Sterling MS User Manual

INSTALLATION AND SERVICE MANUAL

SEPARATED COMBUSTION

INDOOR MAKE-UP AIR UNIT ARRANGEMENTS

FOR HEATING, COOLING AND VENTILATING SYSTEMS

ATTENTION: READ THIS MANUAL, SEPARATED COMBUSTION INDOOR DUCT FURNACE SCDFM MANUAL (EVAPORATIVE OR COOLING COIL MANUALS IF APPLICABLE), UNIT SUBMITTAL DATA SHEETS AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATES FOR TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT THE POINT OF INSTALLATION. RECORD THE UNIT MODEL NUMBER AND SERIAL NO.(S) IN THE SPACE PROVIDED. RETAIN THIS DOCUMENT FOR FUTURE REFERENCE.

Model No.______________________________________________ Serial No. ________________________

MSIOM-3

J30-06624

FOR Y OUR SAFETY

The use or storage of gasoline or other flammable vapors or liquids in open containers in the vicinity of this appliance is hazardous.

If you smell gas:

1. Open windows.

2. Don’t touch electrical switches.

3. Extinguish any open ﬂ ames.

4. Immediately call your gas supplier.

FOR Y OUR SAFETY

Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. This appliance must be installed by a licensed contractor or qualified service personnel. Read these installation, operating and maintenance instructions thoroughly before installing or servicing this equipment.

APPROVED FOR USE IN CALIFORNIA

Install, operate and maintain unit in accordance with manufacturer’s instructions to avoid exposure to fuel substances or substances from incomplete combustion which can cause death or serious illness. The state of California has determined that these substances may cause cancer , birth defects, or other reproductive harm. Install and Service this product to avoid exposure to airborne particles of glasswool ﬁ bers and/or ceramic ﬁ bers known to the State of Calif ornia to cause cancer through inhalation.

12/12

INSTALLER’S RESPONSIBILITY

Installer Please Note: This equipment has been test ﬁ red and inspected. It has been shipped

free from defects from our f actory. Ho w ever, during shipment and installation, problems such as loose wires, leaks or loose fasteners may occur. It is the installer’s responsibility to

inspect and correct any problems that may be found.

RECEIVING INSTRUCTIONS

Inspect shipment immediately when received to determine if any damage has occurred to the unit during shipment. After the unit has been uncrated, check for any visible damage to the unit. If any damage is found, the consignee should sign the bill of lading indicating such damage and immediately file claim for damage with the transportation company.

IMPORTANT: Look in direction of unit air ﬂ ow to determine whether unit is right hand or left hand accessible.

260 NORTH ELM ST., WESTFIELD, MA 01085

TEL: (413) 568-9571 FAX: (413) 562-8437

www.mestek.com

TABLE OF CONTENTS

I. RECEIVING & PRE-INSTALLATION

INSTRUCTIONS ......................................................... 2

II. GENERAL INSTALLATION SAFETY

REQUIREMENTS ..............................................3, 4

Location ........................................................................4

Combustion Air Considerations ....................................4

Suspension/Rigging ..................................................5

III. INSTALLATION

Installation Clearances ...............................................11

Venting ........................................................................12

Duct Connections .......................................................13

Gas Piping ..................................................................13

Modulating Gas Control ..............................................14

Electrical Connections ..........................................14, 15

DX Coil Equipped Units ..............................................16

Chilled Water Coil Equipped Units ..............................16

Evaporative Cooling Equipped Units ..........................16

IV. OPERATION

General Information ....................................................16

Gas Control System ...................................................16

Sequence of Operation ..............................................17

Optional Gas Controls ................................................17

Air Handling Requirements and Adjustments ............18

Lighting .......................................................................19

Gas Input Adjustment ................................................. 19

Pilot Adjustment .......................................................... 20

Primary Air Shutter Adjustment .................................. 20

Controls ......................................................................20

V. START UP ......................................................20, 21

VI. MAINTENANCE .......................................21 thru 24

VII. TROUBLESHOO TING ............................25 thru 30

VIII. REPLACEMENT PARTS ...................................30

IX. SERVICE NOTE ...................................................30

X. W ARRANTY ..........................................................30

Canadian Installations ...............................................31

XI. DIMENSIONAL DATA ..............................32 thru 37

XII. MOTOR ELECTRICAL DATA .............................38

XIII. UNIT/SHIP WEIGHTS ........................................39

XIV. COOLING COIL DIMENSIONAL DATA ............40

XV. SUBMITTAL INDEX ............................................41

XVI. MODEL NUMBER DESCRIPTION ....................42

XVII. START UP SHEET ...........................................44

Unless otherwise speciﬁ ed, the following conversions may be used for calculating SI unit measurements: 1 foot = 0.305 m 1 inch = 25.4 mm 1 psig = 6.894 kPa 1 pound = 0.435 kg 1 gallon = 3.785 L 1 cubic foot = 0.028 m

1 inch water column =0.249 kPa 1000 Btu per hour = 0.293 kW 1000 Btu/Cu. Ft. = 37.5 MJ/m

liter/second = CFM x 0.472 meter/second = FPM ÷ 196.8

The following terms are used throughout this manual to bring attention to the presence of potential hazards or to important information concerning the product:

Indicates an imminently hazardous situation which, if not av oided, will result in death, serious injury or substantial property damage.

Indicates an imminently hazardous situation which, if not avoided, could result in death, serious injury or substantial property damage.

Indicates an imminently hazardous situation which, if not avoided, may result in minor injury or property damage.

NOTICE: Used to notify of special instructions on installation, operation or maintenance which are important to equipment but not related to personal injury hazards.

I. RECEIVING INSTRUCTIONS

Make-up Air Units with multiple furnaces are shipped in sections. Each section has a label with Order no.,

Model No., Unit No., and Part No. marked on it. Make certian that the order, model, and part numbers agree on each section to be connected together.

Inspect shipment immediately when received to determine if any damage has occurred to the crate during shipment.

After the unit has been uncrated, check for any visible damage to the unit. Check motor position and turn blower wheel to determine if damage has occurred to these critical parts.

If any damage is found, the consignee should sign the bill of lading indicating such damage and immediately ﬁ le claim for damage with transportation company.

PRE-INSTALLATION INSTRUCTIONS

When the unit is received and uncrated, check the external data plate and all labels on the unit for type of gas, electrical, and operational speciﬁ cations to conﬁ rm that these agree with those at point of installation. The unit is equipped with an Indoor Duct Furnace; also check the data plate and all labels located on each furnace.

Every Mak e-Up Air Unit will include an informational packet which will include the following: This make-up air manual, duct furnace, ev aporative cooler/ cooling coil manuals (if applicable to the unit order), wiring diagram(s), and special controls/data sheets.

— 2 —

II. GENERAL SAFETY REQUIREMENTS

Open all disconnect switches before installing the unit. If the po wer disconnect is out of sight, lock it in the open position and ta g it to prevent unexpected application of power. Failure to do so may result in personal injury or death from electrical shock.

Failure to comply with the general requirements may result in extensive property damage, severe personal injury or death.

Never service any component without ﬁ rst disconnecting all electrical and gas supplies to the unit or severe personal injury or death may occur.

1. Installation must be made in accordance with local codes, or in absence of local codes, with the latest edition of ANSI Standard Z223.1 (N.F.P.A. No 54) National Fuel Gas Code. All ANSI and NFP A Standards referred to in these installation instructions are the ones that were applicable at the time the design of this appliance was certiﬁ ed. The ANSI Standards are available from the National Standards Institute, Inc., 11 West 42nd Street, New York, NY 10036 or www. ansi.org. The NFPA Standards are available from the National Fire Protection Association, Batterymarch Park, Quincy , Massachusetts 02269. The heaters are designed for use in airplane hangers when installed in accordance with ANSI/NFP A No . 409 and in public garages when installed in accordance with the NFP A No. 88A and NFPA No. 88B.

2. If installed in Canada, the installation must conform with local building codes, or in the absence of local building codes, with the current CSA-B149.1 or B149.2 “Installation Codes for Gas Burning Appliances and Equipment”. These indoor duct furnaces have been designed for and certiﬁ ed to comply with CSA 2.6.

5. Follow installation instructions CAREFULLY to avoid creating unsafe conditions. All wir ing should be done and checked by a qualiﬁ ed electrician, using copper wire only . All gas connections should be made and leak-tested by a suitably qualiﬁ ed individual, per instructions in this manual.

6. Use only the fuel for which the heater is designed (see nameplate). Using LP gas in a heater that requires natural gas, or vice versa, will create the risk of gas leaks, carbon monoxide poisoning and explosion.

Do not attempt to convert the heater for use with a fuel other than the one intended. Such conversion is danger ous, as it could create unsafe conditions that result in death, serious injury or substantial property damage.

7. Make certain that power source conforms to electrical requirements of heater. Disconnect power before installing or servicing heater. If power disconnect is out of sight, lock it in open position and tag it to prevent unexpected application of power. Failure to do so could result in fatal electric shock.

Do not depend upon a thermostat or other switch as the sole means of disconnecting power when installing or servicing heater. Always disconnect power at main circuit breaker as described above. Failure to do so could result in fatal electric shock.

8. Special attention must be given to any grounding information pertaining to this heater. To prevent the risk of electrocution, the heater must be securely and adequately grounded. This should be accomplished by connecting a grounded conductor from the service panel to the conduit box of the heater. T o ensure proper ground, the g rounding means must be tested by qualiﬁ ed ﬁ eld electrician.

3. No alterations are to be made on this equipment. The duct furnace section (capacities 100 thru 400 MBH)

of these make-up air units are certiﬁ ed by ETL for use with natural and LP (propane) gases!

Do not alter the duct furnace in any way or damage to the unit, se vere personal injury or death will occur.

4. Make certain that the power sources conform to the requirements of the heater.

— 3 —

9. Do not insert fingers or foreign objects into the heater or its air moving device. Do not bloc k or tamper with the heater in any manner while in operation or just after it has been turned off, as some parts may be hot enough to cause injury.

10. This heater is intended for general heating applications ONLY. It must NOT be used in potentially dangerous locations such as ﬂ ammable explosive, chemical-laden or wet atmospheres.

In cases in which property damage may result from malfunction of the heater, a backup system or a temperature sensitive alarm should be used.

LOCATION

Before placing the Make-Up Air unit in its permanent location, make certain that the structure is capable of carrying the additional load of this equipment. Check the unit weight given at the end of this manual.

LOCA TIONS TO A V OID

Unit heaters should not be installed within corrosive or ﬂ ammable atmospheres. Do not locate any gas ﬁ red heater where air for combustion contains chlorinated vapors or acid fumes.

Refer to unit data plate for required clear ances to combustible material, and Figure 11 for manufacturer’ s recommendations .

Do not place unit in a location where service personnel can not safely service this equipment or personal injury could result.

NOTICE: When selecting a location for these MakeUp Air Units, both the size of the unit and the heating requirements of the building must be considered.

NOTICE: The furnace section(s) of this unit is equipped for bottom access serviceability only! Provide adequate clearance (base rail to ﬂ oor is 18 inches minimum).

COMBUSTION AIR CONSIDERATIONS

The presence of chlorine vapors or other corrosive vapors in the combustion air supply for gas-ﬁ red heating equipment presents a potential corrosive hazard. Chlorine will, when exposed to ﬂ ame, precipitate from the compound (usually freon or degreaser vapors) and go into solution with any condensation that is present in the heat exchanger or associated parts. The result is hydrochloric acid which will readily attack all metals, including 300 grade stainless steel. Care should be taken to separate these vapors from the combustion process.

Presence of these air impurities can cause premature failure of the heat exchanger and void the warranty (See limited warranty on page 30).

The venting system must be installed in accordance with heater manufacturer’ s instructions. The venting system is an integral part of the unit and must not be altered in

the ﬁ eld!

MOUNTING HEIGHT

When a Gas Fired Make-Up Air Handler is discharging directly into the heated space, a mounting height of eight feet (2.4m) above the ﬂ oor is recommended. Less efﬁ cient air distribution results at higher levels.

2. When Gas Fired Indoor Make-Up Air Handlers are

installed in airplane hangars, NFP A speciﬁ es that the units must be at least ten feet (3.0m) abov e the upper surface of wings or engine enclosures of the highest aircraft to be stored in the hangar. This measurement should be made from the wing or engine enclosure (whichever is higher from the ﬂ oor) to the bottom of the heater. Heaters must be installed at least eight feet (2.4m) abov e the ﬂ oor in shops, ofﬁ ces, and other sections of the hangar where aircraft are not stored or housed. Refer to NFPA 409 Aircraft Hangars.

