882108-YIM-B-1012
8 Johnson Controls Unitary Products

REFERENCE

Additional information is available in the following reference
form:
• 246837 - Technical Guide

APPROVALS

Designed certified by CSA, ETL, CETL as follows:
1. For use as a forced air furnace with cooling unit (gas
heat models).
2. For outdoor installation only.
3. For installation on combustible material and may be
installed directly on combustible flooring or Class A,
Class B or Class C roof covering materials.
4. For use with natural gas (convertible to LP with kit).
Not suitable for use with conventional venting systems.
INSTALLATION

PRECEDING INSTALLATION

If a factory option convenience outlet is installed, the weath-
erproof outlet cover must be field installed. The cover shall be
located in the unit control box. To install the cover, remove
the shipping label covering the convenience outlet, follow the
instructions on the back of the weatherproof cover box, and
attach the cover to the unit using the (4) screws provided.

LIMITATIONS

The installation of this unit must conform to local building
codes, or in the absence of local codes, with ANSI Z223.1
Natural Fuel Gas Code and /or CAN/CGA B149 installation
codes.
In U.S.A.:
1. National Electrical Code ANSI/NFPA No. 70-Latest Edi-
tion.
2. National Fuel Gas Code Z223.1-Latest Edition.
3. Gas-Fired Central Furnace Standard ANSI Z21.47-Lat-
est Edition.
4. Local gas utility requirements.
Refer to Table 1 for Cooling and Electrical Application Data
and to Table 2 for Gas Heat Application Data.
After installation, gas fired units must be adjusted to obtain a
temperature rise within the range specified on the unit rating
plate.
If components are to be added to a unit to meet local codes,
they are to be installed at the contractor's and/or the cus-
tomer's expense.
Size of unit for proposed installation should be based on heat
loss / heat gain calculation made according to the methods of
the Air Conditioning Contractors of America (ACCA).

LOCATION

Use the following guidelines to select a suitable location for
these units:
1. Unit is designed for outdoor installation only.
2. Condenser coils must have an unlimited supply of air.
Where a choice of location is possible, position the unit
on either north or east side of building.
3. Suitable for roof mount on curb.
4. Roof structures must be able to support the weight of the
unit and its accessories. Unit must be installed on a solid
level roof curb or appropriate angle iron frame.
5. Maintain level tolerance to 3/4 inches across width and 2
inches along length.
208/230-3-60 and 380/415-3-50 units with factory
installed Powered Convenience Outlet Option are
wired for 230v and 415v power supply respectively.
Change tap on transformer for 208-3-60 or 380-3-50
operation. See unit wiring diagram.

TABLE 1: COOLING & ELECTRICAL APPLICATION

UNIT POWER
SUPPLY
VOLTAGE VARIATIONS
MIN. VOLTS MAX VOLTS
575-3-60 540 630
208/230-3-60 187 252
460-3-60 432 504

TABLE 2: COOLING & ELEC. APP. LIMITATIONS

LIMITATIONS MODEL
Z42 Z33 Z34
Supply Air CFM
(min./max) 6,000-
12,500 6,000-
15,000 8,000-
20,000
Entering Wet Bulb
Temp (F°) (min./max) 57/75 57/75 57/75
Ambient Temp 40/125 40/125 40/125
Min. Air Temperature on Gas Fired Heat Exchangers (°F)
Aluminized 25 25 25
Stainless 000