2
Bodily injury can result from
high voltage electrical components, fast moving fan drives
and combustible gas. For protection from these inherent
hazards during installation and servicing, the electrical
supply must be disconnected and the main gas valve must
be turned off. If operating checks must be performed with
the unit operating, it is the technician’s pesponsibility to
recognize these hazards and proceed safely.
Inspection
1. Check for damage after unit is unloaded.
Report promptly, to the carrier, any damage
found to unit. Do not drop unit.
2. Check unit nameplate to determine if unit is
correct for application intended. Power supply
must be adequate for the unit and all accesso-
ries.
3. Check to be sure the refrigerant charge has
been retained during shipment. Access to 1/4"
flare pressure taps may be gained by remov-
ing compressor compartment access panel.
Read this manual carefully before attempting to install,
operate or perform maintenance on this unit. Installation
and maintenance must be performed by qualified service
technicians except where noted.
IMPORTANT: This unit, as shipped from the factory, is
designed to use natural gas only.
Do not connect gas
piping to the unit until a line pressure test has been
completed. Pressure in excess of 34.8 mbar (14 inches
water column (1/2 PSIG)) will damage to the gas valve
resulting in an unsafe condition.
All power legs to the electrical
components may not be broken by contactors. See the
wiring diagram on the unit control box cover.
Note: “Warnings” and “Cautions” appear at appropriate
places in this manual. Your personal safety and the proper
operation of this machine require that you follow them
carefully. The manufacturer assumes no liability for
installations or servicing performed by unqualified person-
nel.
Table of Contents
Subject.......................................... Page
Subject.......................................... Page
GENERAL INFORMATION ................... 2
Power Wiring......................................
12
Module Names.....................................
3
Control Wiring.....................................
17
Unit Features........................................
3
Interconnecting Diagrams ................. 19
Test Mode Procedures...................
4 & 5
Pre-Start Check List............................ 21
Dimensional Data...........................
6 & 7
OPERATION
INSTALLATION
Power-up Initialization......................... 21
Location & Recommendations............... 8
Start-up in Heat Mode......................... 21
Attaching Ductwork............................... 9
Start-up in Cooling Mode....................
23
Condensate Drain Piping...................... 9
Manifold Pressure .............................. 22
Gas Piping........................................... 10
Operating Pressures........................... 23
Gas Pressure Set-up..........................
10
Evaporator Defrost.............................
23
Filter Installation.................................. 16
Final Installation Checklist................... 24
Evaporator Fan Adjustment................
16
MAINTENANCE ................................ 24
Electrical Connections ....................... 16