3. In parking structures, Gas Fired Indoor Make-Up Air

Handlers must be installed so that the burner ﬂ ames are located 18" (457mm) above the ﬂ oor or protected by a partition not less than 18" (457mm) high as speciﬁ ed in NFPA 88A Parking Structures.

4. In public repair garages, Gas Fired Make-Up Air

Handlers must be installed in a detached building or room separated from repair areas as speciﬁ ed in NFPA 88B Repair Garages.

— 4 —

SUSPENSION/RIGGING

Make certain that the structure to which the single, dual, triple furnace and air handler sections is to be mounted is capable of supporting its weight. Under no circumstances must the gas lines, the venting system or the electrical conduit be used to support the heater; or should any other objects (i.e. ladder, person) lean against the heater , gas lines, venting system or the electrical conduit for support.

The unit should never be lifted by any unit component other than the base rail assembly. Unit components other than base rail assembly are not designed to support the total weight and may break, causing personal injury or unit damage.

Units can be set on field furnished supports/cradle with access available to furnace bottom section, or suspended by rod hangers from the sub-frame (and lifting brackets).

Any unit that has a side base rail longer than 104" (2.6m) requires additional ﬁ eld furnished supports by a qualiﬁ ed installer. Refer to all dimensional data in this manual. If further information is required, contact the manufacturer’s technical service department.

Rig unit using either belt or cable slings. Use spreader bars to protect the top of the unit when it is lifted. Mak e sure all hardware used in the lifting/mounting process is tightened and secured.

Refer to Figures 1 and 2 for Single Furnace Make-Up Air Unit rigging requirements. Refer to Figures 3, 4 and 5 for Dual/Tr iple Furnace Make-Up Air Unit rigging requirements, which ships to the site in two sections (Figure 3 is the air handler section and 4 and 5 are the furnace sections.).

On units with a total length of less than 104" (2642mm), excluding evaporative cooler, two holes are provided in the base rail on each side of the unit. Slide pipes beneath the unit through these holes and attach rigging to pipes for lifting the unit.

On units with a total length of a 104" (2642mm) or greater, excluding evaporative cooler, lifting lugs/brackets attached to the base rail are provided. Once the unit is set in place these lifting brackets may be removed if required.

Attach rigging to lugs/brackets for lifting the unit. For distance between lifting lugs/brackets and total unit lengths, refer to the Dimensional Data section of this manual.

The unit must be hung level from side to side and front to back. It is recommended to use the (9/16" diameter) hanging holes in the skid rail, and 1/2" threaded rod or pipe, and/or whatever other supports may be required to adequately support the unit. A ﬁ eld supplied cradle or other means of support may also be required. The installer is responsible for determining adequate and safe suspension methods.

— 5 —

Figure 1 -

(4) Lifting Point Locations (2) At Each End Of Air Handler Unit

Use Spreader Bars To Prevent Damage To Units

D6559

(8) Lifting Point Locations (4) On Each Side Of Duct Furnace Unit

Use Spreader Bars To Prevent Damage To Units

(6) Lifting Point Locations (3) On Each Side Of Duct Furnace Unit

Use Spreader Bars To Prevent Damage To Units

Hoisting of Make-Up Air Unit (Single Furnace)

Without Lifting Brackets

Figure 2 -

Hoisting of Make-Up Air Unit

With Lifting Brackets

Figure 4 - Hoisting Double Furnace Unit

D6558

Figure 5 - Hoisting Triple Furnace Unit

(Single Furnace)

Figure 3 - Hoisting Make-Up Air Handler Unit

D6558

Refer to Figures 3, 4 and 5 for dual/triple furnace Make Up Air rigging requirements. Dual/triple furnace units ship to the site in two sections (Figure 3 is the air handler section; Figures 4 and 5 are the furnace sections).

— 6 —

III. INSTALLATION

Refer to all dimensional data within the manuals equipped with your unit.

SINGLE FURNACE UNITS

Single furnace units (capacities 10-40) consist of a furnace section and an air handler section mounted on a common base rail.

MULTIPLE FURNACE UNITS

Multiple furnace units consist of two sections: a furnace section with two duct furnaces (capacities 50-80) or three duct furnaces (capacity 12) mounted on a common base rail; and a separate air handler section mounted on its own base rail. A ﬂ exible connector kit is also equipped with your unit. Each section has a label with Order

No., Model No., Unit No., and Part No. marked on it. Make certain that the order, model, and part numbers agree on each section to be connected together . The

two sections should be moved individually and mounted in their permanent location (see “Suspension/Rigging” sections). Ensure that both ﬂ ange assemblies are in alignment with a 5" (127mm) space between the ﬂ ange assemblies. See the f ollo wing instructions for installation of the ﬂ exible connector kit between the two sections.

INSTALLING FLEXIBLE CONNECTOR - Refer to Figure 6

1. Make sure that the furnace section and the air

handler section are in alignment and installed with a 5" (127mm) space between the ﬂ ange assemblies.

2. Remove the top e xtension panel of the duct furnace

for access to the inside bottom ﬂ ange assemblies.

4. Measure the distance from the top of the ﬂ ange assembly to the slot at the bottom of the ﬂ ange assembly. Make a second 90 degree bend at the measured distance from the ﬁ rst bend in the ﬂ exible duct connector.

5. Slide the flexible connector through the slots in the ﬂ ange assemblies until the vertical par t is tight against the sides of the ﬂ ange assemblies.

Bend second vertical section up around the ﬂ anges. Make sure all bends are straight and ev en for proper ﬁ t.

7. Bend down top section of ﬂ exible connector. Cut metal parts of ﬂ exible connector to o verlap the 4 inch section by at least 1-1/2 inches (38mm), but cut the fabric portion 1-1/2 inches longer than the metal.

8. Screw metal portions of ﬂ exible connector to the flange assemblies using drill screws. Space the screws approximately 4 to 6" (102 to 152mm) on center. Fasten the bottom section in place by screwing down from the inside. Fasten the overlapped area with two screws in the metal on each side of the fabric. Seal the fabric joint with RTV sealer and allow to cure . Replace and reseal top extension panel on furnace section.

9. Apply sealing tape to seams between ﬂ anges and ﬂ exible connector and to vertical ﬂ ange connections. Test for air leaks during initial start-up. Reseal as required.

Table 1 - Flexible Connector Kit

3. Measure ﬂ exible connector in the ﬂ at to conﬁ rm that it is correct for the unit being installed. Refer to Table

1. Make a 90 degree bend 4" (102mm) from one end of the ﬂ exible duct connector.

Unit (Approx.) Straight Length Capacity Flexible Connector (CA) Required

50 102 Inch (2.59m) 60 114 Inch (2.90m) 70 124 Inch (3.15m) 80/12 135 Inch (3.43m)

— 7 —

Furnace Assembly

Flange Assembly

with Flange

Mounts to

Air Handler

Approx.

for Flexible

2" Slots

Connector

AIR FLOWAIR FLOW

Panel

Top Extension

STEP 1

14.500

Approx.

5.000

Approx.

9.000

***

* * *

***

D6453-1

side of unit

Bend at approx.

4" on access

Assembly on both Furnace and Air Handler

to bottom of the inside of Flange

Remove Top Extension Panel of Duct Furnace to fasten Flexible Connector

Connector into

Slide Flexible

place tightly

before fastening

sheet metal for

1-1/2" Overlap

proper installation

1-1/2" Overlap

fabric for

Furnace

Duct

(4) Slots

STEP 2 STEP 3

Bend at 90∞

STEP 4

STEP 5

D6453-2

Figure 6A

Figure 6B

— 8 —

Flexible Connector

Continue bending

tightly around Flange

Assembly making sure

bends are neat and even

Keep uniform distance

around Flange Assembly

on all sides, (approx. 2")

D6453-3

STEP 6

STEP 7

Figure 6C

Figure 6D

using Drill Screws provided

fasten Flexible Connector to

Flange Assembly securely

space Screws between 4" - 6"

keep uniform distance

around Flange Assembly

on all sides (approx. 2")

for sheet metal overlap use (2)

screws on each side of fabric

Flexible Connector Assembly ready for

application of Sealing

Tape provided for testing

for air leaks (see sht. 5)

Use Sealant between

layers of fabric for

proper installation (by others in field)

STEP 8

D6453-4

— 9 —

AIR FLOW

D6453-5

14.500

stips of Sealing Tape to be

continuous or overlapping

used when sealing Flexible

Connector to Flange Assembly

Approx.

5.000

Approx.

AIR FLOW

9.000

Approx.

***

* *

***

use Sealing Tape on

inside of Bottom Flange

Flexible

Connector

Flange

Assembly

Sealing Tape covers

Screw heads and seams

Figure 6E

STEP 9

on Flange

connections

use Sealing Tape

— 10 —

Figure 7 - Arrangement B & D Capacities10/40

D6554

(8) Suspension Point Locations (4) On Each Side Of Unit

D6555

(4) Suspension Point Locations (2) At Each End Of Air Handler Unit

(6) Suspension Point Locations (3) On Each Side Of Duct Furnace Unit

Both Units Must Be Suspended At Same Height For Proper Fit Of Flex Connector

D6556

Both Units Must Be Suspended At Same Height For Proper Fit Of Flex Connector

(4) Suspension Point Locations (2) At Each End Of Air Handler Unit

(8) Suspension Point Locations (4) On Each Side Of Duct Furnace Unit

Figure 8 - Arrangement G Capacities 10/40

INSTALLATION CLEARANCES

Minimum clearances to combustible material are shown on the unit data plate. It is important that clearances be maintained for servicing the unit, and that minimum clearances are provided from the unit to combustible material. Clearances around the ﬁ eld installed optional outside air hood (if unit is to be connected to one) must be unobstructed. See Figure 11.

Under no circumstance should combustible material be located within the speciﬁ ed clearances. Failure to provide proper clearance could result in personal injury or property damage from ﬁ re.

Every gas appliance should be located with respect to building construction and other equipment so as to permit access to the unit. Clearances between ver tical walls and the vertical sides of the heater should be no less than 18" (457mm). Minimum clearance between the top of the heater and the ceiling is 6" (152mm). The minimum clearance to the bottom of the furnace is 25" (635mm). The minimum clearance from combustibles to the ﬂ ue collector is 6" (152mm). The minimum clearance from combustibles to the vent pipe is 6" (152mm). See Figure 11.

Figure 9 - Arrangement G Capacities 50/80

Figure 10 - Arrangement G Capacity 12

— 11 —

*It is recommended that adequate clearance be kept to the bottom of the furnace(s) to make sure a service technician can safely service the unit(s),

The unit should never be lifted by furnace sections, blower housing/filter/sections, motor mounts or ﬂ ue connections. These are not designed to support total weight of the unit, and may break, causing personal injury or property damage!

Make certain that the lifting methods used to lift the Make-Up Air Unit are capable of supporting the weight of the heater during installation. Failure to heed this warning may result in property damage or personal injury.

Make certain that the structure to which heater is to be mounted is capable of safely supporting its weight. Under no circumstances must the gas lines or the electrical conduit be used to support the heater. Failure to heed these warnings may result in property damage, personal injury or death.

Open all disconnect switches before installing the unit. Failure to do so may result in personal injury or death from electrical shock.

Inspect the suspension and/or support system for the make-up air unit to ensure that all fasteners are tight and the unit is secure before working underneath the unit. Failure to do so could result in property damage, personal injury, or death.

Figure 11 - Manufacturer’s Recommended Service Clearances

5/16

(8mm)

5/16

(8mm)

5/16

(8mm)

5/16

(8mm)

D6573

Field

Ductwork

18(457mm)

Air

Inlet

18 (457mm)

AIR FLOW

17.5 (444mm)

Ductwork

18(457mm)

(635mm)

Field

AIR FLOW

Supply

Ductwork

5/16

(8mm)

5/16

(8mm)

5/16

(8mm)

5/16

(8mm)

36 (914mm)

Ductwork

Note: Recommended ceiling clearance 36" (914mm) is to the top of the furnace venting collar assembly.

18 (457mm)

Supply

VENTING†

All venting installations shall be in accordance with the latest edition of Part 7, “Venting of Equipment”, of the National Fuel Gas Code, ANSI Z223.1 or applicable provisions of local building codes.

CARBON MONOXIDE! Your venting system must not be blocked by any snow, snow drifts or any foreign matter. Inspect your venting system to ensure adequate ventilation exists at all times! Failure to heed these warnings could result in Carbon Monoxide Poisoning (symptoms include grogginess, lethargy, inappropriate tiredness, or ﬂ ulike symptoms).

