McQuay IM 987
3
Introduction
Introduction
This manual provides general information about the “C”
vintage McQuay RoofPak applied rooftop unit, models RDS
and RAH. In addition to an overall description of the unit, it
includes mechanical and electrical installation procedures,
commissioning procedures, sequence of operation information,
and maintenance instructions. For further information on the
optional forced draft gas-fired furnace, refer to Bulletin No.
IM 684 or IM 685.
The MicroTech III applied rooftop unit controller is available.
For a detailed description of the MicroTech III components,
input/output configurations, field wiring and information on
using and programming the MicroTech III unit controller, refer
to OM 920.
For a description of operation and information on using the
keypad to view data and set parameters, refer to the
appropriate program-specific operation manual (see
Table 1
).
Gas Burner Nameplate
On units that include gas heat, the nameplate is located on the
lower right corner of the main control box door. It includes the
burner model number, minimum/maximum input, maximum
temperature rise, and minimum cfm.
Hazard Identification Information
Figure 1: Nomenclature
Table 1: Program Specific Rooftop Unit Literature
Rooftop unit control configuration
Operation manual
number
VFDs
McQuay 208 - 460 V
OM 844-1
McQuay 575 V
OM 895
Non-McQuay
See vendor manuals
DANGER
Dangers indicate a hazardous situation which will result in
death or serious injury if not avoided.
WARNING
Warnings indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or death if
not avoided.
CAUTION
Cautions indicate potentially hazardous situations, which can
result in personal injury or equipment damage if not avoided.
RAH – 047 C S E
RoofPak
Unit Size
RDS 800 = 4000 – 16,000 CFM
RDS 802 = 8000 – 20,000 CFM
RAH 047 = 12,000 – 30,000 CFM
RAH 077 = 23,000 – 50,000 CFM
Heat medium
A = Natural gas
E = Electric
F = Fuel oil
S = Steam
W = Hot water
Y = None
Design vintage
Cooling coil size
S = Standard (low airflow)
L = Large (high airflow)
Y = None or contractor coil
