel and damage to equipment or
property when completing the procedures listed in this start-up
checklist, use good judgment, follow safe practices, and adhere to
the safety considerations/information as outlined in preceding sections of this Installation Instructions document.
I. PRELIMINARY INFORMATION
MODEL NO.: ____________________________________________ SERIAL NO.: ____________________________
DATE: ____________________________________________ TECHNICIAN: ____________________________
II. PRE-START-UP (insert checkmark in box as each item is completed)
VERIFY THAT JOBSITE VOLTAGE AGREES WITH VOLTAGE LISTED ON RATING PLATE
VERIFY THAT ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT
REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS
VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS
VERIFY FLUE HOOD IS INSTALLED
CHECK REFRIGERANT PIPING FOR INDICATIONS OF LEAKS; INVESTIGATE AND REPAIR IF NECESSARY
CHECK GAS PIPING FOR LEAKS
CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
CHECK THAT RETURN (INDOOR) AIR FILTERS ARE CLEAN AND IN PLACE
CHECK THAT OUTDOOR AIR INLET SCREENS ARE IN PLACE
VERIFY THAT UNIT INSTALLATION IS LEVEL
CHECK FAN WHEELS AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS
CHECK TO ENSURE THAT ELECTRICAL WIRING IS NOT IN CONTACT WITH REFRIGERANT LINES OR SHARP
METAL EDGES
 CHECK PULLEY ALIGNMENT AND BELT TENSION PER INSTALLATION INSTRUCTIONS













III. START-UP (REFER TO UNIT SERVICE/MAINTENANCE MANUAL FOR START--UP INSTRUCTIONS)
ELECTRICAL
SUPPLY VOLTAGE
CIRCUIT 1 COMPRESSOR AMPS
CIRCUIT 2 COMPRESSOR AMPS
INDOOR FAN AMPS
OUTDOOR FAN AMPS
L1-L2 ____________
L1 ____________
L1 ____________
____________
NO. 1 ____________
NO. 4 ____________
L2-L3 _____________
L2 _____________
L2 _____________
_____________
NO. 2 _____________
NO. 5 _____________
L3-L1 ___________
L3 ___________
L3 ___________
___________
NO. 3 ___________
NO. 6 ___________
TEMPERATURES
OUTDOOR-AIR TEMPERATURE
RETURN-AIR TEMPERATURE
COOLING SUPPLY AIR
GAS HEAT SUPPLY AIRS
_____________ DB
_____________ DB
_____________ DB
_____________ DB
_____________ WB
_____________ WB
_____________ WB
_____________ WB
PRESSURES (Heating Mode)
GAS INLET PRESSURE
GAS MANIFOLD PRESSURE
509 01 3813 00
_____________ IN. WG
_____________ IN. WG (LOW FIRE) _____________ IN. WG (HIGH FIRE)
Specifications are subject to change without notice.
CL-1
REFRIGERANT SUCTION, CIRCUIT 1
REFRIGERANT SUCTION, CIRCUIT 2
REFRIGERANT DISCHARGE, CIRCUIT 1
REFRIGERANT DISCHARGE, CIRCUIT 2
_____________
_____________
_____________
_____________
PSIG
PSIG
PSIG
PSIG
_____________
_____________
_____________
_____________
°F
°F
°F
°F
VERIFY THAT 3-PHASE FAN MOTOR AND BLOWER ARE ROTATING IN CORRECT DIRECTION
VERIFY THAT 3-PHASE SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION
VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
GENERAL
 SET ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO MATCH JOB REQUIREMENTS
(IF EQUIPPED)



Copyright 2018 International Comfort Products
Lewisburg, TN 37091 USA
CL-2
Specifications are subject to change without notice.
Replaces: 509 01 3803 01
509 01 3813 00
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - CUT ALONG DOTTED LINE
CUT ALONG DOTTED LINE
PRESSURES