The venting is an integral part of

the unit and must not be altered in the ﬁ eld.

†Refer to the Separated Combustion Indoor Duct Furnace Manual for more venting requirements.

Vent Systems

Termination Clearance Requirements

Minimum Clearance

Structure/Object

for Termination Locations

USA CANADA

Door, window, or gravity vent inlet; combustion air inlet for other appliances

9 inch for 10,000 to 50,000 BTU/Hr input; 12 inch for input exceeding 50,000 BTU/Hr.

9 inch (230mm) for 10,000 to 50,000 BTU/Hr input; 12 inch (305mm) for input exceeding

50,000 BTU/Hr. Forced air inlet within 10 feet 3 feet above 6 feet (1.8m) Adjoining Building or parapet 6 feet 6 feet (1.8m)

Adjacent public walkways

7 feet above grade

7 feet (2.1m) above

grade

3 feet (0.9m)

horizontally from

meter/regulator Electric, gas meters & regulators

4 feet horizontal

asembly. 6 feet

(1.8m), any

direction, from

a gas service

regulator vent outlet Above grade level* 1 foot* 1 foot (0.3m)*

*If the vent terminal is to be installed near ground level, the vent terminal must be positioned at least six inches (152mm) above the maximum anticipated snow depth.

— 12 —

DUCT CONNECTIONS

All ductwork must be properly supported so that no strain is put on the unit. Do not alter or bend the discharge duct ﬂ anges supplied on your make-up air unit.

Duct connections must have a removable access panel in the duct which is connected to a duct furnace. The duct openings shall be accessible when the unit is installed in service, and shall be of such size that smoke or reﬂ ected light may be observed inside the casing to indicate the presence of leaks in the heating element. The covers for the panels shall be attached in such a manner as to prevent leaks . Ducts (or optional outside air hoods) exposed to the outdoors must be insulated and sealed to prevent water from entering either the unit or building through the duct.

To avoid equipment damage or possible personal injury, do not connect gas piping to this unit until a supply line pressure/ leak test has been completed. Connecting the unit before completing the pressure/leak test may damage the unit gas valve and result in a ﬁ re hazard.

Do not rely on a gas shutoff valve to isolate the unit while conducting gas pressure/leak tests. These valves may not be completely shutoff, exposing the unit gas valve to excessive pressure, resulting in damage.

Do not over-tighten the inlet gas piping at unit gas valve or stresses that could crack the valve may result.

If a single, double or triple duct furnace only unit is connected to a return air duct, or any other inlet air restriction, the appliance shall be installed on the positive pressure side of the air circulating blower.

When connecting return air duct to Standard or High CFM cabinets, attach duct to return air opening ﬂ ange when no dampers are used. Otherwise, if dampers are used, attach return air duct around collar at bottom of damper assembly. Also refer to the Dimensional Data section of this manual, Submittal Data Sheets and Indoor Duct Furnace Manual speciﬁ ed for your unit.

GAS PIPING††

All gas piping must be installed in accordance with local codes. It is required that a ground union be installed adjacent to the gas valve of each duct furnace, and a ground union be installed just external of each duct furnace for unit servicing. On vertical runs, a drip leg should be provided upstream of any control manifold. A gas shutoff valve should be, or may be required by local codes, installed upstream of the external ground union for each duct furnace. A 1/8" N.P.T. plugged tapping, accessible for test gauge connection, must be installed immediately upstream of the unit gas supply connection.

Never use an open ﬂ ame to detect gas leaks. Explosive conditions may e xist which would result in personal injury or death.

The gas line should be supported so that no strain is placed on the unit. Pipe compounds which are not solub le to liquid petroleum gases must be used on threaded joints.

The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).

The appliance must be isolated from the gas supply piping system by closing the individual manual shutoff valv e during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

For additional gas piping information, including pipe sizing and drip leg installation, refer to Separated Combustion Indoor Gas-Fired Duct Furnace Installation and Service Manual.

For additional piping information, refer to the National Fuel Gas Code Z233.1 (latest edition).

The open end of piping systems being purged shall not discharge into areas where there are sources of ignition or into conﬁ ned spaces UNLESS precautions are taken as follows: (1) By ventilation of the space, (2) control of purging rate, (3) elimination of all hazardous conditions. All precautions m ust be taken to perform this operation in a safe manner!

†† For complete Gas Piping installation, see the Separated Combustion Indoor Gas-Fired Duct Furnace Installation and Service Manual.

— 13 —

NOTICE: If the gas duct furnace is to be ﬁ red with LP gas, consult local LP gas dealer for piping size information.

NOTICE: Unit installation for use with propane (bottled) gas must be made by a qualiﬁ ed LP gas dealer or installer. He will insure proper joint compounds are used for making pipe connections; that air is purged from lines; that a thor ough test is made for leaks before operating the unit; and that it is properl y connected to propane gas supply system.

Before any connection is made to an e xisting line supplying other gas appliances, contact the local gas company to make certain that the existing line is of adequate size to handle the combined load.

Check all connections for leaks with soap solution.

MODULATING GAS CONTROL (OPTIONAL)*

AIR FLOW AIR FLOW

Electrical Cabinet

Air Handler

Junction Box

Duct Furnace

Conduit

Low Voltage

Conduit

Line Voltage

D03304

*** *

***

Electronic: On units equipped with electronic modulating control, follow control manufacturer’s installation instructions for sensing of outlet air temperature.

*Also refer to the Separated Combustion Indoor Duct Furnace Installation Manual supplied with your unit.

ELECTRICAL CONNECTIONS

Do not use any tools (i.e. screwdriver, pliers, etc.) across terminals to check for po wer. Use of a voltmeter is recommended.

Locate the thermostat in accordance with the instructions supplied with the thermostat. All ﬁ eld wiring must have a minimum temperature rating of 185°F (85°C). Control wiring shall be a minimum of 18 gauge wire size. Control wiring must be sized for length of run.

HAZARDOUS VOL TAGE!

DISCONNECT ALL ELECTRIC POWER INCLUDING REMOTE DISCONNECTS BEFORE SERVICING. Failure to disconnect power before servicing can cause severe personal injury or death.

All electrical connections must conform to: the latest edition of ANSI/NFPA No. 70, National Electrical Code, and applicable local codes. In Canada, to the Canadian Electrical Code, Part I CSA Standard C22.1.

Single furnace make-up air packaged units are wired at the factory and are ready to be connected. Multiple furnace make-up air units are shipped in two parts, the air handler section and the furnace section. After mounting the two sections and installing the ﬂ exible duct connector, connect the free end of the ﬂ exible conduits from the air handler section to the junction box on the duct furnace. Each wire has a distinctive marking. Connect each wire to its respectively marked terminal in the duct furnace junction box. See Figure 13A. Actual unit wiring will differ according to the options chosen. Each unit is shipped with its own wiring diagram; refer to this wiring diagram for all electrical connections to the unit.

Locate line voltage disconnect box per local codes. If mounting the disconnect box to the unit, never mount it to a unit access panel. Possible locations include the front of the blower or ﬁ lter section (See Figure 15). Electrical conduit must be routed so as not to interfere with removal of any access panel.

NOTICE: Should any original wire supplied with the unit have to be replaced, it must be replaced with wiring having a temperature rating of at least 221°F (105°C).

Figure 13A

All line voltage and thermostat connections are made in the Electrical Cabinet (See Figure 13B). Line voltage connections are made at the High Voltage Terminal Block. Thermostat connections are made at the Main Connection Board (See Figure 14).

— 14 —

Figure 13B - Make-Up Air Unit-Standard Blower Cabinet, Single Duct Furnace with Various Options Shown

D4108

Disconnect Box

Disconnect Box Located On Outside Air Application

D4109

Disconnect Box

Disconnect Box Located On Outside Air Application

Field Ductwork For Outside Air Inlet

RETURN AIR

AIR FLOW

OUTSIDE AIR

12345 6 7

Dampers/Filters/ Blower Cabinet

8 910

FurnaceCabinet

Electrical Duct

D6572

1. Mixed Air Controller

2. Return Firestat

3. Economizer

4. Filters

5. Blower Motor

6. Reverse Air Flow Switch

7. Clogged Filter Switch

8. High Voltage Barrier, Lamp and Circuit Breaker Mount

9. Main Connection Board with Fan Time Delay and Function Relays

10. Power Venter Motor Assembly (includes Relay and Air Pressure Switch)

11. Ignition Module (not shownlocated in burner compartment)

12. Time Delay Freezestat

13. Supply Firestat

14. Duct Thermostat

15. Safety Limit Switch

16. Gas Valve

17. Primary High Limit Switch

18. Transformer

19. Electrical Wiring Inlet

20. High Voltage Terminal Block

21. Door Safety Switch

22. Contactor

23. Centrifugal Blower

24. Damper Motor

25. Outside and Return Dampers

26. Ambient Lockout

27. CO2 Monitor

Figure 14 - Electrical Cabinet

Figure 15 - Disconnect Box Locations

Return Air Inlet

Outside Air Inlet

— 15 —

DX COIL EQUIPPED UNITS (OPTIONAL)

Drain Pan Connection

Total

Height

of Trap

X = 1/2 “H” H = At Least 1 Inch Plus Casing Static Pressure

D3887

Total Height Of Trap = X+ H + (1-1/2 X Pipe Diameter) (without Insulation)

Unit

Housekeeping

Pad

See Coil Installation/Maintenance Manual for Refrigerant Piping, Liquid and Suction Line Components, Refrigerant Charging and Thermal Expansion Valve Adjustment. Remove coil cabinet access door located next to blower section. Cut holes in ﬁ xed door to allow suction and liquid line passage. Provide weatherproof seal around suction and liquid lines at piping plate when installed.

The DX Coil has a 300 ft/min. (1.524 m/s) minimum and a 600 ft/min. (3.048 m/s) maximum velocity through the coil requirement. This is due to prevention of coil icing or condensate blow-off. To calculate the velocity through the coil, apply the following formula:

Figure 16 - Drain Pan Connection

Velocity = through the coil

Condensate Drain piping must have a P-trap in line immediately downstream of drain pan connection, external to the unit, to prevent possible outside air leakage into unit. The P-trap shall be of sufficient differential to overcome negative pressure of the indoor air blower. A minimum height difference of 2" (51mm) is required (See Figure 16). Before unit operation begins, the P-trap must be primed with either water (summer) or glycol (winter).

CHILLED WATER COIL EQUIPPED UNITS (OPTIONAL)

See Coil Installation/Maintenance Manual for General Coil Piping Recommendations. Remove coil cabinet access door, cut holes in door to allow chilled w ater piping passage. Provide weatherproof seal around chilled water pipes at piping plate when installed.

The Chilled Water Coil has a 600 ft/min (3.048 m/s) maximum velocity through the coil requirement. This is due to prevention of condensate blow-off. To calculate the velocity through the coil apply the following formula:

Velocity = through the coil

Condensate Drain piping must have a P-trap in line immediately downstream of drain pan connection, external to the unit, to prevent possib le outside air leakage into unit. The P-trap shall be of sufﬁ cient differential to overcome negative pressure of the indoor air blower. A minimum height difference of 2" is required (See Figure

16). Bef ore unit operation begins, prime P-trap with either water (summer) or glycol (winter).

EVAPORATIVE COOLER EQUIPPED UNITS (OPTIONAL)

Refer to Evaporative Cooler Installation and Service Manual for water and electrical connections.

Cooling Air Flow in CFM (m3/s)

Coil Surface Area in ft2 (m2)

Cooling Air Flow in CFM (m3/s)

Coil Surface Area in ft2 (m2)

IV. OPERATION

GENERAL INFORMATION

Refer to Separated Combusion Indoor Gas-Fired Duct Furnace Installation and Service Manual for speciﬁ c information regarding the heating operation of this unit.

All units are equipped with an intermittent ignition pilot system. The pilot is lit and e xtinguished each cycle of unit heating operation.

On natural gas units, the ignitor will continue to spark and pilot gas will continue to ﬂ ow until the pilot ﬂ ame is proven.

LP (propane) units are equipped with 100% lockout. The lockout function shuts off the main and pilot gas valves if the pilot gas fails to ignite within 90 seconds of the onset of trial for ignition.

The gas control system operates at 24 VAC and is supplied by a stepdown transf ormer found in the electrical cabinet that will match the unit line voltage speciﬁ ed. See Figures 13 through 15 for unit controls location.

Do not use a thermostatic fan control switch when either two-stage ﬁ ring or modulated gas controls are used.

GAS CONTROL SYSTEM

The standard unit comes equipped for single stage operation. Unit heating operation is accomplished at full input.

Each duct furnace is equipped with an individual ignition control system which consists of the following components: ignition control module, gas valve and pilot burner.

The ignition control module is the heart of the ignition control system. This control initiates all gas ﬂ ow , provides means to light the pilot burner, proves and monitors the pilot burner operation.

— 16 —

The gas valve consists of two operators which provide gas to the pilot and main burners. Both operators are energized and de-energized by the ignition control module each heating cycle.

The pilot burner includes an ignitor and ﬂ ame sense probe. The ignitor provides the spark, originating at the ignition control module, to light the pilot. The ignition control module proves and monitors the pilot ﬂ ame through the ﬂ ame sensing probe.

SEQUENCE OF OPERATION

All units follow the same basic sequence of operation and is as follows:

1. Thermostat calls for heat. Draftor relay energizes draftor with call for heat.

2. Pressure switch closes circuit to ignition control module.

3. Ignition control module energizes pilot operator of gas valve and initiates spark at ignitor of the pilot burner.

4. Pilot burner ignition is proven to the ignition control by the ﬂ ame sense probe and sparking of the ignitor is discontinued.

5. Once pilot burner operation is proven, the ignition control module energizes the main burner operator of the gas valve, allo wing gas ﬂ ow to the main burners.

6. Approximately 60 seconds after the main burners light, the fan time delay initiates fan operation.

7. Thermostat is satisfied and call for heat is removed. Draftor relay de-energizes draftor with removal of call f or heat.

8. Ignition control module de-energizes pilot and main burner operators of the gas valve , ceasing all gas ﬂ ow.

Three Stage Units: Dual duct furnace models: First furnace is equipped with two stage heating; second furnace is equipped with single stage heating but ﬁ red independently, giving three stages of heating. Triple duct furnace models: Each duct furnace is equipped with single stage heating but fired independently, giving three stages. Each stage is 33% of the unit’s full input rate. Duct furnace one will always light ﬁ rst and disengage last.

Four Stage Units: Dual duct furnace models only. Each duct furnace is equipped with two stage heating but ﬁ red independently, giving four stages. Each stage is 25% of the units full input rate. Duct furnace one will always light ﬁ rst and disengage last.

Six Stage Units: Triple duct fur nace models only. Each duct furnace is equipped with two stage heating but ﬁ red independently giving six stages. Each stage is 16.5% of the units full input rate. Duct furnace one will always light ﬁ rst and disengage last.

Electronic Modulation Units: These units are equipped with an electronic modulating control which provides unit ﬁ ring capabilities of 50 to 100% of the units full input rate. This control is found in the gas train downstream of the gas valve and allows main bur ner ignition only at the maximum rate. A thermostat with remote setpoint adjustment modulates the gas input.

Multi-Stage w/Electronic Modulation Units:These dual and triple duct furnace models are equipped with an electronic modulating control on duct furnace one and single or two stage heating on each successive duct furnace. Furnace one (modulated) will ﬁ re ﬁ rst and disengage last. Additional stages of heat will engage after furnace one has ﬁ red at maximum modulation capability for the duration of the delay setting. The amount of modulation and each stage size depends

upon

unit size and the number of stages. See following chart.

9. Approximately two minutes after satisfying the thermostat, fan operation ceases.

OPTIONAL GAS CONTROLS

These units are available with optional gas controls which will give either multi-stage or modulating operation. The sequence of operation of those units equipped with these optional gas controls differs only at what rate each duct furnace’s main burners ignite and operate at, or the order of duct furnace ﬁ ring for those units equipped with two or three duct furnaces.

Two Stage Units: Two stages of heating; ﬁ rst stage is 50% of full rate, second stage is 100% of full rate. Main burner ignition is at ﬁ rst stage only.

— 17 —

Modulation Stage

Number Capabilities Size of Stages (% of full input) (% of full input)

2 25 - 50 50 3 16.5 - 33 33 4 25 -50 25 6 16.5 - 33 16.5

AIR HANDLING REQUIREMENTS

1/2" TO 3/4"

AND ADJUSTMENTS

Remove wooden shipping support from beneath blower housing of Blower Section (if applicable) to prevent possible unit damage or improper unit operation.

Static Pressure through the unit should never exceed

2.0" W.C. (0.50 kPa). Units operate at a temperature rise range of 20 to 90°F (11 to 50°C).

It is important that the blower motor and the blower wheel pulleys be in good alignment, with the motor and blower shafts parallel.

Belt tension must be adjusted to give approximately

/4" deﬂ ection of the belt when ﬁ nger pressure is applied to the middle of the belt (See Figure 17). Small changes in this tension may be necessary for optimum operation. Belts will stretch over a period of time, requiring an adjustment to this tension. See MAINTENANCE section for belt and pulley adjustments.

NOTICE: It is impor tant that the ﬁ nal temperature leaving the unit does not exceed 160° F (71°C). When ﬁ nal air throughput adjustments are being made, a check of the discharge air temperature should be made after unit has operated for 15 to 20 minutes.

A unit should never be allowed to cycle on the primary limit for a prolonged period of time. It is a safety control to prevent a ﬁ re. If cycling on the primary limit is noted, corrective measures should be taken immediately. Failure to do so could result in unit damage or a ﬁ re.

NOTICE: At initial unit installation, unit should be started momentarily to conﬁ rm proper blower wheel rotation as the unit will deliver some air with the blower wheel running backwards.

Two basic air control systems can be used to deliver conditioned air to the occupied space: intermittent or constant fan operation.

Intermittent Fan Operation: The unit employs an air control system which utilizes a fan time delay relay to operate the fan while in the heating mode. If equipped with cooling, the thermostat controls the fan through a relay when in the cooling mode. Refer to unit wiring diagram.

These units are set at the factory for the RPM required to meet the air volume (CFM) and external static pressure ordered. If the estimated exter nal static is incorrect, or changes were made to the duct system, the blower RPM may need to be changed.

Both the Standard and High CFM Blowers use motors which are equipped with adjustable pitch pulleys. After removing belt(s), loosen the pulley set screw and remo ve the key, turn adjustable half of a pulley clockwise to increase RPM, or counter-clockwise to decrease RPM. Insert key, tighten set screw and replace belt(s). Adjust belt tension to give 1/2" to 3/4" belt play when depressed.

Blower motor full load amps should never be exceeded. Improper unit operation or motor failure could result.

After changing blower RPM, conﬁ rm blower motor full load amps have not been exceeded. See motor data plate for maximum full load amps.

Figure 17

Constant Fan Operation: The unit can be wired to give

an air control system which constantly circulates air through the unit and occupied space with constant fan operation. Refer to unit wiring diagram.

NOTICE: Check blower belt tension. Proper belt tension is important to the long life of the belt and motor. Proper belt tension will allow the belt to be depressed 1/2" to 3/4".

— 18 —

LIGHTING Refer to Separated Combustion Indoor Duct Furnace Manual for all heating functions - general comments are as follows.

Meter Method of Checking Input Rate

1. Obtain the heating value of the gas from the local

utility or gas dealer. This should be in units of Btu/ft3 (MJ/m3).

Purge the gas line to the unit of air before attempting to light the pilot. Check for gas leaks.

Never use an open ﬂ ame to detect gas leaks. Explosive conditions may exist which could result in personal injury or death.

This unit is equipped with an intermittent ignition system. A lighting instruction label is attached to the unit. To set the intermittent ignition system into operation, proceed as follows:

1. Turn on the gas valve(s) main manual valve.

2. Turn on electrical power. The unit is now under thermostat control.

3. Set thermostat to highest level. This will initiate the sequence of operation detailed in the Gas Control System section. Check main burners for operation.

4. Set thermostat to lowest level. This will interrupt power to the ignition control and shut off gas. Conﬁ rm pilot and main burners have been extinguished.

5. Set the thermostat to the desired setting.

For complete unit shutdown, proceed as follows:

2. Determine the gas ﬂ ow rate as shown in the following example. EXAMPLE: Assume this unit has a input rate of 250,000 Btu/hr (73.2 kW) and the heating value of the gas is 1000 Btu/ft3 (37.3 MJ/m3).

Gas Flow = Rate = 4.17 ft3/min

3. Before determining the gas ﬂ ow rate to the unit, all other gas appliances connected to the same meter must be turned off.

4. Fire unit according to instructions.

5. After approximately 15 minutes of unit operation, determine volume of gas used in ﬁ ve minutes of unit operation. For the Example above the unit should use 4.17 ft3/min x 5 min or 20.8 ft3 (1.97 L/s x 5 min x 60 s/min = 591L) of gas. Minor input adjustments can be made by removing pressure regulator cap and turning regulator clockwise to increase input or counter clockwise to decrease input. Any appreciable adjustment in input rate should be made by reoriﬁ cing.

Method to Check Manifold Pressure

1. Close the manual valve of unit gas valve.

250,000 Btu/hr

1000 Btu/ft3 x 60 min/hr

1. Turn off the gas valve(s) main manual valve.

2. Set thermostat to lowest setting.

3. Shut off all electric power.

GAS INPUT ADJUSTMENT

When shipped from the factory, all units are equipped for the average heat content of the gas which is stamped on the unit rating plate.

Since the heat content of gas varies by locality, the input must be checked after installation of the unit. If the unit is overﬁ red it will shorten the life of the heat exchanger. Never exceed the input on the rating plate.

For an accurate input rate measurement, the following meter method should be used to determine unit input rate. If the meter method is not possible, a manifold pressure check should be made.

2. Install a 1/8" pipe connection in the tapped hole provided in the gas valve body near outlet of the valve.

3. Attach manometer to 1/8" pipe connection by means of a rubber hose.

4. Fire unit according to instructions and obser ve the pressure and conﬁ rm it matches the unit manifold pressure from the unit rating plate.

5. Small variations in the manifold pressure can be made by means of the gas valve pressure regulator. Remove pressure regulator cap and turn regulator clockwise to increase pressure or counter-clockwise to decrease pressure.

— 19 —

PILOT ADJUSTMENT

Disconnect wire from terminal marked MV at gas valve.

2. Provide call for heat.

3. Pilot adjustment is found on the gas valve. Remove pilot adjustment cap.

4. Adjust the pilot screw to provide properly sized ﬂ ame.

5. A proper pilot burner ﬂ ame is a soft steady ﬂ ame that envelopes 3/8 to 1/2" (9.5 to 12.7mm) of the ﬂ ame sense probe tip.

6. Replace the pilot adjustment cap.

Freezestat: (Optional) Located in either the return airstream, the supply airstream, or both, this control monitors temperatures with setpoints which are ﬁ eld adjustable. If the temperature does not exceed the setpoint, the control will cease unit operation.

V. START UP

Before starting the unit, use the “Installation Check Sheet” (located at the end of this manual) and read the Separated Combustion Indoor Duct Furnace Manual entirely in conjunction with the procedures outlined below to ensure that the unit is completely and properly installed and ready for start up.

7. Reconnect wire to terminal MV.

PRIMARY AIR SHUTTER ADJUSTMENT

After the unit has been in operation for at least 15 minutes, adjust the primary air ﬂ ow to the burners. Turn the friction-locked manually rotated air shutters clockwise to close, counter clockwise to open. For correct air adjustment, close the air shutter until yellow tips in the ﬂ ame appear. Then open the air shutter to the point just beyond the position where yellow tipping disappears.

CONTROLS (also see the Indoor Duct Furnace Manual): Primary Limit Control: The primary limit control is a

factory installed component surface mounted in the inlet airstream at the end of the heat exchanger. When the temperature reaches the limit setpoint, normally caused by insufﬁ cient air throughput, all gas is shutoff. The limit control has an automatic reset and once the unit has cooled, it will reset itself. This is a safety control and if cycling on the primary limit is noted, corrective action must be taken. See unit wir ing diagram for electrical location. This control must never be bypassed. Upon completion of unit installation, the primary limit must be checked for proper operation. This can be accomplished by removing power to the indoor air blower and a call for heat.

Clogged Filter Switch: (Optional) The clogged filter switch monitors the pressure differential across the air ﬁ lters. If this pressure differential becomes too great, the switch will alert of this condition. At this point the air ﬁ lters must either be cleaned or replaced. The switch will reset itself.

Firestat: (Optional) Located in either the return airstream, the supply airstream, or both, this control monitors temperatures with setpoints which are ﬁ eld adjustable. If the temperature exceeds the setpoint, the control will cease unit operation. To resume unit operation, a manual reset of this control is required.

It is the installer’s responsibility to check all safety controls! Check and test the operational functions of all safety devices supplied with this unit. Failure to do so could result in unsafe conditions and may result in death, serious injury or property damage.

1. Inspect all wiring connections; connections should be clean and tight. Trace circuits to insure that

actual wiring agrees with the “as wired” diagrams provided with the unit. Information in the wiring

diagram title block should match the data appearing on the unit nameplate.

2. Lubricate all electrical motors according to the manufacturer’s recommendations.

3. Verify that the system switch is in the OFF position.

4. Check unit supply voltage to ensure that it is within the utilization range.

5. Inspect the interior of the unit; remove any debris or tools which may be present.

Starting Unit in Heating Mode

1. Close the unit disconnect switch which provides power to the unit.

High voltage is present in some areas of the unit (primarily the main electrical cabinet) with the unit disconnect switch closed. Failure to exercise caution when working in the presence of energized electrical components may result in injury or death from electrical shock.

2. Set the thermostat/switching subbase as indicated below: a. position the heating system switch at either HEAT or AUTO; b. set the fan switch to AUTO.

3. Place the system switch in the ON position. With the thermostat calling for heat, unit operation is automatic.

— 20 —

Starting Unit in Cooling Mode

1. Close the unit disconnect switch which provides power to the unit.

Inspect the suspension and/or support system for the make-up air unit to ensure that all fasteners are tight and the unit is secure before working underneath the unit. Failuree to do so could result in property damage, personal injury, or death.

Gas tightness of the safety shutoff valves must be checked on at least an annual basis.

2. Set the thermostat/switching subbase as indicated below: a. position the cooling system switch at either COOL or AUTO; b. set the fan switch to AUTO.

3. Place the system switch in the ON position.

With the thermostat calling for cooling, unit operation is automatic.

Final Checkout

Run the unit sequentially through its stages of heating and cooling. Once proper unit operation is verified, perform these ﬁ nal steps:

1. Inspect unit for debris and/or misplaced tools and hardware.

2. Be sure all gas valves and controls are in the operating position if the unit will be operating immediately.

3. Cycle unit on all safety controls to verify proper unit operation.

4. Confirm proper operating control (thermostat or ductstat) operation by cycling unit.

5. Secure all exterior panels in place.

T o check gas tightness of the saf ety shut-off valves , turn off the manual valve upstream of the appliance combination control. Remo v e the 1/8" pipe plug on the inlet side of the combination control and connect a manometer to that tapping. Turn the manual valve on to apply pressure to the combination control. Note the pressure reading on the manometer, then turn the valv e off . A loss of pressure indicates a leak. If a leak is detected, use a soap solution to check all threaded connections. If no leak is found, combination control is faulty and must be replaced bef ore

putting appliance back in service. These units have been developed for indoor installation.

Maintenance is required and it is suggested that the following unit servicing and inspections be performed routinely. Also read in entirety and refer to the Separated Combustion Indoor Duct Furnace Manual for maintenance requirements.

Inspect area near unit to be sure that there is no combustible material located within the minimum clearance requirements (See Figure 11). Service panels provide easy access to the blower compartment and the electrical cabinet. To remove the service door from any of these compartments, refer to access panel removal section in beginning of this manual.

VI. MAINTENANCE

HAZARDOUS VOL TAGE!

DISCONNECT ALL ELECTRIC POWER INCLUDING REMOTE DISCONNECTS BEFORE SERVICING. Failure to disconnect power before servicing can cause severe personal injury or death.

It is the service technician’s responsibility to check all safety controls! Check and test the operational functions of all safety devices supplied with this unit. Failure to do so could result in unsafe conditions and may result in death, serious injury or property damage.

— 21 —

Under no circumstance should combustible material be located within the speciﬁ ed clearances. Failure to provide proper clearance could result in personal injury or property damage from ﬁ re.

1. Follow the instructions in the maintenance section of the of the Separated Combustion Indoor Duct Furnace manual for servicing the furnace section of the makeup air unit.

2. Inspect and service the b lo w er section of the system.

3. Inspect and check the operational functions of all safety devices equipped with y our unit to ensure that all devices are performing adequately.

HIGH LIMIT AND/OR SAFETY LIMIT MAINTENANCE

Single furnace units are equipped with a primar y high limit on the upstream side of the heat exchanger and a secondary high limit on the downstream side of the heat exchanger. Multiple furnace units are equipped with a primary high limit on each fur nace section and a secondary high limit on the downstream unit. The primary high limit is a disk type switch while the secondary high limit is a capillary switch. To service or replace high limit or safety limit:

1. Turn off the manual gas v alve and electrical power to the MS unit.

SEASONAL MAINTENANCE

The unit should be thoroughly checked before the start and at the end of each heating and cooling season.

A. Motors and belts should be inspected. B. Tighten belts if loose. C. Check and clean DX or Chilled Water coil twice y early ,

if unit is so equipped per manufacturer’s service manual. Chilled Water coil must be winterized at beginning of heating season (i.e. drain water from coil per manufacturer’s instructions).

2. T o access the high limits, remove the f our screws from the top of the raceway on each furnace section and swing the raceway down. The primary limit can be removed by remo ving the two screws holding the high limit bracket to the heat e xchanger and removing the bracket and limit assemb ly from the heat e xchanger. Note location of and remove wires from limit switch, then remove push nuts and springs holding limit switch to bracket. Re-assemble in reverse order making sure that parts are assembled so that spring pressure holds limit switch securely against bottom header plate of heat exchanger.

3. T o remov e the secondary high limit, remove the wires from the limit switch, remov e the screws and stand-off sleeves holding the limit s witch body to the mounting plate. Do not remove the screws holding the mounting plate to the heat exchanger . Slowly pulll the switch and capillary assembly out of the retaining tube, taking care to prev ent kinking the capillary tube. Re-assemble in rev erse order, careefully pushing the capillary tube into the retaining tube to prevent kinking the capillary tube.

4. Complete appropriate start-up procedure as given in the “Start-Up” section of this manual.

5. Check Burner Adjustment.

Check gas control valv es and pipe connection for leaks.

7. Check operation of auto gas valve.

D . Check air throughput at beginning of heating season

to confirm unit operation is within the specified temperature rise range.

E. At beginning of heating season clear Condensate

Drain Pan and P-trap of w ater if unit is equipped with DX or Chilled water coil. Clean out drain pan and ﬁ ll P-trap with a non-toxic glycol solution.

F. Evaporative cooler must be cleaned and maintained

per manufacturer’s instr uction frequently during the operating season.

G. Inspect Control Dampers during periodic maintenance.

Damper pivot points should be cleaned to ensure free damper operation.

H. Blower wheels should be checked periodically for dirt

build-up on blades. Clean as required.

FILTERS

The ﬁ lter section has been designed to incorporate (as standard) one-inch washable ﬁ lters. Other optional ﬁ lter types are also available: two-inch washable throwaw a ys; or one or two inch hi-efﬁ ciency 30% pleated ﬁ lters.

It is recommended that air ﬁ lters be changed or cleaned at least four times a year . More frequent attention to ﬁ lters is required if the air being handled by the unit is unusually dirty. Air ﬂ ow reduction, caused by the dirty air ﬁ lters, will increase the discharge air temperature and may cause unit cycling on the primary limit.

8. Check operation of safety devices.

9. Inspect and service blower section of system.

Filters (by others) should be serviced regularly and changed or washed when necessary to maintain the required air throughput. In a dusty environment, ﬁ lters may clog up in less than one month.

— 22 —

Standard CFM Blower Air Filter Size Requirements

Number of Filters Required Unit Input 16 x 20 (in) 20 x 20 (in)

100 MBH (29.3 kW) 4 150 MBH (44.0 kW) 4 200 MBH (58.6 kW) 4 250 MBH (73.2 kW) 4 300 MBH (87.9 kW) 4 2 350 MBH (102.6 kW) 4 2 400 MBH (117.2 kW) 6 500 MBH (146.5 kW) 4 600 MBM (175.8 kW) 4 2 700 MBM (205.1 kW) 4 2 800 MBH (234.4 kW) 6

High CFM Blower Air Filter Size Requirements

Number of Filters Required

Figure 18

STANDARD CFM BLOWER

HIGH CFM BLOWER

Unit Input 16 x 20 (in) 20 x 20 (in)

100 MBH (29.9 kW) 8 150 MBH (44.0 kW) 8 200 MBH (58.6 kW) 8 250 MBH (73.2 kW) 8 300 MBH (87.9 kW) 8 4 350 MBH (102.6 kW) 8 4 400 MBH (117.2 kW) 12 500 MBH (146.5 kW) 8 600 MBH (175.8 kW) 8 4 700 MBH (205.1 kW) 8 4 800 MBH (234.4 kW) 12 1,200 MBH (351.6kW) 12

AIR BLOWER

Belt Tension Adjustment Standard CFM Blower belt tension can be adjusted by loosening motor mounting bolts marked A (See Figure 18). To tighten belt, slide motor down motor mounting bracket and re-fasten motor to mounting bracket.

High CFM Blower belt(s) tension can be adjusted by ﬁ rst loosening motor mounting plate bolts marked A (See Figure 18). To tighten belt tension, turn belt tension adjustment screws marked B (See Figure 18) counterclockwise. To loosen belt tension, turn clockwise. Once belt tension has been adjusted, re-fasten motor mounting plate bolts.

— 23 —

KEY B PROJECTS TO PROVIDE A GRIP FOR REMOVING. DO NOT OPERATE SHEAVE WITH FLANGE PROJECTING

BEYOND THE HUB END.

D3881

Blower RPM Adjustment

To adjust blower RPM:

1. Loosen and remove belt(s).

2. Match driver pulley to one found in Figure 19.

3. Loosen set screw(s) marked A.

4. If driver pulley is equipped with external key, marked B, remove.

5. Adjust driver pulley pitch diameter for desired speed by opening (slower) or closing (faster) moving parts by half or full turns. Do not open sheave past point where ﬂ ange projects past the hub end.

6. If driver pulley is equipped with external key, marked B, replace.

7. Tighten set screw(s) marked A.

Figure 19

8. Replace and retension belt(s).

9. Realign drive if necessary.

— 24 —

VII. TR OUBLESHOOTING

For troubleshooting of the duct furnace, refer to the Separated Combustion Indoor Gas-Fired Duct Furnace Installation and Service Manual. F or Evaporative Cooler/Cooling Coil equipped units , refer to these speciﬁ c manuals for additional troubleshooting guides.

For additional troubleshooting, see following Troubleshooting Guide.

TROUBLESHOOTING GUIDE

AIR BLOWER

PROBLEM PROBABLE CAUSE SOLUTION

1. Noise Blower Wheel Hitting Scroll Side a. Blower Wheel not centered in blower housing.

b. Damaged blower housing. c. Damaged blower wheel. d. Shaft loose in blower bearing. e. Blower Wheel loose on shaft. f. Blower bearing loose in bearing support. Blower Wheel Hitting Cutoff a. Cutoff not secure in blower housing. b. Cutoff damaged. c. Cutoff improperly positioned. Drive a. Pulley not tight on shaft (motor and/or blower wheel). b. Belts too loose. Adjust for belt stretching after 48 hours of operation. c. Belts too tight. d. Belts wrong cross section. e. Belts not matched in length on multi-belt drive. f. Variable pitch pulleys not adjusted so each pulley has same pitch diameter (multi-belt drives). g. Misaligned pulleys. h. Belts worn. i. Motor or motor base loose. j. Belts oily or dirty. k. Improper drive selection. Bearing a. Defective bearing. b. Needs lubrication. c. Loose on bearing support. d. Loose on shaft. e. Seals misaligned. f. Foreign material in bearing. g. Worn bearing. h. Fretting corrosion between inner race and shaft. Shaft Seal Squeal a. Needs lubrication.

b. Misaligned.

— 25 —

PROBLEM PROBABLE CAUSE SOLUTION

1. Noise Blower Wheel a. Loose on shaft.

b. Defective blower wheel. Do not run blower. Contact manufacturer. c. Unbalanced. d. Worn as a result of contact with abrasive or corrosive material. Housing a. Foreign material in housing. b. Cutoff or other part loose (rattling during operation). Electrical a. Lead-in cable not secure. b. AC hum in motor or relay. c. Starting relay chatter. d. Noisy motor bearings. e. Single phasing a 3 phase motor. Shaft a. Bent. b. Undersized. May cause noise at blower wheel, bearings or pulley. c. If more than two bearings are on a shaft, they must be properly aligned. High Air Velocity a. Duct work too small for application. b. Blower selection too small for application. c. Registers or grilles too small for application. d. Cooling coil with insufﬁ cient face area for application. Obstruction in High Velocity Air Stream a. Dampers.

c. Grilles. d. Sharp elbows. e. Sudden expansion in duct work. f. Sudden contraction in duct work. g. Turning vanes. Pulsation or Surge a. Blower too large for application. b. Ducts vibrate at same frequency as blower pulsations. Rattles and/or Rumbles a. Vibrating duct work. b. Vibrating cabinet parts. c. Vibrating parts not isolated from building.

2. CFM Low - Blower a. Forward curved blower wheel installed backwards.

Insufﬁ cient Air Flow

c. Cutoff missing or improperly installed. d. Blower wheel RPM too low. Duct System a. Actual system is more restrictive than expected. b. Dampers closed. c. Registers closed. d. Leaks in supply duct.

may cause Rattle or Pure Tone Whistle

b. Blower operating backwards.

b. Registers.

— 26 —

PROBLEM PROBABLE CAUSE SOLUTION

2. CFM Low Filters Dirty or clogged.

Insufﬁ cient Air Flow

Obstructions in High Velocity Air Stream a. Obstruction near unit outlet. b. Sharp elbows near unit outlet. c. Improperly designed turning vanes. d. Projections, dampers or other obstructions in part of duct system where air velocity is high.

3. CFM High - System a. Oversized duct work.

Too Much Air Flow

c. Registers or grilles not installed. d. Filters not in place. e. System resistance lower than anticipated. Blower Blower RPM is too great.

4. Blower Does Not Operate Installation a. Incorrect electrical connection.

b. Wrong voltage. c. Blown fuse. Unit a. Broken belt(s). b. Loose pulleys. c. Power to unit is disconnected. d. Motor overload protector has broken circuit. e. Optional thermostats, ﬁ restats, freezestats may lockout blower operation if set incorrect.

Coil - DX or Chilled Water Dirty or clogged.

b. Access door open.

TROUBLESHOOTING GUIDE

ELECTRIC MOTORS

PROBLEM PROBABLE CAUSE SOLUTION

1. Motor Blown fuse or open circuit breaker. Replace fuse or reset circuit breaker.

Overload trip. Check and reset, if manual. Improper line connections. Check connections to unit wiring diagram. Improper current supply. Check to determine that power supply agrees with

Mechanical failure. Determine that motor and drive turn freely.

Motor overloaded. Reduce load or replace motor . With a 3 phase power source, one Check line for open phase.

Defective capacitor. Replace capacitor.

2. Motor Stalls Wrong application. Consult manufacturer.

Overloaded motor. Reduce load or replace motor. Low line voltage. Check across AC line and correct

phase may be open.

motor nameplate speciﬁ cations.

Check bearings.

if possible.

— 27 —

PROBLEM PROBABLE CAUSE SOLUTION

3. Motor runs and then Partial loss of line voltage. Check for loose connections.

dies down.

4. Motor does not Motor undersized for application. Replace with larger motor.

come up to speed.

Line wiring to motor is too small. Install larger line wiring.

5. Motor takes too long Excessive load. Replace with larger motor.

to accelerate.

6. Wrong Rotation (3 Phase) Improperly wired to AC line (wrong Check unit wiring diagram. Reverse any two line

7. Motor Overheats Motor overloaded. Replace with larger motor.

Motor ventilation clogged. Clean motor. Motor (3 phase) may have open phase. Check to insure that all connections are tight. Line voltage too high or too low. Check across AC line and correct if possible. Worn blower bearings. Replace blower bearings.

8. Motor Vibrates Motor mounting bolts loose. Tighten mounting bolts.

Driven equipment unbalanced. Balance driven equipment. Worn motor bearings. Replace motor. 3 phase Motor running on single phase. Check for open circuit and correct. Bent motor shaft. Replace motor.

9. Rapid Motor Bearing Excessive overhung load due to over Reduce belt tension.

Wear

Voltage too low at motor terminals. Check across AC line and correct if possible.

Loose connection. Check connections and tighten where necessary.

sequence of phases).

tensioned belt.

Determine adequacy of main power supply.

voltage connections.

TROUBLESHOOTING GUIDE

FAN ASSEMBLY

PROBLEM PROBABLE CAUSE SOLUTION

1. Short Belt Life Spin burns from belt slippage. Tension belt.

High ambient temperature. Use Gripnotch belts. Grease or oil on belts. Clean belts and pulleys. Worn pulleys. Replace pulleys. Belt Misalignment. Realign drive.

2. Belts turn over in grooves Damaged belt. Replace belt.

Excessive vibration. Tension belts. Replace belts if damaged. Worn pulleys. Replace pulleys. Pulley Misalignment. Realign drive.

3. Belt Squeal Excessive load. High starting load.Retension drive.

4. Belt Breakage Foreign material in drive. Provide drive guard.

Belts damaged during installation. Replace belts. Extreme Overload. Eliminate overload.

5. Excessive Vibration Damaged belt cord section. Replace belts.

Loose belts. Tension drive. Belts improperly tensioned. Tension drive with slack of each belt on the

same side of drive.

— 28 —

PROBLEM PROBABLE CAUSE SOLUTION

6. Belts mismatched Belts improperly tensioned, causing Replace belts and tension drive with slack of each

after service

Old belts and new belts used Replace with new belts.

Different brand name belts used Replace with a set of Machine Matched Belts.

Driver and driven shafts shifted Realign drive.

Belt cord section damaged during Replace belts and install properly.

7. Drive fails to adjust Fretting corrosion (drive allowed to Driver pulley must be disassembled,

more stretch of some belts than others. belt on the same side of the drive.

on same drive.

from parallel.

installation.

operate at one speed over a period cleaned and lubricated, then of time). reassembled.

TROUBLESHOOTING GUIDE

DX COOLING COIL

PROBLEM PROBABLE CAUSE SOLUTION

1. No or Insufﬁ cient Coil icing. a. Low liquid line pressure.*

Cooling

c. Low air ﬂ ow across coil. Air binding. Purge and charge system. Thermal expansion valve.** a. Bulb mounted at incorrect location. b. Bulb not secured properly. Insufﬁ cient air ﬂ ow. a. See air blower troubleshooting. b. Clogged coil. Air bypassing coil. Caulk safe off. Undersized system, demand Replace system.*

Too much outside air. Check outside air dampers. Refrigerant leak. Determine leak location and correct. Low liquid pressure. Determine cause and correct.*

2. Water in Conditioned Air Exceeding coil face velocity - 600 fpm. Reduce unit air ﬂ ow.

Drain pan p-trap clogged. Clean pan and p-trap. * Refer to condensing unit installation and service manual.

**Refer to thermal expansion valve installation instruction.

b. Thermal expansion valve.**

exceeding cooling system capacity.

— 29 —

TROUBLESHOOTING GUIDE

CHILLED WATER COOLING COIL

PROBLEM PROBABLE CAUSE SOLUTION

1. No or Insufﬁ cient Cooling Circulating pump failure. Repair or replace pump.*

Chilled water temperature Check chiller.*

Air binding (air in coil). Bleed coil. Insufﬁ cient chilled water ﬂ ow. a. Circulating pump capacity is inadequate.* b. System piping losses too great. Insufﬁ cient air ﬂ ow. a. See air blower troubleshooting. b. Clogged coil. Air bypassing coil. Caulk safe off. Undersized system, demand Replace system.*

Too much outside air. Check outside air dampers.

2. Water in Conditioned Air Exceeding coil face velocity - 600 fpm. Reduce unit air ﬂ ow.

Drain pan P-trap clogged. Clean pan and p-trap. *Refer to Manufacturer’s Installation and Service Manual.

not cool enough.

exceeding cooling system capacity.

VIII. REPLACEMENT PARTS

To order Replacement Parts, please provide the following information to your local representative:

• Model Number

• Serial Number

• Part description and Number as shown in

Replacement Parts Literature

Due to the many conﬁ gurations, options and voltage characteristics available on Make-Up Air Packaged Units, the information provided in this manual is somewhat general in context. Should user or service organization incur a problem, the nature of which is not herein, we urge you to contact the manufacturer.

IX. SERVICE NOTE

It would be of great assistance to us if you can provide If further assistance is required, please contact the manufacturer’s customer service department

the model and serial numbers and the wiring diagram

number, as well as the access type.

X. LIMITED WARRANTY

All components are warranted by the manufacturer to be free from defects in material and workmanship for period of one (1) year from the date of shipment from the manufacturing plant.

The manufacturer will repair or replace, at its option, any component which, upon inspection, it ﬁ nds to be defective, provided that the Make-Up Air Packaged Unit has been operated within its listed capacity, has been installed in accordance with all furnished instruction, has not been misused or subjected to neglect and has received reasonable and necessary maintenance. This warranty does not cover labor costs or other costs incurred in repairing, removing, installing, servicing or handling of parts or completed products.

This Warranty does not cover loss due to corrosion by chemicals precipitated in the air such as halogenated hydrocarbons. The manufacturer will in no event be liable for incidental or consequential damages of any kind whatsoever. Written permission is required prior to the return of defective components. All returns must be sent with all transportation charges prepaid to the plant designated in the written permission. This warranty is extended only to the original owner of the Make-Up Air Package Unit.

— 30 —

“FOR CANADIAN INSTALLATIONS ONLY”

The following instructions apply to Canadian installations in addition to installation and operating instruction:

1. Installation must conform with local building codes, or in absense of local codes, with current CSA B149.1, Installation Codes for Natural Gas Burning Appliances and Equipment, or CSA B149.2, Installation Codes for Propane Gas Burning Appliances and Equipment.

2. Any reference to U.S. standards or codes in these instructions are to be ignored and the applicable Canadian standards or codes applied.

3. Any references to deration at altitudes in excess of 2000 feet are to be ignored. When installed in Canada at altitudes of 2000 to 4500 feet, the duct furnaces must be oriﬁ ced to 90% of the normal altitude rating, and be so marked in accordance with the ETL certiﬁ cation.

4. Duct furnaces are designed certiﬁ ed to comply with CSA 2.6.

5. In Canada, installation is suitable in airplane hangars when acceptable to the enforcing authorities, and in public garages when installed in accordance with current CSA B149 Installation Codes for Gas Burning Appliances and Equipment.

6. All electrical connections must be in accordance with Canadian Electrical Code, P art 1, CSA Standard C22.1.

7. In Canada, the vent system must be adequately supported to prevent sagging; but in no case shall the supports be less than every 3 feet.

8. If using a metal vent system under positiv e gauge pressure in Canada, a slip ﬁ t vent connection must be secured b y a least two corrosiv e resistant scre ws , or other mechanical loc king means .

9. Canadian units require the following vent equivalent lengths; 5 feet minimum; 50 feet maximum.

10. The vent shall not terminate — a. Less than 6 f eet from a combustion air inlet of another appliance. b. Less than 3 feet from any other building opening or any gas service regulator. c. Directly above a gas utility meter or service regulator .

11. V ent terminal shall be located not less than one foot abo ve grade.

12. It is recommended that the heater and vent system be checked once a year by a qualiﬁ ed serviceman.

— 31 —

XI. DIMENSIONAL DATA — ARRANGEMENTS

Indoor Arrangement [IA] “A”

Capacities [CA] 50 - 80

Indoor Arrangement [IA] “A”

Capacities [CA] 12

Refer to page 33 for tabulated dimensions.

— 32 —

DIMENSIONAL DATA — ARRANGEMENTS

This tabulated dimensional data applies to all dimensional drawings.

***Capacity Gas Inlet (CA) A B C D G H J▲ L U V Dia.** NAT LP

10 32- 7/8 15- 9/16 16- 7/8 19- 3/8 30- 3/16 37-1/16 24 N/A N/A 4 1/2 1/2 (835) (395) (418) (492) (767) (640) (610) (102)

15 32- 7/8 18- 5/16 16- 7/8 19- 3/8 30- 3/16 37- 1/16 24 N/A N/A 4 1/2 1/2 (835) (465) (418) (492) (767) (640) (610) (102

20 43- 7/8 23- 13/16 21- 15/16 24- 7/8 41- 3/16 37- 7/16 35 N/A N/A 5 1/2 1/2 (1114) (605) (557) (632) (1046) (678) (889) (127)

25 43- 7/8 29- 5/16 21- 15/16 24- 7/8 41- 3/16 37- 7/16 35 N/A N/A 5 3/4 1/2 OR 3/4 (114) (745) (557) (632) (1046) (678) (889) (127)

30 54- 7/8 34- 13/16 27- 7/16 30-3/8 52- 3/16 36- 11/16 46 N/A N/A 6 3/4 1/2 OR 3/4 (1394) (884) (697) (772) (1326) (640) (1168) (152)

40 60- 3/8 45- 13/16 30- 3/16 33- 3/16 57- 11/16 36- 11/16 51- 1/2 N/A N/A 6 3/4 1/2 OR 3/4 (1534) (1164) (767) (841) (1465) (640) (1308) (152)

50 43- 7/8 29- 5/16 21- 15/16 24- 7/8 42- 1/16 37- 7/16 35 N/A N/A 5 3/4 1/2 OR 3/4 (114) (745) (557) (632) (1068) (678) (889) (127)

60 54- 7/8 34- 13/16 27- 7/16 30- 3/8 53- 1/16 36- 11/16 46 N/A N/A 6 3/4 1/2 OR 3/4 (1394) (884) (697) (772) (1348) (640) (1168) (152

70 54- 7/8 40-5/16 27- 7/16 30- 3/8 53- 1/16 36- 11/16 46 N/A N/A 6 3/4 1/2 OR 3/4 (1394) (1024) (697) (772) (1348) (640) (1168) (152

80 60- 3/8 45- 13/16 30- 3/16 33- 1/8 58- 9/16 36- 11/16 51- 1/2 181-1/4 177 6 3/4 1/2 OR 3/4 (1534) (1164) (767) (841) (1487) (932) (1308) (4604) (4495) (152)

12 60- 3/8 45- 13/16 30- 3/16 33- 1/8 58- 9/16 36- 11/16 51- 1/2 218-1/4 217 6 3/4 1/2 OR 3/4 (1534) (1164) (767) (841) (1487) (932) (1308) (5544) (5512) (152)

NOTES: Unless otherwise noted the end views and dimensional data shown in the drawings and table are applicable to Indoor Arrangement [IA]-B, D, G, K. Dimensions are in inches. Dimensions in parenthesis are in millimeters. J▲ Dimension is an outside dimension for the return air damper. *This is an outside damper dimension. **V = Flue Opening; the 4" to 5" reducer adaptor is to be ﬁ eld installed for unit capacities 10 & 15. The 5" to 6" increaser adaptor is supplied by the manufacturer for unit capacities 30, 35, 40, 60, 70, 80 & 12 (required for each furnace's ﬂ ue). ***Capacities 10 through 40 are ETL certﬁ ed.

Typical

Intake Air End View

(Not applicable to [IA]-A or D

See Evaporative Cooling Speciﬁ cations)

Typical

Discharge End View

— 33 —

DIMENSIONAL DATA — ARRANGEMENTS

Indoor Arrangement [IA] “B”

Capacities [CA] 10/40

(ships in one section)

Indoor Arrangement [IA] “B”

Capacities [CA] 50/80

(ships in two sections)

Refer to page 33 for tabulated dimensions.

— 34 —

DIMENSIONAL DATA — ARRANGEMENTS

Indoor Arrangement [IA] “D”

Capacities [CA] 10/40

(ships in one section)

Indoor Arrangement [IA] “D”

Capacities [CA] 50/80

(ships in two sections)

Refer to page 33 for tabulated dimensions.

— 35 —

DIMENSIONAL DATA — ARRANGEMENTS

Indoor Arrangement [IA] “G”

Capacities [CA] 20/40

(ships in one section)

Indoor Arrangement [IA] “G”

Capacities [CA] 50/12

(ships in two sections)

Refer to page 33 for tabulated dimensions.

— 36 —

DIMENSIONAL DATA — ARRANGEMENTS

Indoor Arrangement [IA] “K”

Capacities [CA] 10/40

(ships in one section)

Indoor Arrangement [IA] “K”

Capacities [CA] 50/80

(ships in two sections)

Refer to page 33 for tabulated dimensions.

— 37 —

XII. MOTOR ELECTRICAL DATA

Full Load Current In Amperes

1 - (115/1/60) 2 - (208/1/60) 3 - (230/1/60)

ODP

1/2 HP 7.2 8.6 4.6 4.6 3.7 2.8 3.8 4.3 2.3 2.3 3/4 HP 11.6 11.0 6.5 6.3 5.2 5.4 3.4 5.0 5.5 3.3 3.2

1 HP 13.0 13.4 8.6 8.5 6.6 6.8 6.5 6.7 4.3 4.3

1-1/2 HP 18.2 18.0 12.5 12.6 9.1 8.4 9.1 8.0 6.3 6.3

2 HP 21.0 23.0 17.6 17.6 11.3 11.5 10.5 8.1 8.8 8.8 3 HP 33.5 28.0 17.4 14.6 16.8 14.0 11.8 5 HP 23.5 21.0 23.0 19.1

7-1/2 HP 33.0 31.0 31.0 29.0

10 HP 38.0 15 HP

ODP

1/2 HP 2.3 2.0 1.8 1.7 2.2 2.5 1.8 2.0 1.1 1.0 0.9 1.0 3/4 HP 3.0 3.2 2.5 3.4 3.0 2.4 2.8 1.7 1.5 1.2 1.4

1 HP 3.4 3.7 3.1 3.1 3.4 3.4 3.0 3.1 1.7 1.7 1.5 1.5

1-1/2 HP 5.1 5.0 4.5 4.5 5.2 4.6 4.4 4.4 2.6 2.3 2.2 2.2

2 HP 6.2 5.8 6.0 6.0 5.8 5.8 3.0 2.9 2.9 3 HP 9.2 8.5 9.0 8.6 8.4 8.4 4.3 4.2 4.2 5 HP 12.8 11.8 12.0 11.8 6.0 5.9

7-1/2 HP 20.4 21.0 19.4 18.8 9.7 9.4

10 HP 26.0 27.0 25.0 25.0 12.5 12.5 15 HP 37.4 38.9 35.4 37.0 17.7 18.5

ODP

1/2 HP 0.8 0.8 3/4 HP 1.1 1.1

1 HP 1.3 1.7 1.2 1.2

1-1/2 HP 1.7 1.8 1.8

2 HP 2.3 2.4 3 HP 3.4 3.2 5 HP 5.3 5.3

7-1/2 HP 7.8 7.6

10 HP 10.0 9.6 15 HP 14.1 15.1

PEODP4PETE

4 - (208/3/60) 5 - (230/3/60) 6 - (460/3/60) 2

7 - (575/3/60) 2

PEODP4PETE

ODP

PEODP4PETE

Motor Type (MT) Legend:

ODP - Open Drip Proof

ODP

TE - Totally Enclosed PEODP - Premium Efﬁ ciency Open Drip Proof PETE - Premium Efﬁ ciency Totally Enclosed

PEODP4PETE

— 38 —

XIII. UNIT/SHIP WEIGHTS

Motor Shipping Weight (lbs) - Approximate

1 - (115/1/60) 2 - (208/1/60) 3 - (230/1/60)

ODP

1/2 HP 20 24 32 30 21 24 32 21 24 32 30 3/4 HP 23 30 30 41 23 30 30 25 30 30 41

1 HP 32 32 40 44 32 32 32 32 40 44

1-1/2 HP 40 41 47 57 40 41 40 41 47 57

2 HP 42 67 65 64 50 67 42 48 65 64 3 HP 78 86 78 86 78 86 90 5 HP 87 87 99 95

7-1/2 HP 134 138 134 138

10 HP 165 140 161 15 HP

ODP

1/2 HP 19 18 22 22 19 18 22 22 19 18 22 22 3/4 HP 27 26 27 27 22 27 31 27 22 27 31

1 HP 24 26 36 37 24 26 36 37 24 26 36 37

1-1/2 HP 28 34 40 42 28 34 40 42 28 34 40 42

2 HP 35 46 49 35 46 49 35 46 49 3 HP 48 69 69 48 69 69 48 69 69 5 HP 76 77 76 77 76 77

7-1/2 HP 117 136 117 136 117 136

10 HP 128 158 128 158 128 158 15 HP 217 255 217 255 217 255

ODP

1/2 HP 22 18 3/4 HP 20 22

1 HP 28 26 33 38

1-1/2 HP 40 42

2 HP 46 48 3 HP 66 69 5 HP 74 91

7-1/2 HP 114 143

10 HP 145 153 15 HP 234 302

PEODP4PETE

4 - (208/3/60) 5 - (230/3/60) 6 - (460/3/60) 2

7 - (575/3/60) 2

PEODP4PETE

ODP

PEODP4PETE

Motor Type (MT) Legend:

ODP - Open Drip Proof

ODP

TE - Totally Enclosed PEODP - Premium Efﬁ ciency Open Drip Proof PETE - Premium Efﬁ ciency Totally Enclosed

PEODP4PETE

Cooling Coil Weight Adder (Approximate)

DX COIL

(CA) Capacity 4 Row 6 Row 10, 15 97 lbs. 132 lbs. 20, 25, 50 126 lbs. 177 lbs. 30, 35, 60, 70 165 lbs. 229 lbs. 40, 80 177 lbs. 249 lbs.

CHILLED WA TER COIL

(CA) Capacity 4 Row 6 Row 10, 15 75 lbs. 102 lbs. 20, 25, 50 98 lbs. 135 lbs. 30, 35, 60, 70 125 lbs. 176 lbs. 40, 80 135 lbs. 196 lbs.

Indoor Arrangement [IA] "A, B, D, G, K"

Shipping Weights (lbs.)

Outside

Air Hood

w/Bird Screen

Weight Adder

Capacity [CA]

Arrangement [IA]

ABDGK

10 742 904 1137 43

15 739 956 1188 43

20 916 1102 1206 1394 51

25 957 1114 1249 1436 51

30 1092 1301 1452 1659 59

35 1143 1352 1495 1702 59

40 1222 1443 1583 1799 63

50 550 1423 1595 1689 1915 51

60 650 1616 1812 1951 2195 59

70 800 1707 1902 2033 2278 59

80 850 1833 1240 2166 2420 63

12 1300 2741 63

Note: The approximate shipping weights are for a basic unit (these

weights do not include the motor, cooling coil, optional outside air

hood, ﬂ ex connector kit, or any options).

For units with double wall construction add an additional 10% of

the base unit weight.

— 39 —

XIV. COIL CABINET DIMENSIONAL DATA

INSIDE UNIT WALL

“ L” MAX.

31-3/4"

(806)

26" (660)

OUTSIDE BOTTOM PANEL

(25)

24"

(700)

33"

(838)

39"

(991)

(76)

13"(330)

MAX. COIL

DEPTH

7/8" (22)

TOP

53-1/4" (1353)

“ L” INSIDE MAX.

CABINET OPENING

42-1/4" (1073)

58-3/4" (1492)

31-1/4" (794)

30/35/60/70

UNIT SIZE

20/25/50

40/80

10/15

Maximum Coil Dimensions

Side Opening

of Coil Module

— 40 —

SEPARATED COMBUSTION

INDOOR MAKE-UP AIR PRODUCTS

MODEL “MS” SUBMITTAL INDEX

IA “B”

CA (10/40)

IA “D”

CA (10/40)

IA “G”

CA (10/40)

IA “K”

CA (10/40)

Single Furnace Units

(ETL Certiﬁ ed)

Unit Type (UT): MS

Submittal

Number

MS-40-B

MS-40-D

MS-40-G

MS-40-K

IA “A”

CA (50/80)

IA “B”

CA (50/80)

IA “D”

CA (50/80)

IA “G”

CA (50/80)

IA “K”

CA (50/80)

Dual Furnace Units*

Unit Type (UT): MS

Submittal

Number

MS-80-A

MS-80-B

MS-80-D

MS-80-G

MS-80-K

IA = Indoor Arrangement (Digit #7) CA= Capacity (Digits #3 and 4) Refer to Complete Model Number Designation

in Catalog.

Legend:

B/F/D = Standard Blower/Filter/Damper Module B = Hi CFM Blower Module F/D = Hi CFM Filter/Damper Module CC = Cooling Coil Module EV = Evap. Cooler Module

*Flex connector kits not shown.

IA “A”

CA (12)

IA “G”

CA (12)

Triple Furnace Units*

Unit Type (UT): MS

Submittal

Number

MS-12-A

MS-12-G

— 41 —

XVI. UNIT NUMBER DESCRIPTION

SEP ARA TED COMB USTION INDOOR MAKE-UP AIR UNITS

Digit M X X — 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 + Item Preﬁ x UT CA FT FM IA CO GT GC SV MT MS AI AC AS

(Internal use Only)

1, 2 - Unit Type [UT]

MS - Separated Combustion Indoor Make-up Air Unit

3, 4 - Capacity [CA]

*Single Furnace Double Furnace 10 - 100,000 BTU/HR 50 - 500,000 BTU/HR. 15 - 150,000 BTU/HR 60 - 600,000 BTU/HR 20 - 200,000 BTU/HR 70 - 700,000 BTU/HR 25 - 250,000 BTU/HR 80 - 800,000 BTU/HR 30 - 300,000 BTU/HR 35 - 350,000 BTU/HR Triple Furnace 40 - 400,000 BTU/HR 12 - 1,200,000 BTU/HR

*Single furnace capacities 10 through 40 are ETL certiﬁ ed.

5 - Furnace Type [FT]

A - Standard Temperature Rise (20-60°F), Right Side Access B - Standard Temperature Rise (20-60°F), Left Side Access C - High Temperature Rise (60-90°F), Right Side Access D - High Temperature Rise (60-90°F), Left Side Access 0 - None Z - Other

6 - Furnace Construction Material [FM]

1 - Aluminized Steel

- 409 Stainless Steel (First Furnace Only)

- 409 Stainless Steel (All Furnace Sections)

- 321 Stainless Steel (First Furnace Only)

- 321 Stainless Steel (All Furnace Sections)

- 409 Stainless Steel Package (First Furnace Only)

- 409 Stainless Steel Package (All Furnace Sections)

- 321 Stainless Steel Package (First Furnace Only)

- 321 Stainless Steel Package (All Furnace Sections)

- None

- Other

7 - Indoor Arrangement (includes furnace section(s) [IA]

A - Duct Furnace (50-12 [CA] only) K - Blower (High CFM) / Cooling

- Blower (Standard) 0 - None

B D - Blower (Standard) / Evap. Z - Other

- Blower (High CFM)

8 - Coil Options [CO]

A - DX Coil, 4 Row Single Circuit

- DX Coil, 4 Row Dual Circuit G - Chilled Water Coil, 6 Row

- DX Coil, 6 Row Single Circuit 0 - None

C D - DX Coil, 6 Row Dual Circuit Z

9 - Gas Type [GT]

1 - Natural Gas

- LP Gas (Propane)

- Natural Gas w/100% Shutoff

3 0 - None

10 - Gas Control [GC]

A - Single Stage Gas (Standard) B - Two Stage Gas H - Electronic Modulation w/Room Sensing

Electronic Modulation w/Duct Sensing

J K - Electronic Modulation w/Duct Sensing & Ovrd. Stat

Electronic Modulation w/External 4-20 mA Input (Furnace One)

L M

- Electronic Modulation w/External 4-20 mA Input (All Furnaces) N - Electronic Modulation w/External 0-10 VDC Input (Furnace One) P - Electronic Modulation w/External 0-10 VDC Input (All Furnaces) R - Two Stage Remote Temperature Control w/Duct Sensor

Three Stage Remote Temperature Control w/Duct Sensor

- Four Stage Remote Temperature Control w/Duct Sensor

T U - S-350 2 Stage Modular Electronic Control System

- S-350 3 Stage Modular Electronic Control System

W X - S-350 4 Stage Modular Electronic Control System

- S-350 6 Stage Modular Electronic Control System

- None

0 Z - Other

11 - Supply Voltage [SV]

1 - 115/1/60 5 - 230/3/60 2 - 208/1/60 6 - 460/3/60 3 - 230/1/60 7 - 575/3/60 4 - 208/3/60 0- None Z - Other

12 - Motor Type [MT]

1 - Open Drip Proof (Standard) 2 - T otally Enclosed 3 - Premium Efﬁ ciency, Open Drip Proof 4 - Premium Efﬁ ciency, Totally Enclosed 0 - None Z - Other

E - Chilled Water Coil, 4 Row

Other

13 - Motor Sizes [MS]

A - 1/2 HP. w/Contactor M - 1-1/2 HP. w/Mag. Starter 1 - 1 HP. VFD B - 3/4 HP. w/Contactor N - 2 HP. w/Mag. Starter 2 - 1-1/2 HP. VFD C - 1 HP. w/Contactor P - 3 HP. w/Mag. Starter 3 - 2 HP. VFD D - 1-1/2 HP. w/Contactor R - 5 HP. w/Mag. Starter 4 - 3 HP. VFD E - 2 HP. w/Contactor S - 7-1/2 HP. w/Mag. Starter 5 - 5 HP. VFD G - 3 HP. w/Contactor T - 10 HP. w/Mag. Starter 6 - 7-1/2 HP. VFD H - 5 HP. w/Contactor U - 15 HP. w/Mag. Starter 7 - 10 HP. VFD J - 1/2 HP. w/Mag. Starter 0 - None 8 - 15 HP. VFD K - 3/4 HP. w/Mag. Starter Z - Other L - 1 HP. w/Mag. Starter

14 - Air Inlet Conﬁ guration [AI]

1 - Outside Air (OA) 4 - Outside Air and Return Air (OA/RA) 2 - Outside Air w/Air Hood* 5 - Outside and Return Air w/Air Hood* 3 - Return Air (RA) 0 - None Z - Other

15 - Air Control & Damper Arrangement [AC]

A - Outside Air 2 Pos. Motor / Spring Return B

- Return Air 2 Pos. Motor / Spring Return

C - OA/RA 2 Pos. / Spring Return D

- OA/RA Mod. Mtr. w/Mixed Air Control / Min. Pot.

- OA/RA Mod. Mtr. w/Mixed Air Control / Min. Pot. / SR

E G - OA/RA Mod. Mtr. w/Mixed Air Control H

- OA/RA Mod. Mtr. w/Mixed Air Control / SR

OA/RA Mod. Mtr. w/Min. Pot.

J K - OA/RA Mod. Mtr. w/Min. Pot. / SR

- OA/RA Mod. Mtr. w/Dry Bulb / Mixed Air Control / Min. Pot.

L M

- OA/RA Mod. Mtr. w/Dry Bulb / Mixed Air Control / Min. Pot. / SR

N - OA/RA Mod. Mtr. w/Enthalpy Controlled Economizer / SR

- OA/RA Mod. Mtr. w/Pressure Control (Space Pressure)

- OA/RA Mod. Mtr. w/Carbon Dioxide (CO2) R/A Monitor

- OA/RA Mod. Mtr. w/S-350-P Proportional Mixed Air Control / SR

- OA/RA Mod. Mtr. w/0-10 VDC & 4-20 mA Analog Input (External Input)

- OA/RA Mod. Mtr. w/0-10 VDC & 4-20 mA Analog Input / SR (External Input)

T U - ASHRAE Cycle I (OA/RA 2 Pos. Mtr. w/Warm-up Stat / SR) W

- ASHRAE Cycle II (OA/RA Mod. Mtr. w/Warm-up Stat / Mixed Air / Min. Pot. / SR) X - ASHRAE Cycle III (OA/RA Mod. Mtr. w/Warm-up Stat / Mixed Air / SR) Y - Manual Dampers 0 - None MOD = Modulating Damper Motor Z - Other OA = Outside Air RA = Return Air SR = Spring Return

16 - Accessories [AS]

A1 - Moisture Eliminators H1 - Return Firestat A2 - Horizontal Return H2 A3 - Low Leak Damper H3 A6 - High Altitude Unit H4 A7 - High Pressure Regulator A8 - Unit Derate J1 J2 B1 - Filters - 1" WA (Standard) J3 B2 - Filters - 2" W B3 - Filters - 2" TA B4 - Filters - 1" 30% K1 - Manual Reset High Limit Switch† B5 - Filters - 2" 30% K2 - High / Low Gas Pressure Limit Switches K3 - Status Lamp (Elec. Cabinet) C1 - Evap. Cooler - Fill & Drain Kit K4 - Fan Time Delay (Arrangement “A” Only) C2 - Evap. Cooler - 12" CELdek C3 - Evap. Cooler - Freezestat w/o Time Delay L1 C4 - Evap. Cooler - 8" GLASdek C5 - Evap. Cooler - 12" GLASdek L4 D1 - Time Clock - 7 Day† D2 - Time Clock - 24 Hour† M2 M3 E1 - Clogged Filter Switch M4 E2 - G.F.I. Convenience Outlet 115VAC† M5 E3 - Remote Control Panel† E4 - Manual Blower Switch†

F1 - Ductstat - One Stage†

Ductstat - Two Stage† R1 - Field Installed VFD

F2 R2 -

Thermostat - T87K w/Subbase† R3 - VFD Remote Keypad for use w/R1†

G1 -

Thermostat - T87K w/Subbase & Guard

G2 -

Thermostat - T834N w/Subbase (Sterling Stat)

G3 -

Thermostat - TB8220U - 7 Day Programmable

G4 -

Thermostat - TH5220D (Two Stage)† R7 - 2-Speed VFD Relays

G5 -

Locking Thermostat Cover† R8 - 3-Speed VFD Relays

G6 -

Note: All thermostats are Mercury free 0

Z1- Ot

† = Field Installed

J4 - Interlock Relay - 24V Coil 4PDT 10A

Media K5 - Air Flow Prove Switch (Dwyer 1910-0)†

Media L2 - 30 Amp, Non-fused Disconnect Switch†

Media L3 - 60 Amp, Fused Disconnect Switch†

Supply Firestat Freezestat w/Time Delay Ambient Lockout

Interlock Relay - 24V Coil DPDT 10A, Plug-in Interlock Relay - 24/115V Coil SPDT 10A

Interlock Relay - 24/115/230V Coil DPDT 10A

30 Amp, Fused Disconnect Switch†

60 Amp, Non-fuse Disconnect Switch†

Vent Caps† Adaptor(s) (4"-5" inches)† Vertical Concentric Vent Kit† Horizontal Concentric Vent Kit†

N5 - Service Convenience Package N6 - Double Wall Construction

Factory Installed VFD

† R4 - CO2 Sensor - 100% OA†

† R5 - CO2 Sensor - Mixed Air†

† R6 - Pressure Sensor†

None

her (Specify)

*Single furnace capacities 10 through 40 are ETL certiﬁ ed.

— 42 —

NOTES:

— 43 —

XVII. GAS EQUIPMENT START-UP

Customer ____________________________________ Job Name & Number _________________________

PRE-INSPECTION INFORMATION

With power and gas off.

Type of Equip:

Serial Number _________________________ Model Number __________________________ Name Plate Voltage: _____________ Name Plate Amperage: _____________ Type of Gas: Natural LP Tank Capacity ______ lbs. Rating: ______ BTU @ ____ °F

______ kg ______ kw @ ____ °C

Unit Heater Duct Furnace Indoor

❐ Are all panels, doors, vent caps in place? ❐ Has the unit suffered any external damage? Damage ______________________________ ❐ Does the gas piping and electric wiring appear to be installed in a professional manner? ❐ Has the gas and electric been inspected by the local authority having jurisdiction? ❐ Is the gas supply properly sized for the equipment? ❐ Were the installation instructions followed when the equipment was installed? ❐ Have all ﬁ eld installed controls been installed? ❐ Do you understand all the controls on this equipment? If not, contact your wholesaler or rep.

(DO NOT START this equipment unless you fully understand the controls.)

GENERAL

With power and gas off.

❐ Make certain all packing has been removed. ❐ Tighten all electrical terminals and connections. ❐ Check damper linkages for tightness. ❐ Check all fans & blowers for free movement. ❐ Check all controls for proper settings. ❐ Check all set screws on blowers and bearings. ❐ Check belt tightness.

BLOWER

With power on and gas off.

❐ Check voltage L1 _____ L2 _____ L3 _____ ❐ Check rotation of main blower. ❐ Check motor amps L1 _____ L2 _____ L3 _____ ❐ Blower RPM _____________ ❐ Check air ﬁ lters. (Record quantity & size.)

GAS HEATING

With power and gas on.

❐ Inlet gas pressure. ____ in. W.C. or ____ kPa

❐ Pilot & main burner ignition. ❐ Manifold gas pressure. ____ in. W.C. or ____ kPa ❐ Cycle on HIGH LIMIT. ❐ Cycle ﬁ restat and/or freezestat. ❐ Check electronic modulation. Set at: __________ ❐ Cycle and check all other controls not listed. ❐ Check operation of remote panel. ❐ Entering air temp. _____ °F or ____ °C ❐ Discharge air temp. (high ﬁ re) ____ °F. or ____ °C ❐ External static pressure ____ in. W.C. or ____ kPa ❐ Cycle by thermostat or operating control. ❐ Combustion reading: Carbon monoxide: _____ PPM

Carbon dioxide: _____ %

— 44 —

Sterling MS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual